[특허]Method and apparatus for reducing fringe interference in laser spectroscopy

Method and apparatus for reducing fringe interference in laser spectroscopy 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	G01N-021/35 G01N-021/61
출원번호	US-0767497 (1991-09-30)
발명자 / 주소	Whittaker Edward A. (Hoboken NJ) Sun Hoi C. (Bloomfield NJ)
출원인 / 주소	Consortium for Surface Processing, Inc. (Princeton NJ 02)
인용정보	피인용 횟수 : 36 인용 특허 : 0

초록 ▼

A method and apparatus using a frequency tunable laser to generate a beam which passes through a sample cell and onto an optical detector wherein the tunable laser is modulated at a predetermined frequency which has the undesired effect of producing a periodic interference fringe near an absorption induced signal. An additional level of modulation is applied to the laser beam by a triangular waveform having a predetermined peak-to-peak amplitude and frequency. The triangular waveform peak-to-peak amplitude produces a frequency swing of the laser beam so as to generate from the periodic interference fringe, a signal having reduced components near the absorption induced signal. The signal at the optical detector is demodulated by a lock-in amplifier tuned to a predetermined harmonic of the frequency of the triangular waveform.

대표청구항 ▼

A method for reducing fringe interference in laser absorption spectroscopy using a frequency tunable laser aligned to pass a laser beam through a sample volume and to an optical detector to thereby detect an absorption induced signal from the sample, said method comprising the steps of: modulating the tunable laser at a first predetermined frequency having the undesired effect of generating a periodic interference fringe near the absorption induced signal; modulating the tunable laser with a triangular waveform having a predetermined peak-to-peak amplitude and a second predetermined frequency different from said first predetermined frequency, the predetermined peak-to-peak amplitude of the triangular waveform being selected to generate a frequency swing of the laser beam sufficient to produce from the periodic interference fringe a signal having reduced components near an absorption induced signal; and demodulating the signal received by the optical detector at a predetermined harmonic of the second predetermined frequency of the triangular waveform; whereby the signal-to-background ratio of the absorption induced signal is enhanced.

이 특허를 인용한 특허 (36)

Veale, James R., Apparatus and method for nondestructive monitoring of gases in sealed containers.
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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.
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Kluczynski, Pawel; Larking, Rikard, Method for reducing interference fringes by moving timing of triangular motion.
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Mangold, Markus; Tuzson, Bela; Emmenegger, Lukas, Method for reducing interference fringes in laser spectroscopy measurements using an absorption mask in combination with multi-pass optical cells.
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Majewski, Alexander; Noll, Robert; MacFarlane, Malcolm J., Multi-channel optical cell.
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Paige,Mark E.; Bomse,David S.; Silver,Joel A., Optical absorbance sensitivity and reliability improvement via rotation of sample container.
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Bomse David S., Phaseless wavelength modulation spectroscopy.
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Cannon,Bret D., Reduction of residual amplitude modulation in frequency-modulated signals.
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Van Kesteren, Hans W., Sample concentration detector with temperature compensation.
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Majewski, Alexander; Abreu, Rene, System and method for magnitude and phase retrieval by path modulation.
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Method and apparatus for reducing fringe interference in laser spectroscopy 원문보기

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Method and apparatus for reducing fringe interference in laser spectroscopy 원문보기

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