Wind speed measuring device and air volume measuring device

摘要

Provided is a wind speed measuring device which has a simple configuration, can be manufactured inexpensively, and has high measurement accuracy. The constant temperature heating device 10 includes a power supply Vcc, a heating element 21 (positive characteristic thermistor elements PCT1 to PCT3), a switching element Q1, and a comparator element Cmp1. The heating element and the first negative characteristic thermistor element NTC1 constitute a wind speed sensor portion, and the switching element Q1 sets the heating element 21. The on and off states are repeated so that heat is generated by temperature, and a pulse voltage is applied from the power supply Vcc to the heating element 21, and the wind speed of the wind striking the wind speed sensor unit is calculated Do.