| 摘要 |
PURPOSE:To obtain an inexpensive, reliable device which is easily handled and to prolong its life by using a photodetection diode as a spark detector. CONSTITUTION:The photodetection diode 1 as the spark detector, a rectifying circuit, a DC amplifier 3, a current amplifier 4, an indicator 5, etc., are provided. Then, the diode 1 generates a pulse signal 1 proportional to the size of a spark and the circuit 2 converts the signal 1a into an analog signal 2a. Then the signal 2a is amplified 4 by amplifiers 3 and 4 to a level high enough to drive the indicator 5. The meter of the indicator 5 is driven with the amplified 4 signal 4a and the size of the spark is displayed. In this case, as the diode 1 which generates the signal 1a is a semiconductor, stable characteristics and long life are obtained, while the size is small, and the handling is easy. |
