Logarithmic resistance-to-frequency converter

Details Logarithmic resistance-to-frequency converter Logarithmic resistance-to-frequency converter

1973-02-15

1976-01-20

Queisser, Richard C.

Measuring and testing

Gas analysis

Moisture content or vapor pressure

323 75K, 331 66, 331140, G01K 724

Patent

active

039330460

ABSTRACT:
By including four resistors and a capacitor in a bridge and connecting the bridge to the input terminals and the output terminals of a comparator amplifier a relaxation oscillator is obtained the square-wave frequency of which depends logarithmically upon the ratio of two resistances. Linearization is obtained by using a measuring-value transducer the resistance of which depends exponentially upon a physical quantity, such as temperature, as one of the resistors. The converter may be used in frequency-analog transmission of measuring values and in measuring instruments for measuring-value indication without the need for linearizing steps.

REFERENCES:
patent: 2426232 (1947-08-01), Newhouse
patent: 3217144 (1965-11-01), Hinnah
patent: 3345874 (1967-10-01), Carniol et al.
patent: 3461392 (1969-08-01), Hughs et al.
patent: 3555448 (1971-01-01), Clarke et al.
patent: 3560877 (1971-02-01), Ilin et al.
patent: 3572109 (1971-03-01), Yerman
patent: 3731535 (1973-05-01), Wendt
patent: 3817105 (1974-06-01), Luhowy
Lovborg, L., A Linear Temperature-to-Frequency Converter, In the Jour. Sci. Instr., Vol. 42, 1965, pp. 611-614.

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