CN204405840U - A kind of high precision distance detector of double channel data acquisition - Google Patents
A kind of high precision distance detector of double channel data acquisition Download PDFInfo
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- CN204405840U CN204405840U CN201520103217.5U CN201520103217U CN204405840U CN 204405840 U CN204405840 U CN 204405840U CN 201520103217 U CN201520103217 U CN 201520103217U CN 204405840 U CN204405840 U CN 204405840U
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Abstract
The utility model discloses a kind of high precision distance detector of double channel data acquisition, it is characterized in that: comprise microprocessor and connected first low-pass filter, second low-pass filter, microprocessor is connected with PLL phase lock circuitry, PLL phase lock circuitry comprises local oscillation signal output terminal and the main signal output part that shakes, laser transmission circuit is exported in PLL phase lock circuitry local oscillation signal one tunnel after modulation, electric mixting circuit is exported on another road, PLL phase lock circuitry master shake signal output part one tunnel through modulation after export to diode receiving circuit, electric mixting circuit is also exported on another road, electricity mixting circuit is connected with the first low-pass filter, diode receiving circuit is connected with trans-impedance amplifier, trans-impedance amplifier is connected with the second low-pass filter.Stadimeter of the present utility model adopts double channel data acquisition structure, the local oscillation signal of stadimeter, main shake signal and echoed signal when mixing and intrinsic error signal offset, substantially increase measuring accuracy.
Description
Technical field
The utility model relates to a kind of laser ranging system, especially relates to a kind of high precision distance detector of double channel data acquisition.
Background technology
Laser range finder is widely used in the fields such as building, indoor decoration because measuring accuracy is high, easy to use.General laser ranging system selects avalanche photodide to be used as receiving the reception components and parts of folded light beam mostly.Avalanche photodide, because of its intrinsic electrical specification, when change of external conditions, such as when temperature, light intensity change, can produce electrical quantity change, the such as change of multiplication factor, phase place, thus cause the reduction of measuring accuracy.Meanwhile, the circuit aging reduction waiting other reasons also can cause measuring accuracy.For this reason, there is the corresponding measure of research and development both at home and abroad, reduce this measuring error.Traditional way increases calibrating installation exactly, one utilizes reflecting optics, a part of utilizing emitted light is passed through machine internal fixtion distance back reflection in another set of avalanche photodide receiving system, measurement data and fixed range relatively after, generate corrected parameter, revise the measurement data of tested distance again by this parameter, thus improve measuring accuracy.Another kind is, by the error signal that produces because of avalanche photodide and circuit after ovennodulation, launches with laser, after being received by avalanche photodide, when mixing and intrinsic error signal offset, thus improve precision.
Utility model content
Technical problem to be solved in the utility model is for above-mentioned deficiency of the prior art, a kind of high precision distance detector of double channel data acquisition is provided, stadimeter of the present utility model adopts double channel data acquisition structure, the local oscillation signal that the PLL phase lock circuitry of stadimeter produces and the main signal that shakes are offset with intrinsic error signal when mixing, thus raising precision.Echoed signal is carried out by trans-impedance amplifier after optical mixing in diode receiving circuit, and low-pass filter obtains measuring difference frequency signal input microprocessor, revises this measurement data, further increase measuring accuracy with corrected parameter.
For solving the problems of the technologies described above, the technical solution adopted in the utility model is: a kind of high precision distance detector of double channel data acquisition, it is characterized in that: the first low-pass filter comprising microprocessor and be connected with described microprocessor input, second low-pass filter, described output end of microprocessor is connected with PLL phase lock circuitry, described PLL phase lock circuitry output terminal comprises local oscillation signal output terminal and the main signal output part that shakes, laser transmission circuit is exported in described PLL phase lock circuitry local oscillation signal output terminal one tunnel after modulation, electric mixting circuit is exported on another road, described PLL phase lock circuitry master shake signal output part one tunnel through modulation after export to diode receiving circuit, electric mixting circuit is also exported on another road, described electric mixting circuit output terminal is connected with the first low-pass filter, described diode receiving circuit output terminal is connected with trans-impedance amplifier, described trans-impedance amplifier output terminal is connected with the second low-pass filter.
The high precision distance detector of above-mentioned a kind of double channel data acquisition, is characterized in that: described microprocessor includes 2 A/D sampling kernels.
The high precision distance detector of above-mentioned a kind of double channel data acquisition, is characterized in that: described PLL phase lock circuitry is the circuit based on CDCE925 chip.
