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Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

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September


Adaptive Noise Estimation from Highly Textured Hyperspectral Images

  • Peng Fu, Changyang Li, Yong Xia, Zexuan Ji, Quansen Sun, Weidong Cai, and David Feng
  • received 05/26/2014; accepted 09/07/2014; posted 09/09/2014; Doc. ID 212758
  • [full text: PDF (5422) KB)]
  • Abstract: Accurate approximation of noise in hyperspectral (HS) images plays an important role in better visualization and image processing. Conventional algorithms often hypothesize the noise type to be either pure additive or mixed noise type for signal-dependent (SD) noise component and signal independent (SI) noise component in HS images. It would result in application-driven algorithm design and limited use in different noise types. Moreover, as the highly textured HS images have abundant edges and textures, existing algorithms may fail to produce accurate noise estimation. In order to address these challenges, we propose a noise estimation algorithm which can adaptively estimate both pure additive noise and mixed noise in HS images with various complexities. Firstly, homogeneous areas are automatically detected using a new region growing based approach, where the similarity of two pixels is calculated by a robust spectral metric. Then, mixed noise variance of each homogeneous region is estimated based on multiple linear regression technology. Finally, intensities of the SD and SI noise are obtained with a modified scatter plot approach. The performance of our algorithm is quantitatively evaluated by experiments with the synthetic HS data. Compared with the benchmarking and state-of-the-art algorithms, the proposed algorithm is more accurate and robust when facing images with different complexities. Experimental results with the real Airborne Visible/Infrared Imaging Spectrometer (AVIRIS) images further demonstrate the superiority of our algorithm.

Keywords (OCIS):

  • (100.0100) Image processing : Image processing
  • (110.2960) Imaging systems : Image analysis
  • (100.4145) Image processing : Motion, hyperspectral image processing
  • (010.0280) Atmospheric and oceanic optics : Remote sensing and sensors

Superachromatic air-spaced triplet

  • Antonin Miks and Jiri Novak
  • received 07/24/2014; accepted 09/07/2014; posted 09/08/2014; Doc. ID 217603
  • [full text: PDF (414) KB)]
  • Abstract: A theoretical analysis of properties of superachromatic air-spaced triplets composed of thin lenses is described in this paper. It is shown an interesting result that the superachromatic air-spaced triplet cannot correct field curvature and transverse and longitudinal chromatic aberration simultaneously. The formulas for the calculation of parameters of an air-spaced triplet are derived and the procedure for the calculation of the shape of individual lenses of the triplet is described using the third-order aberration theory. The application of the described analysis is presented on an example of the design of the superachromatic triplet.

Keywords (OCIS):

  • (080.3620) Geometric optics : Lens system design
  • (080.3630) Geometric optics : Lenses
  • (220.2740) Optical design and fabrication : Geometric optical design
  • (220.3620) Optical design and fabrication : Lens system design
  • (220.3630) Optical design and fabrication : Lenses
  • (080.2468) Geometric optics : First-order optics

(LC2014) Polarization and visibility of higher order rainbows

  • Gunther Konnen
  • received 07/14/2014; accepted 09/07/2014; posted 09/08/2014; Doc. ID 216957
  • [full text: PDF (707) KB)]
  • Abstract: The degree of polarization of rainbows of order k with k ≥ 3 is bounded in the interval [75%, 78%], where 75% is the limit for k -> infinity . A polarization filter can improve the signal to background ratio of the 3rd and 4th rainbow by a factor 2, which may lift their visibilities in natural circumstances above the threshold of human visual perception. Under optimal circumstances, the latter may be true for the recently photographed green fingerprint of the 5th rainbow, even without the aid of a polarization filter. The prospects for observing the 6th rainbow are unclear. There exist a possibility that the signal of the natural 7th rainbow (appearing at 64° from the Sun) may be separated from its background if photographed under perfect conditions through a polarization filter.

