CN201387487Y - Receiver circuit of laser distance meter - Google Patents
Receiver circuit of laser distance meter Download PDFInfo
- Publication number
- CN201387487Y CN201387487Y CN200920023891U CN200920023891U CN201387487Y CN 201387487 Y CN201387487 Y CN 201387487Y CN 200920023891 U CN200920023891 U CN 200920023891U CN 200920023891 U CN200920023891 U CN 200920023891U CN 201387487 Y CN201387487 Y CN 201387487Y
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- circuit
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- resistance
- reverse bias
- photodetector
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Abstract
The utility model relates to a receiver circuit of a laser distance meter. The receiver circuit comprises a reverse bias high-voltage circuit, a first-stage amplifying circuit and an interference signal canceling circuit, wherein the output end of the reverse bias high-voltage circuit is connected with the input end of a photoelectric detector of the first-stage amplifying circuit; the output end of the photoelectric detector is connected with the interference signal canceling circuit; and a compensation circuit is arranged between the reverse bias high-voltage circuit and the first-stage amplifying circuit. When the background light becomes strong, the light current can be increased in a following way, namely, a reverse equivalent resistance is reduced; and a resistor is connected in series to increase the reverse equivalent resistance, so as to reduce the current, therefore, the increased junction capacitance of the photoelectric detector can be caused; in order to prevent the junction capacitance from being increased, a capacitance is connected in parallel to reduce the junction capacitance, so as to lead the distance measuring value to keep stable with the wider background light intensity range, thereby enhancing the capability of background light interference prevention, reducing the affection on the distance measuring precision of a laser ruler by the background light interference, and improving the accuracy of the measuring result.
Description
Technical field
The utility model relates to a kind of laser range finder, specifically, relates to a kind of laser pick-off circuit of laser range finder.
Background technology
V
ASize determine by following formula:
V
A＝3.3*(R105+R107)/R107-(I+i)*R103…………(1)
Numeral 3.3 is supply voltage values of single supply amplifying circuit in the formula (1), the unit volt; I is the photocurrent that is produced by bias light, can think direct current signal; I is the photocurrent that is produced by flashlight, comprises direct current component and AC portion.
When the luminous flux (comprising flashlight and bias light) that receives when the laser pick-off circuit changed, the photocurrent of laser pick-off circuit also changed thereupon, thus the magnitude of voltage V that obtains through first order amplifying circuit
AAlso proportional thereupon variation, scale-up factor is exactly the resistance of transfer resistance R103, is generally 470k Ω.The transfer resistance R103 of corresponding a certain definite resistance, photocurrent is big more, then by formula V as can be known
AMore little.
When photocurrent increases to or during near 3.3* (R105+R107)/(R107*R103), in theory this moment V
ABe 0V, be carried in V
AOn AC signal therefore also can not effectively be converted to voltage signal so that can't obtain being used for the signal of computed range at the output terminal of third stage amplifier.Work as V
ADuring near 0V, though still can obtain distance measuring signal, because that direct current biasing put was low, distance measuring signal is serious distortion, thereby makes the result that finds range produce skew.
Photodetector APD requires very strict to reverse bias voltage, the output of general reverse bias high-tension circuit is controlled by system control chip, the proportional relation of accurate analog quantity DACO level of its size and process digital-to-analog conversion, this voltage is the back biased high pressure of laser pick-off circuit.The size of reverse bias voltage directly has influence on the width of the inner PN junction depletion layer of photodetector APD, thereby has influenced the size of photodetector APD junction capacity, and reverse bias voltage increases, and junction capacity reduces.
Under the constant prerequisite of laser pick-off circuit back biased high pressure, when bias light intensity increased, the luminous power that the laser pick-off circuit receives increased, and the photocurrent of generation also increases.Therefore, the constant situation of voltage drop at photodetector APD two ends flows through electric current and increases, and this reverse equivalent resistance that is equivalent to the laser pick-off circuit diminishes.
