CN112461041A - Single-row differential light curtain target device and detection method thereof - Google Patents
Single-row differential light curtain target device and detection method thereof Download PDFInfo
- Publication number
- CN112461041A CN112461041A CN202011263653.0A CN202011263653A CN112461041A CN 112461041 A CN112461041 A CN 112461041A CN 202011263653 A CN202011263653 A CN 202011263653A CN 112461041 A CN112461041 A CN 112461041A
- Authority
- CN
- China
- Prior art keywords
- differential
- light curtain
- signal
- light source
- light
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F41—WEAPONS
- F41A—FUNCTIONAL FEATURES OR DETAILS COMMON TO BOTH SMALLARMS AND ORDNANCE, e.g. CANNONS; MOUNTINGS FOR SMALLARMS OR ORDNANCE
- F41A31/00—Testing arrangements
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F41—WEAPONS
- F41J—TARGETS; TARGET RANGES; BULLET CATCHERS
- F41J5/00—Target indicating systems; Target-hit or score detecting systems
- F41J5/02—Photo-electric hit-detector systems
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Photometry And Measurement Of Optical Pulse Characteristics (AREA)
Abstract
The invention relates to the technical field of photoelectric testing, in particular to a single-row differential type light curtain target device and a detection method thereof. The light source of the device adopts a point laser to form an array, a quasi-collimation (small divergence angle) line structure light source is formed, a receiving component divides a photodiode into single-row arrays according to a uniformly determined length, then every two staggered partitions are organized into a differential pair, each differential pair outputs a signal, and each differential signal is added after solving the absolute value of each signal to generate a final output signal. The light curtain has the characteristic of symmetrical optical structure of the receiving array, can effectively improve the capability of resisting background light fluctuation and ambient light interference of the light curtain target, and greatly improves the stability of the instrument.
Description
Technical Field
The invention relates to the technical field of photoelectric testing, in particular to a single-row differential type light curtain target device and a detection method thereof.
Background
In the weapon system damage performance evaluation, the flight speed parameter of the projectile is an important index. The current research on projectile velocity testing is mainly non-contact testing, such as: coil target, sky screen target, light screen target.
The light curtain target is used as a common zone-intercepting measuring instrument for weapons and industrial target ranges and mainly comprises an LED array light source, a photodiode array, a signal processing circuit and a supporting component. The light curtain target has the characteristics of high testing precision, flexible customization of a testing target surface, low requirement on testing environment and capability of repeated testing, so that the light curtain target is widely applied to indoor target ranges. The light curtain target is a testing device based on the photoelectric conversion principle, and the change of the luminous flux caused by the fact that the projectile penetrates through the light curtain surface is converted into a voltage signal to be output, so that the light curtain target is easily influenced by an external light signal.
In view of this, for those skilled in the art, it is an important problem in the development of the current speed measurement system for light curtain targets how to measure speed by using light curtain targets, how to eliminate the interference of external environments such as birds and mosquitoes to light, and how to eliminate the self-interference of muzzle flare light, missile bottom dragging light, etc., so as to improve the reliability of the detector.
Disclosure of Invention
In view of this, the present invention provides a single-row differential light curtain target device and a detection method thereof to solve the problem of the influence of complex background light on the speed measurement precision of the light curtain target in the existing light curtain target testing technology.
In order to solve the problems in the prior art, the technical scheme of the invention is as follows: a single-row differential light curtain target device is characterized in that: the device comprises a quasi-collimation light source and a photoelectric receiving part, wherein the photoelectric receiving part is formed by longitudinally arranging a plurality of high-speed photodiodes into a single-row linear array, is uniformly installed, has a determined length and is divided into an even number of subareas, and the number of the subareas is more than or equal to 4; the quasi-collimation light source is formed by longitudinally arranging a plurality of point lasers at equal intervals to form an array, and a quasi-collimation illumination light source is formed by defocusing adjustment.
Furthermore, the point laser is provided with a separated copper block adjusting device.
Furthermore, the quasi-collimation light source and the photodiode receiving array are oppositely arranged on the supporting structure.
