Spectrophotometric sensor assembly including a microlamp

Details Spectrophotometric sensor assembly including a microlamp Spectrophotometric sensor assembly including a microlamp

1993-09-02

1995-03-28

Hannaher, Constantine

Radiant energy

Invisible radiant energy responsive electric signalling

Infrared responsive

25033913, G01N 2161

Patent

active

054019664

ABSTRACT:
A spectrophotometric sensor assembly that may find particular use in a capnometer, a medical device for measuring the concentration of carbon dioxide in the exhaled breath of a patient, includes at least one microlamp. A microlamp is a very small source of electromagnetic radiation including a heated filament disposed over a substrate. The microlamp may be constructed using semiconductor fabrication techniques. The microlamp typically emits broad-band infrared radiation. Radiation from the microlamp usually passes through a filter, which preferentially transmits radiation of a preselected wavelength. The radiation then passes through a sample chamber and onto a detector. The concentration of a substance of interest within the chamber may be computed by determining the degree to which the radiation is absorbed in the chamber. In a preferred embodiment, an array of microlamps is sequentially triggered in a rapid manner.

REFERENCES:
patent: 4648396 (1987-03-01), Raemer
patent: 5134302 (1992-07-01), Rosenthal
patent: 5153436 (1992-10-01), Apperson et al.
patent: 5159199 (1992-10-01), LaBaw
Solomon, Rodney J. "A Reliable, Accurate CO.sub.2 Analyzer for Medical Use," (Sep. 1981) Hewlett-Packard Journal pp. 3-21.
Mastrangelo, Carlos H. et al. "Electrical and Optical Characteristics of Vacuum-Sealed Polysilicon Microlamps," IEEE Transactions On Electron Devices, vol. 39, No. 6, (Jun. 1992) pp. 1363-1375.

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