| 摘要 |
PURPOSE:To elevate the computing speed while simplifying the circuitry of an arithmetic unit, by computing an absolute humidity from a dry bulb temperature and relative humidity by a specified simple formula. CONSTITUTION:A moisture signal voltage output section 1 outputs a voltage represented by a linear function with the relative humidity phi from a humidity signal output section 5 as variable and a temperature signal voltage output section 2 changes the amplication factor based on a resistance represented by a linear function with the dry bulb temperature (t) from a temperature signal output section 6 as variable. A multiplier 3 multiplies a temperature output signal and a relative humidity output signal to output an absolute humidity (x) to an output section 4 as voltage value. Then, the absolute humidity (x) determined by an arithmetic unit A composed of output sections 1, 2 and 4 and multiplier 3 is obtained by computing the function x=atphi+bt+cphi+d expressed by constants (a), (b), (c) and (d), the relative humidity phi and the dry bulb temperature (t). Here, constants a-d can be obtained based on a moist air diagram and a basic formula for computing the absolute humidity. |
