Developing a THz subharmonic-spectrometer for lunar water analysis

The design of a THz subharmonic-spectrometer typically involves the use of a frequency multiplier chain to generate the desired THz frequency range. The spectrometer would also require a highly sensitive detector capable of measuring the small changes in the THz signal caused by the presence of water molecules. One possible approach to detect water on the moon is to use a THz subharmonic-spectrometer on board a lunar orbiter or lander. The spectrometer would scan the lunar surface and measure the THz signal, looking for any changes that may indicate the presence of water. The data collected by the spectrometer could then be used to create a map of the lunar surface and identify potential areas where water may be present. Our paper presents a novel approach to detect water on the moon using a 183GHz subharmonic-spectrometer. Our design incorporates a smooth-walled horn antenna to receive signals and an Arduino-based PLL multiplier frequency to generate local oscillator signals for subharmonic mixing. By utilizing this technology, we aim to improve the sensitivity and accuracy of water detection on the lunar surface.