Enhanced cavity for a photoacoustic gas sensor
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
G01N-021/01
G01N-023/10
출원번호
US-0827873
(2010-06-30)
등록번호
US-8322191
(2012-12-04)
발명자
/ 주소
Fritz, Bernard
출원인 / 주소
Honeywell International Inc.
대리인 / 주소
Seager Tufte & Wickhem LLC
인용정보
피인용 횟수 :
1인용 특허 :
134
초록▼
Photoacoustic cells for gas sensors are described. In some instances, the photoacoustic cell may be configured to provide an increased internal path length of the light beam in the photoacoustic cell relative to, for example, a conventional cylindrical photoacoustic cell. The photoacoustic cell may
Photoacoustic cells for gas sensors are described. In some instances, the photoacoustic cell may be configured to provide an increased internal path length of the light beam in the photoacoustic cell relative to, for example, a conventional cylindrical photoacoustic cell. The photoacoustic cell may be shaped to provide increased internal reflection of the light within the photoacoustic cell, thereby increasing the absorption of the light by a gas to be detected in the photoacoustic cell. One example photoacoustic cell that can provide such increased internal reflection may be a generally conical-shaped.
대표청구항▼
1. A photoacoustic gas sensor comprising: an electromagnetic radiation source configured to emit electromagnetic radiation;a photoacoustic cell configured to receive a gas sample to be detected, wherein the photoacoustic cell includes an optical element adjacent the photoacoustic cell and configured
1. A photoacoustic gas sensor comprising: an electromagnetic radiation source configured to emit electromagnetic radiation;a photoacoustic cell configured to receive a gas sample to be detected, wherein the photoacoustic cell includes an optical element adjacent the photoacoustic cell and configured to transmit at least part of the electromagnetic radiation into the photoacoustic cell, wherein the photoacoustic cell includes a front wall, a reflective back wall, and reflective side walls extending between the front wall and the back wall to collectively define an optical cavity, wherein the optical element is positioned adjacent the front wall and opposite the back wall, wherein the cross-sectional area defined by the side walls increases from the front wall toward the back wall, and wherein the electromagnetic radiation transmitted into the photoacoustic cell first reflects off the reflective back wall of the photoacoustic cell; andan acoustical detector acoustically coupled to the photoacoustic cell, the acoustical detector configured to detect an acoustic signal that is related to absorption of the electromagnetic radiation by the gas sample in the photoacoustic cell. 2. The photoacoustic gas sensor of claim 1, wherein the optical element is configured to only transmit a band of wavelengths corresponding to an absorption line of a gas to be detected. 3. The photoacoustic gas sensor of claim 1, wherein the electromagnetic radiation emitted by the electromagnetic radiation source has a wavelength corresponding to an absorption line of the gas to be detected. 4. The photoacoustic gas sensor of claim 1, wherein the optical cavity of the photoacoustic cell is shaped to increase an optical path length of the electromagnetic radiation internal to the photoacoustic cell. 5. The photoacoustic gas sensor of claim 1, wherein at least one of the side walls is at a non-orthogonal angle relative to the back wall. 6. The photoacoustic gas sensor of claim 1, wherein the back wall is non-parallel with the optical element. 7. The photoacoustic gas sensor of claim 1, wherein at least one of the back wall and side walls is curved. 8. The photoacoustic gas sensor of claim 1, wherein the photoacoustic cell is conical in shape. 