CN201974478U - Detection apparatus of harmonic signal of photoelectric conversion capable of reducing noise and raising sensitivity - Google Patents
Detection apparatus of harmonic signal of photoelectric conversion capable of reducing noise and raising sensitivity Download PDFInfo
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- CN201974478U CN201974478U CN2010206759658U CN201020675965U CN201974478U CN 201974478 U CN201974478 U CN 201974478U CN 2010206759658 U CN2010206759658 U CN 2010206759658U CN 201020675965 U CN201020675965 U CN 201020675965U CN 201974478 U CN201974478 U CN 201974478U
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Abstract
The utility model discloses a detection apparatus of harmonic signal of photoelectric conversion capable of reducing noise and raising sensitivity, comprising a signal filtering amplification unit which is provided with operational amplifiers IC1 and IC2. Pin 1 of the operational amplifiers IC1 is connected with pin 6 of the operational amplifiers IC2 through resistor R5 and is connected with pin 5 of the operational amplifiers IC2 through resistor R6; the other end of resistor R6 is connected with the earth; pin 4 and pin 8 of the operational amplifiers IC2 are respectively connected to pin 4 and pin 8 of the operational amplifiers IC1; and pin 7 of the operational amplifiers IC2 is connected to a voltage-regulator diode D1 and is connected to pin 6 through an adjustable resistor R7. The apparatus could amplify the output signal and control output amplitude of harmonic wave component through resistance of the adjustable resistor R7; the arranged voltage-regulator diode D1 is used for stabilizing the amplitude of the harmonic wave component to ensure no fluctuation of output harmonic wave component signal; and the apparatus has the advantages of low noise and high sensitivity.
Description
Technical field
The utility model relates to a kind of opto-electronic conversion harmonic signal sniffer, especially a kind of opto-electronic conversion harmonic signal sniffer that reduces noise raising sensitivity.
Background technology:
Along with the develop rapidly of optical fiber sensing technology and Networks of Fiber Communications technology, utilize the harmonic wave pick-up unit that the capable and experienced feeble signal that relates in the noise between each sensing passage is extracted, become the research direction and the trend in current field.Existing opto-electronic conversion harmonic signal sniffer is made up of photodiode converts unit, lockin signal treatment circuit (frequency multiplication of phase locked loop unit, phase-locked amplifying unit) and signal filtering amplifying unit, the faint optical signal that photodiode detects converts to behind the electric signal through level cell processing later again, and wherein harmonic component is converted into the analog quantity that can be used for the single-chip microcomputer monitoring.The lockin signal treatment circuit that is adopted is a kind of amplifier that alternating signal is carried out phase sensitive detection, it be with the reference signal of measured signal same frequency and phase place benchmark as a comparison, only to the noise component of (or frequency multiplication), homophase frequently response being arranged with reference signal.Therefore, can suppress useless noise significantly, improve detection signal-to-noise ratio, feeble signal is extracted.But existing signal filtering amplifying unit but can not effectively be handled feeble signal, causes the noise sensitivity big, detection signal in the signal low.
The utility model content:
The utility model is in order to solve the above-mentioned technical matters of existing in prior technology, a kind of opto-electronic conversion harmonic signal sniffer that noise improves sensitivity that reduces to be provided.
Technical solution of the present utility model is: a kind of opto-electronic conversion harmonic signal sniffer that reduces noise raising sensitivity, by the photodiode converts unit, the frequency multiplication of phase locked loop unit, phase-locked amplifying unit and signal filtering amplifying unit are formed, it is characterized in that: described signal filtering amplifying unit is provided with operational amplifier IC1 and IC2, be connected to resistance R 1 and R2 and the capacitor C 2 that is in series with 3 pins of operational amplifier IC1, the other end ground connection of capacitor C 2,1 pin of operational amplifier IC1 and 2 pins join and join by capacitor C 1 and resistance R 2,8 pins of operational amplifier IC1 join with+12V power supply and capacitor C 4, the other end ground connection of capacitor C 4,4 pins of operational amplifier IC1 join the other end ground connection of capacitor C 5 with-12V power supply and capacitor C 5; 1 pin of operational amplifier IC1 joins by 6 pins of resistance R 5 with operational amplifier IC2, be connected to resistance R 6 with 5 pins of operational amplifier IC2, the other end ground connection of resistance R 6,4 pins of operational amplifier IC2,8 pins join with 4 pins, 8 pins of operational amplifier IC1 respectively, and 7 pins of operational amplifier IC2 and voltage stabilizing diode D1 join and join by adjustable resistance R7 and 6 pins.
The utility model can amplify the signal of output and pass through to regulate the resistance of variable resistor R7, the amplitude of control output harmonic wave component, set stabilivolt D1 can be used to the amplitude of steady harmonic component, guarantee that the harmonic component signal of exporting can not produce fluctuation, has low noise, highly sensitive advantage.
Description of drawings:
Fig. 1 is the circuit theory diagrams of the utility model embodiment signal filtering amplifying unit.