Simultaneously, under the constant situation of back biased high pressure, the unexpected increase of photocurrent will destroy the mobile equilibrium of the inner PN junction depletion layer of laser pick-off circuit, depletion layer be broadened, with respect to capacitor discharge.
Thereby the variation of photodetector APD junction capacity will change the distance value skew that signal phase causes measurement.Promptly when bias light increased suddenly, measured value increased thereupon, but reduced gradually subsequently; Otherwise when bias light reduced suddenly, measured value reduced thereupon, but increased gradually subsequently.
The utility model content
Problem to be solved in the utility model is at above problem, provides that a kind of anti-bias light interference performance is strong, measurement result laser range finder receiving circuit accurately.
For achieving the above object, the technical scheme that the utility model adopted is: the laser range finder receiving circuit, comprise reverse bias high-tension circuit, one-level amplifying circuit and undesired signal elimination circuit, the output terminal of described reverse bias high-tension circuit is connected with the input end of the photodetector D100 of one-level amplifying circuit, the output terminal of photodetector D100 is eliminated circuit with undesired signal and is connected, and it is characterized in that: be provided with compensating circuit between described reverse bias high-tension circuit and the one-level amplifying circuit.
The concrete prioritization scheme of compensating circuit, described compensating circuit comprises capacitor C 117 and resistance R 110, described resistance R 110 is connected between the input end of photodetector D100 of the output terminal of reverse bias high-tension circuit and one-level amplifying circuit, and described capacitor C 117 is connected between the output terminal and ground of reverse bias high-tension circuit.
The concrete prioritization scheme of one-level amplifying circuit, described one-level amplifying circuit is by inductance L 101, capacitor C 102, capacitor C 108, capacitor C 114, capacitor C 115, resistance is the transfer resistance R103 of 300k Ω, resistance R 105, resistance R 107, photodetector D100 and operational amplifier IC1 form, transfer resistance R103 and capacitor C 115 are connected in parallel between 1 pin and 4 pin of operational amplifier IC1, signal after 1 pin of operational amplifier IC1 will amplify is exported to the next stage circuit, capacitor C 102, capacitor C 108 and resistance R 107 are connected in parallel between 2 pin and 3 pin of operational amplifier IC1,2 pin ground connection, 3 pin connect power supply through resistance R 105,4 pin of operational amplifier IC1 are eliminated circuit through undesired signal and are met photodetector D100, another termination capacitor C 114 and the resistance R 110 of photodetector D100, another termination inductance L 101 of capacitor C 114, another termination capacitor C 117 of resistance R 110 and the output terminal of reverse bias high-tension circuit, the other end ground connection of capacitor C 117.
The utility model is taked above technical scheme, has the following advantages:
(1) reduces the resistance of transfer resistance, reduced range finding result's skew.
(2) in the middle of photodetector and reverse bias high-tension circuit, insert compensating circuit.When bias light increases, photocurrent increases thereupon, being equivalent to reverse equivalent resistance reduces, the resistance of connecting increases reverse equivalent resistance to reduce electric current, connect after the resistance, the actual reverse bias voltage that is added in the photodetector two ends has reduced, can cause the junction capacity of photodetector to increase like this, for preventing that its junction capacity from increasing, electric capacity in parallel reduces junction capacity, thereby makes distance measure keep stable in than the bias light strength range of broad, has strengthened anti-bias light interference capability, reduced the influence of bias light interference, the accuracy that has improved measurement result to the laser ruler distance accuracy.
The utility model is described in further detail below in conjunction with drawings and Examples.
Description of drawings
Accompanying drawing 2 is the circuit diagram of laser range finder receiving circuit among the utility model embodiment.
Among the figure
1-reverse bias high-tension circuit, 2-one-level amplifying circuit, the 3-second amplifying circuit, the 4-three-stage amplifier, the 5-electric source filter circuit, the 6-undesired signal is eliminated circuit, 7-compensating circuit
Embodiment
Embodiment: as shown in Figure 2, the laser range finder receiving circuit, comprise reverse bias high-tension circuit 1, one-level amplifying circuit 2, second amplifying circuit 3, three-stage amplifier 4, electric source filter circuit 5, undesired signal is eliminated circuit 6 and compensating circuit 7, one-level amplifying circuit 2 is by inductance L 101, capacitor C 102, capacitor C 108, capacitor C 114, capacitor C 115, resistance is the transfer resistance R103 of 300k Ω, resistance R 105, resistance R 107, photodetector D100 and operational amplifier IC1, photodetector D100 are produced by hamamatsu company, model is the APD of Si Apd S2832.