9. The photoacoustic gas sensor of claim 1, wherein the photoacoustic gas sensor is generally free from optical elements positioned between the electromagnetic radiation source and the optical element of the photoacoustic cell. 10. A photoacoustic gas sensor comprising: an electromagnetic radiation source configured to emit electromagnetic radiation;a photoacoustic cell configured to receive a gas sample to be detected, wherein the photoacoustic cell includes an optical element adjacent the photoacoustic cell and configured to transmit at least part of the electromagnetic radiation into the photoacoustic cell, wherein the photoacoustic cell includes a front wall, a reflective back wall, and reflective side walls extending between the front wall and the back wall to collectively define an optical cavity, wherein the optical element is positioned adjacent the front wall and opposite the back wall, and wherein the cross-sectional area defined by the side walls increases from the front wall toward the back wall;an acoustical detector acoustically coupled to the photoacoustic cell, the acoustical detector configured to detect an acoustic signal that is related to absorption of the electromagnetic radiation by the gas sample in the photoacoustic cell;wherein the optical element includes a rear side facing toward the back wall of the photoacoustic cell;wherein the rear side of the optical element reflects electromagnetic radiation when an incident angle of the electromagnetic radiation is greater than a threshold angle, and transmits electromagnetic radiation when the incident angle is less than the threshold angle; andwherein the photoacoustic cell is shaped such that at least a majority of the electromagnetic radiation that is transmitted through the optical element and into the cavity of the photoacoustic cell has an incident angle that is greater than the threshold angle for at least a first time that the electromagnetic radiation returns to the rear side of the optical element. 11. A photoacoustic gas sensor comprising: an electromagnetic radiation source configured to emit electromagnetic radiation;a photoacoustic cell configured to receive a gas sample to be detected, wherein the photoacoustic cell includes an optical element adjacent the photoacoustic cell that is configured to transmit at least part of the electromagnetic radiation into the photoacoustic cell, wherein the photoacoustic cell includes a front wall, a reflective back wall, and reflective side walls extending between the front wall and the back wall to collectively define an optical cavity, wherein the optical element is positioned adjacent to and/or forms at least part of the front wall, and wherein the cross-sectional area defined by the side walls increases monotonically from the front wall toward the back wall; andan acoustical detector acoustically coupled to the photoacoustic cell, the acoustical detector configured to detect an acoustic signal that is related to absorption of the electromagnetic radiation by the gas sample in the photoacoustic cell. 12. The photoacoustic gas sensor of claim 11, wherein at least one of the side walls is at a non-orthogonal angle relative to the back wall. 13. The photoacoustic gas sensor of claim 11, wherein at least one of the back wall and side walls is curved.
연구과제 타임라인
LOADING...
LOADING...
LOADING...
LOADING...
LOADING...
이 특허에 인용된 특허 (134)
Yanka Robert W. (Liverpool NY) Noble Milton L. (Liverpool NY), A-dual band IR sensor having two monolithically integrated staring detector arrays for simultaneous, coincident image re.
Wei X. Yang ; Thomas E. Nohava ; Scott A. McPherson ; Robert C. Torreano ; Subash Krishnankutty ; Holly A. Marsh, Back-illuminated heterojunction photodiode.
Kachanov, Alexander; Koulikov, Serguei; Richman, Bruce A., Cavity enhanced optical spectroscopy with a cavity having a predetermined deviation from a mode degeneracy condition.
Thorland Rodney H. ; Sittler Daniel L. ; Carlson David W. ; Altmann Gerald R., Device and method for achieving beam path alignment of an optical cavity.
Chang-Hasnain Constance J. (837 Allardice Way Stanford CA 94309) Vail Edward C. (117 Cowper St. Palo Alto CA 94305) Wu Marianne S. (P.O. Box 10233 Stanford CA 94309), Electrostatically-controlled cantilever apparatus for continuous tuning of the resonance wavelength of a fabry-perot cav.
Hara, Hitosh; Kishi, Naoki; Noro, Makoto; Iwaoka, Hideto; Suzuki, Kentaro, Fabry-Perot filter, wavelength-selective infrared detector and infrared gas analyzer using the filter and detector.
Bao Yufei ; Daugherty David ; Hsu Kevin ; Li Tom Q. Y. ; Miller Jeffrey W. ; Miller Calvin M., Fabry-perot fiber bragg grating multi-wavelength reference.
Miles Scott D. (Sandy UT) Mitchell John R. (Salt Lake City UT) Gregonis Donald E. (Salt Lake City UT) Harris Joel M. (Salt Lake City UT), Gas analysis system having buffer gas inputs to protect associated optical elements.
