| 摘要 |
To provide temperature compensation in a 'Wheatstone' bridge which includes piezo-resistors (R3, R4), a temperature-dependent signal is derived from the bridge itself and fed to a processing circuit (8) together with the bridge output voltage US. As described the arrangement measures declaration of a vehicle and is used to trigger an air-bag (11). The temperature signal may be taken off across a resistor (R5) which carries the bridge supply current since the current varies with the temperature of the resistors (R3, R4). Alternatively the temperature signal is taken from one of the piezo-resistors by use of a switching circuit (Fig. 3 not shown). <IMAGE> |
