CN205452318U - Balanced photoelectric detector - Google Patents
Balanced photoelectric detector Download PDFInfo
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- CN205452318U CN205452318U CN201520986699.3U CN201520986699U CN205452318U CN 205452318 U CN205452318 U CN 205452318U CN 201520986699 U CN201520986699 U CN 201520986699U CN 205452318 U CN205452318 U CN 205452318U
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- photodiode
- resistance
- voltage
- amplifier
- instrument amplifier
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Abstract
The utility model discloses a balanced photoelectric detector locates the electric current difference I3 who obtains through the photodiode connected node who gathers two series connections, and turn into voltage with it, enlarge back output to this voltage. The utility model discloses a make two photodiode's offset voltage adjustable, at the debugging in -process, two photodiode's of dynamic adjustment offset voltage to it is unanimous to reach two photodiode response coefficients, and then reaches balanced detector measuring purpose, the utility model discloses simple structure, it is with low costs.
Description
Technical field
This utility model belongs to field of photodetectors, especially relates to a kind of balance photodetector.
Background technology
Balance photodetector in conventional detection system needs to use the photodetector of a pair performance symmetry, it is first necessary to select the electronic devices and components that performance is symmetrical, this allows for designing a full symmetric balance photodetector difficulty, how to design a kind of simple in construction, avoids owing to the asymmetric photodetector to photoelectric conversion process and photoelectric current conversion amplification process introducing amplification noise of device becomes the problem of those skilled in the art's research.
Utility model content
In view of this, this utility model is directed to a kind of simple in construction, and can avoid the asymmetric balance photodetector changing amplification process introducing amplification noise to photoelectric conversion process and photoelectric current due to device.
For reaching above-mentioned purpose, the technical solution of the utility model is achieved in that
A kind of balance photodetector, including the photo-signal acquisition module being linked in sequence, current signal conversion module and voltage signal output module；Described photo-signal acquisition module includes photodiode D1 and the photodiode D2 that two classifications, model are the most identical, the negative pole of described photodiode D1 connects adjustable positive bias voltage, photodiode D1 positive pole is connected with photodiode D2 negative pole, described photodiode D2 positive pole connects adjustable negative bias voltage, and described photodiode D1 positive pole is connected at node the current differential I3 obtaining two series connection photodiodes with described photodiode D2 negative pole；Described current signal conversion module includes the trans-impedance amplifier U3 that difference current signal I3 is converted into voltage signal, and the operational amplifier U4 amplified this voltage signal further；The input of the second road SMA2 of voltage signal output module is connected with the outfan of described operational amplifier.
Described current signal conversion module also includes the first instrument amplifier U1 that the photoelectric current that photodiode D1 produces is converted into single channel monitoring voltage signal, and the outfan of described first instrument amplifier U1 is connected with the input of first via SMA1 of described voltage signal output module；Described current signal conversion module also includes the second instrument amplifier U5 that the photoelectric current that photodiode D2 produces is converted into single channel monitoring voltage signal, and the outfan of described second instrument amplifier U5 is connected with the input of the 3rd road SMA3 of described voltage signal output module.
It is connected current-limiting resistance R1 between the negative pole of described photodiode D1 and adjustable positive bias voltage, between the positive pole of described photodiode D2 and adjustable negative bias voltage, is connected current-limiting resistance R13；Described positive bias voltage is by the first linear malleation manostat U2 and peripheral circuit thereof: electric capacity C2, electric capacity C3, resistance R3 and adjustable resistance R4 provide；Negative bias voltage is by the second linear negative pressure manostat U6 and peripheral circuit thereof: adjustable resistance R14, resistance R15, electric capacity C13 and electric capacity C12 provide.
Described trans-impedance amplifier is OPA657U, described operational amplifier is THS3091, it is provided with resistance R7 between end of oppisite phase and the output point of described trans-impedance amplifier of described operational amplifier, it is provided with the resistance R9 being connected in series and variable resistance R10 between positive terminal and the ground of described operational amplifier, between end of oppisite phase and the outfan of described operational amplifier, bridges resistance R5.
Described first instrument amplifier U1 is INA126U and peripheral circuit thereof: resistance R2, and described first instrument amplifier U5 is INA126U and peripheral circuit thereof: resistance R12；The in-phase end of described first instrument amplifier U1 connects described adjustable positive bias voltage, and the end of oppisite phase of described first instrument amplifier U1 connects the negative pole of described photodiode D1；The end of oppisite phase of described second instrument amplifier U2 connects described adjustable negative bias voltage, and the in-phase end of described second instrument amplifier U1 connects the positive pole of described photodiode D2.
