Gas Absorption Spectroscopic Instrument
AssigneesShimadzu Corporation, National University Corporation Tokai National Higher Education and Research System
InventorsKazune MANO, Hideki TOMITA
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Abstract
The gas absorption spectroscopic instrument includes a light source, a first resonator, a photodetector, a controller, and a first frequency stabilization circuit. The first frequency stabilization circuit includes a second resonator, a frequency adjustment unit, and a lock unit. The frequency adjustment unit generates a laser beam with a main band and a laser beam with a subband. The lock unit locks the laser beam with the subband to the second resonator.
Claims7
A gas absorption spectroscopic instrument that measures a gas component, the gas absorption spectroscopic instrument comprising:
- a light source that outputs a laser beam for measuring the gas component;
- a first resonator into which the laser beam is input;
- a photodetector that detects a laser beam output from the first resonator;
- a controller that measures the gas component based on an output signal from the photodetector;
- and
- a first frequency stabilization circuit disposed between the light source and the first resonator to form a negative feedback circuit, wherein
- the first frequency stabilization circuit includes:
- a second resonator having a finesse lower than that of the first resonator;
- a frequency adjustment unit that adjusts a frequency of the laser beam;
- and
- a lock unit that locks the laser beam to the second resonator,
- the frequency adjustment unit generates a laser beam with a main band for measuring the gas component and a laser beam with a subband from the laser beam, and
- the lock unit locks the laser beam with the subband to the second resonator.
Dependencies are inferred from the claim text.