CN102929123A - Measurement system for start time difference between high-speed light signal acquisition equipment and high-speed electric signal acquisition equipment - Google Patents
Measurement system for start time difference between high-speed light signal acquisition equipment and high-speed electric signal acquisition equipment Download PDFInfo
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- CN102929123A CN102929123A CN2012104580098A CN201210458009A CN102929123A CN 102929123 A CN102929123 A CN 102929123A CN 2012104580098 A CN2012104580098 A CN 2012104580098A CN 201210458009 A CN201210458009 A CN 201210458009A CN 102929123 A CN102929123 A CN 102929123A
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Abstract
The invention discloses a measurement system for a start time difference between high-speed light signal acquisition equipment and high-speed electric signal acquisition equipment. The measurement system is used for measuring or calibrating the response time difference for trigger signals between the high-speed light signal acquisition equipment (such as a high-speed camera) and the high-speed electric signal acquisition equipment (such as a high-speed strain gauge). The measurement system comprises a signal generation unit, a data acquisition unit and a data processing unit. The measurement system can achieve calibration and measurement of the start time difference between the high-speed light signal acquisition equipment (such as the high-speed camera) and the high-speed electric signal acquisition equipment (such as the high-speed strain gauge), and solves the problem that the time difference between the high-speed light signal acquisition equipment and the high-speed electric signal acquisition equipment cannot be accurately measured in the high-speed measurement process. The measurement accuracy of the start time difference in the measurement system reaches 10ns, so that the accuracy requirements of most of high-speed measurement processes can be met.
Description
Technical field
The present invention relates to the kinetic measurement analysis field based on high-speed light, electrical signal collection, particularly start the measurement of the time difference between a kind of high-speed light, the electrical signal collection equipment.
Background technology
In Experimental Mechanics or special engineering detection field, the destruction of measuring the dynamic mechanical behavior of material or structure or research structure when needs is out of shape fast or during destructive process, must be gathered experimental data with high-speed signal acquisition equipment with injuring to wait.High speed acquisition equipment commonly used in the reality has two classes: a class is electricity (pressure) signal collecting device, be used for gathering electricity (pressure) signal of various kinds of sensors output, this equipment generally is used for gathering the quick change procedure of the physical quantitys such as strain, load or being used for directly measuring dither (such as acceleration) signal; Another kind of is light signal collection equipment, and such as high speed camera, this equipment generally is used for gathering high speed image.
In aforementioned scientific research and engineering detecting, generally need get up to analyse in depth the dynamic mechanical behavior of material or structure with Signal cooperations such as load, strain, temperature, pressure with the image of the Fast Process of high speed camera record.
For example, when structure of research loads destruction, need to know how much load corresponding to certain collapse state that high speed camera is taken is; Perhaps under certain scene of blast, how much its temperature or pressure is.For this reason, in this type of is measured, high-speed light, electrical signal collection equipment need to be united use, and this just requires high-speed optical signal collecting device (following illustrate as an example of high speed camera example) to collect the electric signal that picture signal and high-speed electrical signals collecting device (following illustrate as an example of the high speed strain instrument example) collect strictly to be mapped in time.Present conventional way is as shown in Figure 1:
1) produces " initial " signal by trigger switch, this signal is told two-way, and this signal is transformed to the trigger pip that adapts with high speed camera and high speed strain instrument with related circuit, then trigger respectively high speed camera and high speed strain instrument;
2) suppose that high speed camera and high speed strain instrument start collection simultaneously, the first width of cloth image of high speed camera and first data of high speed strain instrument are accurately corresponding on time shaft;
3) utilize the acquisition rate conversion successive image of high speed camera and high speed strain instrument and data acquisition constantly, and it is aimed on time shaft successively.