Keywords (OCIS):

  • (010.1290) Atmospheric and oceanic optics : Atmospheric optics
  • (010.1310) Atmospheric and oceanic optics : Atmospheric scattering
  • (010.3920) Atmospheric and oceanic optics : Meteorology
  • (010.7295) Atmospheric and oceanic optics : Visibility and imaging

A diode-pumped acousto-optically cavity-dumped Tm:YAP laser at 1989 nm

  • Baoquan Yao, Hongwei Shi, Tongyu Dai, Zuochun Shen, Youlun Ju, Guoqing Cai, and Yuezhu Wang
  • received 07/08/2014; accepted 09/06/2014; posted 09/08/2014; Doc. ID 216524
  • [full text: PDF (483) KB)]
  • Abstract: In this paper, we demonstrated an diode-pumped acousto-optically cavity dumped Tm:YAP laser for the first time. The pulses were coupled out of the lateral surface of the cavity when Radio Frequency was added into the acousto-optically modulator. A maximum output power of 1.28 W was obtained with pump power of 40.3 W at a repetition rate of 200 KHz, corresponding to a slope efficiency of 4.7%. The output pulse width of the cavity dumped Tm:YAP laser was constant at 43 ns, and the wavelength was 1989.8 nm.

Keywords (OCIS):

  • (140.3480) Lasers and laser optics : Lasers, diode-pumped
  • (140.3580) Lasers and laser optics : Lasers, solid-state
  • (140.3538) Lasers and laser optics : Lasers, pulsed

Study of the multiwavelength DFB semiconductor laser array with asymmetric structures based on sampling technique

  • Yuechun Shi, Baoli Cao, Lianyan Li, Song Tang, Junshou Zheng, Peng Zhang, Ting Chen, and Shengchun Liu
  • received 06/10/2014; accepted 09/06/2014; posted 09/09/2014; Doc. ID 213723
  • [full text: PDF (927) KB)]
  • Abstract: Multiwavelength DFB semiconductor laser arrays (MLA) with asymmetric structures are studied in this paper. Thanks to the sampling technique, the asymmetric structures, including asymmetric phase shift and asymmetric coupling coefficient, can be achieved by the common holographic exposure. Therefore, the cost of fabrication is remarkably reduced. In addition, due to the large scale of sampling pattern, the wavelength precision of these kinds of MLAs can be simultaneously improved. As an example, we designed and fabricated an asymmetrically phase shifted MLA with 10 wavelengths for the first time. Comparing with the common phase shifted DFB laser, slope efficiency is significantly improved and single longitudinal mode (SLM) is still guaranteed. Besides, high wavelength precision is also obtained. The proposed MLA configurations may benefit multi-wavelength emitters for the future photonic integration a lot.

Keywords (OCIS):

  • (140.3490) Lasers and laser optics : Lasers, distributed-feedback
  • (140.5960) Lasers and laser optics : Semiconductor lasers

12.45-W wavelength-locked 878.6 nm laser diode in-band pumped multi-segmented Nd:YVO4 laser operating at 1342nm

  • Bin Li, Xin Ding, Bing Sun, Quan Sheng, Jian Liu, Zhang wei, Pengbo Jiang, Chen Fan, Haiyong Zhang, and Jianquan Yao
  • received 06/11/2014; accepted 09/06/2014; posted 09/09/2014; Doc. ID 213742
  • [full text: PDF (354) KB)]
  • Abstract: A wavelength-locked 878.6 nm diode laser in-band pumped multi-segmented Nd:YVO4 laser operating at 1342nm is reported here. The maximum output power of 12.45 W for the absorbed pump power of 35.6W while the incident pump power is 37W, leading to optical to optical efficiency of 34.9% and slope efficiency of 36.1%, the total optical to optical efficiency and slope efficiency for incident pump power are 33.6% and 34.8%, respectively. To the best of our knowledge, it is the highest efficiency of Nd:YVO4 lasers operating at 1342 nm with output power more than 10W.

Keywords (OCIS):

  • (140.0140) Lasers and laser optics : Lasers and laser optics
  • (140.3480) Lasers and laser optics : Lasers, diode-pumped
  • (140.3530) Lasers and laser optics : Lasers, neodymium

Time-domain algorithm for single-photon laser-Doppler flowmetry at large interoptode spacing in human bone

  • Tiziano Binzoni, Dimitri Van De Ville, and Bruno Sanguinetti
  • received 07/22/2014; accepted 09/06/2014; posted 09/10/2014; Doc. ID 217350
  • [full text: PDF (425) KB)]
  • Abstract: A new laser-Doppler flowmeter at large interopode spacing, based on single-photon counting (SP-LDF) and allowing to assess blood flow, deep in bone tissue, is proposed and implemented. To exploit the advantages of the new SP-LDF hardware, a dedicated simple and efficient time-domain algorithm, has been developed. The new algorithm is based on the zero-order moment of the power density spectrum of the `ad hoc' pre-filtered photo-electric current. The SP-LDF has been validated by Monte Carlo simulations, as well as by experimental measurements on a bone tissue phantom for optical flowmeters and on human.

