Raman instrumentation
First Claim
1. A Raman instrument comprisinga laser to generate light in the frequency range of 920 to 1700 nm,said laser being positioned to direct its beam at a sample to be analyzed,light gathering optics positioned to receive reflected Raman scatter and feed such scatter to a spectrometer,a spectrometer to receive reflected scatter light and following treatment at a grating feed such light to a detector,a detector including electron bombardment particularly sensitive to light in the wavelength range of 950 to 1700 nm to receive light from said spectrometer and produce an output image of said light for analysis, anda display to report the identity of the elements of the sample.
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Abstract
A portable Raman spectroscopy instrument capable of discriminating between chemicals in the solid, liquid and vapor states is described. The instrument is in the shape of a gun and uses a solid state detector and an NIR laser. It relies on gating techniques to minimize weight and lower energy needs.
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Citations
20 Claims
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1. A Raman instrument comprising
a laser to generate light in the frequency range of 920 to 1700 nm, said laser being positioned to direct its beam at a sample to be analyzed, light gathering optics positioned to receive reflected Raman scatter and feed such scatter to a spectrometer, a spectrometer to receive reflected scatter light and following treatment at a grating feed such light to a detector, a detector including electron bombardment particularly sensitive to light in the wavelength range of 950 to 1700 nm to receive light from said spectrometer and produce an output image of said light for analysis, and a display to report the identity of the elements of the sample.
- 14. A method of making Raman measurements of a sample comprising pulsing a laser operating at a near IR frequency at a sample, gathering scattered Raman reflected light from said sample and directing it to a silicon based focal plane array detector through a spectroscope, said detector comprising a TE photocathode and said silicon based focal plane array, receiving said light at said detector at said TE photocathode of said detector causing electron bombardment of said silicon based focal plane array, determining the elements of the sample using library matching of detected information of the sample, and displaying the chemical information determined by library matching.
- 19. A method of improving responsivity in Raman spectroscopy comprising feeding gathered light from a sample to a TE photocathode in a detector, said detector comprising a TE photocathode positioned in facing relationship to a CMOS array across a vacuum, applying a bias to said CMOS array relative to said TE photocathode causing electron bombardment of said CMOS array conforming to the incoming light patterns.
Specification