[특허]Infrared gas analyser and humidity sensor

Infrared gas analyser and humidity sensor 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	G01N-021/61
출원번호	US-0221037 (1994-03-31)
우선권정보	NZ-0240154 (1991-10-08)
발명자 / 주소	Gradon Lewis (Auckland NZX) Clark Andrew B. (Auckland NZX) Seakins Paul J. (Auckland NZX)
출원인 / 주소	Fisher & Paykel Limited (Auckland NZX 03)
인용정보	피인용 횟수 : 59 인용 특허 : 0

초록 ▼

An infrared gas analyser. The analyser comprises a sample cell located in a gas flow, a source of infrared radiation of selected wavelengths which is propagated through the sample cell and an infrared detector which receives radiation which has passed through the cell, The radiation incident on the detector provides a measure of the concentration of selected substances in the gas flow due to one of the wavelengths being selected to be absorbed by the gas being measured. One preferred use is as a humidity sensor in a medical respiratory circuit where at least one selected wavelength is a wavelength strongly absorbed by water. Heating means am associated with the sample cell to vaporize any liquid water which may enter it and the cell is provided with internal baffles to reduce deposition or condensation of water on internal surfaces through which infrared radiation must pass. In one embodiment two selected wavelengths are derived from a single source with the second reference wavelength being a wavelength which is not significantly absorbed by the gas being measured and the source is switched between two power supplies to ensure the output of the detector is equal for the two wavelengths when the concentration of the measured gas is zero. In a second embodiment two single wavelength sources are used and their combined outputs passed through the sample cell.

대표청구항 ▼

An infrared gas analyser comprising a first source of infrared radiation of a first selected wavelength, the first selected wavelength being strongly absorbed by a selected gas to constitute a measurement wavelength, a second source on infrared radiation of a second selected wavelength, the second selected wavelength, the second selected wavelength selected so as to be minimally absorbed by said selected gas to constitute a reference wavelength, a gas sample cell through which radiation from both the first and second source is passed and through which said gas or gases pass in use, an infrared radiation detector adapted to detect radiation at said selected wavelengths, means defining a radiation path between said sources and said detector with said sample cell being positioned intermediately of said sources and said detector, a synchronous demodulator fed with the output of said detector and a synchronizing signal which converts the output signal from the infrared detector to a signal proportional to the concentration of the selected gas present in the gases passing through said sample cell, a first switched power supply for said first source of infrared radiation, a second switched power supply for said second source of infrared radiation and means for alternately switching the outputs of said first and second power supplies to energize alternately the respective first and second sources of infrared radiation, said switching being in phase with said synchronizing signal, means for setting the levels of the power supply outputs, said levels being predetermined to ensure the amplitude of the output signal from the infrared radiation detector remains constant when the concentration of said selected gas in said sample cell is zero, radiation combining means in said radiation path prior to said sample cell which combines radiation from said first source of infrared radiation with radiation from said second source of radiation, and said combining means is also a radiation splitting means which derives a further radiation path of combined radiation and including a second infrared radiation detector positioned in said further radiation path, a second synchronous demodulator fed with the output of said second infrared radiation detector and said synchronizing signal which produces a signal representative of the imbalance of radiation intensities generated by the first and second infrared radiation sources respectively, and means responsive to said imbalance signal which controls the outputs of both power supplies to keep the ratio of the radiation intensities from the first and second infrared radiation sources constant.

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IPC	Description
A	생활필수품
A62	인명구조; 소방(사다리 E06C)
A62B	인명구조용의 기구, 장치 또는 방법(특히 의료용에 사용되는 밸브 A61M 39/00; 특히 물에서 쓰이는 인명구조 장치 또는 방법 B63C 9/00; 잠수장비 B63C 11/00; 특히 항공기에 쓰는 것, 예. 낙하산, 투출좌석 B64D; 특히 광산에서 쓰이는 구조장치 E21F 11/00)
A62B-1/08	.. 윈치 또는 풀리에 제동기구가 있는 것

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Infrared gas analyser and humidity sensor 원문보기

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