Simulated Lunar Surface Hydration Measurements Using Multispectral Lidar at 3 µm

Cremons, Daniel R.; Honniball, C. I.

doi:10.1029/2022ea002277

Cited by 1 publication

(1 citation statement)

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“…2024, 16, 1515 2 of 13 anomalously high reflectance regions at 1064 nm coincident with regions of permanent shadow that may indicate water ice exposures [6,[21][22][23], but the spatial resolution and precision of the LOLA reflectance measurements were limited partly due to the laser wavelength, which was primarily designed for altimetry measurements. Higher-precision and higher-resolution laser reflectance measurements at carefully selected laser wavelengths in the mid-infrared could quantify H 2 O/OH abundance at the tens of ppm level [24] but will require high signal-to-noise ratios (SNR) of both the transmitted and received laser energy measurements.…”

Section: Introductionmentioning

confidence: 99%

Speckle Noise Reduction via Linewidth Broadening for Planetary Laser Reflectance Spectrometers

Cremons,

Clarke,

Sun

2024

Remote Sensing

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The low obliquity of the Moon leads to challenging solar illumination conditions at the poles, especially for passive reflectance measurements aimed at determining the presence and extent of surface volatiles. A nascent alternate method is to use active laser illumination sources in either a multispectral or hyperspectral design. With a laser spectral source, however, the achievable reflectance precision may be limited by speckle noise resulting from the interference effects of a coherent beam interacting with a rough surface. Here, we have experimentally tested the use of laser linewidth broadening to reduce speckle noise and, thus, increase reflectance precision. We performed a series of speckle imaging tests with near-infrared laser sources of varying coherence, compared them to both theory and speckle pattern simulations, and measured the reflectance precision using calibrated targets. By increasing the laser linewidth, we observed a reduction in speckle contrast and the corresponding increase in reflectance precision, which was 80% of the theoretical improvement. Finally, we discuss methods of laser linewidth broadening and spectral resolution requirements for planetary laser reflectance spectrometers.

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Section: Introductionmentioning

confidence: 99%

Speckle Noise Reduction via Linewidth Broadening for Planetary Laser Reflectance Spectrometers

Cremons,

Clarke,

Sun

2024

Remote Sensing

Self Cite

View full text Add to dashboard Cite

show abstract

Simulated Lunar Surface Hydration Measurements Using Multispectral Lidar at 3 µm

Abstract: Hydration on the illuminated lunar surface has now been well established following remote observations of a 3 μm hydration band by five infrared spectrometers (

Cited by 1 publication

References 61 publications

Speckle Noise Reduction via Linewidth Broadening for Planetary Laser Reflectance Spectrometers

Speckle Noise Reduction via Linewidth Broadening for Planetary Laser Reflectance Spectrometers

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