Electric source filter circuit 5 is made up of capacitor C 100, capacitor C 101 and inductance L 100, and electric source filter circuit 5 provides working power for one-level amplifying circuit 2, second amplifying circuit 3 and three-stage amplifier 4.
Undesired signal is eliminated circuit 6 and is made up of capacitor C 106, capacitor C 107 and resistance R 100.
Compensating circuit 7 is made up of capacitor C 117 and resistance R 110.
The transfer resistance R103 of one-level amplifying circuit 2 and capacitor C 115 are connected in parallel between 1 pin and 4 pin of operational amplifier IC1, signal after 1 pin of operational amplifier IC1 will amplify is exported to second amplifying circuit 3, export to three-stage amplifier 4 again, capacitor C 102, capacitor C 108 and resistance R 107 are connected in parallel between 2 pin and 3 pin of operational amplifier IC1,2 pin ground connection, 3 pin connect the output terminal of electric source filter circuit 5 through resistance R 105, the resistance R 100 that 4 pin of operational amplifier IC1 are eliminated circuit 6 through undesired signal meets photodetector D100, the two ends of resistance R 100 are through capacitor C 106 and capacitor C 107 ground connection, another termination capacitor C 114 of photodetector D100 and the resistance R 110 of compensating circuit 7, another termination inductance L 101 of capacitor C 114, another termination capacitor C 117 of resistance R 110 and the output terminal of reverse bias high-tension circuit 1, the other end ground connection of capacitor C 117.
Photodetector D100 is in reverse-bias state under the effect of reverse bias high-tension circuit 1, laser signal is accepted in wait, after laser generator sent laser, photodetector D100 received laser generator and is transmitted into the signal that returns on the object, and this signal intensity is directly proportional with distance.Photodetector D100 receives signal can produce the current signal that is directly proportional with light intensity, this current signal is eliminated circuit 6 through undesired signal, undesired signal is eliminated the jamming incoherent signal signal that circuit 6 is eliminated in the input current signal, only stay useful signal, through one-level amplifying circuit 2 after-current conversion of signals is voltage signal, obtains voltage V
A, voltage V
AAmplify through second amplifying circuit 3 and 4 pairs of voltage signals of three-stage amplifier again, be of moderate size the signal of signal to noise ratio excellence thereby obtain amplitude.
In the middle of photodetector D100 and reverse bias high-tension circuit 1, insert compensating circuit 7, when bias light increases, photocurrent increases thereupon, being equivalent to reverse equivalent resistance reduces, resistance in series R110 increases reverse equivalent resistance and reduces electric current, after the resistance in series R110, the actual reverse bias voltage that is added in photodetector D100 two ends has reduced, can cause photodetector D100 junction capacity to increase like this, for preventing that its junction capacity from increasing, shunt capacitance C117 reduces junction capacity, thereby makes distance measure keep stable in than the bias light strength range of broad.
Claims (3)
1, laser range finder receiving circuit, comprise reverse bias high-tension circuit (1), one-level amplifying circuit (2) and undesired signal elimination circuit (6), the output terminal of described reverse bias high-tension circuit (1) is connected with the input end of the photodetector D100 of one-level amplifying circuit (2), the output terminal of photodetector D100 is eliminated circuit (6) with undesired signal and is connected, and it is characterized in that: be provided with compensating circuit (7) between described reverse bias high-tension circuit (1) and the one-level amplifying circuit (2).