Sauer Ralf-Roland (Huttlingen DEX) Rupp Wolfgang (Aalen DEX) Hinz Alexander (Konigsbronn DEX), Gas laser for emitting light modulated at two different wavelengths and an arrangement incorporating the gas laser to de.
Van Hove James M. (Eagan MN) Kuznia Jon N. (Bloomington MN) Olson Donald T. (Roseville MN) Kahn Muhammad A. (White Bear Lake MN) Blasingame Margaret C. (Moundsview MN), High responsivity ultraviolet gallium nitride detector.
Smith William D. (Fremont CA) Dennis Richard (Ettons PA) Brathwaite Nicholas (Sunnyvale CA) Blish ; II Richard C. (Saratoga CA), Integrated circuit package for surface mount technology.
Schetzina Jan Frederick (Cary NC), Integrated heterostructures of Group III-V nitride semiconductor materials including epitaxial ohmic contact, non-nitrid.
Paldus, Barbara; Xie, Jinchun; Lodenkamper, Robert; Adams, David M.; Crosson, Eric; Katchanov, Alexander; Pakulski, Grzegorz; Rella, Chris W.; Richman, Bruce A., Laser tuning by spectrally dependent spatial filtering.
Butler,Hans; Boonman,Marcus Emile Joannes; Van Den Biggelaar,Petrus Marinus Christianus Maria, Lithographic apparatus and device manufacturing method with feed-forward focus control.
Thorland Rodney H. ; Sittler Daniel L. ; Carlson David W. ; Altmann Gerald R., Measurement method to facilitate production of self-aligning laser gyroscope block.
Walker Stephen D. ; Nichols Robert A. ; Curnan William A. ; Svai Sophat ; Braig James R. ; Goldberger Daniel S., Method and apparatus for measuring gas concentration using a semiconductor laser.
Haas Gerhard,DEX, Method and device for controlled illumination of an object for improving identification of an object feature in an image of the object.
James J. F. McAndrew ; Benjamin Jurcik FR; Carol Schnepper ; Ronald Inman ; Dmitry Znamensky ; Tracey Jacksier, Method and system for preventing deposition on an optical component in a spectroscopic sensor.
Paldus,Barbara; Richman,Bruce; Kachanov,Alexander; Crosson,Eric, Method for detecting a gaseous analyte present as a minor constituent in an admixture.
Halbout Jean-Marc (Larchmont NY) Treyz George V. (New York NY), Optical wavelength demultiplexing filter for passing a selected one of a plurality of optical wavelengths.
Laurent Dominique (Lyons FRX) Fortunato Gerard (Vienne FRX), Process for the simultaneous detection of several gases in a gaseous mixture, and equipment for using the process.
Wagner, Sigurd; Wagner, Matthias; Ma, Eugene Y.; Payne, Adam M., Semitransparent optical detector including a polycrystalline layer and method of making.
Sun Decai ; Kubby Joel A. ; Tran Alex T. ; Peeters Eric, Structure and method for a microelectromechanically tunable fabry-perot cavity spectrophotometer.
Daniel Tazartes ; John Mark ; Albert V. Scappaticci ; Michael W. Denice, Jr., System and method for providing cavity length control of a ring laser gyroscope.
Cohen Leonard G. (Atlanta GA) Henry Charles H. (Skillman NJ) Kazarinov Rudolf F. (Martinsville NJ) Wong Yiu-Huen (Summit NJ), Thermally activated optical switch.
Khan M. Asif (Burnsville MN) Schulze Richard G. (Hopkins MN) Skogman Richard A. (Plymouth MN), Tunable cut-off UV detector based on the aluminum gallium nitride material system.
Damask Jay N. ; Murphy Thomas E. ; Ferrera Juan ; Lim Michael Hong Yeol ; Smith Henry I. ; Haus Hermann A., Wavelength-selective optical add/drop switch.
※ AI-Helper는 부적절한 답변을 할 수 있습니다.