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Balanced photoelectric detector

A photoelectric detector and balanced technology, applied in the field of photoelectric detection, can solve the problems of large volume, low cost, and low cost, and achieve the effect of small packaging box, simple circuit, and good stability

Inactive Publication Date: 2020-01-10
SHANXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to overcome the above-mentioned defects existing in the existing balanced photodetector, namely: the detector gain cannot be continuously adjusted, the bias voltage can not be adjusted to zero, the volume is large and the cost is high, and a balanced photodetector is proposed. The bias voltage of the signal after the subtraction of the two input optical signals is adjusted by the bias voltage zero adjustment circuit, and the amplification factor of the adjustable gain circuit can be continuously changed by continuously adjusting the resistance value of the sixteenth resistor in the adjustable gain circuit, The circuit is simple and the cost is low, and the balanced photodetector proposed by the present invention is small in size and low in cost

Method used

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  • Balanced photoelectric detector
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Embodiment 1

[0025] The balanced photodetector of this embodiment, such as figure 1 As shown, it includes photoelectric conversion circuit, active filter circuit, bias voltage adjustment circuit, adjustable gain circuit, BNC connector and power supply voltage stabilization circuit. The photoelectric conversion circuit is connected with the adjustable gain circuit through the active filter circuit; two active A bias voltage adjustment circuit is arranged between the source filter circuits, the bias voltage adjustment circuit is connected with the adjustable gain circuit, and the adjustable gain circuit is connected with a BNC connector; the power supply voltage stabilization circuit is connected with the photoelectric conversion circuit, active filter circuit, adjustable Gain circuit connection.

[0026] The power supply voltage stabilizing circuit includes a first voltage regulator U1, a second voltage regulator U2, a first capacitor C1, a second capacitor C2, a third capacitor C3, and a f...

Embodiment 2

[0034] The balanced photodetector of this embodiment, such as figure 2 As shown, a packaging box is also included, and the circuit in the packaging box is as in embodiment 1. A first round hole 112 and a second round hole 113 are opened above the top cover 1 of the packaging box, and the first round hole 112 and the second round hole 113 One of them is used to fix the power supply VCC input connector of the photodetection circuit, and the other is used to fix the BNC connector of the output signal of the photodetection circuit. The front panel 6 of the packaging box has a third round hole 7 and a fourth round hole 8 , the third round hole 7 and the fourth round hole 8 are used for light transmission, that is, the detected two-way optical signals can be coupled to the first photodiode D1 of the photodetection circuit through the third round hole 7 and the fourth round hole 8 and the second photodiode D2, the back cover 4 of the packaging box is provided with a first small hole...

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Abstract

The invention relates to a photoelectric detection technology and particularly relates to a balanced photoelectric detector with bias zeroing and continuously adjustable gain. A photoelectric conversion circuit is connected with an adjustable gain circuit through active filter circuits. A bias voltage regulating circuit is arranged between the two active filter circuits and is connected with the adjustable gain circuit. A power supply voltage stabilizing circuit is respectively connected with the photoelectric conversion circuit, the active filter circuits and the adjustable gain circuit, so the continuous adjustment of gain is realized, and the zero setting of bias voltage is realized. The detector also comprises a packaging box. A first circular hole and a second circular hole which arerespectively used for fixing a power supply input connector and a BNC connector of the photoelectric detection circuit are formed above a top cover of the packaging box, a front panel of the packagingbox is provided with a third circular hole and a fourth circular hole which are used for inputting optical signals, and a rear cover of the packaging box is provided with a first small hole and a second small hole which penetrate through a sixteenth resistor adjusting knob and an eleventh resistor adjusting knob. The detector of the invention has the advantages of small size and low cost.

Description

technical field [0001] The invention relates to photoelectric detection technology, in particular to a balanced photodetector with bias zero adjustment and continuously adjustable gain. Background technique [0002] A balanced photodetector is a balanced receiving device that subtracts two optical input signals. The use of balanced photodetectors can eliminate common-mode noise and extract small changes in the signal path from the background noise of interference. It is used in basic and applied scientific researches such as heterodyne detection, laser frequency locking, spectral measurement, weak signal detection and optical delay measurement. have important applications. At present, the band-gain balanced photodetectors produced by Thorlabs and Newfocus of the United States are mainly used at home and abroad, but their shortcomings are also obvious: first, the existing balanced photodetectors are relatively large in size due to their own structure limitations, and are not...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01J1/46
CPCG01J1/46G01J2001/4406G01J2001/444G01J2001/446
Inventor 李玉清卫奥尼马杰武寄洲肖连团贾锁堂
Owner SHANXI UNIV