ADORE- CRDS

The LUPEX mission, a joint project by JAXA and ISRO, aims to search for trace amounts of water at the lunar south pole. ADORE (Aquatic Detector using Optical REsonance) is an instrument designed to quantify trace water and analyze its isotopic composition in the lunar polar regions using the cavity ring-down method at a wavelength of 1.3 μm.

ADORE team member: PI: Chihiro YAMANAKA (Osaka Univ.), Ko Hashizume (Ibaraki Univ.), Hisashi Abe (AIST) ,

Akihiro Yabushita (Aichi Univ. Tech.), Masahiro Kamo (Takasago Thermal Eng.),

Toshihiro Somekawa (Institute for Laser Technology), Ryudo Tsukizaki (ISAS), Shoichiro Yokota (Osaka Univ.)

with support of JAXA staff and engineers at Chiyoda Co. etc.

Detection of WATER Molecules by Cavity Ringdown Spectroscopy

A palm-sized CRDS with the cavity length

of 5cm was developed.

Calibration curve for 1 mole of moisture in dry N2 gas. Moisture levels in the ppb range
(10 ppb = nmol/mol ≈ 0.1 ng/cell) are detectable. On the lunar surface, it measures the absorption of water vapor gas in the 2 kPa to 0.1 Pa range. Sens. Actuators A (2021) 112559

Calibration of water vapor with different D/H ratio. Results demonstrate the capability to analyze samples with δD values close to -1000, such as OH (including HHO) generated by the reaction between solar wind protons (deuterium-depleted) and lunar surface oxides.

Sens. Actuators A-Phys., 338, 113481, 2022.

セクションタイトル

Absorption spectrum acquisition screen