It is provided with filter capacitor C1 between first via SMA1 and the outfan of described first instrument amplifier U1 of described voltage output module, between the 3rd road SMA3 and the outfan of described second instrument amplifier U5 of described voltage output module, is provided with filter capacitor C10.
Said two photodiode characteristic electron is identical.
Relative to prior art, balance photodetector described in the utility model has the advantage that
(1) balance photodetector described in the utility model is adjustable by the bias voltage making two photodiodes, during debugging, can dynamically regulate the bias voltage of two photodiodes, consistent to reach two photodiode response coefficients, and then reach the purpose that balanced detector is measured；Thus avoid the work making a pair symmetrical detector, it also avoid owing to the asymmetric of device introduces amplify noise to photoelectric conversion process and photoelectric current conversion amplification process simultaneously, and this utility model simple in construction, low cost；
(2) current signal of each photodiode is converted to voltage signal output after instrument amplifier amplifies and can show single channel voltage, can also monitor the failure condition of this road device, convenient monitoring simultaneously；
(3) adjustable positive bias voltage and negative bias voltage provide circuit to use low noise, micropower linear regulator, simple in construction, low in energy consumption, noise is little；
(4) trans-impedance amplifier is OPA657U, the advantage such as the high gain-bandwidth itself with 1.6GHz is long-pending, the input bias current of the input offset voltage of ± 0.25mV, 2pA and 70mA High Output Current；Operational amplifier is THS3091, itself have the high pressure Slew Rate of 7300V/ μ s, the response of 270MHz wide bandwidth, can provide ± 250mA drives electric current and ± 5V the advantage such as to power to ± 5V wide power voltage, the two chip periphery circuit of selection is few, simple in construction, low cost, stable performance；
(5) instrument amplifier selection INA126U advantage: the series of advantages such as the low drifting, low-power consumption, high cmrr, wide power supply district and the small size that itself have, what it utilized is the differential small-signal characteristic that is superimposed upon on bigger common-mode signal, common-mode signal can be removed, and differential signal is amplified simultaneously；
(6) setting of the filter capacitor between voltage output module and each amplifier, improves stability and the reliability of output voltage；
(7) two photodiode characteristic electrons are identical, convenient regulation, save the debugging time, improve production efficiency.
Accompanying drawing explanation
The accompanying drawing constituting a part of the present utility model is further appreciated by of the present utility model for providing, and schematic description and description of the present utility model is used for explaining this utility model, is not intended that improper restriction of the present utility model.In the accompanying drawings:
Fig. 1 is circuit block diagram of the present utility model；
Fig. 2 is circuit connection diagram of the present utility model；
Fig. 3 is circuit theory diagrams of the present utility model.
Detailed description of the invention
It should be noted that in the case of not conflicting, the embodiment in this utility model and the feature in embodiment can be mutually combined.
In description of the present utility model, it will be appreciated that, term " " center ", " longitudinally ", " laterally ", on " ", D score, " front ", " afterwards ", " left ", " right ", " vertically ", " level ", " push up ", " end ", " interior ", orientation or the position relationship of the instruction such as " outward " are based on orientation shown in the drawings or position relationship, it is for only for ease of description this utility model and simplifies description, rather than indicate or imply that the device of indication or element must have specific orientation, with specific azimuth configuration and operation, therefore it is not intended that to restriction of the present utility model.Additionally, term " first ", " second " etc. are only used for describing purpose, and it is not intended that indicate or imply relative importance or the implicit quantity indicating indicated technical characteristic.Thus, the feature defining " first ", " second " etc. can express or implicitly include one or more this feature.In description of the present utility model, except as otherwise noted, " multiple " are meant that two or more.
In description of the present utility model, it should be noted that unless otherwise clearly defined and limited, term " is installed ", " being connected ", " connection " should be interpreted broadly, and connects for example, it may be fixing, it is also possible to be to removably connect, or be integrally connected；Can be to be mechanically connected, it is also possible to be electrical connection；Can be to be joined directly together, it is also possible to be indirectly connected to by intermediary, can be the connection of two element internals.For the ordinary skill in the art, above-mentioned term concrete meaning in this utility model can be understood by concrete condition.
