CN113300205A - Fiber laser protection system and device - Google Patents
Fiber laser protection system and device Download PDFInfo
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- CN113300205A CN113300205A CN202110552828.8A CN202110552828A CN113300205A CN 113300205 A CN113300205 A CN 113300205A CN 202110552828 A CN202110552828 A CN 202110552828A CN 113300205 A CN113300205 A CN 113300205A
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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
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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
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
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Abstract
The embodiment of the invention discloses a fiber laser protection system and a device, wherein the fiber laser protection system comprises: photoelectric conversion circuit, signal processing circuit and singlechip. The photoelectric conversion circuit is electrically connected with the signal processing circuit and is used for detecting the pulse optical signal output by the optical fiber laser and converting the pulse optical signal into a pulse electrical signal. The signal processing circuit is electrically connected with the single chip microcomputer, and is used for outputting a first level of a delay set time length when receiving the pulse electric signal and outputting a second level when not receiving the pulse electric signal. The singlechip is electrically connected with the amplifier of the fiber laser and used for sending a turn-off signal to the amplifier of the fiber laser when receiving the second level. The first level is opposite in polarity to the second level. By providing the optical fiber laser protection system, the laser is effectively turned off when the laser loses signal light, so that the protection of the optical fiber laser is realized.
Description
Technical Field
The embodiment of the invention relates to an optical fiber communication technology, in particular to an optical fiber laser protection system and a device thereof.
Background
The fiber laser has the unique advantages of large average power, good beam quality, high conversion efficiency, high stability and the like, and has become one of the hot spots of research in the field of laser technology. Fiber lasers are classified according to output characteristics and can be classified into continuous fiber lasers and pulse fiber lasers. The fiber pulse laser has the advantages of high peak power and the like, and is widely applied to the fields of laser marking, laser cleaning, laser radar and the like. However, when the pulse fiber laser loses signal light, if the following amplifier part is still working, the optical path of the amplification system may be burnt out due to nonlinear effects or heat accumulation, which causes serious loss. The protection measures of the existing pulse laser mainly comprise an active heat dissipation method, an active optical fiber light leakage detection method, a low-pass filtering method and a rapid AD sampling method, but all the protection measures have technical problems on a laser system due to various limitations of use scenes.
Disclosure of Invention
The embodiment of the invention provides a fiber laser protection system and a device thereof, which are used for effectively turning off a laser when laser loses signal light so as to realize protection of the fiber laser.
In a first aspect, an embodiment of the present invention provides a fiber laser protection system, where the fiber laser protection system includes: the photoelectric conversion circuit, the signal processing circuit and the singlechip are arranged;
the photoelectric conversion circuit is electrically connected with the signal processing circuit and is used for detecting a pulse optical signal output by the optical fiber laser and converting the pulse optical signal into a pulse electrical signal; the signal processing circuit is electrically connected with the singlechip and is used for outputting a first level for delaying a set time length when receiving the pulse electric signal and outputting a second level when not receiving the pulse electric signal; the singlechip is electrically connected with the amplifier of the fiber laser and used for sending a turn-off signal to the amplifier of the fiber laser when receiving the second level; the first level is opposite in polarity to the second level.
Optionally, the photoelectric conversion circuit includes a PIN photodiode and an operational amplifier;
the PIN photodiode is used for detecting a pulse optical signal output by the optical fiber laser; the output end of the PIN photodiode is electrically connected with the input end of the operational amplifier and is used for converting the pulse optical signal into a pulse electrical signal; the operational amplifier is used for amplifying the pulse electric signal by a set multiple.
Optionally, a first amplifying unit is connected in series between the input end of the operational amplifier and the output end of the operational amplifier; the first amplifying unit comprises a first resistor and a first capacitor which are arranged in parallel.
Optionally, the signal processing circuit includes a monostable flip-flop;
the output end of the operational amplifier is electrically connected with the first input end of the monostable trigger and is used for outputting a pulse electrical signal to the monostable trigger; the monostable trigger is used for outputting a first level for delaying a set time length when receiving the pulse electric signal; the monostable flip-flop is also used for outputting a second level when the pulse electric signal is not received.
Optionally, the monostable flip-flop further includes: a set terminal and a regulated voltage terminal;
the setting terminal is connected with the first end of the rheostat; the second end of the rheostat is arranged in a suspended mode; the control end of the rheostat is connected with a ground end, and a second resistor between the ground end and the setting terminal is a resistor of the rheostat access circuit; the voltage regulating terminal is respectively connected with the second end of the third resistor and the first end of the fourth resistor; the first end of the third resistor is connected with a first level; the second end of the fourth resistor is connected with the ground end so that the regulating voltage terminal obtains a regulating voltage;
the set time length is set according to the second resistor and the adjusting voltage.