A detection method of a single-row differential light curtain target device is characterized in that: the method comprises the following steps:
1) forming a differential pair by every two partitions at staggered intervals, and outputting a signal by each differential pair through a point laser;
2) the output signal of each differential pair is subjected to independent transconductance amplification and absolute value operation respectively, and then the multi-path operation result is subjected to addition operation to generate a total output signal;
3) the output signal of the photoelectric receiving part needs to be obtained by synthesizing two paths of signals of at least 2 differential pairs.
Compared with the prior art, the invention has the following advantages:
1. according to the invention, the additional noise influence caused by background light fluctuation can be reduced through differential detection, and the interference of muzzle flare light, missile bottom dragging light and the like is eliminated, so that the reliability of the detector is improved;
2. the invention can eliminate the error of the field blind area caused by the device and the differential detection method by forming a differential pair by two staggered partitions.
Description of the drawings:
FIG. 1 is a schematic diagram of the working principle of the present invention;
FIG. 2 is a circuit diagram of the differential operation of the present invention;
fig. 3 is a schematic view of a light curtain structure according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The invention discloses a single-row differential light curtain target device, which comprises a photoelectric output part and a photoelectric receiving part, wherein the photoelectric output part and the photoelectric receiving part are longitudinally partitioned according to a uniformly determined length to form a single-row array, the number of partitions is an even number which is more than or equal to 4, each area of the photoelectric output part is longitudinally arranged by equal number of equally-spaced point-shaped lasers to form an array, the photoelectric receiving part is a photodiode, and the number of the photodiodes is the same as the number of the point-shaped lasers and is oppositely arranged;
the light source array and the photodiode receiving array are oppositely arranged on the supporting structure, and the connecting rod plays a role in fixing the supporting structure.
The device adopts a quasi-collimation (small divergence angle) line structure light source for a light source array component, the light source is emitted by an array formed by point lasers, meanwhile, a defocusing method is applied to form a preset divergence angle illumination light beam, and finally, a complete light curtain is formed, and in addition, a separated copper block is adopted for installation during installation, and the method can realize the functions of heat dissipation and light beam direction fine adjustment.
A detection method of a single-row differential light curtain target device comprises the following steps:
1) forming a differential pair by every two partitions at staggered intervals, and outputting a signal by each differential pair through a point laser;
2) the output signal of each differential pair is subjected to independent transconductance amplification and absolute value operation respectively, and then the multi-path operation result is subjected to addition operation to generate a total output signal;
3) the output signal of the photoelectric receiving part needs to be obtained by synthesizing two paths of signals of at least 2 differential pairs.
The detection method firstly utilizes the device to form a complete light curtain and a signal processing circuit. When a target passes through the light curtain, the change of the luminous flux of the corresponding subarea on the curtain surface is caused, and the change is processed by a signal circuit to finally generate a target curtain passing signal.
Example (b): the detailed description is made by 2 differential pairs, as shown in fig. 1:
the single-row differential light screen target speed measuring device in the embodiment comprises an array light source, a differential receiving device, a signal conditioning circuit and a supporting structure,
the light source adopts a quasi-collimation (small divergence angle) line structure light source, is emitted by an array formed by point lasers, and is installed by adopting a separated copper column when the point lasers are installed, so that the method can realize the functions of heat dissipation and fine adjustment of the direction of a light beam; the differential receiving device consists of A, B, C, D4 partitions with equal length and equal width, and equal numbers of photodiodes are distributed at equal intervals in the partitions; the partitions A and C, and B and D form a pair of differential pairs respectively.
As shown in fig. 2: since B, D is connected in the same manner as A, C, only the schematic of the A, C circuit is shown here.
The circuit schematic diagram adopts a connection method of reverse bias of the photodiodes, the photodiodes are connected in a differential mode in arrangement, and equal numbers of photodiodes are arranged in each subarea at equal intervals;
when the target passes through the partition A, the luminous flux of the partition A is reduced, the luminous flux of the partition C is unchanged, the photocurrents generated by the partition A and the partition C are asymmetric, and current flows into or out of the transconductance amplifier, so that a target passing signal is generated.