But in the reality, above-mentioned (2) some hypothesis is not necessarily set up, and is false in a lot of situations in other words.This be because, high-speed equipment is from receiving trigger pip to beginning to gather very little but mistiming that really exist (below be referred to as to trigger the response time), and because high speed camera is different with high speed strain instrument manufacturer, apparatus structure is different, and probably its triggering response time there are differences.That is to say, although trigger pip arrives high speed camera and high speed strain instrument simultaneously, the first width of cloth image of high speed camera and first data of high speed strain instrument not necessarily gather simultaneously, and there is a mistiming (namely two system triggers response times is poor, hereinafter referred to as to time error) in the two.This inner structure that time error is depended on different systems is a kind of error of outwardness.Generally speaking, time error is arrived a few tenths of millisecond magnitude in a few percent, for not too fast process, such as the picking rate of the hundreds of width of cloth to one thousand width of cloth images p.s., this error is not easy to arouse attention, and perhaps can be left in the basket; But for the very research of Fast Process, such as the picking rate of the hundreds thousand of width of cloth images of per second, thisly may cause several width of cloth to the deviation of tens width of cloth images to time error, make data analysis gross error occur.
Also there is not at present a kind of this system to time error of measuring or demarcate.
Summary of the invention
The purpose of this invention is to provide the measuring system that starts the time difference between a kind of high-speed light, the electrical signal collection equipment, can't measure or demarcate the problem that starts the time difference between high speed camera and the high-speed electrical signals data acquisition unit in existing light, the electric high-speed joint recording geometry to solve.
Measuring system provided by the invention be used for to be measured or demarcates between high-speed optical signal collecting device and the high-speed electrical signals collecting device response time difference for trigger pip, it is characterized in that, this measuring system comprises: signal generating unit, data acquisition unit and data processing unit; Wherein,
Described signal generating unit is connected with described data acquisition unit, is used for requiring to produce and send simultaneously three tunnel trigger pips to start described data acquisition unit according to the trigger pip of the light of demarcating, electrical signal collection equipment;
Described data acquisition unit, be connected with data processing unit with described signal generating unit, be used for receiving three tunnel trigger pips that described signal generating unit sends simultaneously, start described high-speed light, electrical signal collection equipment and Waveform signal generating circuit, the data that the collection signal circuit for generating produces in described high-speed light, the electrical signal collection equipment are given described data processing unit;
Described data processing unit is connected with described data acquisition unit, is used for the data that analysis and processing said data collecting unit gather, and obtains the startup time difference of described high-speed light, electric collecting device.
Further, wherein, described data acquisition unit comprises: Waveform signal generating circuit, signal delay circuit, signaling conversion circuit, laser tube, half-reflecting half mirror, light intensity decreasing mirror, photodiode, voltage signal amplifying circuit, high-speed electrical signals collecting device and high-speed optical signal collecting device; Wherein,
Described Waveform signal generating circuit, be connected with signal delay circuit with described signal generating unit, be used for after wherein one tunnel trigger pip that receives from described signal generating unit, sine wave or the square wave of generation assigned frequency are given described signal delay circuit;
Described signal delay circuit is connected with signaling conversion circuit with described Waveform signal generating circuit, after being used for receiving described sine wave or square wave and carrying out delay process, sends to described signaling conversion circuit;
Described signaling conversion circuit is connected with laser tube with described signal delay circuit, for sine wave or the square wave behind the reception delay, it is processed generation be fit to voltage signal of work to described laser tube;
Described laser tube, be connected with described signaling conversion circuit, be used for behind the voltage signal that receives described signaling conversion circuit transmission, giving off laser beam by the input voltage rule is projected on the described half-reflecting half mirror, and its light beam exit direction is vertical with described half-reflecting half mirror;
Described half-reflecting half mirror is in the same light path with described laser tube and light intensity decreasing mirror, is used for the laser that described laser tube produces is divided into two bundles, and beam of laser is projected to described light intensity decreasing mirror, and another bundle laser projection is to optical screen;
Described light intensity decreasing mirror is in the same light path with described half-reflecting half mirror and photodiode, is used for weakening the light intensity through the transmitted light beam behind the described half-reflecting half mirror, and it is radiated on the described photodiode;
Described photodiode is in the same light path with described light intensity decreasing mirror and voltage signal amplifying circuit, is used for changing by the light intensity of the laser behind the described light intensity decreasing mirror being converted into change in voltage;
Described voltage signal amplifying circuit is connected with the high-speed electrical signals collecting device with described photodiode, and the light current pressure variable signal that is used for that described photodiode is produced is enlarged into and satisfies the voltage signal that described high-speed electrical signals collecting device is measured requirement;
Described high-speed electrical signals collecting device is connected with described voltage amplifier circuit, is used for gathering the voltage signal that described voltage signal amplifying circuit produces;
Described high-speed optical signal collecting device is connected with described signal generating unit, is used for gathering after receiving from one tunnel trigger pip of described signal generating unit the laser spot image that is radiated on the described optical screen.
