Abstract

The Hadamard transform technique has been extended to include photoacoustic detection. The feasibility of Hadamard transform photoacoustic spectrometry in the visible spectral region has been demonstrated. Depth profiling has been illustrated in a layered sample consisting of a thin (20 μm) surface layer of neodymium oxide dispersed in a polystyrene matrix on a thick (2.5 mm) interior layer of holmium oxide dispersed in a polystyrene matrix. Depth profiling may be accomplished by varying the modulation frequency or by phase-sensitive detection at the appropriate modulation frequency.

Denoising analysis of Hadamard transform spectrometry

Jiang Yue, Jing Han, Yi Zhang, and Lian-Fa Bai
Opt. Lett. 39(13) 3744-3747 (2014)

Photoacoustic imaging using the Hadamard transform technique

H. Coufal, U. Moller, and S. Schneider
Appl. Opt. 21(1) 116-120 (1982)

Hadamard-Transform Spectrometry of the Atmospheres of Earth and Jupiter

Perry G. Phillips and Daniel A. Briotta
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Comments on: Fourier Transform vs Hadamard Transform Spectrometry

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David C. Tilotta, Robert M. Hammaker, and William G. Fateley
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