Near Infrared Distance Sensing Method for Chang E-3 Alpha Particle X-Ray Spectrometer
Alpha particle X-ray spectrometer (APXS) is one of the payloads of Chang E-3 lunar rover the scientific objective of which is in-situ observation and off-line analysis of lunar regolith and rock. Distance measurement is one of the important functions for APXS to perform effective detection
on the moon. The present paper will first give a brief introduction to APXS, and then analyze the specific requirements and constraints to realize distance measurement, at last present a new near infrared distance sensing algorithm by using the inflection point of response curve. The theoretical
analysis and the experiment results verify the feasibility of this algorithm. Although the theoretical analysis shows that this method is not sensitive to the operating temperature and reflectance of the lunar surface the solar infrared radiant intensity may make photosensor saturation. The
solutions are reducing the gain of device and avoiding direct exposure to sun light.
Keywords: Alpha particle X-ray spectrometer; Distance sensing; Inflection point; Near infrared
Document Type: Research Article
Publication date: 15 May 2013
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