CN202485694U - Laser detection circuit - Google Patents
Laser detection circuit Download PDFInfo
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- CN202485694U CN202485694U CN2011204718446U CN201120471844U CN202485694U CN 202485694 U CN202485694 U CN 202485694U CN 2011204718446 U CN2011204718446 U CN 2011204718446U CN 201120471844 U CN201120471844 U CN 201120471844U CN 202485694 U CN202485694 U CN 202485694U
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Abstract
The utility model provides an optical detection circuit use for a fiber grating sensor, and especially relates to a laser detection circuit which can detect a weak signal. The laser detection circuit includes a current-voltage conversion circuit, a low-noise broadband amplification circuit, and a signal coding circuit. The current-voltage conversion circuit includes a laser receiving assembly and a preamplifier. The input terminal of the laser receiving assembly is connected with the output terminal of the fiber grating sensor. The output terminal of the laser receiving assembly is connected with the preamplifier. The output terminal of the preamplifier is connected with the input terminal of the low-noise broadband amplification circuit. The output terminal of the low-noise broadband amplification circuit is connected with the signal coding circuit. The laser detection circuit can achieve the stable detection performance via the simple circuit design, and can guarantee the high sensitivity and the high precision of an optical detection system in a dynamic working scope of the fiber grating sensor, so the anti-interference capability is improved. The optical detection circuit not only can detect an echo signal of the fiber grating sensor, but also can be applied to the detection coding of a majority of laser signals.
Description
Technical field
The utility model provides a kind of photodetection circuit that is used for fiber-optic grating sensor, is specifically related to a kind of a kind of laser acquisition circuit that detects feeble signal.
Background technology
Fiber grating is the most rising at present and one of the most representative fiber optic passive device, utilizes the fiber-optic grating sensor of its making can be widely used in stress, temperature, pressure, ultrasound wave, acceleration, high-intensity magnetic field and the force measurement.Up to the present, fiber-optic grating sensor has obtained successful application at aspects such as civil engineering, Aero-Space, boats and ships shipping, power industry, petrochemical industry, medical science, nuclear industry.The laser acquisition circuit is as the Photoelectric Detection link; Detection fiber optical grating reflection light signal center wavelength accurately; Obtain measured physical quantity and change corresponding wave length shift, through after real-time Treatment Analysis and the scale transformation, can obtain the size of measured physical quantity again.At present, its sensitivity of laser acquisition circuit of generally adopting is all on the low side.
Summary of the invention
The purpose of the utility model is to propose a kind of highly sensitive laser acquisition circuit that is used for fiber-optic grating sensor.
The technical scheme of the utility model is; Said laser acquisition circuit comprises: current-to-voltage converting circuit, low noise wideband amplification circuit and signal encoding circuit; Current-to-voltage converting circuit comprises a laser pick-off assembly and prime amplifier; The input end of laser pick-off assembly and the output terminal of fiber-optic grating sensor join, and the output terminal and the prime amplifier of laser pick-off assembly join; The input end of the output terminal of prime amplifier and low noise wideband amplification circuit joins, and the output terminal of low noise wideband amplification circuit and signal encoding circuit join.
It is voltage signal with the detection current conversion of laser detector that described current-to-voltage converting circuit adopts operational amplifier.
Said signal encoding circuit carries out binary conversion treatment to signal on the corresponding time.
Advantage that the utlity model has and beneficial effect; When the utility model is directed against laser detector detection fiber grating sensor echo; Faint and the big characteristic of noise of output electrical signal energy; Be provided with the low noise wideband amplification circuit,, do not influence the dynamic perfromance of fiber-optic grating sensor output signal simultaneously again through noise reduction and amplification effectively.Design current voltage conversion circuit, low noise wideband amplification circuit and signal encoding circuit, the high Precision Detection of realization weak signal, the processing of follow-up fiber grating demodulation circuit is satisfied in output.The utility model obtains the stable detection performance through simple circuit design, guarantees that optical detection system has highly sensitive and high precision in the dynamic range of fiber-optic grating sensor work, has improved antijamming capability.This photodetection circuit can not only the detection fiber grating sensor echoed signal, and can be used for the detection coding of most of laser signal.
Description of drawings
Fig. 1 is the circuit theory diagrams of the utility model.