Further, wherein, described high-speed electrical signals collecting device further is the high speed strain instrument.
Further, wherein, described high-speed optical signal collecting device further is high speed camera.
Start the measuring system of the time difference between a kind of high-speed light of the present invention, the electrical signal collection equipment, have following technique effect:
1) adopt measuring system of the present invention can realize starting between high speed camera and the high-speed electrical signals collecting device demarcation and the measurement of the time difference, solved measure at a high speed between high speed light, electric signal in the past can not be accurately to the time problem.
2) adopt measuring system of the present invention to reach 10ns at the startup TOA measurement accuracy, can satisfy the measurement of most high speed processes.
Description of drawings
Fig. 1 is high-speed light of the prior art, electrical signal collection device structure schematic diagram;
Fig. 2 is the system architecture schematic diagram that starts time difference measurement between the embodiment of the invention one described high-speed light, the electrical signal collection equipment;
Fig. 3 is the concrete inner structure schematic diagram of data acquisition unit 202 in the embodiment of the invention one described measuring system;
Fig. 4 is the particular circuit configurations figure of the signal generating unit 201 in the embodiment of the invention one described measuring system;
Fig. 5 is the particular circuit configurations figure of the data acquisition unit 202 in the embodiment of the invention one described measuring system;
Fig. 6 is the data and curves that gathers of data processing unit 203 draws in the embodiment of the invention one described measuring system high speed camera and high speed strain instrument and to time error analytic process figure.
Embodiment
Censure specific components as in the middle of instructions and claim, having used some vocabulary.Those skilled in the art should understand, and hardware manufacturer may be called same assembly with different nouns.This specification and claims are not used as distinguishing the mode of assembly with the difference of title, but the criterion that is used as distinguishing with the difference of assembly on function.Be an open language such as " comprising " mentioned in the middle of instructions and the claim in the whole text, therefore should be construed to " comprise but be not limited to "." roughly " refer in acceptable error range, those skilled in the art can solve the technical problem in the certain error scope, substantially reach described technique effect.The instructions subsequent descriptions is for implementing better embodiment of the present invention, and right described description is to illustrate that rule of the present invention is purpose, is not to limit scope of the present invention.Protection scope of the present invention is as the criterion when looking the claims person of defining.
Below will cooperate graphic and embodiment describes embodiments of the present invention in detail, by this to the present invention how the application technology means implementation procedure that solves technical matters and reach the technology effect can fully understand and implement according to this.
As shown in Figure 2, for starting the measuring system of the time difference between a kind of high-speed light provided by the present invention, the electrical signal collection equipment, be used for to measure or demarcate between high-speed optical signal collecting device and the high-speed electrical signals collecting device response time difference for trigger pip, wherein, this measuring system comprises: signal generating unit 201, data acquisition unit 202 and data processing unit 203; Wherein,
Described signal generating unit 201 is connected with described data acquisition unit 202, is used for requiring to produce and send simultaneously three tunnel trigger pips to start described data acquisition unit 202 according to the trigger pip of the light of demarcating, electrical signal collection equipment; Wherein as shown in Figure 4, be signal generating unit 201 particular circuit configurations figure in the present embodiment.
