CN111969410A - Laser diode driving device capable of being remotely controlled in wide temperature change environment - Google Patents
Laser diode driving device capable of being remotely controlled in wide temperature change environment Download PDFInfo
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- CN111969410A CN111969410A CN202010783177.9A CN202010783177A CN111969410A CN 111969410 A CN111969410 A CN 111969410A CN 202010783177 A CN202010783177 A CN 202010783177A CN 111969410 A CN111969410 A CN 111969410A
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- laser diode
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- current
- fpga
- driving device
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/04—Processes or apparatus for excitation, e.g. pumping, e.g. by electron beams
- H01S5/042—Electrical excitation ; Circuits therefor
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21B—FUSION REACTORS
- G21B1/00—Thermonuclear fusion reactors
- G21B1/25—Maintenance, e.g. repair or remote inspection
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/10—Nuclear fusion reactors
Abstract
The invention discloses a laser diode driving device capable of being remotely controlled in a wide temperature change environment, which provides stable and reliable laser for the field calibration of a ray detector, and comprises: the aluminum material supporting structure selects a laser diode with photosensitive feedback output as a laser source, samples a photosensitive feedback signal PD to monitor the luminous intensity of the laser diode in real time, the photosensitive feedback signal PD is a current signal flowing through the laser diode, is amplified and converted into a voltage signal through an I/V conversion circuit from current to voltage, is acquired by an ADC (analog to digital converter) to convert an analog voltage signal into a digital signal, is transmitted to an FPGA (field programmable gate array), is calculated through FPGA power compensation, sends a corresponding digital signal, converts the digital signal into the analog voltage signal through the DAC, and drives a constant current source circuit to provide driving current for the laser diode.
Description
Technical Field
The invention relates to the field of on-site calibration of a ray detector and laser diode drive control, in particular to a drive device which can be used in a wide temperature change environment and can remotely control the light emitting intensity of a laser diode in real time.
Background
The international thermonuclear fusion reactor (ITER) project uses a soft X-ray camera to acquire soft X-ray radiation signals in its device, the detector of which is an LD35(24) -5T silicon photodiode detector manufactured by Centronic, uk, and the soft X-ray camera is mounted on a horizontal window of the vacuum chamber of the ITER device. Since the self-checking and calibration of the soft X-ray camera part function in the ITER device are required, a Laser Diode (LD) is used as a light source, and the self-checking and calibration function of the soft X-ray camera electronic system is realized. Because the temperature change range of the working environment of the soft X-ray camera detector and the laser diode reaches (20-45 ℃), the light intensity of the common laser diode and the laser diode driving device is unstable under the condition of temperature change, and the self-checking and calibration functions of the detector cannot be realized, a set of device which can remotely control the light intensity of the LD and can stabilize the light intensity of the LD under the condition of environment temperature change needs to be designed.
Disclosure of Invention
The invention aims to enable the laser diode to be remotely controlled in a wide temperature change environment and to enable the light emitting intensity of the laser diode to be stable.
The invention is realized by the following technical scheme: a laser diode driving device capable of being remotely controlled in a wide temperature change environment provides stable and reliable laser for field calibration of a ray detector, and the wide temperature range refers to that: 20-45 ℃; the driving device comprises:
a laser diode with photosensitive feedback output is selected as a laser source, photosensitive feedback signals PD are sampled to monitor the luminous intensity of the laser diode in real time, the photosensitive feedback signals PD are current signals flowing through the laser diode and are amplified and converted into voltage signals through an I/V conversion circuit from current to voltage, analog voltage signals are collected by an ADC (analog to digital converter) and converted into digital signals to be transmitted to an FPGA (field programmable gate array), corresponding digital signals are sent through FPGA power compensation calculation, the digital signals are converted into analog voltage signals through the DAC, and a constant current source circuit is driven to provide driving current for the laser diode.
The device further comprises a constant current source circuit for controlling the luminous intensity, a PD signal conditioning module with a laser diode photosensitive feedback signal, an ADC sampling module, a power compensation algorithm module based on an FPGA, a DAC voltage output module and an RS232 serial port module with communication with an upper computer.
Furthermore, the FPGA is used for controlling the constant current source to send out a narrow pulse current signal, the narrowest pulse reaches within 100ns, the narrow pulse laser signal is used for measuring the response rate of the detector, and meanwhile, the background noise and the baseline offset of the detector are measured; the FPGA can realize the function of quick self-calibration, an analog signal is converted into a digital signal from the ADC, the digital signal is converted into an analog signal by the DAC after FGPA processing, the processing time of the whole process is in the level of mu s, and the signal transmission time of the rest circuits is in the level of ns.
