Large dynamic high speed weak pulse signal linear measuring circuit

A technology of pulse signal and linear measurement, which is applied in the direction of measuring devices, measuring heat, calorimeters, etc., can solve the problems of affecting correct measurement, fast signal rise speed, loss of primary signal, etc., and achieve reasonable design, stable performance and novel concept Effect

Inactive Publication Date: 2010-08-18
ZHEJIANG UNIV +1
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Problems solved by technology

[0010] 2. The peak hold circuit uses a general peak hold circuit, which can effectively hold a slower signal, but when the signal pulse width is very narrow, the signal rises very fast, and this circuit is prone to overshoot, which affects the Me

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  • Large dynamic high speed weak pulse signal linear measuring circuit
  • Large dynamic high speed weak pulse signal linear measuring circuit
  • Large dynamic high speed weak pulse signal linear measuring circuit

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Embodiment Construction

[0024] The present invention performs energy measurement on weak and fast pulsed laser signals, and has the following key points.

[0025] 1) Measurement of pulsed laser energy

[0026] When using a photodiode as a detector, the photocurrent generated is directly proportional to the incident light power, so the incident light energy is proportional to the number of charges generated. Therefore, when measuring, the current output by the photodiode must be integrated. , so as to get the incident laser energy value;

[0027] 2) Measurement of weak signals

[0028] The measured signal is a very weak and fast-changing signal. In the actual energy measurement process, since the output current must be integrated to represent energy, even if a narrow-band filter is added to the front end of the photodiode, the integral effect of stray light in the environment is still far greater. Because of the weak pulse signal, it is necessary to extract the current signal through the high-speed ...

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Abstract

The invention discloses a large dynamic high speed weak pulse signal linear measuring circuit. The circuit comprises a photoelectric detector, a prepositive current pressure conversion circuit, a high speed integrating circuit, a peak holding circuit, a low frequency voltage amplifying circuit and an AD sampling circuit; wherein the photoelectric detector is sequentially connected with the prepositive current pressure conversion circuit, the high speed integrating circuit, the peak holding circuit, the low frequency voltage amplifying circuit and the AD sampling circuit. The invention has novel conception, reasonable design and stable performance and provides a large dynamic high speed weak pulse signal linear measuring circuit. A common peak holding circuit is adopted in the invention, slower signal can be effectively held; measuring range switching manner is still adopted, thus the aim of expanding measuring range can be achieved; and dynamic measuring range of more than 30dB can be achieved without switching channel.

Description

technical field [0001] The invention relates to a laser signal measuring circuit, in particular to a linear measuring circuit of a large dynamic high-speed weak pulse signal. Background technique [0002] In the existing methods for measuring pulsed laser energy, there are generally two types in terms of detection sensors: pyroelectric type and photodiode type. Among them, the pyroelectric type laser energy meter has a fast response speed, but its response ability is relatively weak, so The photodiode type laser energy meter is often used for weak laser energy measurement. [0003] Most of the existing methods of making laser energy meters that can be found at present have a high detectable minimum energy, and the wide dynamic range is mostly realized by automatically switching the range, such as two in the US patent: [0004] 1) Laser energy control circuit patent number: 4345330 [0005] 2) Laser energy monitor circuit patent number: 3732491 [0006] Several of the desi...

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Application Information

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IPC IPC(8): G01J11/00G01K17/00
Inventor 项震高卫葛剑虹党东妮包学志王乃为王泗宏李斌黄惠明喻戈阳
Owner ZHEJIANG UNIV
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