Describe this utility model below with reference to the accompanying drawings and in conjunction with the embodiments in detail.
Such as Fig. 1,2,3, this utility model introduces one balance photodetector, including the photo-signal acquisition module 3 being linked in sequence, current signal conversion module 4, voltage signal output module 5；Described photo-signal acquisition module 3 includes photodiode D1 and the photodiode D2 that two classifications, model are identical, negative pole at photodiode D1 connects adjustable positive bias voltage 1, photodiode D1 positive pole is connected with photodiode D2 negative pole, connect adjustable negative bias voltage 2 at photodiode D2 positive pole, utilize Kirchhoff's current law (KCL) to obtain the current differential I3 of two series connection photodiodes at node A；Current signal conversion module 4 includes that the photoelectric current that first instrument amplifier U1, the photodiode D2 of the voltage signal that the photoelectric current of photodiode D1 generation is converted into single channel monitoring produce is converted into the second instrument amplifier U5 of the voltage signal of single channel monitoring, difference current signal I3 is converted into the trans-impedance amplifier U3 of voltage signal, then the operational amplifier U4 amplifying this voltage signal；The input of voltage signal output module 5 is coupled with operational amplifier U4, first instrument amplifier U1 and the outfan of second instrument amplifier U5.
Such as Fig. 3, two photodiodes of this utility model series connection should select the PIN photodiode that two characteristic electrons are identical, to ensure that their response coefficient, response speed one cause measurement result accurate as far as possible.The bias voltage of photodiode D1 is given by U2 (MIC5205), and the voltage of U2 output is an adjustable voltage, and regulation R4 can change OUT terminal output voltage, and adjustable extent is 0 8V.The electric current flowing through D1 namely flows through the electric current of R1, and the voltage of R1 is gathered by U1 positive terminal and end of oppisite phase, can control the amplification of first instrument amplifier U1 by the size controlling R2 resistance thus control the amplification of SMA1 output voltage.The bias voltage of photodiode D2 is given by U6 (LT1964), and the voltage of U6 output is an adjustable voltage, and regulation R14 can change OUT terminal output voltage, and adjustable extent is-8 0V.The electric current flowing through D2 namely flows through the electric current of R13, and the voltage of R13 is gathered by U6 positive terminal and end of oppisite phase, can control the amplification of second instrument amplifier U5 by the size controlling R12 resistance thus control the amplification of SMA3 output voltage.
The current difference signal of D1, D2 flows to the end of oppisite phase of the trans-impedance amplifier being made up of U3 (OPA657U) and peripheral circuit, C4, C5, C7 and C8 are the filter capacitor of U3, change R11 resistance, scalable is changed into the amplification of voltage by electric current, voltage signal after conversion receives the rp-op amp being made up of U4 (THS3091) and peripheral circuit, amplification is-(R5/R7), the forward bias current of R9, R10 scalable U4.Voltage signal after being amplified by rp-op amp is exported by SMA2.
Because two photodiode Electronic Performances can not be completely the same, the bias voltage so making two photodiodes is adjustable, during debugging, can dynamically regulate the bias voltage of two photodiodes, unanimously reach balanced detector measurement effect reaching two photodiode response coefficients.
Detector is a critically important parameter without optical noise, during debugging, observing U2 waveform with oscillograph, scalable R10 makes waveform be in the intermediate value of maximum noise and minimal noise, as long as the noise of power supply is sufficiently small, the balanced detector of design the least without optical noise.
The foregoing is only preferred embodiment of the present utility model; not in order to limit this utility model; all within spirit of the present utility model and principle, any modification, equivalent substitution and improvement etc. made, within should be included in protection domain of the present utility model.
Claims (8)
1. a balance photodetector, it is characterised in that: include photo-signal acquisition module, current signal conversion module and the voltage signal output module being linked in sequence；Described photo-signal acquisition module includes photodiode D1 and the photodiode D2 that two classifications, model are the most identical, the negative pole of described photodiode D1 connects adjustable positive bias voltage, photodiode D1 positive pole is connected with photodiode D2 negative pole, described photodiode D2 positive pole connects adjustable negative bias voltage, and described photodiode D1 positive pole is connected at node the current differential I3 obtaining two series connection photodiodes with described photodiode D2 negative pole；Described current signal conversion module includes the trans-impedance amplifier U3 that difference current signal I3 is converted into voltage signal, and the operational amplifier U4 amplified this voltage signal further；The input of the second road SMA2 of voltage signal output module is connected with the outfan of described operational amplifier.
