Spectrophotometer

Details Spectrophotometer Spectrophotometer

1983-09-12

1986-03-18

Smith, Alfred E.

Radiant energy

Invisible radiant energy responsive electric signalling

Infrared responsive

250343, 356323, G01N 2161

Patent

active

045771065

ABSTRACT:
In a double-beam spectrophotometer intended for spectral analysis in the infrared region, inputs to a light detector are switched to dark, reference light, sample light, and reference light in this order, and those components in an output signal of the detector which have a fundamental frequency corresponding to one cycle of the switching and a frequency twice the fundamental frequency undergo arithmetic operation to determine the ratio of the sample to reference light intensity, which is representative of the transmittance of the sample.

REFERENCES:
patent: 2679010 (1954-05-01), Luft
K. Leutwein, "A Simple Double Beam Accessory for Absorption Spectroscopy", Applied Optics, vol. 10, No. 1 (Jan. 1971) pp. 46-50.

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