CN111366239A - Laser irradiation time detection system and detection method - Google Patents
Laser irradiation time detection system and detection method Download PDFInfo
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- CN111366239A CN111366239A CN201811600970.XA CN201811600970A CN111366239A CN 111366239 A CN111366239 A CN 111366239A CN 201811600970 A CN201811600970 A CN 201811600970A CN 111366239 A CN111366239 A CN 111366239A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J1/00—Photometry, e.g. photographic exposure meter
- G01J1/42—Photometry, e.g. photographic exposure meter using electric radiation detectors
- G01J1/4257—Photometry, e.g. photographic exposure meter using electric radiation detectors applied to monitoring the characteristics of a beam, e.g. laser beam, headlamp beam
Abstract
The application relates to the technical field of laser detection, in particular to a laser irradiation detection system and a detection method, which comprise the following steps: the sampling unit obtains a sampling optical signal and sends the sampling optical signal to the pulse detection and threshold value adjustment unit, the pulse detection and threshold value adjustment unit carries out high-low level conversion according to the received sampling optical signal so as to generate an indication signal of the sampling timing unit, the sampling timing unit receives the indication signal, and the irradiation duration of the sampling optical signal is calculated according to the indication signal. The process realizes real-time and automatic measurement of laser irradiation time based on the digital pulse measurement and intelligent communication technology of the microcontroller, can greatly shorten the working period of similar applications, reduces the workload, and is convenient for system integration and data processing; the reserved adjustment link enables the system to have strong adaptability to different application scenes.
Description
Technical Field
The application relates to the technical field of laser detection, in particular to a laser irradiation time detection system and a detection method.
Background
In the fields of laser damage tests, irradiation effect research, laser processing, dosage calibration of medical equipment and the like, precise measurement of strong laser irradiation time is often required. Current research and applications in this regard have largely focused on using oscilloscope observations; the irradiation time is analyzed by observing a data curve afterwards, the method is usually operated manually, the method is influenced by the limitation of storage capacity and the change of a trigger threshold, data cannot be processed in real time, and the measurement link is adjusted fussy, so that the requirement of large-batch rapid measurement cannot be met.
Disclosure of Invention
In view of this, the present application provides a detection system and a detection method for laser irradiation time, so as to solve the problems in the prior art that the detection process of laser irradiation time has poor automation degree, cannot perform real-time measurement, and has low efficiency.
A first aspect of an embodiment of the present application provides a detection system for laser irradiation time, where the detection system for laser irradiation time includes: the device comprises a sampling unit, a pulse detection and threshold value adjustment unit and a sampling timing unit;
the sampling unit is used for acquiring a sampling optical signal and sending the sampling optical signal to the pulse detection and threshold value adjustment unit;
the pulse detection and threshold adjustment unit is respectively connected with the sampling unit and the sampling timing unit, and is used for performing high-low level conversion according to the received sampling optical signal to generate an indication signal of the sampling timing unit, wherein the indication signal comprises a timing starting signal or a timing ending signal;
and the sampling timing unit is used for receiving the indication signal and calculating the irradiation duration of the sampling light signal according to the indication signal.
Optionally, the sampling unit includes a sampling prism, a detection lens connected to the sampling prism, and an attenuation sheet connected to the detection lens.
Optionally, the pulse detection and threshold adjustment unit includes a photodetector, a D/a converter, and a comparator;
the photoelectric detector is used for inputting a detection voltage to the positive input end of the comparator according to the existence of the sampling optical signal;
the comparator outputs a high level or a low level according to a relationship between the detection voltage and a reference voltage input by the D/A converter to generate the indication signal.
Optionally, the comparator outputs a high level or a low level according to a relationship between the detection voltage and a reference voltage input by the D/a converter to generate the indication signal, and specifically includes:
if the detection voltage input by the positive input end of the comparator is higher than the reference voltage, the comparator outputs a high level to generate a timing starting signal;
and if the detection voltage input by the positive input end of the comparator is lower than the reference voltage, the comparator outputs a low level to generate an end timing signal.
Optionally, the laser irradiation time detection system further includes: the communication unit is connected with the sampling timing unit;
the communication unit is used for acquiring the irradiation duration from the sampling timing unit and outputting the irradiation duration to a specified position.
Optionally, the communication unit is further configured to set a magnitude of a reference voltage input by the D/a converter to the comparator according to a user instruction.