Balance photodetector the most according to claim 1, it is characterized in that: described current signal conversion module also includes being converted into the photoelectric current that photodiode D1 produces the first instrument amplifier U1 of single channel monitoring voltage signal, and the outfan of described first instrument amplifier U1 is connected with the input of first via SMA1 of described voltage signal output module；Described current signal conversion module also includes the second instrument amplifier U5 that the photoelectric current that photodiode D2 produces is converted into single channel monitoring voltage signal, and the outfan of described second instrument amplifier U5 is connected with the input of the 3rd road SMA3 of described voltage signal output module.
Balance photodetector the most according to claim 1, it is characterized in that: be connected current-limiting resistance R1 between the negative pole of described photodiode D1 and adjustable positive bias voltage, between the positive pole of described photodiode D2 and adjustable negative bias voltage, be connected current-limiting resistance R13；Described positive bias voltage is by the first linear malleation manostat U2 and peripheral circuit thereof: electric capacity C2, electric capacity C3, resistance R3 and adjustable resistance R4 provide；Negative bias voltage is by the second linear negative pressure manostat U6 and peripheral circuit thereof: adjustable resistance R14, resistance R15, electric capacity C13 and electric capacity C12 provide.
Balance photodetector the most according to claim 1, it is characterized in that: described trans-impedance amplifier is OPA657U, described operational amplifier is THS3091, it is provided with resistance R7 between end of oppisite phase and the output point of described trans-impedance amplifier of described operational amplifier, it is provided with the resistance R9 being connected in series and variable resistance R10 between positive terminal and the ground of described operational amplifier, between end of oppisite phase and the outfan of described operational amplifier, bridges resistance R5.
Balance photodetector the most according to claim 2, it is characterised in that: described first instrument amplifier U1 is INA126U and peripheral circuit thereof: resistance R2, and described first instrument amplifier U5 is INA126U and peripheral circuit thereof: resistance R12；The in-phase end of described first instrument amplifier U1 connects described adjustable positive bias voltage, and the end of oppisite phase of described first instrument amplifier U1 connects the negative pole of described photodiode D1；The end of oppisite phase of described second instrument amplifier U2 connects described adjustable negative bias voltage, and the in-phase end of described second instrument amplifier U1 connects the positive pole of described photodiode D2.
6. according to the balance photodetector described in claim 2 or 5, it is characterized in that: be provided with filter capacitor C1 between first via SMA1 and the outfan of described first instrument amplifier U1 of described voltage output module, between the 3rd road SMA3 and the outfan of described second instrument amplifier U5 of described voltage output module, be provided with filter capacitor C10.
7. according to the balance photodetector described in any one of claim 1-5, it is characterised in that: said two photodiode characteristic electron is identical.
Balance photodetector the most according to claim 6, it is characterised in that: said two photodiode characteristic electron is identical.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520986699.3U CN205452318U (en) | 2015-12-01 | 2015-12-01 | Balanced photoelectric detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520986699.3U CN205452318U (en) | 2015-12-01 | 2015-12-01 | Balanced photoelectric detector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205452318U true CN205452318U (en) | 2016-08-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520986699.3U Expired - Fee Related CN205452318U (en) | 2015-12-01 | 2015-12-01 | Balanced photoelectric detector |
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| Country | Link |
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| CN (1) | CN205452318U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110672203A (en) * | 2019-09-05 | 2020-01-10 | 山西大学 | Balanced photodetector |
| US11118964B2 (en) | 2019-08-21 | 2021-09-14 | Ut-Battelle, Llc | Balanced light detector |
-
2015
- 2015-12-01 CN CN201520986699.3U patent/CN205452318U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11118964B2 (en) | 2019-08-21 | 2021-09-14 | Ut-Battelle, Llc | Balanced light detector |
| US11561130B2 (en) | 2019-08-21 | 2023-01-24 | Ut-Battelle, Llc | Balanced light detector |
| US12000732B2 (en) | 2019-08-21 | 2024-06-04 | Ut-Battelle, Llc | Balanced light detector |
| CN110672203A (en) * | 2019-09-05 | 2020-01-10 | 山西大学 | Balanced photodetector |
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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: 20160810 Termination date: 20181201 |
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| CF01 | Termination of patent right due to non-payment of annual fee |