The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 26, 2003
Filed:
Aug. 17, 2000
David Christian Hovde, Cincinnati, OH (US);
Southwest Sciences Incorporated, Santa Fe, NM (US);
Abstract
A tone burst spectrometer and spectrometry method comprising employing a narrow bandwidth light source, a tone burst modulation waveform generator, synchronization of a lock-in amplifier to a burst frequency of the generator, and one or more of the following: use of a semiconductor laser; setting the tone frequency of the generator to an integer multiple of the burst frequency; using a tone modulation waveform other than a sine wave; setting the tone frequency of the generator to less than a half width at half maximum of a targeted spectral transition; and producing a spectral feature with a high signal to noise ratio while synchronizing the lock-in amplifier to the tone frequency of the generator or an odd harmonic of the tone frequency and wherein the output of the lock-in amplifier is low pass filtered and negative feedback is employed to stabilize the operating wavelength at or near a center wavelength of a spectral feature of the sample.