The high precision distance detector of above-mentioned a kind of double channel data acquisition, it is characterized in that: described electric mixting circuit comprises triode Q1, described triode Q1 base stage and resistance R2 one end, R7 one end connects, described resistance R2 other end ground connection, the described resistance R7 other end is local oscillation signal input end, described triode Q1 emitter-base bandgap grading and resistance R1 one end, R6 one end connects, described resistance R1 other end ground connection, the described resistance R6 other end is the main signal input part that shakes, described triode Q1 collector connects 5V power supply by resistance R4, described triode Q1 collector is also by the electric capacity C5 of series connection, resistance R3 is connected with operational amplifier U2B end of oppisite phase, operational amplifier U2B in-phase end and resistance R11, the low-pass filter circuit of C9 composition connects, electric capacity C7 and resistance R9 is also parallel with between described operational amplifier U2B end of oppisite phase and output terminal, one A/D model calling of described operational amplifier U2B output terminal and microprocessor.
The high precision distance detector of above-mentioned a kind of double channel data acquisition, it is characterized in that: described laser transmission circuit comprises triode Q3, described triode Q3 collector is connected with inductance L 6 one end, described triode Q3 base stage is connected with resistance R58 one end, described triode Q3 emitter-base bandgap grading is connected with resistance R59 one end, the other end of described inductance L 6 is connected with light emitting diode LD1 negative pole and is local oscillation signal input end, the described resistance R58 other end is connected with operational amplifier U3 output terminal, described operational amplifier U3 end of oppisite phase be connected electric capacity C55 between output terminal, described operational amplifier U3 in-phase end is connected with power supply by resistance R54, described operational amplifier U3 in-phase end also with triode Q2 collector, resistance R56 one end connects, the described resistance R56 other end and triode Q2 emitter grounding, described triode Q2 base stage is connected with resistance R49.
The high precision distance detector of above-mentioned a kind of double channel data acquisition, it is characterized in that: the resistance R1 that described diode receiving circuit comprises avalanche diode D1 and is connected with D1, the described resistance R1 other end is connected with the end of oppisite phase of operational amplifier U1A, parallel resistance R6 and C1 between the end of oppisite phase of described operational amplifier U1A and output terminal, the in-phase end of described operational amplifier U1A connects trans-impedance amplifier, described trans-impedance amplifier comprises the resistance R2 be connected with 5V power supply, the resistance R12 be in parallel be connected with the resistance R2 other end and electric capacity C8, the output terminal of described operational amplifier U1A is connected with the resistance R5 be in parallel and electric capacity C10 by resistance R4, the output terminal of described operational amplifier U1A is also by the resistance R3 of series connection, C5 is connected with the end of oppisite phase of operational amplifier U2B, the end of oppisite phase of described operational amplifier U2B be connected parallel resistance R9 and electric capacity C7 between output terminal, the output terminal of described operational amplifier U2B and the 2nd A/D model calling of microprocessor.
The utility model compared with prior art has the following advantages:
Stadimeter of the present utility model adopts double channel data acquisition structure, and the local oscillation signal that the PLL phase lock circuitry of stadimeter produces and the main signal that shakes are offset with intrinsic error signal when mixing, thus raising precision.Echoed signal is carried out by trans-impedance amplifier after optical mixing in diode receiving circuit, and low-pass filter obtains measuring difference frequency signal input microprocessor, revises this measurement data, further increase measuring accuracy with corrected parameter.
Below by drawings and Examples, the technical solution of the utility model is described in further detail.
Accompanying drawing explanation
Fig. 1 is double channel data acquisition stadimeter structured flowchart of the present utility model;
Fig. 2 is PLL phase lock circuitry schematic diagram of the present utility model;
Fig. 3 is electric mixting circuit schematic diagram of the present utility model;
Fig. 4 is laser transmission circuit schematic diagram of the present utility model;
Fig. 5 is diode receiving circuit schematic diagram of the present utility model.
Embodiment
As shown in Figure 1, a kind of high precision distance detector of double channel data acquisition, it is characterized in that: the first low-pass filter 2 comprising microprocessor 1 and be connected with described microprocessor 1 input end, second low-pass filter 3, described microprocessor 1 output terminal is connected with PLL phase lock circuitry 4, described PLL phase lock circuitry 4 output terminal comprises local oscillation signal output terminal and the main signal output part that shakes, laser transmission circuit 7 is exported in described PLL phase lock circuitry 4 local oscillation signal output terminal one tunnel after modulation, electric mixting circuit 5 is exported on another road, diode receiving circuit 8 is exported in main signal output part one tunnel that shakes of described PLL phase lock circuitry 4 after modulation, electric mixting circuit 5 is also exported on another road, described electric mixting circuit 5 output terminal is connected with the first low-pass filter 2, described diode receiving circuit 8 output terminal is connected with trans-impedance amplifier 6, described trans-impedance amplifier 6 output terminal is connected with the second low-pass filter 3.
Described microprocessor 1 includes 2 A/D sampling kernels.
As shown in Figure 2, described PLL phase lock circuitry 4 is the circuit based on CDCE925 chip.
