TEMPERATURE MEASURING DEVICE

摘要

PURPOSE:To simplify the constitution of a temperature measuring device, by feeding a sweep pulse to a temperature-sensitive resonance circuit and measuring the temperature from the voltage of a sweep wave continuing until the detection of resonance of a resonance circuit. CONSTITUTION:A VCO circuit 2 receives the output of a saw-toothed voltage generating circuit 1 and produces the sweep waves ranging from the frequency (fs) to the frequency (fe). An intermittent signal transmitting circuit 3 applies a pass signal to the sweep wave given from the circuit 2 and transmits the intermittent pulse to a temperature-sensitive resonance circuit 4 set at an area where the temperature to be measured is set. The circuit 4 has the resonance when the resonance frequency (fo) decided by the temperature of a temperature-sensitive quartz oscillator or the pulse of a frequency close to (fo) arrives and then sends the reflected wave to a time selection receiving circuit 5. The circuit 5 receives only the reflected resonance wave at a time point delayed by (t') from the intermittent pulse of the circuit 3 and applies it to a voltage detecting circuit 6. Then the voltage V of the circuit 1 which is applied to the circuit 2 is detected at the time point when the resonance reflected wave (fo) is detected. Then the temperature is displayed or a machine is operated through a processing circuit 7.