When the external ambient light changes, the luminous fluxes of the subarea A and the subarea C change simultaneously, the photocurrents of the subarea A and the subarea C also change simultaneously, no current flows into the transconductance amplifier, and no signal is generated.
For a differential pair, such as partition a and partition C, a positive signal is generated when the target is traversed by partition a and a negative signal is generated when the target is traversed by partition C; similarly, for the differential pair subarea B and the subarea D, when a target passes through the space between the subareas B, C, a view field blind area caused by passing through the middle of the differential circuit cannot be generated due to the interval arrangement, at the moment, the subarea B generates a positive signal, the subarea C generates a negative signal, abnormal differential pair signals are output after subarea addition operation, therefore, the absolute value operation is carried out on each output differential pair signal, a standard value is output, and then the sum operation is carried out on the output multi-path standard values to generate an overall output signal.
For the receiving area shown in fig. 1, when the target passes through a single partition (e.g., partition a), a normal bullet signal is generated, and when the target passes through an adjacent partition (e.g., between partition a and partition B), due to the different polarities of the signals generated by the different partitions, if the absolute operation is not performed, a situation that the signal output caused by the normal target may be weak or even zero is caused. Therefore, each path of signal of each differential pair is subjected to absolute value operation, so that the occurrence of the test blind area can be avoided, and the normal function of the instrument is ensured.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and it should be noted that those skilled in the art should make modifications and variations without departing from the principle of the present invention.
Claims (4)
1. A single-row differential light curtain target device is characterized in that: the device comprises a quasi-collimation light source and a photoelectric receiving part, wherein the photoelectric receiving part is formed by longitudinally arranging a plurality of high-speed photodiodes into a single-row linear array, is uniformly installed, has a determined length and is divided into an even number of subareas, and the number of the subareas is more than or equal to 4; the quasi-collimation light source is formed by longitudinally arranging a plurality of point lasers at equal intervals to form an array, and a quasi-collimation illumination light source is formed by defocusing adjustment.
2. The single-column differential light curtain target device of claim 1, wherein: the above-mentioned
With a separate copper block adjustment.
3. The single-column differential light curtain target device of claim 1 or 2, wherein:
the quasi-collimation light source and the photodiode receiving array are oppositely arranged on the supporting structure.
4. The method of claim 1, wherein the method comprises the steps of: the method comprises the following steps:
1) forming a differential pair by every two partitions at staggered intervals, and outputting a signal by each differential pair through a point laser;
2) the output signal of each differential pair is subjected to independent transconductance amplification and absolute value operation respectively, and then the multi-path operation result is subjected to addition operation to generate a total output signal;
3) the output signal of the photoelectric receiving part needs to be obtained by synthesizing two paths of signals of at least 2 differential pairs.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011263653.0A CN112461041A (en) | 2020-11-12 | 2020-11-12 | Single-row differential light curtain target device and detection method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011263653.0A CN112461041A (en) | 2020-11-12 | 2020-11-12 | Single-row differential light curtain target device and detection method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112461041A true CN112461041A (en) | 2021-03-09 |
Family
ID=74825979
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011263653.0A Pending CN112461041A (en) | 2020-11-12 | 2020-11-12 | Single-row differential light curtain target device and detection method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112461041A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115110156A (en) * | 2022-05-19 | 2022-09-27 | 杭州纺织机械集团有限公司 | Photoelectric cocoon volume detecting device for cocoon feeding machine |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6414747B1 (en) * | 2000-01-14 | 2002-07-02 | Charles E. Hardy | Infrared photodetector apparatus for measuring projectile velocity |
