A modified temperature-compensation circuit for CTA

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Abstract
Hot-wire anemometric measurements of non-isothermal flows require that temperature-compensation or correction systems should be applied. A basic method of temperature compensation in a constant temperature anemometric bridge circuit involves an additional compensating sensor being connected into the bridge. The resistance of the temperature-compensating sensor must be several times bigger than that of the anemometric sensor. That is one of the major limitations of those sensors. This paper presents some modification to the constant-temperature bridge system with temperature compensation. A compensating sensor of any resistance may be applied there. As a result, a wider group of measuring sensors may be used, which, in certain applications, may optimize measuring processes. This modification consists of transformation of the voltage supplying the compensating branch of the anemometric bridge. Special attention was given to the theoretical basis of temperature compensation. Schematic diagrams of the measurement circuits as well as one selected application of the new system for a low-frequency case have been presented.