| 摘要 |
<p>A temperature compensation circuit for use with a resistance-bridge type pressure transducer (1), particularly useful for wind tunnel experiments. In one embodiment, a differential amplifier (7) senses the transducer output and produces an output signal referenced to an intermediate voltage generated by an operational amplifier (8). The voltage across a sense resistor (R1) connected between the transducer and a power supply (2) varies in accordance with transducer temperature. These voltage variations are applied to the output signal by means of a summing amplifier (10) to compensate for thermal offset in the transducer output. Thermally-induced sensitivity variations in the transducer output may be further compensated by incorporating a thermally sensitive resistor (R3) placed in proximity to the transducer and a gain adjustment amplifier (12). In a digital embodiment, the transducer output and sense resistor voltage are digitised and fed into a signal processor (16) which corrects the transducer output to compensate for thermal offset sensitivity variation using calibration data from a digital memory (15).</p> |