Embodiment
Explain further details in the face of the present invention down.Said laser acquisition circuit comprises: current-to-voltage converting circuit, low noise wideband amplification circuit and signal encoding circuit; Current-to-voltage converting circuit comprises a laser pick-off assembly and prime amplifier; The input end of laser pick-off assembly and the output terminal of fiber-optic grating sensor join, and the output terminal and the prime amplifier of laser pick-off assembly join; The input end of the output terminal of prime amplifier and low noise wideband amplification circuit joins, and the output terminal of low noise wideband amplification circuit and signal encoding circuit join.
The echoed signal that PIN diode LED 301 among Fig. 1 will receive fiber grating is converted into and the proportional current signal of light signal, and the electric current of output is very faint, generally has only several microamperes of numbers; Forming current-to-voltage converting circuit through amplifier U301A, P IN diode LE 301, feedback resistance R302, is voltage signal and preposition processing and amplifying with its current conversion, and PIN diode is when receiving light signal; Produce inverse current Ip, it is equivalent to a current source, because the positive and negative input end of ideal operational amplifier has the characteristic of " empty short "; So; Its loaded impedance is zero, and its output characteristics is fine, again because the ideal operational amplifier input end has the characteristic of " empty disconnected "; The electric current of PIN pipe generation flows through feedback resistance R 302 so, and the output voltage that obtains amplifier is exaggerated; The voltage signal Vo of current-to-voltage converting circuit output exports to the low noise wideband amplification circuit, and it has suppressed the noise that dark current and undesired signal produce through zero potentiometer P 301 zeroings, and effective photosignal is inputed to amplifier U301B; The signal encoding circuit, to being treated to of light echo electric signal: amplifier U302A is operated in state of saturation, and amplifier U302B is that positive feedback connects, at a high speed output pulse sequence signal relatively.
Claims (3)
1. a laser acquisition circuit is characterized in that, said laser acquisition circuit comprises:
Current-to-voltage converting circuit, low noise wideband amplification circuit and signal encoding circuit; Current-to-voltage converting circuit comprises a laser pick-off assembly and prime amplifier; The input end of laser pick-off assembly and the output terminal of fiber-optic grating sensor join, and the output terminal and the prime amplifier of laser pick-off assembly join; The input end of the output terminal of prime amplifier and low noise wideband amplification circuit joins, and the output terminal of low noise wideband amplification circuit and signal encoding circuit join.
2. a kind of laser acquisition circuit according to claim 1 is characterized in that, it is voltage signal with the detection current conversion of laser detector that described current-to-voltage converting circuit adopts operational amplifier.
3. a kind of laser acquisition circuit according to claim 1 is characterized in that, said signal encoding circuit carries out binary conversion treatment to signal on the corresponding time.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204718446U CN202485694U (en) | 2011-11-18 | 2011-11-18 | Laser detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204718446U CN202485694U (en) | 2011-11-18 | 2011-11-18 | Laser detection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202485694U true CN202485694U (en) | 2012-10-10 |
Family
ID=46960110
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011204718446U Expired - Fee Related CN202485694U (en) | 2011-11-18 | 2011-11-18 | Laser detection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202485694U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103017933A (en) * | 2012-12-06 | 2013-04-03 | 大庆航天三沃新技术产业有限责任公司 | Weak light signal detection device for distributed type optical fiber temperature sensing |
| CN111854937A (en) * | 2020-07-02 | 2020-10-30 | 成都维客昕微电子有限公司 | Method for detecting light in specific wavelength range based on LEDs with different light emitting wavelengths |
-
2011
- 2011-11-18 CN CN2011204718446U patent/CN202485694U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103017933A (en) * | 2012-12-06 | 2013-04-03 | 大庆航天三沃新技术产业有限责任公司 | Weak light signal detection device for distributed type optical fiber temperature sensing |
| CN111854937A (en) * | 2020-07-02 | 2020-10-30 | 成都维客昕微电子有限公司 | Method for detecting light in specific wavelength range based on LEDs with different light emitting wavelengths |
| CN111854937B (en) * | 2020-07-02 | 2023-11-17 | 成都维客昕微电子有限公司 | Detection method for light in specific wavelength range based on LEDs with different light emitting wavelengths |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20121010 Termination date: 20161118 |
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| CF01 | Termination of patent right due to non-payment of annual fee |