Keywords (OCIS):

  • (170.1470) Medical optics and biotechnology : Blood or tissue constituent monitoring
  • (170.3340) Medical optics and biotechnology : Laser Doppler velocimetry
  • (170.3890) Medical optics and biotechnology : Medical optics instrumentation
  • (280.2490) Remote sensing and sensors : Flow diagnostics

Compass information extracting from polarization sensor using least-squares algorithm

  • Tao Ma, Xiaoping Hu, Junxiang Lian, and Lilian Zhang
  • received 05/16/2014; accepted 09/05/2014; posted 09/09/2014; Doc. ID 212298
  • [full text: PDF (1089) KB)]
  • Abstract: Skylight polarization provides a significant navigation cue for certain polarization-sensitive animals. We designed a polarization navigation sensor based on the polarization sensitivity mechanism of insects. In this paper, the principle of our polarization navigation sensor is introduced. The relationship between the degree of polarization (DOP) and the error of the angle of polarization (AOP) is examined. A new DOP and AOP calculation algorithm using a linear least-squares (LS) algorithm is presented. The results of simulation and experiments reveal the essentiality of DOP calculation and demonstrate the efficiency and accuracy of the proposed algorithm.

Keywords (OCIS):

  • (290.5820) Scattering : Scattering measurements
  • (290.5870) Scattering : Scattering, Rayleigh
  • (290.5855) Scattering : Scattering, polarization

Quantitative study of reflection of sunlight by a glass curtain wall resulting in a visual masking effect

  • Yinglei Ou
  • received 04/01/2014; accepted 09/05/2014; posted 09/09/2014; Doc. ID 209232
  • [full text: PDF (702) KB)]
  • Abstract: Because of the complexity of the shapes of the structures of buildings, the glass curtain walls of such buildings have different geometries; some of these glass curtain walls have high reflectivity and can strongly focus incident solar light. Under ideal conditions, the solar radiation flux incident onto the glass curtain wall and the solar flux reflected from the glass curtain wall can be theoretically determined. When exposed to an intense light source, human eyes exhibit a visual masking effect when processing an image; the resulting noise level and signal-to-noise ratio in the image are studied. Using field measurements to measure the reflected sunlight of two types of glass curtain walls, the energy distributions of the light reflected from these two different glass curtain walls are determined. This paper focuses on the analysis of the experimental results and the cause of the visual masking effect due to the reflection of sunlight from a glass curtain wall and on the method of the quantitative calculation of the visual masking effect.

Keywords (OCIS):

  • (000.2690) General : General physics
  • (300.6550) Spectroscopy : Spectroscopy, visible
  • (330.1070) Vision, color, and visual optics : Vision - acuity
  • (330.7320) Vision, color, and visual optics : Vision adaptation
  • (330.4595) Vision, color, and visual optics : Optical effects on vision

Contrast enhancements to petawatt lasers using short pulse optical parametric amplifiers and frequency doubling

  • David Hillier, Stephen Elsmere, Mark Girling, Nicholas Hopps, Dianne Hussey, Stefan Parker, Paul Treadwell, David Winter, and Thomas Bett
  • received 06/25/2014; accepted 09/05/2014; posted 09/05/2014; Doc. ID 213036
  • [full text: PDF (1523) KB)]
  • Abstract: This paper describes the integration of a short pulse optical parametric amplifier into the chirped pulse amplification beamlines of the Orion laser facility. This enables Orion to generate petawatt laser pulses at 1054 nm with a nanosecond contrast of >10^10. By combining this with frequency doubling post compression we can generate 100 J, 500 fs laser pulses with a nanosecond contrast calculated to be ~10^18.