Furthermore, the upper computer is used for remotely configuring the parameters of the driving current, the working mode, the limiting current and the limiting voltage of the laser diode, monitoring and displaying the current of the photosensitive feedback signal PD in real time, and the damage of the laser diode caused by overcurrent or overvoltage in the use process is avoided by setting the working limit protection parameters;
the control of the laser diode includes two modes of operation, one is a constant optical power mode and the other is a constant drive current mode.
Furthermore, the FPGA is used for realizing information interaction with an upper computer through 232 communication, the current provided for the laser diode LD is changed in real time, the data precision is in the per mille level, the running state of the laser diode LD, including the input current provided for the laser diode LD and the feedback current of the photosensitive feedback signal PD, is collected and displayed in real time, the data precision is in the per mille level, the on-line switching of the running mode of the laser diode is realized, and the current-limiting protection peak value realized by the laser diode is changed on line.
Further, the use of a Raymond joint to connect the device to a laser diode increases maintenance efficiency while the device is small in size: 104mm is multiplied by 76mm is multiplied by 46mm, and the radiation detector can normally work by supplying power through a mini USB 5V interface, so that the radiation detector can conveniently work in a field calibration mode.
Furthermore, the LED lamp is provided with an aluminum material supporting structure, the input and output signals of the electronic board card for controlling the luminous intensity of the laser diode and a power interface are both designed on the side surface of the aluminum shell, the signal interface is plugged through a Lemo 3 core direct plug-in connector, and the power interface is a USB port.
Furthermore, the electronic board card for controlling the light emitting intensity of the laser diode is communicated with an upper computer through an RS232 interface, the board card is controlled by selecting a mode and setting the current magnitude and the limiting value through the upper computer, and the logic bytes transmitted by the FPGA are seen through the interface of the upper computer.
Furthermore, under the condition of different temperatures, the feedback current of the PD base pin of the laser diode changes, and the electronic board card for controlling the luminous intensity of the laser diode adjusts the driving current of the laser diode through collecting the feedback current change of the PD base pin, so that the luminous intensity of the laser diode is compensated.
The invention has the advantages that:
the invention has two modes of driving the laser diode, one mode is to adjust through PD feedback current signals, and the other mode is to actively control the driving current by an operator on an upper computer; the invention has wide temperature change environment to adjust the light emitting power of the laser diode, the PD feedback current can be changed in the temperature change environment, and the adjustment of the driving current of the laser diode is realized through the change of the feedback current, thereby realizing the adjustment of the light emitting power. The invention has the function of remotely controlling the light-emitting power of the laser diode, and the accuracy of the set parameters and the actual numerical value is in the thousandth level. The invention has real-time responsiveness, and the response time is in the level of mu s. The invention can control the laser diode to emit narrow pulse laser through the FPGA, and can be used for measuring parameters such as response rate of the detector, background noise, baseline offset and the like; by setting the working limit protection parameters, the damage of the laser diode caused by overcurrent or overvoltage in the use process can be avoided; the invention has low power consumption and cost.
Drawings
FIG. 1 is a block diagram of the present invention;
FIG. 2 is a block diagram of the FPGA internal module of the present invention;
FIG. 3 is a data reading diagram of the upper computer interface according to the present invention;
FIG. 4 is a data layout diagram of the upper computer interface according to the present invention;
fig. 5 is a diagram of an electronic board of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, rather than all embodiments, and all other embodiments obtained by a person skilled in the art based on the embodiments of the present invention belong to the protection scope of the present invention without creative efforts.
According to an embodiment of the invention, a driving device capable of remotely controlling the light emitting intensity of a laser diode in an environment with large temperature change is provided, and the driving device can be applied to the field of laser diode light emitting intensity control research. The device can control the luminous intensity of the laser diode and has the functions of communicating with an upper computer and the like. Specific requirements such as device expansibility and maintenance convenience.
According to an embodiment of the present invention, a laser diode driving device capable of being remotely controlled in a wide temperature variation environment includes an aluminum external supporting structure, a module having an RS232 interface for communicating with an upper computer, a USB interface for supplying power, a ralmer connector for connecting a laser diode and a board card, and an output board card having an I/V conversion circuit, an ADC, an FPGA, a DAC circuit, and a constant current source circuit, as shown in fig. 5, which is a physical diagram of an electronic board card.
The electronic board card for controlling the luminous intensity of the laser diode is provided with input and output signals and a power interface which are designed on the side surface of the aluminum shell, the signal interface is plugged through a Lemo 3-core direct plug-in connector, and the power interface is a USB interface.
According to the electronic board card for controlling the luminous intensity of the laser diode, the laser diode PD sends monitoring current, a current signal is converted into a voltage signal through the I/V conversion circuit and amplified, the voltage signal is collected and output to the FPGA through the ADC, the luminous intensity of the laser diode is controlled in different modes through the FPGA power compensation module, the voltage is output to the constant current source circuit through the DAC, the output current is a constant value, and power is supplied to the laser diode.