Described data acquisition unit 202, be connected with data processing unit 203 with described signal generating unit 201, be used for receiving three tunnel trigger pips that described signal generating unit 201 sends simultaneously, start described high-speed light, electrical signal collection equipment and signal generating circuit, the data that the collection signal circuit for generating produces in described high-speed light, the electrical signal collection equipment are given described data processing unit 203;
Described data processing unit 203 is connected with described data acquisition unit 202, be used for to analyze and data that processing said data collecting unit 202 gathers, obtain high-speed light, electric collecting device to time error.
Specifically, from the image sequence of high-speed optical signal collecting device collection, analyze the light intensity delta data of luminous point, and the change in voltage data of itself and the collection of electrical signal collection equipment are mated and contrasted at time shaft, obtain time error.
Further, as shown in Figure 3, described data acquisition unit 202 comprises: what adopt in Waveform signal generating circuit 2021, signal delay circuit 2022, signaling conversion circuit 2023, laser tube 2024, half-reflecting half mirror 2025, light intensity decreasing mirror 2026, photodiode 2027, voltage signal amplifying circuit 2028, high-speed electrical signals collecting device 2029(the present embodiment is the high speed strain instrument) and high-speed optical signal collecting device 2030(the present embodiment in what adopt is high speed camera); Wherein,
Described Waveform signal generating circuit 2021, be connected with signal delay circuit 2022 with described signal phonation unit 201, be used for receiving wherein one tunnel trigger pip from described signal generating unit 201, sine wave or the square wave of generation assigned frequency are given described signal delay circuit 2022;
Described signal delay circuit 2022 is connected with signaling conversion circuit 2023 with described Waveform signal generating circuit 2021, after being used for receiving described sine wave or square wave and carrying out delay process, sends to described signaling conversion circuit 2023;
Described signaling conversion circuit 2023 is connected with laser tube 2024 with described signal delay circuit 2022, for sine wave or the square wave behind the reception delay, it is processed the generation voltage signal to described laser tube 2024;
Described laser tube 2024, be connected with described signaling conversion circuit 2023, be used for behind the voltage signal that receives described signaling conversion circuit 2023 transmissions, giving off laser beam by the input voltage rule is projected on the described half-reflecting half mirror 2025, and its light beam exit direction is vertical with described half-reflecting half mirror 2025;
Described half-reflecting half mirror 2025, be in the same light path with described laser tube 2024 and light intensity decreasing mirror 2026, be used for the laser that described laser tube 2024 produces is divided into two bundles, beam of laser is projected to described light intensity decreasing mirror 2026, and another bundle laser projection is to optical screen;
Described light intensity decreasing mirror 2026 is in the same light path with described half-reflecting half mirror 2025 and photodiode 2027, is used for weakening the light intensity through the transmitted light beam behind the described half-reflecting half mirror 2025, and it is radiated on the described photodiode 2027;
Described photodiode 2027 is in the same light path with described light intensity decreasing mirror 2026 and signaling conversion circuit 2023, is used for changing by the light intensity of the laser behind the described light intensity decreasing mirror 2026 being converted into change in voltage;
Described voltage signal amplifying circuit 2028, be connected with high-speed electrical signals collecting device 2029 with described photodiode 2027, be used for pressing variable signal to be enlarged into the light current that described photodiode 2027 produces and satisfy the voltage signal that described high-speed electrical signals collecting device 2029 measurements require;
Described high-speed electrical signals collecting device 2029 is connected with described voltage signal amplifying circuit 2028, is used for gathering the voltage signal that described voltage signal amplifying circuit 2028 produces;
Described high-speed optical signal collecting device 2030 couples mutually with described signal generating unit 201, is used for receiving from gathering the laser spot image that is radiated on the described optical screen after one tunnel trigger pip of described signal generating unit 201.