Keywords (OCIS):

  • (140.3530) Lasers and laser optics : Lasers, neodymium
  • (190.4970) Nonlinear optics : Parametric oscillators and amplifiers
  • (140.3515) Lasers and laser optics : Lasers, frequency doubled

Radiation temperature measurement method for semi-transparent infrared optical materials

  • Tairan Fu, Jiangfan Liu, and Anzhou zong
  • received 03/31/2014; accepted 09/04/2014; posted 09/09/2014; Doc. ID 209205
  • [full text: PDF (680) KB)]
  • Abstract: Semi-transparent zinc sulfide (ZnS) crystal materials are widely used as the infrared-transmitting windows for optical instruments operating in the long wavelengths in harsh environments. This paper describes a temperature measurement method for high-temperature ZnS materials using the one-channel optical pyrometer based on a theoretical model of radiation transfer in semi-transparent plates. Numerical analyses of the radiation properties of ZnS plate are used to optimize the spectral band for the optical pyrometry. The optimized measurement spectral band is based on a trade-off between the measurement radiation intensity and the signal to noise ratio (SNR) for the ZnS material. The effective waveband emittance of one-dimension ZnS plate are analyzed for various experimental conditions (temperatures, thicknesses and direction angles) for the one-channel infrared pyrometer with the optimized measurement spectral response. The analysis can be used to improve radiation temperature measurements of semi-transparent ZnS materials in applications.

Keywords (OCIS):

  • (120.0120) Instrumentation, measurement, and metrology : Instrumentation, measurement, and metrology
  • (120.4290) Instrumentation, measurement, and metrology : Nondestructive testing
  • (120.6780) Instrumentation, measurement, and metrology : Temperature

Design of multichannel filters based on the use of periodic Cantor dielectric multilayers

  • Tzu-Chyangng King and Chien-Jang Wu
  • received 08/07/2014; accepted 09/04/2014; posted 09/04/2014; Doc. ID 220593
  • [full text: PDF (465) KB)]
  • Abstract: A fractal multilayer structure made of two dielectric materials can exhibit photonic bandgap (PBG). With the use of this PBG, in this work, we study the transmission properties of periodic triadic Cantor set (PTCS) structures. The results indicate that the structure can be used to design multichannel filters with channel number equal to N-1 for a given number of periods, N. In addition, the channel frequencies can be designed at will. The considered structure provides another new type of designing a tunable multichannel filter.

Keywords (OCIS):

  • (230.0230) Optical devices : Optical devices
  • (230.4170) Optical devices : Multilayers
  • (230.5298) Optical devices : Photonic crystals

4.0 μm, High Repetition Rate PPMgLN Midinfrared Optical Parametric Oscillator Pumped by Steep Leading Edge Pulsed Fiber Laser

  • Lu Wang, Qiang Liu, Encai Ji, Hailong Chen, and Mali Gong
  • received 05/09/2014; accepted 09/04/2014; posted 09/05/2014; Doc. ID 211697
  • [full text: PDF (995) KB)]
  • Abstract: A high repetition rate optical parametric oscillator (OPO) generating idler laser with the wavelength as long as 4.0 μm at 200 and 400 kHz was demonstrated in this paper. The OPO was pumped by a master oscillator power amplifier (MOPA) structure fiber laser with excellent characteristics. The pump pulse from the fiber laser had a steep leading edge, which was theoretically proved to improve the OPO’s performance, comparing with the Gaussian pump pulse. A homemade periodically poled magnesium-oxide-doped lithium niobate (PPMgLN) crystal with the grating period of 29 μm was employed in our experiment. By optimizing the resonator, 2.75 and 1.67 W idler lasers were finally achieved at the repetition rate as high as 200 kHz and 400 kHz respectively with the wavelength as long as 4.0 μm. The conversion efficiencies were 12.03% and 7.31% respectively.

Keywords (OCIS):

  • (190.4970) Nonlinear optics : Parametric oscillators and amplifiers
  • (140.3518) Lasers and laser optics : Lasers, frequency modulated
  • (190.4223) Nonlinear optics : Nonlinear wave mixing

3D Nanotub Submicron Diffraction Gratings for Solar Cells

  • Cyrus Ho, Josephine Mckeon, Daniel Macdonald, and Kylie Catchpole
  • received 06/25/2014; accepted 09/04/2014; posted 09/04/2014; Doc. ID 214555
  • [full text: PDF (646) KB)]
  • Abstract: Diffraction gratings are a promising approach for reducing reflection and achieving light-trapping in solar cells. Using a square lattices as a base structure; we investigate a novel bi-periodic ‘nanotub’ 3D grating structure and compare with established textured structures for thin film and wafer applications. For wafer application, simulations show that optimal AR coated nanotubs demonstrated solar weighted reflectance (SWR) of 2% compared to AR coated square pyramids with values 1.9%. Nanotubs also show SWR below 8% for polar angles to 60°. Simulated short circuit current thin film cells with nanotubs using smaller dimensions show higher yields (3-6 mA/cm2 average) compared to square pyramids. For periods greater than 700nm, nanotubs have reduced current, attributed to the increased planar surface area of the nanotub base, and evident in increased SWR. In experiments, AR coated nanotub wafers were produced through nanoimprint lithography with a SWR of 6.4%.