As shown in Figure 3, described electric mixting circuit 5 comprises triode Q1, described triode Q1 base stage and resistance R2 one end, R7 one end connects, described resistance R2 other end ground connection, the described resistance R7 other end is local oscillation signal input end, described triode Q1 emitter-base bandgap grading and resistance R1 one end, R6 one end connects, described resistance R1 other end ground connection, the described resistance R6 other end is the main signal input part that shakes, described triode Q1 collector connects 5V power supply by resistance R4, described triode Q1 collector is also by the electric capacity C5 of series connection, resistance R3 is connected with operational amplifier U2B end of oppisite phase, operational amplifier U2B in-phase end and resistance R11, the low-pass filter circuit of C9 composition connects, electric capacity C7 and resistance R9 is also parallel with between described operational amplifier U2B end of oppisite phase and output terminal, one A/D model calling of described operational amplifier U2B output terminal and microprocessor 1.
As shown in Figure 4, described laser transmission circuit 7 comprises triode Q3, described triode Q3 collector is connected with inductance L 6 one end, described triode Q3 base stage is connected with resistance R58 one end, described triode Q3 emitter-base bandgap grading is connected with resistance R59 one end, the other end of described inductance L 6 is connected with light emitting diode LD1 negative pole and is local oscillation signal input end, the described resistance R58 other end is connected with operational amplifier U3 output terminal, described operational amplifier U3 end of oppisite phase be connected electric capacity C55 between output terminal, described operational amplifier U3 in-phase end is connected with power supply by resistance R54, described operational amplifier U3 in-phase end also with triode Q2 collector, resistance R56 one end connects, the described resistance R56 other end and triode Q2 emitter grounding, described triode Q2 base stage is connected with resistance R49.
As shown in Figure 5, the resistance R1 that described diode receiving circuit 8 comprises avalanche diode D1 and is connected with D1, the described resistance R1 other end is connected with the end of oppisite phase of operational amplifier U1A, parallel resistance R6 and C1 between the end of oppisite phase of described operational amplifier U1A and output terminal, the in-phase end of described operational amplifier U1A connects trans-impedance amplifier 6, described trans-impedance amplifier 6 comprises the resistance R2 be connected with 5V power supply, the resistance R12 be in parallel be connected with the resistance R2 other end and electric capacity C8, the output terminal of described operational amplifier U1A is connected with the resistance R5 be in parallel and electric capacity C10 by resistance R4, the output terminal of described operational amplifier U1A is also by the resistance R3 of series connection, C5 is connected with the end of oppisite phase of operational amplifier U2B, the end of oppisite phase of described operational amplifier U2B be connected parallel resistance R9 and electric capacity C7 between output terminal, the output terminal of described operational amplifier U2B and the 2nd A/D model calling of microprocessor 1.
In the present embodiment, microprocessor includes 2 A/D sampling kernels, can carry out sampling to two-way difference frequency signal simultaneously.Microprocessor plays phase demodulation effect simultaneously, can compare two paths of signals and calculate distance value.PLL phase lock circuitry can export the local oscillation signal of difference fixed frequency and the main signal that shakes by Microprocessor S3C44B0X.Laser emission is exported in local oscillation signal one tunnel after modulation, and electric mixting circuit is exported on another road.Avalanche photodide is exported in main signal one tunnel that shakes after modulation, and electric mixting circuit is also exported on another road, and electric mixting circuit carries out mixing to local oscillation signal and the main signal that shakes and obtains with reference to difference frequency signal.Electricity mixting circuit inputs to microprocessor A/D thief hatch by exporting local oscillation signal through the first low-pass filter circuit after signal mixing with the reference difference frequency signal of the main signal that shakes.After echoed signal carries out optical mixing in diode receiving circuit, obtain measuring difference frequency signal with main signal mixing of shaking, transfer current signal to voltage signal by trans-impedance amplifier, the second low-pass filter obtains measuring another A/D thief hatch of difference frequency signal input microprocessor.The local oscillation signal that the PLL phase lock circuitry of stadimeter produces and the main signal that shakes are offset with intrinsic error signal when mixing, thus raising precision.Echoed signal is carried out by trans-impedance amplifier after optical mixing in diode receiving circuit, and low-pass filter obtains measuring difference frequency signal input microprocessor, revises this measurement data, further increase measuring accuracy with corrected parameter.
The above; it is only preferred embodiment of the present utility model; not the utility model is imposed any restrictions; every above embodiment is done according to the utility model technical spirit any simple modification, change and equivalent structure change, all still belong in the protection domain of technical solutions of the utility model.
