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Applied Spectroscopy

Applied Spectroscopy


  • Vol. 52, Iss. 4 — Apr. 1, 1998
  • pp: 477–487

Prototype Raman Spectroscopic Sensor for in Situ Mineral Characterization on Planetary Surfaces

Alian Wang, Larry A. Haskin, and Enriqueta Cortez

Applied Spectroscopy, Vol. 52, Issue 4, pp. 477-487 (1998)

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Raman spectroscopy has the potential to provide definitive identification and detailed characterization of the minerals that comprise rocks and soils on planetary surfaces. We have designed a probe head for Raman spectroscopy that is suitable for use on a spectrometer deployed by a rover or a lander on the surface of a planet such as Mars, the Moon, or an asteroid. The probe head is lightweight, low power, rugged, and simple. It is based on a tiny distributed feedback diode laser and volume holographic components. A protective shell surrounds the probe head and serves as a mechanical stop for the mechanical arm of a planetary rover or lander during placement of the probe head onto the surface of a rock or soil. Pressing the shell against the rough surface of a target rock or soil also places the sampling objective of the probe head in rough focus, and the probe head is designed to be tolerant of focusing errors of 5 mm. A breadboard version of the probe head gave spectra of high quality on clean crystals of diamond, sulfur, calcite, quartz, and olivine. The results are qualitatively comparable to those obtained by using a conventional micro-Raman spectrometer on fine-grained travertine and on difficult specimens of basaltic lavas and impactites whose original mineralogy had been altered by reaction with water and air.

Alian Wang, Larry A. Haskin, and Enriqueta Cortez, "Prototype Raman Spectroscopic Sensor for in Situ Mineral Characterization on Planetary Surfaces," Appl. Spectrosc. 52, 477-487 (1998)

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