Gas detector and leakage-gas detection system
AssigneesDaikin Industries, Ltd., Riken
InventorsTomoatsu Minamida, Tomoyuki Haikawa, Kazuyuki Satou, Satoshi Wada, Masaki Yumoto
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Abstract
A gas detector detects difluoromethane present in a remote target space. The gas detector includes a detection portion that detects the difluoromethane by using absorption of light of a predetermined wavelength. The predetermined wavelength is in a wavelength range of any of a first wavelength range of 1659 to 1673 nm, a second wavelength range of 1724 to 1726 nm, a third wavelength range of 2218 to 2221 nm, a fourth wavelength range of 2463 to 2466 nm, a fifth wavelength range of 3316 to 3318 nm, and a sixth wavelength range of 9034 to 9130 nm.
Claims16
A gas detector configured to detect difluoromethane present in a remote target space, the gas detector comprising:
- a detection portion configured to detect the difluoromethane by using absorption of light of a predetermined wavelength,
- the predetermined wavelength being in a wavelength range of any of
- a first wavelength range of 1659 to 1673 nm,
- a second wavelength range of 1724 to 1726 nm,
- a third wavelength range of 2218 to 2221 nm,
- a fourth wavelength range of 2463 to 2466 nm,
- a fifth wavelength range of 3316 to 3318 nm, and
- a sixth wavelength range of 9034 to 9130 nm.
A gas detector configured to detect difluoromethane present in a remote target space, the gas detector comprising:
- an emission portion configured to emit, with respect to the remote target space, first light in which a transmission wavelength is modulated by current modulation to include infrared light of a predetermined wavelength;
- a light reception portion configured to receive the first light that has passed through the remote target space;
- and
- a detection portion configured to detect the difluoromethane present in the remote target space based on the first light received by the light reception portion,
- the predetermined wavelength being in a wavelength range of any of
- a first wavelength range of 1659 to 1673 nm,
- a second wavelength range of 1724 to 1726 nm,
- a third wavelength range of 2218 to 2221 nm,
- a fourth wavelength range of 2463 to 2466 nm,
- a fifth wavelength range of 3316 to 3318 nm, and
- a sixth wavelength range of 9034 to 9130 nm, and
- the detection portion being configured to detect the difluoromethane present in the remote target space based on
- a fundamental-wave phase-sensitive detection signal of the predetermined wavelength of the first light, and
- a second-harmonic phase-sensitive detection signal of the predetermined wavelength of the first light or a fourth-harmonic phase-sensitive detection signal of the predetermined wavelength of the first light.
Dependencies are inferred from the claim text.