Claims (6)
1. the high precision distance detector of a double channel data acquisition, it is characterized in that: the first low-pass filter (2) comprising microprocessor (1) and be connected with described microprocessor (1) input end, second low-pass filter (3), described microprocessor (1) output terminal is connected with PLL phase lock circuitry (4), described PLL phase lock circuitry (4) output terminal comprises local oscillation signal output terminal and the main signal output part that shakes, laser transmission circuit (7) is exported in described PLL phase lock circuitry (4) local oscillation signal output terminal one tunnel after modulation, electric mixting circuit (5) is exported on another road, diode receiving circuit (8) is exported in main signal output part one tunnel that shakes of described PLL phase lock circuitry (4) after modulation, electric mixting circuit (5) is also exported on another road, described electric mixting circuit (5) output terminal is connected with the first low-pass filter (2), described diode receiving circuit (8) output terminal is connected with trans-impedance amplifier (6), described trans-impedance amplifier (6) output terminal is connected with the second low-pass filter (3).
2. according to the high precision distance detector of a kind of double channel data acquisition according to claim 1, it is characterized in that: described microprocessor (1) includes 2 A/D sampling kernels.
3. according to the high precision distance detector of a kind of double channel data acquisition according to claim 1, it is characterized in that: described PLL phase lock circuitry (4) is the circuit based on CDCE925 chip.
4. according to the high precision distance detector of a kind of double channel data acquisition according to claim 1, it is characterized in that: described electric mixting circuit (5) comprises triode Q1, described triode Q1 base stage and resistance R2 one end, R7 one end connects, described resistance R2 other end ground connection, the described resistance R7 other end is local oscillation signal input end, described triode Q1 emitter-base bandgap grading and resistance R1 one end, R6 one end connects, described resistance R1 other end ground connection, the described resistance R6 other end is the main signal input part that shakes, described triode Q1 collector connects 5V power supply by resistance R4, described triode Q1 collector is also by the electric capacity C5 of series connection, resistance R3 is connected with operational amplifier U2B end of oppisite phase, operational amplifier U2B in-phase end and resistance R11, the low-pass filter circuit of C9 composition connects, electric capacity C7 and resistance R9 is also parallel with between described operational amplifier U2B end of oppisite phase and output terminal, one A/D model calling of described operational amplifier U2B output terminal and microprocessor (1).
5. according to the high precision distance detector of a kind of double channel data acquisition according to claim 1, it is characterized in that: described laser transmission circuit (7) comprises triode Q3, described triode Q3 collector is connected with inductance L 6 one end, described triode Q3 base stage is connected with resistance R58 one end, described triode Q3 emitter-base bandgap grading is connected with resistance R59 one end, the other end of described inductance L 6 is connected with light emitting diode LD1 negative pole and is local oscillation signal input end, the described resistance R58 other end is connected with operational amplifier U3 output terminal, described operational amplifier U3 end of oppisite phase be connected electric capacity C55 between output terminal, described operational amplifier U3 in-phase end is connected with power supply by resistance R54, described operational amplifier U3 in-phase end also with triode Q2 collector, resistance R56 one end connects, the described resistance R56 other end and triode Q2 emitter grounding, described triode Q2 base stage is connected with resistance R49.
6. according to the high precision distance detector of a kind of double channel data acquisition according to claim 1, it is characterized in that: the resistance R1 that described diode receiving circuit (8) comprises avalanche diode D1 and is connected with D1, the described resistance R1 other end is connected with the end of oppisite phase of operational amplifier U1A, parallel resistance R6 and C1 between the end of oppisite phase of described operational amplifier U1A and output terminal, the in-phase end of described operational amplifier U1A connects trans-impedance amplifier (6), described trans-impedance amplifier (6) comprises the resistance R2 be connected with 5V power supply, the resistance R12 be in parallel be connected with the resistance R2 other end and electric capacity C8, the output terminal of described operational amplifier U1A is connected with the resistance R5 be in parallel and electric capacity C10 by resistance R4, the output terminal of described operational amplifier U1A is also by the resistance R3 of series connection, C5 is connected with the end of oppisite phase of operational amplifier U2B, the end of oppisite phase of described operational amplifier U2B be connected parallel resistance R9 and electric capacity C7 between output terminal, the output terminal of described operational amplifier U2B and the 2nd A/D model calling of microprocessor (1).
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107064949A (en) * | 2017-02-21 | 2017-08-18 | 莱赛激光科技股份有限公司 | A kind of green glow rangefinder |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107064949A (en) * | 2017-02-21 | 2017-08-18 | 莱赛激光科技股份有限公司 | A kind of green glow rangefinder |
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Effective date of registration: 20180305 Address after: 315499 Fengshan street, Yuyao City, Ningbo, Zhejiang Province, won a village in a village Patentee after: Ningbo wedi Seiko Machinery Co., Ltd. Address before: 315499 Yongfeng village, Fengshan street, Yuyao City, Ningbo City, Zhejiang Province Patentee before: Yuyao Weidi Photoelectric Technology Co., Ltd. |