SU650014A1 - Thermoanemometer - Google Patents

Description

In comparison, the comparison device generates a mismatch signal, which is fed through a memory device to a pulsed regulated current source, whose pulse amplitude during the next half-period depends on the correction signal emitted by the memory device. The switch provides alternate operation of circuit elements. To compensate for the temperature, it is necessary to select the gain in the feedback circuit, which is equal to

 and,

TO,

If

,

Ag - -,

2

e f / i - voltage on sensitive

element at a temperature of 7i; f / 2 is the voltage across the sensitive element at a temperature TZ-, (the magnitudes of the voltages V and Vz correspond to the operating mode of the sensitive element, like a temperature sensor); / 1 - current through the sensitive element at a temperature Gj / 2 - current through the sensitive element at a temperature, (the values of currents 1 and / 2 correspond to the operating mode of the sensitive element as a flow velocity sensor).

To compensate for the temperature, it is necessary that

k, k / 4f i,

- -7- ... -r COnst.

jftl

L-0

.

to

2

Claims (2)

1. USSR author's certificate number 491896, cl. G 01 P 5/12, 1975. 2. US patent number 3603147, cl. 73-189, 1971.