Measuring and testing – Liquid analysis or analysis of the suspension of solids in a... – Content or effect of a constituent of a liquid mixture
Patent
1975-04-14
1977-06-14
Queisser, Richard C.
Measuring and testing
Liquid analysis or analysis of the suspension of solids in a...
Content or effect of a constituent of a liquid mixture
73 24, G01N 2124
Patent
active
040289320
ABSTRACT:
Three embodiments of an improved photo acoustic cell for use in analyzing solid and quasi-solid samples are disclosed. Each cell includes a sample holding chamber having one wall or portion of one wall thereof made from a light transparent material. The sample holding chamber in each embodiment is connected to a microphone by a thin tube which renders the cell, which includes the chamber tube and microphone, an acoustical resonant structure at a frequency within the response characteristics of the microphone. In one embodiment, means are disclosed for pressuring the inside of the cell as well as equalizing the pressure on the outside of the tube. In a second embodiment, the sample to be analyzed forms a portion of the cavity walls and means are provided for reducing the pressure in the cavity to hold the sample securely to the remaining structure for defining the cavity. In this embodiment a fiber optic element brings the light into the chamber. In the third embodiment the cell is mounted relative to a support structure so that different portions of the sample can be brought into relationship with can advantageously be employed to analyze plates, paper or the like which result from chromatographic techniques.
REFERENCES:
patent: 3532181 (1970-10-01), DeMaria et al.
patent: 3583212 (1971-06-01), Nanney et al.
patent: 3700890 (1972-10-01), Kreuzer
patent: 3820901 (1974-06-01), Kreuzer
Bell, A. G. Upon the Production of Sound by Radiant Energy, in Philosophical Magazine, vol. 11, pp. 510-528, 1881.
Kreuzer et al., Nitric Oxide Air Pollution: Detection by Optoacoustic Spectroscopy, Science, vol. 173, pp. 45-47, July 1971.
Kreuzer et al., Air Pollution: Sensitive Detection of Ten Pollutant Gases by Carbon Monoxide Lasers, Science, vol. 177, pp. 347-349, July 28, 1972.
Hoffman-La Roche Inc.
Kreitman Stephen A.
Queisser Richard C.
Welt Samuel L.
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