G - Physics – 01 – N
Patent
G - Physics
01
N
G01N 27/04 (2006.01)
Patent
CA 2084325
The present invention is to provide a circuit for detecting humidity in which occurrence of the temperature drift can be inhibited by a simple means and therefore which is able to detect humidity precisely without regard to the temperature of the atmosphere. In a humidity detection circuit including a bridge circuit containing temperature elements, the bridge circuit is connected with a series of a third resistance R3, a current controlling element and a power supply in this order, while a series of fourth and fifth resistances R4 and R5 is arranged in parallel with the series of the R3 and the bridge circuit. In addition a junction between R4 and R5 and another junction between R3 and the bridge circuit are connected separately to a voltage comparing circuit, the output of which is inputted into the current controlling element. In this arrangement, a control section is provided to detect the potential of the junction between the bridge circuit and the third resistance R3. The humidity detection circuit, based upon the detected potential, changes the resistance value of resistance R5 to an optimum level at which the temperature drift does not occur.
G. Ronald Bell & Associates
Sharp Kabushiki Kaisha
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