INSTRUMENT FOR MEASURING AIR HUMIDITY Russian patent published in 2005 - IPC

Abstract RU 2251129 C2

FIELD: measuring engineering.

SUBSTANCE: instrument comprises a device for converting absolute humidity into electrical signal and recording device. The converter has multi-stage amplifier which consists of at least two amplifiers. The feedback circuit of the amplifiers is provided with semi-conducting thermistors. The thermistors are chosen to provide a given value of B=B₁+…+B_N, where B₁,…, B_N are the parameters which define temperature dependences of their resistances R_i = R∞_iexp(B_i/T). The multi-stage amplifier is provided with a correcting amplifier whose feedback circuit is provided with a resistor with the positive temperature resistance coefficient.

EFFECT: enhanced accuracy of measuring.

1 cl, 3 dwg

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RU 2 251 129 C2

Authors

Alejnikov N.M.

Alejnikov A.N.

Dates

2005-04-27—Published

2002-07-11—Filed