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A single photon counting discriminator circuit with dark counting pulse discrimination

A technology of single photon counting and discrimination, applied in the direction of instruments, etc., can solve the problems of reducing dark counts, etc., and achieve the effect of improving signal-to-noise ratio, simple structure, and reducing dark counts

Inactive Publication Date: 2017-06-16
CHINA JILIANG UNIV
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  • Abstract
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Problems solved by technology

In the signal processing circuit in the single-photon detection system, the dark count can also be reduced by increasing the comparison threshold of the discriminator, but the premise is that the threshold must ensure that the signal pulse passes through, and there must be a margin, so this method Can only remove some small amplitude dark count pulses

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  • A single photon counting discriminator circuit with dark counting pulse discrimination
  • A single photon counting discriminator circuit with dark counting pulse discrimination

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Embodiment Construction

[0010] Further illustrate the present invention below in conjunction with accompanying drawing.

[0011] refer to figure 1 , The single photon counting discriminator circuit with dark counting pulse discrimination of the present invention comprises: resistor R1, resistor R2, resistor R3, resistor R4, rheostat W1, capacitor C1, capacitor C2, capacitor C3, capacitor C4, capacitor C5, Diode D1, electronic switch K1, comparator IC1 and operational amplifier IC2; one end of capacitor C5 is the input terminal IN, the other end is connected to the positive phase end of comparator IC1, and the end of capacitor C1 and capacitor C4 connected in parallel is connected to the input terminal of comparator IC1 The power supply end and one end of the resistor R1 are connected to the DC power supply Vcc, the other end of the parallel connection of the capacitor C1 and the capacitor C4 is connected to the ground, and the other end of the resistor R1 is connected to one end of the rheostat W1, t...

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Abstract

The single photon counting discriminator circuit with dark counting pulse discrimination of the present invention comprises: resistor R1, resistor R2, resistor R3, resistor R4, rheostat W1, capacitor C1, capacitor C2, capacitor C3, capacitor C4, capacitor C5, diode D1 , Electronic switch K1, comparator IC1 and operational amplifier IC2. Resistor R1, resistor R3, capacitor C1, capacitor C4, capacitor C5, comparator IC1 and rheostat W1 form a comparator with adjustable threshold. Resistor R2, resistor R4, diode D1, electronic switch K1, capacitor C3 and operational amplifier IC2 form a counting trigger pulse integration circuit. The invention distinguishes the dark counting pulse by judging the pulse width of the counting trigger pulse, thereby effectively reducing the dark counting of the single photon detection system. Compared with the traditional refrigeration technology, the invention has the advantages of simple structure, low cost and low power consumption.

Description

technical field [0001] The invention relates to a single photon counting discriminator circuit with dark counting pulse discrimination. Background technique [0002] Single photon detection technology is a kind of extremely weak light detection technology. It has a wide range of applications in sensory fields. The photoelectric receiving devices used in single photon detection technology mainly include photomultiplier tubes, avalanche photodiodes and superconducting nanowire single photon detection devices. In the single-photon detection system using these photoelectric receiving devices, the dark count is an important source of noise, and reducing the dark count is an important means to improve the detection sensitivity of the single-photon detection system. Dark counts mainly come from thermal excitation, tunnel penetration and potential wells at doping defects. Thermal excitation will cause electrons to transition from full band to empty band, and at the same time, hole...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01J11/00
Inventor 余向东张在宣王剑锋刘红林张文平
Owner CHINA JILIANG UNIV
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