The electronic board card for controlling the light-emitting intensity of the laser diode can selectively use the FPGA power compensation module to adjust the light-emitting intensity of the laser diode through a PD current feedback signal, and an operator can also actively control the light-emitting intensity of the laser diode through an upper computer to adjust the driving current of the laser diode. Fig. 2 is a diagram showing the structure of the internal module of the FPGA according to the present invention.
The electronic board card for controlling the light intensity of the laser diode is communicated with an upper computer through an RS232 interface, the electronic board card can be controlled by selecting a mode and setting the current magnitude and the limiting value through the upper computer, and the logical bytes transmitted by the FPGA can be seen through the interface of the upper computer, as shown in figures 3-4, the electronic board card is the upper computer control interface of the invention.
Under different temperature conditions, the feedback current of the PD base pin of the laser diode changes, and the electronic board card for controlling the luminous intensity of the laser diode adjusts the driving current of the laser diode by collecting the feedback current change of the PD base pin, so that the luminous intensity of the laser diode is compensated.
As shown in fig. 1, the working principle of the device of the present invention is: the laser diode PD monitoring circuit comprises a constant current source circuit, an ADC (analog-to-digital converter) circuit, an FPGA (field programmable gate array), a DAC (digital-to-analog converter) circuit, a constant current source circuit, an I/V (analog-to-digital) conversion circuit, an ADC (analog-to-digital converter) circuit, an FPGA (field programmable gate array), a DAC) circuit and a constant current source circuit. Through the communication of RS232 interface and host computer, can select the constant current source mode and set up electric current size and restriction value through the host computer and control the integrated circuit board to can see the logical byte of FPGA transmission through the host computer interface.
The FPGA power compensation module comprises two selection modes, wherein one mode is a constant current source mode, and the other mode is a constant power mode. In the constant current source mode, the signal output by the FPGA is changed according to the PD feedback current signal; in the constant power mode, signals output by the FPGA are written by an operator through the upper computer. In the environment of temperature variation, the PD feedback current signal changes with the temperature variation, and the driving current is adjusted based on the change, so as to adjust the light emitting intensity.
Although illustrative embodiments of the present invention have been described above to facilitate the understanding of the present invention by those skilled in the art, it should be understood that the present invention is not limited to the scope of the embodiments, but various changes may be apparent to those skilled in the art, and it is intended that all inventive concepts utilizing the inventive concepts set forth herein be protected without departing from the spirit and scope of the present invention as defined and limited by the appended claims.
Claims (9)
1. A laser diode driving device capable of being remotely controlled in a wide temperature change environment provides stable and reliable laser for field calibration of a ray detector, and the wide temperature range refers to that: 20-45 ℃; characterized in that, the driving device comprises:
the aluminum material supporting structure selects a laser diode with photosensitive feedback output as a laser source, samples a photosensitive feedback signal PD to monitor the luminous intensity of the laser diode in real time, the photosensitive feedback signal PD is a current signal flowing through the laser diode, the current signal is amplified by an I/V conversion circuit from current to voltage and converted into a voltage signal, an ADC acquires the voltage signal and converts the analog voltage signal into a digital signal, the digital signal is transmitted to an FPGA, the FPGA power compensation calculation is carried out, the digital signal is converted into an analog voltage signal by the DAC, and a driving constant current source circuit provides driving current for the laser diode.
2. The laser diode driving device capable of being remotely controlled in a wide temperature variation environment according to claim 1, wherein:
the LED constant current source device comprises a constant current source circuit for controlling the luminous intensity, a laser diode photosensitive feedback signal PD signal conditioning module, an ADC sampling module, a power compensation algorithm module based on an FPGA, a DAC voltage output module and an RS232 serial port module which is communicated with an upper computer.
3. The laser diode driving device capable of being remotely controlled in a wide temperature variation environment according to claim 1, wherein:
the FPGA is used for controlling the constant current source to send out a narrow pulse current signal, the narrowest pulse reaches within 100ns, the narrow pulse laser signal is used for measuring the response rate of the detector, and meanwhile, the background noise and the baseline offset of the detector are measured; the FPGA can realize the function of quick self-calibration, an analog signal is converted into a digital signal from the ADC, the digital signal is processed by the FPGA and then is converted into an analog signal by the DAC, the processing time of the whole process is in the level of mu s, and the signal transmission time of the rest circuits is in the level of ns.