Optionally, the sampling timing unit includes a counter, a sampling single chip microcomputer and a timing clock, and the counter is connected to the timing clock and the sampling single chip microcomputer respectively;
the counter indicates the timing clock to start timing when receiving the timing starting signal;
and the sampling single chip microcomputer is also used for latching the count value of the timing clock when the timing ending signal is received, and instructing the sampling single chip microcomputer to read the count value so as to calculate the irradiation duration according to the count value.
Optionally, the sampling single chip microcomputer is further configured to reset the counter after latching a count value of the timing clock when receiving the end timing signal.
A second aspect of the embodiments of the present application provides a method for detecting laser irradiation time, where the method for detecting laser irradiation time includes:
acquiring a sampling optical signal;
carrying out high-low level conversion according to the sampling optical signal to generate an indication signal for timing, wherein the indication signal comprises a timing starting signal or a timing ending signal;
and calculating the irradiation duration of the sampling light signal according to the generation time of the starting timing signal and the ending timing signal.
Optionally, the performing high-low level conversion according to the sampling light signal to generate an indication signal for timing includes:
converting the sampling light signal into a detection voltage;
if the detection voltage input by the positive input end of the comparator is higher than the reference voltage, the comparator outputs a high level to generate a timing starting signal;
and if the detection voltage input by the positive input end of the comparator is lower than the reference voltage, the comparator outputs a low level to generate an end timing signal.
The embodiment that this application provided obtains the sampling light signal through the sampling unit, then sends to pulse detection and threshold value adjustment unit, and pulse detection and threshold value adjustment unit carry out the conversion of high-low level according to the sampling light signal that receives to generate the pilot signal of sampling timing unit, through sampling timing unit receiving pilot signal, and according to the pilot signal calculates the irradiation duration of sampling light signal. The process realizes real-time and automatic measurement of laser irradiation time based on the digital pulse measurement and intelligent communication technology of the microcontroller, can greatly shorten the working period of similar applications, reduces the workload, and is convenient for system integration and data processing; the reserved adjustment link enables the system to have strong adaptability to different application scenes.
Drawings
Fig. 1 is a schematic structural diagram of a laser irradiation time detection system provided in an embodiment of the present application;
fig. 2 is a schematic structural diagram of a sampling unit 11 according to an embodiment of the present application;
fig. 3 is a schematic structural diagram of the pulse detection and threshold adjustment unit 12 according to an embodiment of the present disclosure;
fig. 4 is a schematic structural diagram of the sampling timing unit 13 according to an embodiment of the present application;
fig. 5 is a schematic flow chart of a laser irradiation time detection method according to another embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not to be construed as limiting the invention.
Example one
Fig. 1 shows a schematic structural diagram of a laser irradiation time detection system provided by the present application, including: a sampling unit 11, a pulse detection and threshold adjustment unit 12, and a sampling timing unit 13;
the sampling unit 11 is configured to acquire a sampling optical signal and send the sampling optical signal to the pulse detection and threshold adjustment unit 12;
the pulse detection and threshold adjustment unit 12 is respectively connected to the sampling unit 11 and the sampling timing unit 13, and is configured to perform high-low level conversion according to the received sampling optical signal to generate an indication signal of the sampling timing unit 13, where the indication signal includes a start timing signal or an end timing signal;
and the sampling timing unit 13 is configured to receive the indication signal, and calculate the irradiation duration of the sampling optical signal according to the indication signal.
Optionally, the laser irradiation time detection system further includes: the communication unit is connected with the sampling timing unit;
the communication unit is used for acquiring the irradiation duration from the sampling timing unit and outputting the irradiation duration to a specified position.
Optionally, the sampling unit 11 includes a sampling prism, a detection lens connected to the sampling prism, and an attenuation sheet connected to the detection lens.
Fig. 2 shows a schematic structural diagram of a sampling unit 11 provided in the embodiment of the present application, which is mainly used to obtain an effective sampling light signal, and includes a sampling prism (e.g., a sampling mirror), a detection lens, and attenuation sheets, where the attenuation sheets include neutral optical attenuation sheets, and the sampling mirror is a partial mirror, through which a small part of energy (e.g., about 1% of energy) of an irradiation light beam is reflected to a detection light path, and is focused by the detection lens and attenuated by the optical attenuation sheets to serve as the sampling light signal. The detection circuit converts the light energy pulse into an electric signal pulse, performs edge shaping and is used for subsequent triggering of the counter; edge shaping is also beneficial for improving the time response accuracy. In the application, the laser beam is monochromatic light, and the effective optical signal, namely the sampling optical signal, is obtained by filtering out the pure laser component of the acquired optical signal after the stray light is removed.