As shown in Figure 5, be described data acquisition unit 202 particular circuit configurations figure in the present embodiment, wherein said high-speed electrical signals collecting device 2029 is realized concrete operations for high speed strain instrument (perhaps also can be described as dynamic strain indicator) by it in the accompanying drawings, and described high-speed optical signal collecting device 2030 is realized concrete operations for high-speed CCD by it in the accompanying drawings.
Shown in Fig. 2,3,5 and 6, the concrete operation step that starts the system of time difference measurement between one described kind of high-speed light of the above embodiment of the present invention, the electrical signal collection equipment is described, concrete steps are as follows:
The first step is carried out the installation in position of measuring system of the present invention according to one-piece construction shown in Figure 2;
Second step, adjust the spot that half-reflecting half mirror 2025 in the data acquisition unit 202 and reflector position make reflect beams of laser light and be positioned at optical screen central authorities, and the position of adjusting light intensity decreasing mirror 2026 and photodiode 2027 makes spot of another bundle laser beam after the transmission be positioned at the center of photodiode 2027;
The 3rd step was positioned over tested optical screen dead ahead with high speed camera (high-speed CCD), made the spot of the laser beam on the optical screen be positioned at tested regional center, and focused and make its imaging clearly;
The 4th goes on foot, and the parameter of dynamic strain indicator is set, and is convenient to measure;
In the 5th step, enabling signal generating unit 201 produces three tunnel trigger pips to described data acquisition unit 202, and beginning experimental record data;
In the 6th step, data processing unit 203 receives data analysis and the contrast that gathers from high speed camera and dynamic strain indicator on the described data acquisition unit 202, obtains time error.
For the 6th step, concrete operations are: according to the sample frequency of high speed camera convert every width of cloth image collection constantly, then the image with the high speed camera collection exports in the data processing unit 203, the average change curve that comprises a zonule of laser spots in the statistical picture, to piece image, contrast can obtain the startup time difference (as shown in Figure 6) of high speed camera and dynamic strain indicator with the change in voltage Drawing of Curve in the photodiode that collects in change curve and the dynamic strain indicator.
Compared with prior art, start the system of time difference measurement between a kind of high-speed light of the present invention, the electrical signal collection equipment, have following technique effect:
1) adopt measuring system of the present invention can realize starting between high speed camera and the high-speed electrical signals collecting device demarcation and the measurement of the time difference, solved measure at a high speed between high speed light, electric signal in the past can not be accurately to the time problem.
2) adopt measuring system of the present invention to reach 10ns at the startup TOA measurement accuracy, can satisfy the measurement of most high speed processes.
The above embodiments only are used for exemplifying enforcement aspect of the present invention, and explain technical characterictic of the present invention, are not to limit category of the present invention.The technical field technician can all belong to the scope that the present invention advocates according to the arrangement of the unlabored change of spirit of the present invention or isotropism under any, and interest field of the present invention should be as the criterion with claim.
Claims (4)
1. start the measuring system of the time difference between a high-speed light, the electrical signal collection equipment, be used for to measure or demarcate between high-speed optical signal collecting device and the high-speed electrical signals collecting device response time difference for trigger pip, it is characterized in that, this measuring system comprises: signal generating unit, data acquisition unit and data processing unit; Wherein,
Described signal generating unit is connected with described data acquisition unit, is used for also sending simultaneously three tunnel trigger pips to start described data acquisition unit according to the requirement generation of the light of demarcating, electrical signal collection device trigger signal;
Described data acquisition unit, be connected with data processing unit with described signal generating unit, be used for receiving three tunnel trigger pips that described signal generating unit sends simultaneously, start described high-speed light, electrical signal collection equipment and Waveform signal generating circuit, the data that the collection signal circuit for generating produces in described high-speed light, the electrical signal collection equipment are given described data processing unit;
Described data processing unit is connected with described data acquisition unit, is used for the data that analysis and processing said data collecting unit gather, and obtains the startup time difference of described high-speed light, electric collecting device.
