| 摘要 |
PROBLEM TO BE SOLVED: To provide an oscillation detection device with high resolution by using an oscillation sensor which outputs oscillation as a voltage.SOLUTION: The oscillation detection device includes: an oscillation sensor section 1 which detects oscillation, and converts the change of oscillation energy into the change of a voltage, and outputs it; and a voltage control oscillator 2 to which the change of the voltage is input from the oscillation sensor section 1, and which converts the change of the voltage into the change of a corresponding oscillation frequency, and outputs it as a signal wave. The voltage control oscillator 2 is constituted of a Colpitts oscillation circuit using a crystal oscillator 31 and variable capacitance diodes VD1 and VD2. When a control voltage is supplied to a control input terminal, the capacities of the variable capacitance diodes VD1 and VD2 are set to a capacitance value corresponding to the control voltage, and a resonance section is made to resonate with a frequency corresponding to the capacitance value so that the change of oscillation energy input as a voltage to the voltage control oscillator 2 can be converted into the change of a frequency in the voltage control oscillator 2. |
