Method and apparatus for phase for and amplitude detection

Details Method and apparatus for phase for and amplitude detection Method and apparatus for phase for and amplitude detection

1994-10-12

1998-06-09

Soderquist, Arlen

Chemistry: analytical and immunological testing

Miscellaneous

73 1903, 73 2335, 73 2401, 73 2406, 422 83, 422 88, 422 89, 422 98, 436139, 436162, G01N 3300, G01N 2902

Patent

active

057632839

ABSTRACT:
A new class of techniques been developed which allow inexpensive application of SAW-type chemical sensor devices while retaining high sensitivity (ppm) to chemical detection. The new techniques do not require that the sensor be part of an oscillatory circuit, allowing large concentrations of, e.g., chemical vapors in air, to be accurately measured without compromising the capacity to measure trace concentrations. Such devices have numerous potential applications in environmental monitoring, from manufacturing environments to environmental restoration.

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