Gas absorption spectrometer, control program, and control method

A non-transitory computer readable medium where a control program is stored, the control program being to be executed by a computer that is for use in a gas absorption spectrometer that analyzes a sample,

• the gas absorption spectrometer comprising:
• a resonator for storing the sample;
• a light source for outputting laser light to the resonator;
• a modulator disposed in an optical path between the light source and the resonator for modulating a frequency of the laser light;
• a first photodetector for detecting light leaking from the resonator;
• a second photodetector for detecting light reflected by the resonator and returned to the light source side;
• and
• a piezoelectric element for changing a cavity length of the resonator,
• the control program causing the computer to execute:
• a step of, based on the light detected by the second photodetector, controlling at least one of the modulator and the piezoelectric element to bring light in the resonator into a resonant state;
• and
• a step of, after changing the light in the resonator from the resonant state to a non-resonant state, measuring a target component in the sample based on the light detected by the first photodetector.

A control method for use in a gas absorption spectrometer that analyzes a sample,

• the gas absorption spectrometer comprising:
• a resonator for storing the sample;
• a light source for outputting laser light to the resonator;
• a modulator disposed in an optical path between the light source and the resonator for modulating a frequency of the laser light;
• a first photodetector for detecting light leaking from the resonator;
• a second photodetector for detecting light reflected by the resonator and returned to the light source side;
• and
• a piezoelectric element for changing a cavity length of the resonator,
• the control method comprising, as a process caused to be executed by a computer:
• a step of, based on the light detected by the second photodetector, controlling at least one of the modulator and the piezoelectric element to bring light in the resonator into a resonant state;
• and
• a step of, after changing the light in the resonator from the resonant state to a non-resonant state, measuring a target component in the sample based on the light detected by the first photodetector.