Optionally, the pulse detection and threshold adjustment unit includes a photodetector, a D/a converter, and a comparator;
the photoelectric detector is used for inputting a detection voltage to the positive input end of the comparator according to the existence of the sampling optical signal;
the comparator outputs a high level or a low level according to a relationship between the detection voltage and a reference voltage input by the D/A converter to generate the indication signal.
Specifically, if the detection voltage input at the positive input end of the comparator is higher than the reference voltage, the comparator outputs a high level to generate a timing start signal;
and if the detection voltage input by the positive input end of the comparator is lower than the reference voltage, the comparator outputs a low level to generate an end timing signal.
Fig. 3 is a schematic structural diagram of the pulse detection and threshold adjustment unit 12 according to an embodiment of the present application; as shown, the pulse detection and threshold adjustment unit 12 consists of a photodetector, a D/a converter and a (high-speed) comparator; the photoelectric detector adopts a charge pump type high-sensitivity sensor, converts an optical signal into a detection voltage, inputs the detection voltage into the positive input end of the comparator after front-end amplification and impedance matching processing, and inputs an analog voltage output by the D/A converter into the negative input stage of the comparator by using the analog voltage as a threshold reference voltage; when no irradiation occurs, the output of the photoelectric detector is a dark noise voltage which is far lower than a threshold voltage, and the output of the comparator is a low level; when irradiation is started, the detector responds to a laser signal to generate a detection voltage higher than a threshold voltage, and the output of the comparator is rapidly inverted to a high level; the high-low level change signal of the comparator is used as the door opening/closing signal of the subsequent counter (i.e., the start timing signal and the end timing signal described above).
Optionally, the sampling timing unit 13 includes a counter, a sampling single chip, and a timing clock, and the counter is connected to the timing clock and the sampling single chip respectively;
the counter indicates the timing clock to start timing when receiving the timing starting signal;
and the sampling single chip microcomputer is also used for latching the count value of the timing clock when the timing ending signal is received, and instructing the sampling single chip microcomputer to read the count value so as to calculate the irradiation duration according to the count value.
Further, the sampling single chip microcomputer is used for resetting the counter after latching the count value of the timing clock when receiving the timing ending signal.
As shown in fig. 4, the sampling timing unit 13 includes a 64-bit counter logic (counter), a timing clock (e.g., a high-precision clock source, which can reach a precision below 1ppm at present, in microseconds, and can replace a clock source with higher precision (e.g., nanosecond) according to different tasks), and a sampling single chip microcomputer, where the counter logic can perform high-speed accumulated counting on clock pulses under the action of a door-opening signal, latch a count value and send an interrupt signal to the sampling single chip microcomputer when an event corresponding to the door-closing signal occurs, and the sampling single chip microcomputer responds to the interrupt signal, reads the count value, resets the counter, and sends out a timing result in real time through a. The communication interface adopts a serial asynchronous format multi-byte transmission counting value, and the product of the counting value and the clock period is the measured irradiation time.
Further, the communication unit is also used for setting the size of the reference voltage input to the comparator by the D/A converter according to the instruction of a user. In the application, the upper computer control instruction can be received through the communication interface, and the value of the D/A converter is modified, so that the adjustment of the trigger threshold value is realized.
The embodiment that this application provided obtains the sampling light signal through the sampling unit, then sends to pulse detection and threshold value adjustment unit, and pulse detection and threshold value adjustment unit carry out the conversion of high-low level according to the sampling light signal that receives to generate the pilot signal of sampling timing unit, through sampling timing unit receiving pilot signal, and according to the pilot signal calculates the irradiation duration of sampling light signal. The system realizes real-time and automatic measurement of laser irradiation time based on the digital pulse measurement and intelligent communication technology of the microcontroller, can greatly shorten the working period of similar applications, reduces the workload, and is convenient for system integration and data processing; the reserved adjustment link enables the system to have strong adaptability to different application scenes.
Example two
Fig. 5 shows a laser irradiation time detection method provided by an embodiment of the present application, where the laser irradiation time detection method includes:
step S51, acquiring a sampling light signal;
step S52, performing high-low level conversion according to the sampling optical signal to generate an indication signal for timing, where the indication signal includes a start timing signal or an end timing signal;
step S53, calculating the irradiation duration of the sampling light signal according to the generation time of the start timing signal and the end timing signal.
