| 摘要 |
PURPOSE:To find relative humidity in high accuracy, by using two temperature sensors converting dry-bulb temperature and wet-bulb temperature into electric signals and an operator inputting the signals of these temperature sensors. CONSTITUTION:An output E=[-234.609X(t1-t2)+4508.877]/[(t1- t2)+45.049] is obtained from a thermistor RD outputting a dry-bulb temperature t1, a thermistor RW outputting a wet-bulb temperature t2, a subtraction circuit 1 operating a= t1-t2, an adder 2 operating b=a+45.049, a multiplication circuit 3 operating C=-234.609Xa, an adder 4 operating d=C+4508.877 and a division circuit 5 operating f=d/b. An electric signal RH expressing highly accurate relative humidity is obtained by performing an operation of RH=100-(100-E)X50.161/ (t1+20.161) by using this output E. |