2, laser range finder receiving circuit as claimed in claim 1, it is characterized in that: described compensating circuit (7) comprises capacitor C 117 and resistance R 110, described resistance R 110 is connected between the input end of photodetector D100 of the output terminal of reverse bias high-tension circuit (1) and one-level amplifying circuit (2), and described capacitor C 117 is connected between the output terminal and ground of reverse bias high-tension circuit (1).
3, laser range finder receiving circuit as claimed in claim 1 or 2, it is characterized in that: described one-level amplifying circuit (2) is by inductance L 101, capacitor C 102, capacitor C 108, capacitor C 114, capacitor C 115, resistance is the transfer resistance R103 of 300k Ω, resistance R 105, resistance R 107, photodetector D100 and operational amplifier IC1 form, transfer resistance R103 and capacitor C 115 are connected in parallel between 1 pin and 4 pin of operational amplifier IC1, signal after 1 pin of operational amplifier IC1 will amplify is exported to the next stage circuit, capacitor C 102, capacitor C 108 and resistance R 107 are connected in parallel between 2 pin and 3 pin of operational amplifier IC1,2 pin ground connection, 3 pin connect power supply through resistance R 105,4 pin of operational amplifier IC1 are eliminated circuit (6) through undesired signal and are met photodetector D100, another termination capacitor C 114 and the resistance R 110 of photodetector D100, another termination inductance L 101 of capacitor C 114, another termination capacitor C 117 of resistance R 110 and the output terminal of reverse bias high-tension circuit (1), the other end ground connection of capacitor C 117.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200920023891U CN201387487Y (en) | 2009-03-23 | 2009-03-23 | Receiver circuit of laser distance meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200920023891U CN201387487Y (en) | 2009-03-23 | 2009-03-23 | Receiver circuit of laser distance meter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201387487Y true CN201387487Y (en) | 2010-01-20 |
Family
ID=41580023
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200920023891U Expired - Fee Related CN201387487Y (en) | 2009-03-23 | 2009-03-23 | Receiver circuit of laser distance meter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201387487Y (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103151988A (en) * | 2013-02-01 | 2013-06-12 | 四川虹视显示技术有限公司 | Self-adaptive amplifying circuit and fish detector based thereon |
| CN103457552A (en) * | 2013-08-30 | 2013-12-18 | 奇瑞汽车股份有限公司 | Amplification circuit for laser distance measuring receiving system |
| CN104483675A (en) * | 2014-12-18 | 2015-04-01 | 扬州天目光电科技有限公司 | Self-adaptive laser ranging device and self-adaptive laser ranging method |
| CN109471009A (en) * | 2017-09-08 | 2019-03-15 | 科大国盾量子技术股份有限公司 | Bias current value detection circuit and single-photon detector intensity light attack detection circuit, method |
-
2009
- 2009-03-23 CN CN200920023891U patent/CN201387487Y/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103151988A (en) * | 2013-02-01 | 2013-06-12 | 四川虹视显示技术有限公司 | Self-adaptive amplifying circuit and fish detector based thereon |
| CN103151988B (en) * | 2013-02-01 | 2015-12-23 | 四川虹视显示技术有限公司 | Self adaptation amplifying circuit and the fish detector based on this circuit |
| CN103457552A (en) * | 2013-08-30 | 2013-12-18 | 奇瑞汽车股份有限公司 | Amplification circuit for laser distance measuring receiving system |
| CN103457552B (en) * | 2013-08-30 | 2016-06-01 | 奇瑞汽车股份有限公司 | The amplification circuit of a kind of laser ranging receiving system |
| CN104483675A (en) * | 2014-12-18 | 2015-04-01 | 扬州天目光电科技有限公司 | Self-adaptive laser ranging device and self-adaptive laser ranging method |
| CN109471009A (en) * | 2017-09-08 | 2019-03-15 | 科大国盾量子技术股份有限公司 | Bias current value detection circuit and single-photon detector intensity light attack detection circuit, method |
| CN109471009B (en) * | 2017-09-08 | 2023-11-03 | 科大国盾量子技术股份有限公司 | Bias value detection circuit and single photon detector strong light attack detection circuit and method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100120 Termination date: 20110323 |