2. start the measuring system of the time difference between high-speed light as claimed in claim 1, the electrical signal collection equipment, it is characterized in that, described data acquisition unit comprises: Waveform signal generating circuit, signal delay circuit, signaling conversion circuit, laser tube, half-reflecting half mirror, light intensity decreasing mirror, photodiode, voltage signal amplifying circuit, high-speed electrical signals collecting device and high-speed optical signal collecting device; Wherein,
Described Waveform signal generating circuit, be connected with signal delay circuit with described signal generating unit, be used for after wherein one tunnel trigger pip that receives from described signal generating unit, high_frequency sine wave or the square wave of an appointment of generation are given described signal delay circuit;
Described signal delay circuit is connected with signaling conversion circuit with described Waveform signal generating circuit, after being used for receiving described sine wave or square wave and it being carried out delay process, sends to described signaling conversion circuit;
Described signaling conversion circuit is connected with laser tube with described signal delay circuit, for sine wave or the square wave behind the reception delay, it is processed, and produces standard compliant operating voltage signal to described laser tube;
Described laser tube, be connected with described signaling conversion circuit, be used for behind the voltage signal that receives described signaling conversion circuit transmission, giving off laser beam by the input voltage rule is projected on the described half-reflecting half mirror, and its light beam exit direction is vertical with described half-reflecting half mirror;
Described half-reflecting half mirror is in the same light path with described laser tube and light intensity decreasing mirror, is used for the laser that described laser tube produces is divided into two bundles, and beam of laser is projected to described light intensity decreasing mirror, and another bundle laser projection is to optical screen;
Described light intensity decreasing mirror is in the same light path with described half-reflecting half mirror and photodiode, is used for weakening the light intensity through the transmitted light beam behind the described half-reflecting half mirror, and it is radiated on the described photodiode;
Described photodiode is in the same light path with described light intensity decreasing mirror and voltage signal amplifying circuit, is used for changing by the light intensity of the laser behind the described light intensity decreasing mirror being converted into change in voltage, and its transfer delay is 10ns;
Described voltage signal amplifying circuit is connected with the high-speed electrical signals collecting device with described photodiode, and the light current pressure variable signal that is used for that described photodiode is produced is enlarged into and satisfies the voltage signal that described high-speed electrical signals collecting device is measured requirement;
Described high-speed electrical signals collecting device is connected with described voltage amplifier circuit, is used for gathering the voltage signal that described voltage signal amplifying circuit produces;
Described high-speed optical signal collecting device is connected with described signal generating unit, is used for gathering after receiving from one tunnel trigger pip of described signal generating unit the laser spot image that is radiated on the described optical screen.
3. start the measuring system of the time difference between high-speed light as claimed in claim 2, the electrical signal collection equipment, it is characterized in that, described high-speed electrical signals collecting device further is high speed strain instrument collecting device.
4. start the measuring system of the time difference between high-speed light as claimed in claim 1, the electrical signal collection equipment, it is characterized in that, described high-speed optical signal collecting device further is high speed camera.
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| CN108093173A (en) * | 2017-12-14 | 2018-05-29 | 北京理工大学 | The system and method for the box-like Image Acquisition moment calibration of optocoupler |
| CN108195533A (en) * | 2017-12-14 | 2018-06-22 | 北京理工大学 | A kind of system and method for being accurately positioned the data acquisition moment |
| CN109031926A (en) * | 2018-09-20 | 2018-12-18 | 中国科学院西安光学精密机械研究所 | Device and method for measuring imaging delay time of camera device |
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| CN109031926A (en) * | 2018-09-20 | 2018-12-18 | 中国科学院西安光学精密机械研究所 | Device and method for measuring imaging delay time of camera device |
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| CN110703644A (en) * | 2019-09-30 | 2020-01-17 | 广东工业大学 | Special ns-level synchronous trigger device for numerical control equipment |
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