Embodiment:
Below in conjunction with description of drawings embodiment of the present utility model.The utility model is the same with prior art, have by the photodiode converts unit, the frequency multiplication of phase locked loop unit, phase-locked amplifying unit and signal filtering amplifying unit are formed, the frequency multiplication of phase locked loop unit can be that CD4046BCM chip and peripheral cell constitute by model, phase-locked amplifying unit can be that AD630ARZ chip and peripheral cell constitute by model, and the signal filtering amplifying unit as shown in Figure 1: be provided with operational amplifier IC1 (NE5532AD) and IC2 (NE5532AD), be connected to resistance R 1 and R2 and the capacitor C 2 that is in series with 3 pins of operational amplifier IC1, the other end ground connection of capacitor C 2,1 pin of operational amplifier IC1 and 2 pins join and join by capacitor C 1 and resistance R 2,8 pins of operational amplifier IC1 join with+12V power supply and capacitor C 4, the other end ground connection of capacitor C 4,4 pins of operational amplifier IC1 join the other end ground connection of capacitor C 5 with-12V power supply and capacitor C 5; 1 pin of operational amplifier IC1 joins by 6 pins of resistance R 5 with operational amplifier IC2, be connected to resistance R 6 with 5 pins of operational amplifier IC2, the other end ground connection of resistance R 6,4 pins of operational amplifier IC2,8 pins join with 4 pins, 8 pins of operational amplifier IC1 respectively, and 7 pins of operational amplifier IC2 and voltage stabilizing diode D1 join and join by adjustable resistance R7 and 6 pins.
Principle of work:
The signal of the 1 pin output of operational amplifier IC1 feeds back to 3 pins through capacitor C 1, resistance R 2, and directly feeds back to 2 pins, by the amplifier feedback processing, filters high fdrequency component wherein at last, and remaining is second harmonic.The second harmonic signal that operational amplifier IC1 is exported is delivered to operational amplifier IC2 through resistance R 5, the signal of operational amplifier 7 pins output feeds back to 6 pins by adjustable resistance R7 again, adjustable resistance R7, resistance R 5 play the effect that feedback is amplified, the signal of output is amplified, by regulating the resistance of R7, can control the amplitude of output harmonic wave component, stabilivolt D1 is used for the amplitude of steady harmonic component, guarantees that the harmonic component of exporting can not produce fluctuation.
Claims (1)
1. one kind can be reduced the opto-electronic conversion harmonic signal sniffer that noise improves sensitivity, by the photodiode converts unit, the frequency multiplication of phase locked loop unit, phase-locked amplifying unit and signal filtering amplifying unit are formed, it is characterized in that: described signal filtering amplifying unit is provided with operational amplifier IC1 and IC2, be connected to resistance R 1 and R2 and the capacitor C 2 that is in series with 3 pins of operational amplifier IC1, the other end ground connection of capacitor C 2,1 pin of operational amplifier IC1 and 2 pins join and join by capacitor C 1 and resistance R 2,8 pins of operational amplifier IC1 join with+12V power supply and capacitor C 4, the other end ground connection of capacitor C 4,4 pins of operational amplifier IC1 join the other end ground connection of capacitor C 5 with-12V power supply and capacitor C 5; 1 pin of operational amplifier IC1 joins by 6 pins of resistance R 5 with operational amplifier IC2, be connected to resistance R 6 with 5 pins of operational amplifier IC2, the other end ground connection of resistance R 6,4 pins of operational amplifier IC2,8 pins join with 4 pins, 8 pins of operational amplifier IC1 respectively, and 7 pins of operational amplifier IC2 and voltage stabilizing diode D1 join and join by adjustable resistance R7 and 6 pins.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206759658U CN201974478U (en) | 2010-12-23 | 2010-12-23 | Detection apparatus of harmonic signal of photoelectric conversion capable of reducing noise and raising sensitivity |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206759658U CN201974478U (en) | 2010-12-23 | 2010-12-23 | Detection apparatus of harmonic signal of photoelectric conversion capable of reducing noise and raising sensitivity |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201974478U true CN201974478U (en) | 2011-09-14 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010206759658U Expired - Fee Related CN201974478U (en) | 2010-12-23 | 2010-12-23 | Detection apparatus of harmonic signal of photoelectric conversion capable of reducing noise and raising sensitivity |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201974478U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106618494A (en) * | 2016-11-30 | 2017-05-10 | 深圳职业技术学院 | PPG pulse wave signal extraction processing system based on phase-locked amplifier |
| CN106872779A (en) * | 2017-03-02 | 2017-06-20 | 北京航空航天大学 | A kind of harmonic source determination methods based on harmonic phase jittering characteristic |
-
2010
- 2010-12-23 CN CN2010206759658U patent/CN201974478U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106618494A (en) * | 2016-11-30 | 2017-05-10 | 深圳职业技术学院 | PPG pulse wave signal extraction processing system based on phase-locked amplifier |
| CN106872779A (en) * | 2017-03-02 | 2017-06-20 | 北京航空航天大学 | A kind of harmonic source determination methods based on harmonic phase jittering characteristic |
| CN106872779B (en) * | 2017-03-02 | 2019-03-29 | 北京航空航天大学 | A kind of harmonic source judgment method based on harmonic phase jittering characteristic |
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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 | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110914 Termination date: 20161223 |