[특허]NDIR gas analysis using spectral ratioing technique

NDIR gas analysis using spectral ratioing technique 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	G01N-021/03
출원번호	US-0851869 (1992-03-16)
발명자 / 주소	Wong Jacob Y. (Santa Barbara CA)
출원인 / 주소	Gaztech International Corporation (Goleta CA 02)
인용정보	피인용 횟수 : 41 인용 특허 : 0

초록 ▼

An instrument for determining the concentration of a particular gas that might be present in a sample has no moving parts and is extremely compact and inexpensive. A novel waveguiding structure serves both as an optical element and as the sample chamber. As an optical element, the waveguiding structure collects radiation from a blackbody source located at the entrance end of the waveguiding structure and conducts the radiation through the waveguiding structure, concentrating it on two infrared detectors mounted at the opposite end of the waveguiding structure. As a sample chamber, the waveguiding structure causes the radiation to undergo multiple reflections that result in the average path length being substantially greater than the physical length of the waveguiding structure. Each of the detectors has its own optical filter, and baffling assures that each detector responds only to radiation which has passed through its filter. One filter defines a spectral passband that coincides with the infrared absorption band of the gas to be measured. The other filter defines a non-absorbing or neutral passband. The electrical signals produced by the detectors are processed to provide a ratio, the value of which is related to the concentration of the particular gas to be detected.

대표청구항 ▼

An instrument for determining the concentration of a particular gas that might be present in the air around the instrument based on the propensity of the particular gas to absorb radiation in a characteristic wavelength band in which air not containing the particular gas does not absorb radiation, said instrument comprising in combination: a tube having an open first end, having an open second end, having an inside surface that is specularly reflective for conducting radiation along said tube by multiple reflections, having a wall, and having at least one aperture extending through the wall; a membrane spanning said at least one aperture and permitting the particular gas to diffuse into said tube from the air around the instrument and out of said tube, while preventing unwanted particles from entering said tube; a source of radiation located within the first end of said tube; a first filter located within the second end of said tube and oriented to receive radiation that has passed through said tube, and transmitting only radiation in a spectral band that includes the characteristic wavelength band of the particular gas; a first detector located within the second end of said tube and positioned to receive only radiation that has passed through said first filter and responsive to that radiation to produce a first electrical signal representative of the intensity of that radiation; a second filter located within the second end of said tube and oriented to receive radiation that has passed through said tube, and transmitting only radiation in a spectral band that does not include the characteristic wavelength band of the particular gas; and a second detector located within the second end of said tube and positioned to receive only radiation that has passed through said second filter and responsive to that radiation to produce a second electrical signal representative of the intensity of that radiation.

이 특허를 인용한 특허 (41)

Wong, Jacob Y, Absorption biased NDIR gas sensing methodology.
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Han, Jae Min; Jeong, Do Young; Ko, Kwang Hoon; Kim, Taek Soo, Apparatus for detecting the leakage of heavy water in nuclear reactor system and detection method using the same.
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Kadwell, Brian J.; Pattok, Greg R., Compact particle sensor.
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Kadwell,Brian J.; Pattok,Greg R., Compact particle sensor.
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Tice Lee D., Detector with variable sample rate.
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Andrian I. Kouznetsov, Diffusion-type NDIR gas analyzer with improved response time due to convection flow.
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Kouznetsov Andrian, Diffusion-type NDIR gas analyzer with improved response time due to convection flow.
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Bytyn Wilfried,DEX ; Seefeld Peter,DEX ; Vaihinger Stefan,DEX, Gas analyzer.
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Bender Gerald M. ; Shawgo Loyal B., Gas concentration monitoring system.
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Stuttard, David Michael, Gas sensor.
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Yi,Seung Hwan; Park,Jeong Ik; Kang,Ji Hyun, Gas sensor.
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Mengel,Arthur H.; Gregory,Otto J.; Feick,M. Bradley; Flanders,David R., Gas sensor apparatus.
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Shulga, Aleksandr; Schmale, Udo; M?ller, Holger, Gas sensor arrangement.
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Levine Michael S., Holographic gas analyzer utilizing holographic optics.
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Wahlbrink Gunter,DEX, Infrared absorption measuring cell.
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Yamamori Shinji,JPX ; Dainobu Hidetoshi,JPX, Infrared detector and gas analyzer.
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Wong, Jacob Y, Intrinsically safe NDIR gas sensor in a can.
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Schell Michael B., Method for detecting venting of a combustion appliance within an improper space.
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Wong Jacob Y., Method for dynamically adjusting criteria for detecting fire through smoke concentration.
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Bonne Ulrich ; Cole Barrett E. ; Higashi Robert E., Micromachined integrated opto-flow gas/liquid sensor.
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Hong T. Sun ; Peter C. Hsi, Non-dispersive infrared gas sensor.
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Henderson, David Benjamin, Non-dispersive infrared sensor with a reflective diffuser.
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Kadwell, Brian J.; Stirling, Christopher D., Optical particle detectors.
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Arno, Jose I., Optical sensor system and method for detection of hydrides and acid gases.
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Russell,James T, Optical system for a gas measurement system.
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Kubo,Teruhiro; Oikawa,Yoichi, Polarization measuring apparatus.
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Weckstrom, Kurt P.; Huiku, Matti, Radiation source assembly and transducer for analyzing gases or other substances.
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Wong, Jacob Y., Re-calibration methodology for NDIR gas sensors.
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Carlson Lee Richard, Self normalizing radiant energy monitor and apparatus for gain independent material quantity measurements.
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Kadwell Brian J. ; Pattok Greg R., Smoke detector.
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Kadwell Brian J. ; Pattok Greg R., Smoke detector.
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Kadwell, Brian J.; Pattok, Greg R., Smoke detector.
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Marman, Douglas H.; Eggers, Frederick W., Smoke detector and method of detecting smoke.
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Waller Michael V. ; Arsenault Kenneth, Spectral analyzer.
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Sachse,Glen W.; Rana,Mauro, System and method for determining gas optical density changes in a non-linear measurement regime.
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Tice Lee D., System and method of adjusting smoothing.
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Tice Lee D., System and method of filtering.
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Wong,Jacob Y.; Tse,Chi Wai, Ultra low cost NDIR gas sensors.
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Baliga Shankar ; Rabe Herbert H., Ultraviolet toxic gas point detector.
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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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NDIR gas analysis using spectral ratioing technique 원문보기

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NDIR gas analysis using spectral ratioing technique 원문보기

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