Fluorescent spectrophotometer system with automatic calibration

Details Fluorescent spectrophotometer system with automatic calibration Fluorescent spectrophotometer system with automatic calibration

1996-10-11

1998-03-24

Hantis, K.

Optics: measuring and testing

Sample, specimen, or standard holder or support

356326, G01N 2101

Patent

active

057318735

ABSTRACT:
A spectrophotometer system includes an optics block housing an excitation lamp and a cell for receiving a gas to be detected. The excitation lamp excites atoms of the gas to be detected to produce photons. The spectrophotometer system also includes a photo-multiplier tube assembly and an analog-to-digital converter. The photo-multiplier tube assembly detects the photons, and produces an analog output accordingly. The analog-to-digital converter converts this analog output to a digital output. The photo-multiplier tube assembly and the analog-to-digital converter of a spectrophotometer system are calibrated together so that a zero input to the analog-to-digital converter may be defined as an absence of photons. The optics block is configured to minimize scattering of light, without a lens, so that the output of the spectrophotometer system is a function of the number of atoms of the gas to be detected and not of scattered light.

REFERENCES:
patent: 4158505 (1979-06-01), Mathisen et al.
patent: 4279506 (1981-07-01), Maines
patent: 4750837 (1988-06-01), Gifford et al.
patent: 5305093 (1994-04-01), Dosmann
Description and Specifications of the Brooks Rand Cold Vapor Atomic Fluorescence Spectrophotometer, No date.
Summary page entitled AD7712 on Self Calibration, System Calibration, System Offset Calibration, Background Calibration, and Span and Offset Limits, Rev. B No date.
Operational Manual for CVAFS-2 Mercury Analyzer, by Brooks Rand, Ltd., dated Nov. 1, 1990, pp. 1-29.
Description, Specifications, and Technical Data of HC120 Series, 1/2 Inch Side-on PMT Detector Assembly, Hamamatsu Corporation, Revised Sep. 1991, 4 pages.

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