Optionally, the monostable flip-flop further includes a digital-to-analog conversion unit therein; the digital-to-analog conversion unit is used for performing digital-to-analog conversion on the regulated voltage to form a four-bit digital signal; the digital signal comprises D1, D2, D3 and D4 from low order to high order;
if the digital signal D4 is zero, the second level is a low level, and the first level is a high level; if the digital signal D4 is 1, the second level is high level, and the first level is low level;
the set time length toutAs is derived from the following equation,
wherein R isSETThe resistance value of the second resistor is obtained; n is a radical ofDIVThe working frequency of the single-state trigger is set; n is a radical ofDIV＝23*D3D2D1(ii) a D3D2D1 is the value formed by the lower three bits of the digital signal.
Optionally, the monostable flip-flop is a rising edge trigger device and has a re-trigger function; the set time length toutGreater than the laser pulse period of the fiber laser.
Optionally, the single chip microcomputer includes a plurality of input ends; the signal processing circuit comprises a plurality of monostable flip-flops; the plurality of monostable triggers are respectively arranged at different positions of the optical fiber laser; the input end of the single chip microcomputer is in one-to-one correspondence with the monostable triggers;
the input end of the single chip microcomputer is used for receiving a second level output by the corresponding monostable trigger or a first level of a delay set time length; and the singlechip is used for outputting the turn-off signal to an amplifier of the optical fiber laser when receiving the second level through the first input end.
Optionally, the single chip microcomputer further includes: a plurality of temperature acquisition ports; the temperature acquisition module is used for respectively acquiring the temperatures of different positions of the optical fiber laser;
the single chip microcomputer is used for outputting the turn-off signal to an amplifier of the optical fiber laser when the temperature value acquired by the temperature acquisition port is larger than a temperature threshold value.
In a second aspect, an embodiment of the present invention further provides a fiber laser protection device, where the fiber laser protection device includes any one of the fiber laser protection systems.
The invention provides a fiber laser protection system which comprises a photoelectric conversion circuit, a signal processing circuit and a single chip microcomputer. The photoelectric conversion circuit is electrically connected with the signal processing circuit and is used for detecting the pulse optical signal output by the optical fiber laser and converting the pulse optical signal into a pulse electrical signal. The signal processing circuit is electrically connected with the single chip microcomputer, can be used for outputting a first level of a delay set time length according to the pulse electric signal and directly outputting a second level when the pulse electric signal is not received. The singlechip is electrically connected with the amplifier of the fiber laser and used for turning off the amplifier of the fiber laser by turning off the signal when receiving the second level. The signal processing circuit in the embodiment of the invention can output the second level in time when the laser signal is lost, so that the singlechip can accurately acquire the lost laser signal and effectively close the fiber laser, thereby avoiding the heating of the amplifying circuit of the fiber laser, preventing the fiber laser from being burnt out and realizing the timely protection of the fiber laser.
Drawings
To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, a brief description will be given below of the drawings required for the embodiments or the technical solutions in the prior art, and it is obvious that the drawings in the following description, although being some specific embodiments of the present invention, can be extended and extended to other structures and drawings by those skilled in the art according to the basic concepts of the device structure, the driving method and the manufacturing method disclosed and suggested by the various embodiments of the present invention, without making sure that these should be within the scope of the claims of the present invention.
Fig. 1 is a schematic structural diagram of a fiber laser protection system according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a PIN photodiode according to an embodiment of the present invention;
fig. 3 is a circuit diagram of an operational amplifier according to an embodiment of the present invention;
fig. 4 is a circuit diagram of a signal processing circuit according to an embodiment of the present invention;
fig. 5 is a schematic circuit diagram of a single chip microcomputer according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of a single chip microcomputer development tool provided in an embodiment of the present invention;
fig. 7 is a schematic structural diagram of a fiber laser protection device according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described through embodiments with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the basic idea disclosed and suggested by the embodiments of the present invention, are within the scope of the present invention.
Fig. 1 is a schematic structural diagram of a fiber laser protection system according to an embodiment of the present invention, and as shown in fig. 1, a fiber laser protection system 100 includes: photoelectric conversion circuit 101, signal processing circuit 102 and singlechip 103.
