Sensor using two tunable oscillators connected to a frequency mi

Details Sensor using two tunable oscillators connected to a frequency mi Sensor using two tunable oscillators connected to a frequency mi

1980-07-28

1982-05-25

Swisher, S. Clement

Measuring and testing

Instrument proving or calibrating

Volume of flow, speed of flow, volume rate of flow, or mass...

73703, G01L 2500, G01L 708

Patent

active

043310222

ABSTRACT:
A sensor of the type comprising two delay lines forming part of two oscillators whose output signals are mixed and in particular a surface acoustic wave sensor comprising a wafer made from a piezoelectric material comprising a calibrating device for calibrating the output frequency constituted by an additional delay line formed by a metal strip inserted in the connections of one of the oscillators. By means of a laser beam indentations are formed in this metal strip, thus causing an increase in the delay for adjusting the frequency of the output signals of the sensor to a predetermined value.

REFERENCES:
patent: 4100811 (1978-07-01), Cullen et al.
patent: 4216401 (1980-08-01), Wagner
patent: 4265124 (1981-05-01), Lim et al.

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