4. The laser diode driving device capable of being remotely controlled in a wide temperature variation environment according to claim 1, wherein:
the method comprises the steps that the upper computer is used for remotely configuring the settings of parameters of driving current, working mode, limiting current and limiting voltage of the laser diode, monitoring and displaying the current of a photosensitive feedback signal PD in real time, and setting working limit protection parameters to avoid the damage of the laser diode caused by overcurrent or overvoltage in the using process;
the control of the laser diode includes two modes of operation, one is a constant optical power mode and the other is a constant drive current mode.
5. The laser diode driving device capable of being remotely controlled in a wide temperature variation environment according to claim 1, wherein:
the FPGA is used for realizing information interaction with an upper computer through 232 communication, the current provided for the laser diode LD is changed in real time, the data precision is in the per mille level, the running state of the laser diode LD, including the input current provided for the laser diode LD and the feedback current of the photosensitive feedback signal PD, is collected and displayed in real time, the data precision is in the per mille level, the on-line switching of the running mode of the laser diode is realized, and the current-limiting protection peak value realized by the laser diode is changed on line.
6. The laser diode driving device capable of being remotely controlled in a wide temperature variation environment according to claim 1, wherein:
the use of a Raymond joint to connect the device to a laser diode increases maintenance efficiency while the device is small in size: 104mm is multiplied by 76mm is multiplied by 46mm, and the radiation detector can normally work by supplying power through a miniUSB 5V interface, so that the radiation detector can conveniently work in a field calibration mode.
7. The laser diode driving device capable of being remotely controlled in a wide temperature variation environment according to claim 1, wherein:
the electronic board card for controlling the luminous intensity of the laser diode is provided with input and output signals and a power interface which are designed on the side surface of the aluminum shell, the signal interface is plugged through a Lemo 3-core direct plug-in connector, and the power interface is a USB interface.
8. The laser diode driving device capable of being remotely controlled in a wide temperature variation environment according to claim 1, wherein:
the electronic board card for controlling the luminous intensity of the laser diode is communicated with an upper computer through an RS232 interface, the board card is controlled through the mode selection of the upper computer and the setting of the current magnitude and the limiting value, and the logic bytes transmitted by the FPGA are seen through the interface of the upper computer.
9. The laser diode driving device capable of being remotely controlled in a wide temperature variation environment according to claim 1, wherein:
under different temperature conditions, the feedback current of the PD base pin of the laser diode changes, and the electronic board card for controlling the luminous intensity of the laser diode adjusts the driving current of the laser diode through collecting the feedback current change of the PD base pin, so that the luminous intensity of the laser diode is compensated.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010783177.9A CN111969410A (en) | 2020-08-06 | 2020-08-06 | Laser diode driving device capable of being remotely controlled in wide temperature change environment |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010783177.9A CN111969410A (en) | 2020-08-06 | 2020-08-06 | Laser diode driving device capable of being remotely controlled in wide temperature change environment |
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| CN111969410A true CN111969410A (en) | 2020-11-20 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1883089A (en) * | 2004-01-15 | 2006-12-20 | 松下电器产业株式会社 | Optical transmitter |
| US20070280314A1 (en) * | 2006-06-01 | 2007-12-06 | Yong-Chan Keh | Integrated circuit for driving a light source |
| US20130077646A1 (en) * | 2007-09-28 | 2013-03-28 | Jiaxi Kan | Automatic modulation control for maintaining constant extinction ratio (er), or constant optical modulation amplitude (oma) in an optical transceiver |
| CN109638636A (en) * | 2017-10-09 | 2019-04-16 | 科大国盾量子技术股份有限公司 | One kind is for semiconductor laser control and state monitoring apparatus |
| CN111224316A (en) * | 2020-02-20 | 2020-06-02 | 中国科学院合肥物质科学研究院 | Semiconductor laser driving system and loop noise suppression method with online adjustable parameters |
-
2020
- 2020-08-06 CN CN202010783177.9A patent/CN111969410A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1883089A (en) * | 2004-01-15 | 2006-12-20 | 松下电器产业株式会社 | Optical transmitter |
| US20070280314A1 (en) * | 2006-06-01 | 2007-12-06 | Yong-Chan Keh | Integrated circuit for driving a light source |
| US20130077646A1 (en) * | 2007-09-28 | 2013-03-28 | Jiaxi Kan | Automatic modulation control for maintaining constant extinction ratio (er), or constant optical modulation amplitude (oma) in an optical transceiver |
| CN109638636A (en) * | 2017-10-09 | 2019-04-16 | 科大国盾量子技术股份有限公司 | One kind is for semiconductor laser control and state monitoring apparatus |
| CN111224316A (en) * | 2020-02-20 | 2020-06-02 | 中国科学院合肥物质科学研究院 | Semiconductor laser driving system and loop noise suppression method with online adjustable parameters |
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Application publication date: 20201120 |
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