[특허]Method and apparatus for spectroscopic measurement of the concentration of a gas

Method and apparatus for spectroscopic measurement of the concentration of a gas 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	G01N-021/00 G01J-001/42
출원번호	US-0634126 (1991-03-05)
우선권정보	SE-0002536 (1988-07-07)
국제출원번호	PCT/SE89/00404 (1989-07-07)
§371/§102 date	19910305 (19910305)
국제공개번호	WO-9000732 (1990-01-25)
발명자 / 주소	Tell Robert (Gteborg SEX) Andersson Torbjrn (Gteborg SEX) Lundqvist Stefan (Askim SEX) Ahlberg Henrik (Gteborg SEX)
출원인 / 주소	Altoptronic AB (Gothenburg SEX 03)
인용정보	피인용 횟수 : 61 인용 특허 : 0

초록 ▼

Method and apparatus for spectroscopic measurement of the concentration of a gas in a sample where you detect the intensity of light from a light source (1) passed through the sample (4) and through a reference cell (5) and generates a signal which represents the concentration of the gas. A laser diode (1) constitutes the light source which is locked to the absorption line of the gas at known concentration and pressure contained in a reference cell (5). The laser light with the properly selected wavelength is distributed via optical fibres (2, 3, 6) and/or glass prisms (19, 20) to the reference cell (5) and the sample (4). Non-gas-related transmission variations in the measurement path or in the optics is automatically compensated for by a special laser modulation which generates a time multiplexed reference. The measurement can be performed in a measurement cell incorporating several reflective mirrors (30) to reflect the laser beam several times inside the measurement cell thereby increasing the effective length of the measurement path. The measurement can also be performed using an optical fiber designed so that the surrounding gas or fluid via the evanescent field affects the laser light so that the concentration of the substance in question in the surrrounding fluid or gas can be determined.

대표청구항 ▼

A spectroscopic method for measuring the concentration of a gas in a gas sample, the method comprising the steps of: intensity modulating a light of a laser diode and frequency modulating the light by a modulation signal to lock the modulated light to an absorption line of a gas within a reference cell of a predetermined pressure and concentration; passing the modulated light through the gas sample along a measurement path and through the reference cell; detecting intensity of the light passed through the gas sample and the reference cell and generating a measurement signal and a reference signal, respectively, representative thereof; automatically compensating the measurement signal for nongasrelated transmission variations in the measurement path by a first and second demodulating step, and first demodulating step comprising the steps of: forming a first difference signal between a monitoring signal representative of the modulated light and the measurement signal, forming a second difference signal between the monitoring signal and said reference signal, and automatically adjusting a first and second gain level of the measurement signal and the reference signal such that the first and second difference signals are equal to zero with respect to an amplitude of a fundamental frequency of the modulation signal, said second demodulating step comprising the steps of: detecting harmonics of the measurement signal and reference signal with respect to the fundamental frequency of the modulation signal; receiving the compensated and demodulated measurement signal and reference signal and generating a concentration signal which is indicative of the concentration of the gas in the gas sample.

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