Keywords (OCIS):

  • (050.0050) Diffraction and gratings : Diffraction and gratings
  • (050.1950) Diffraction and gratings : Diffraction gratings
  • (310.0310) Thin films : Thin films
  • (310.1210) Thin films : Antireflection coatings
  • (220.4241) Optical design and fabrication : Nanostructure fabrication
  • (310.6628) Thin films : Subwavelength structures, nanostructures

Polarization-dependent elliptical crater morphologies formed on silicon surface by single-shot femtosecond laser ablation

  • Xu Ji, Lan Jiang, Xiaowei Li, Weina Han, Yang Liu, Qiang Huang, and Yongfeng Lu
  • received 06/27/2014; accepted 09/04/2014; posted 09/04/2014; Doc. ID 214602
  • [full text: PDF (3497) KB)]
  • Abstract: Formation of the elliptical-shaped craters on silicon surface is investigated comprehensively using single shot of a femtosecond laser. It is observed that the ablation craters are elongated along the major axis of the polarization direction while its orientation is parallel to the polarization direction. The ablation area grows and the morpholgies of the craters evolve from an ellipse to nearly a circle with the increasing of fluence. The underlying physical mechanism is revealed through numerical simulations which are based on the finite-difference time-domain technique. It is suggested that the initially formed craters lead to the redistribution of electric field on silicon surface, which plays a crucial role in the creation of the elliptical-shaped craters. And the field intensity becomes enhanced along the incident laser polarization direction, which determines the elliptical crater orientations.

Keywords (OCIS):

  • (140.3390) Lasers and laser optics : Laser materials processing
  • (140.7090) Lasers and laser optics : Ultrafast lasers
  • (160.6000) Materials : Semiconductor materials

High-precision rolling angle measurement for 3D collimator

  • Yang Gao, Xingshu Wang, Zongsheng Huang, Dejun Zhan, and Chunsheng Hu
  • received 07/02/2014; accepted 09/04/2014; posted 09/04/2014; Doc. ID 214603
  • [full text: PDF (1919) KB)]
  • Abstract: We propose a precise rolling angle measurement for collimator to extend its application in 3D angular deformations measurement, significantly superior to the traditional 2D performance. The rolling angle measurement is realized by taking full advantage of the point array image which is projected in terms of the collimated beam. The measurement error is estimated according to the valid proposed algorithm. The characteristics of the point array are analyzed to optimize the point array for precise measurement, including the point distribution, the point array resolution and the point array area. Both simulations and experiments demonstrated that sub-arcsecond precision rolling angle measurement was achieved by our method, which is superior to those attained by other targets proposed.

Keywords (OCIS):

  • (040.1520) Detectors : CCD, charge-coupled device
  • (150.6910) Machine vision : Three-dimensional sensing
  • (110.3925) Imaging systems : Metrics

Refractive index and geometrical thickness measurement of thin optical samples by a transmitted Gaussian beam

  • Octavio Olvera-R, Moises Cywiak, Joel Cervantes-L, and David Cywiak
  • received 08/11/2014; accepted 09/04/2014; posted 09/11/2014; Doc. ID 220750
  • [full text: PDF (406) KB)]
  • Abstract: We describe a technique for measuring simultaneously the local geometrical thickness and the refractive index of non- dispersive, semi-transparent thin plates by means of the diffractive properties of a transmitted Gaussian beam. The technique is based on measuring the semi-width of the transmitted beam and the shift of the Gaussian centroid caused by introducing a tilt on the sample under test. A homodyne technique is devised to accurately characterize the Gaussian beam. Our proposal does not require any prior information of the sample under study. We present analytical support of our technique and we give experimental results.