| CN1614348A (en) * | 2004-12-02 | 2005-05-11 | 西安工业学院 | Veiling target with big target face |
| CN106199053A (en) * | 2016-04-18 | 2016-12-07 | 北京理工大学 | A kind of light-gas gun grade projectile-velotity detecting system |
| CN110702938A (en) * | 2019-10-18 | 2020-01-17 | 西安工业大学 | Device and method for measuring initial speed of array gun barrel projectile by wedge-shaped light curtain array |
| CN210570247U (en) * | 2019-06-25 | 2020-05-19 | 河南科技大学 | Intelligent light curtain target coordinate measuring system |
| CN111273371A (en) * | 2020-03-05 | 2020-06-12 | 广州安协科技股份有限公司 | Correlation light curtain, detection system and installation detection method of correlation light curtain |
-
2020
- 2020-11-12 CN CN202011263653.0A patent/CN112461041A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6414747B1 (en) * | 2000-01-14 | 2002-07-02 | Charles E. Hardy | Infrared photodetector apparatus for measuring projectile velocity |
| CN1614348A (en) * | 2004-12-02 | 2005-05-11 | 西安工业学院 | Veiling target with big target face |
| CN106199053A (en) * | 2016-04-18 | 2016-12-07 | 北京理工大学 | A kind of light-gas gun grade projectile-velotity detecting system |
| CN210570247U (en) * | 2019-06-25 | 2020-05-19 | 河南科技大学 | Intelligent light curtain target coordinate measuring system |
| CN110702938A (en) * | 2019-10-18 | 2020-01-17 | 西安工业大学 | Device and method for measuring initial speed of array gun barrel projectile by wedge-shaped light curtain array |
| CN111273371A (en) * | 2020-03-05 | 2020-06-12 | 广州安协科技股份有限公司 | Correlation light curtain, detection system and installation detection method of correlation light curtain |
Non-Patent Citations (3)
| Title |
|---|
| 侯锦亮等: "激光复合光幕靶测速系统设计", 《弹箭与制导学报》 * |
| 李翰山等: "天幕靶抗光干扰设计与分析", 《半导体光电》 * |
| 陆遥: "光电二极管阵列光幕探测与处理电路设计", 《中国优秀博硕士学位论文全文数据库（硕士） 工程科技Ⅱ辑》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115110156A (en) * | 2022-05-19 | 2022-09-27 | 杭州纺织机械集团有限公司 | Photoelectric cocoon volume detecting device for cocoon feeding machine |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US7276681B2 (en) | On-board light source based gain correction for semi-active laser seekers | |
| US20180275310A1 (en) | Optoelectronic Sensor and Method for Detecting Objects | |
| CN110456370B (en) | Flight time sensing system and distance measuring method thereof | |
| CA2652591A1 (en) | Position detector | |
| CN104020312A (en) | Laser screen target tachymeter and ballistic trajectory capturing method | |
| CN112461041A (en) | Single-row differential light curtain target device and detection method thereof | |
| CN104101726A (en) | Reflection-type laser curtain speed measurement method | |
| US20020093638A1 (en) | Laser range finder for large ranges of measurement with a special receiver | |
| CN104713474A (en) | Multi-beam ladder plane mirror laser interferometer | |
| JP2013181982A (en) | Optical encoder having led current adjustment system | |
| EP3671275A1 (en) | Laser distance measuring device and method of use thereof | |
| Li et al. | Detection sensitivity correction calculation model and application of photoelectric detection target in four-screen intersection testing system | |
| US20050051715A1 (en) | Optical encoder | |
| Li et al. | Study and analysis on a new optical detection design method for photoelectric detection target | |
| US8400643B2 (en) | Displacement sensor using multiple position sensitive photodetectors | |
| EP1903294A1 (en) | Laser target seeker device | |
| CN108072913B (en) | Differential photoelectric detection method and device for moving target | |
| CN110645848A (en) | Pellet landing coordinate and speed measuring device | |
| Califano et al. | Advancements in the Camera Setup for Unsteady Pressure Sensitive Paint at NASA Ames Research Center | |
| Li | Research on space target detection ability calculation method and spectral filtering technology in sky‐screen's photoelectric system | |
| Li et al. | Multi-area detection sensitivity calculation model and detection blind areas influence analysis of photoelectric detection target | |
| US3211911A (en) | Method and photocell device for obtaining light source position data | |
| CN207650416U (en) | A kind of novel light curtain device | |
| US20190113384A1 (en) | Optical measuring device | |
| Lu et al. | A calculation model of infrared detection system with improved detection capability |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20210309 |
|
| WD01 | Invention patent application deemed withdrawn after publication |