Optionally, the performing high-low level conversion according to the sampling light signal to generate an indication signal for timing includes:
converting the sampling light signal into a detection voltage;
if the detection voltage input by the positive input end of the comparator is higher than the reference voltage, the comparator outputs a high level to generate a timing starting signal;
and if the detection voltage input by the positive input end of the comparator is lower than the reference voltage, the comparator outputs a low level to generate an end timing signal.
The implementation process of the laser irradiation time detection method provided by the application refers to the working process of the laser irradiation time detection system in the first embodiment, and is not described herein again. The steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied in hardware, a software module executed by a processor, or a combination of the two. A software module may reside in Random Access Memory (RAM), memory, Read Only Memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
The above-described embodiments of the present invention should not be construed as limiting the scope of the present invention. Any other corresponding changes and modifications made according to the technical idea of the present invention should be included in the protection scope of the claims of the present invention.
Claims (10)
1. A laser irradiation time detection system, characterized by comprising: the device comprises a sampling unit, a pulse detection and threshold value adjustment unit and a sampling timing unit;
the sampling unit is used for acquiring a sampling optical signal and sending the sampling optical signal to the pulse detection and threshold value adjustment unit;
the pulse detection and threshold adjustment unit is respectively connected with the sampling unit and the sampling timing unit, and is used for performing high-low level conversion according to the received sampling optical signal to generate an indication signal of the sampling timing unit, wherein the indication signal comprises a timing starting signal or a timing ending signal;
and the sampling timing unit is used for receiving the indication signal and calculating the irradiation duration of the sampling light signal according to the indication signal.
2. The laser irradiation time detection system according to claim 1, wherein the sampling unit comprises a sampling prism, a detection lens connected to the sampling prism, and an attenuation sheet connected to the detection lens.
3. The laser irradiation time detection system according to claim 1, wherein the pulse detection and threshold adjustment unit includes a photodetector, a D/a converter, and a comparator;
the photoelectric detector is used for inputting a detection voltage to the positive input end of the comparator according to the existence of the sampling optical signal;
the comparator outputs a high level or a low level according to a relationship between the detection voltage and a reference voltage input by the D/A converter to generate the indication signal.
4. The laser irradiation time detection system according to claim 3, wherein the comparator outputs a high level or a low level according to a relationship between the detection voltage and a reference voltage input by the D/a converter to generate the indication signal, and specifically comprises:
if the detection voltage input by the positive input end of the comparator is higher than the reference voltage, the comparator outputs a high level to generate a timing starting signal;
and if the detection voltage input by the positive input end of the comparator is lower than the reference voltage, the comparator outputs a low level to generate an end timing signal.
5. The laser irradiation time detection system according to claim 3, further comprising: the communication unit is connected with the sampling timing unit;
the communication unit is used for acquiring the irradiation duration from the sampling timing unit and outputting the irradiation duration to a specified position.
6. The laser irradiation time detection system according to claim 5, wherein the communication unit is further configured to set a magnitude of the reference voltage input to the comparator by the D/A converter according to a user instruction.
7. The laser irradiation time detection system according to claim 1 or 4, wherein the sampling timing unit comprises a counter, a sampling single chip microcomputer and a timing clock, and the counter is respectively connected with the timing clock and the sampling single chip microcomputer;
the counter indicates the timing clock to start timing when receiving the timing starting signal;
and the sampling single chip microcomputer is also used for latching the count value of the timing clock when the timing ending signal is received, and instructing the sampling single chip microcomputer to read the count value so as to calculate the irradiation duration according to the count value.
8. The laser irradiation time detection system according to claim 7, wherein the sampling single-chip microcomputer is further configured to reset the counter after latching a count value of the timing clock when receiving the end timing signal.
9. A laser irradiation time detection method is characterized by comprising the following steps:
acquiring a sampling optical signal;
carrying out high-low level conversion according to the sampling optical signal to generate an indication signal for timing, wherein the indication signal comprises a timing starting signal or a timing ending signal;
and calculating the irradiation duration of the sampling light signal according to the generation time of the starting timing signal and the ending timing signal.
10. The method of claim 9, wherein the converting high and low levels according to the sampled light signal to generate an indication signal for timing comprises:
converting the sampling light signal into a detection voltage;
if the detection voltage input by the positive input end of the comparator is higher than the reference voltage, the comparator outputs a high level to generate a timing starting signal;
and if the detection voltage input by the positive input end of the comparator is lower than the reference voltage, the comparator outputs a low level to generate an end timing signal.
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| CN114486193A (en) * | 2022-01-26 | 2022-05-13 | 天津天元海科技开发有限公司 | Method, device, equipment and system for detecting light emitting period of navigation mark |
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