Keywords (OCIS):

  • (120.3940) Instrumentation, measurement, and metrology : Metrology
  • (160.2750) Materials : Glass and other amorphous materials
  • (160.4760) Materials : Optical properties
  • (070.7345) Fourier optics and signal processing : Wave propagation

Laser frequency locking with second-harmonic demodulation

  • Lishuang Feng, Haicheng Li, Junjie Wang, Yinzhou Zhi, Yichuang Tang, and Chenlong Li
  • received 07/25/2014; accepted 09/03/2014; posted 09/04/2014; Doc. ID 217739
  • [full text: PDF (530) KB)]
  • Abstract: An external-optical-cavity-based laser frequency locking method with second-harmonic demodulation was proposed, analyzed, and demonstrated. The second-harmonic component of the cavity output was demodulated to feed back to the frequency-locking loop, resulting in a high sensitivity, great carrier suppression, and large modulation bandwidth. The experimental demodulation curve was consistent with the simulation result. A DFB fiber laser was then locked using this technique. A carrier wave suppression ratio of -67 dB and a laser frequency noise floor of 1 Hz/√Hz level above 1 Hz were achieved. This technique has great potential to be used in resonator optic gyroscopes.

Keywords (OCIS):

  • (060.2800) Fiber optics and optical communications : Gyroscopes
  • (140.0140) Lasers and laser optics : Lasers and laser optics
  • (140.3425) Lasers and laser optics : Laser stabilization
  • (240.6380) Optics at surfaces : Spectroscopy, modulation

Improvement of infrared/ millimeter wave mirror array beam combiner by wavefront division imaging technique

  • Yi Tian, Gang Sun, Hui Yan, Li Zhang, and Zhuo Li
  • received 07/22/2014; accepted 09/02/2014; posted 09/08/2014; Doc. ID 217426
  • [full text: PDF (3240) KB)]
  • Abstract: In order to reduce the complexity of splicing the mirrors of an infrared (IR)/millimeter wave (MMW) beam combiner into a plane, wavefront division imaging technique (WDIT) was proposed. However, WDIT would lead to the difference of air gap thicknesses among different mirrors, which will further cause the non-uniformity of MMW field. Simultaneously, there were slots between every two mirrors after mirror array spliced and adjusted, which would also affect MMW and IR diffraction. Thus, the aperture field integration method (AFIM) was proposed to compute MMW near field distribution and IR far field distribution. The method was validated by comparing to the results obtained from multilevel fast multipole method (MLFMM) and experiment. The experiment results showed that the diffraction phenomenon caused by a tilt slot or a hole can approximate to that caused by a slot with the width or a hole with the edge diameter along the tilt direction multiplied by cosine of tilt angle. The variation of both MMW and IR field distribution caused by three factors: different tilt angles, thicknesses of air gap and widths of slot were analyzed by using AFIM in spatial domain and time domain. The simulation results showed that the three factors will affect the uniformity of MMW field. And the uniformity introduced by thicknesses of air gap was the worst. However, the uniformity still satisfied the requirement for phase error, when the variation of thicknesses of air gap was less than 1mm. Although the three factors would cause the loss of energy and enhancement of the background noise received by an IR focal plane array (FPA), the resolution of the IR system would not be affected. Thus, the WDIT was validated through above analysis.

Keywords (OCIS):

  • (260.0260) Physical optics : Physical optics
  • (260.1960) Physical optics : Diffraction theory
  • (350.4010) Other areas of optics : Microwaves

Signal subspace analysis for decoherent processes during interferometric fiber-optic gyroscopes using synchronous adaptive filters

  • Yongxiao Li, Zinan Wang, Chao Peng, and Zhengbin Li
  • received 05/01/2014; accepted 09/02/2014; posted 09/04/2014; Doc. ID 211217
  • [full text: PDF (1143) KB)]
  • Abstract: Conventional signal processing methods for improving the random walk coefficient and the bias stability of interferometric fiber-optic gyroscopes (IFOG) are usually implemented in one dimension sequence. In this paper, as a comparison, we allocated synchronous adaptive filters with the calculations of correlations of multi-dimensional signals in the perspective of the signal subspace. Firstly, two synchronous independent channels are obtained through quadrature demodulation. Next, synchronous adaptive filters were carried out in order to project the original channels to the high related error channels and the approximation channels. The error channel signals were then processed by principle component analysis (PCA) for suppressing coherent noises. Finally an optimal state estimation of these error channels and approximation channels based on the Kalman gain coefficient was operated. Experimental results shows that this signal processing method improved the measurement variance from 0.0630 (°/h)² to 0.0101 (°/h)².

Keywords (OCIS):

  • (060.2370) Fiber optics and optical communications : Fiber optics sensors
  • (060.2800) Fiber optics and optical communications : Gyroscopes
  • (120.0120) Instrumentation, measurement, and metrology : Instrumentation, measurement, and metrology
  • (200.3050) Optics in computing : Information processing

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