Photoelectric conversion rotation speed meter capable of achieving smooth setting of transient and stable delay time
A delay time, photoelectric conversion technology, applied in the field of optical communication, can solve the problems of difficulty and long maintenance time of the rotary air preheater, and achieve the effect of smooth delay time and accurate and precise measurement
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Embodiment 1
[0024] A photoelectric conversion tachometer that can smoothly set the delay time of the transient state, which can smoothly adjust the delay time of the monostable state, so as to effectively ensure that the delay time of the monostable circuit is excessively flat, due to the multi-position potentiometer The resistance characteristic makes it possible to set different temporary stable pulse widths, so as to accurately measure the rotational speed of the rotary air preheater, such as figure 1 As shown, the following structure is specially set up: including a processing circuit, a monostable delay circuit is arranged in the processing circuit, a monostable time base chip circuit, a switch circuit are arranged in the monostable delay circuit and a switch circuit, the monostable time base chip circuit is connected to a switch circuit, the switch circuit is connected to a switch circuit, and the switch circuit is connected to a monostable time base chip circuit; the switch circuit ...
Embodiment 2
[0026] This embodiment is further optimized on the basis of the above-mentioned embodiments, further to better realize the present invention, such as figure 1 As shown, the following structure is particularly provided: the monostable time base chip circuit includes a time base chip U2, a resistor R2, a capacitor C3 and a capacitor C4, and the reset pin 4 and the power pin 8 of the time base chip U2 share a common Connected and connected to the first fixed end of the potentiometer W4; the reset lock pin 6 and the discharge pin 7 of the time base chip U2 are connected together and connected to the switch circuit; the first end of the capacitor C4 is connected to the time base chip The reset lock pin 6 of U2, and the second end of the capacitor C4 is connected to the second end of the capacitor C3; the first end of the capacitor C3 is connected to the control pin 5 of the time base chip U2, and the second end of the capacitor C3 It is connected to the ground pin 1 of the time bas...
Embodiment 3
[0028] This embodiment is further optimized on the basis of the above-mentioned embodiments, further to better realize the present invention, such as figure 1 As shown, the following structure is particularly provided: a trigger circuit is also provided in the processing circuit, and the trigger circuit includes a time base chip U1, a resistor R1, a capacitor C1, a capacitor C2 and a potentiometer W1, and the time base The power supply pin 8 of the chip U1 and the reset pin 4 are connected together and connected to the first fixed end of the potentiometer W1, and the power supply pin 8 of the time base chip U1 is connected to the power supply pin 8 of the time base chip U2; the potentiometer W1 The second fixed end of the potentiometer W1 is connected to the control pin 5 of the time base chip U1; the output pin 3 of the time base chip U1 is connected to the trigger point pin 2 of the time base chip U2 through the capacitor C2; The ground pin 1 of the time base chip U1 is grou...
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