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A Small Laser Pulse Energy and Repetition Frequency Measurement Circuit
Pages: 76-80
Year: Issue:  9
Journal: Ordnance Industry Automation

Keyword:  frequency of the laser pulsephotoelectric detectionPIN photodiodepre-amplifier;
Abstract: A kind of circuit based on PIN photodiode is designed for measuring the frequency and power of laser pulse to solve the real-time detection problem of traditional laser power meter. The light intensity is decayed by the optical glass fixed in the front of the laser capsule. The photoelectric conversion is achieved by the PIN photodiode. After being processed through the conditioning circuit, the electricity signal is transferred to the microcontroller which calculates the pulse frequency in interrupt mode by counting the pulse amount and computes the pulse power by collecting the output voltage. This measuring system is able to monitor the state of high-power laser in real time. Results show that the frequency and power measurement precision of the circuit turns out to be less than 0.02% and 1% respectively. The sensitivity of this design is higher than 0.8 V/mW, while the response time is lower than 3 ns.
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