The photoelectric conversion circuit 101 is electrically connected to the signal processing circuit 102, and is configured to detect a pulse optical signal output by the fiber laser and convert the pulse optical signal into a pulse electrical signal. The signal processing circuit 102 is electrically connected to the single chip microcomputer 103, and is configured to output a first level delayed for a set time period when receiving the pulse electrical signal, and output a second level when not receiving the pulse electrical signal. The singlechip 103 is electrically connected with the amplifier of the fiber laser and is used for sending a turn-off signal to the amplifier of the fiber laser when receiving a second level; the first level is opposite in polarity to the second level.
The photoelectric conversion circuit 101 is configured to convert a received pulse optical signal into a pulse electrical signal, when the pulse laser outputs from the fiber laser, the pulse electrical signal output exists in the photoelectric conversion circuit 101 and is transmitted to the signal processing circuit 102, and the signal processing circuit 102 receives the pulse electrical signal and outputs a first level with a set time delay according to a state of the pulse electrical signal. When the fiber laser does not output the pulse laser, the photoelectric conversion circuit 101 does not output the pulse electric signal, and the pulse-free electric signal is transmitted to the signal processing circuit 102. The single chip microcomputer 103 and the signal processing module 102 are configured to receive the level signal output by the signal processing module 102, and send a corresponding control signal according to a difference of the level signal, so as to control an operation state of the fiber laser in time. When the first level is a high level, the second level is a low level; when the first level is a low level, the second level is a high level. When the single chip microcomputer 103 receives the level signal as the second level, the single chip microcomputer 103 recognizes that the level signal is different from the signal of the first level when the pulse electric signal exists, and the single chip microcomputer 103 judges that the fiber laser does not output pulse laser at the moment. The singlechip 103 sends a turn-off signal to an amplifier of the fiber laser to trigger an internal protection program, and the pumping of the amplifier is turned off at the first stage, so that a component with higher power in the fiber laser is turned off first, and the protection of the fiber amplifier is realized.
The technical scheme of this embodiment is that a protection system for a fiber laser is provided, the protection system is provided with a photoelectric conversion circuit, a signal processing circuit and a single chip microcomputer, the photoelectric conversion circuit is used for converting pulse optical signals into pulse electrical signals, the signal processing circuit correspondingly outputs a second level and a first level of a set time delay time length according to identification processing of the pulse electrical signals, and the single chip microcomputer sends different control signals to signals of different levels so as to realize timely protection of the fiber laser.
Alternatively, the photoelectric conversion circuit 101 may include a PIN photodiode and an operational amplifier; the PIN photodiode is used for detecting a pulse optical signal output by the optical fiber laser; the output end of the PIN photodiode 1011 is electrically connected with the input end of the operational amplifier and is used for converting the pulse optical signal into a pulse electrical signal; the operational amplifier is used for amplifying the pulse electric signal by a set multiple.
Fig. 2 is a schematic structural diagram of a PIN photodiode according to an embodiment of the present invention, and fig. 3 is a schematic circuit diagram of an operational amplifier according to an embodiment of the present invention, as shown in fig. 2 and fig. 3, the PIN photodiode of the PIN700 type is exemplarily illustrated in fig. 2, and the PIN photodiode has characteristics of small junction capacitance, short transit time, and high sensitivity. When the PIN photodiode identifies the pulse optical signal output by the optical fiber laser, the PIN photodiode can quickly respond to the pulse optical signal and convert the pulse optical signal into a pulse electrical signal, and the PDI-end of the PIN photodiode is electrically connected with the PDI-end of the operational amplifier, so that the pulse optical signal is transmitted, and the response speed is ensured. The photoelectric conversion circuit can be a PIN tube detection circuit based on an ultra-low bias current FFT input operational amplifier, and comprises a PIN photodiode and an operational amplifier. The operational amplifier is a circuit unit with high amplification factor, which is used to amplify the pulse electrical signal by a set factor, and its output signal can be the result of mathematical operations such as addition, subtraction or differentiation, integration, etc. of the input signal. The pulse optical signals output by the optical fiber laser are detected by using the PIN diode, and the pulse optical signals of different types can be converted into pulse electrical signals through an operational amplifier with the gain bandwidth product of 500MHz and the slew rate of 400V/us.
Optionally, a first amplifying unit may be connected in series between the input end of the operational amplifier and the output end of the operational amplifier; the first amplifying unit comprises a first resistor and a first capacitor which are arranged in parallel.
With reference to fig. 3, the first amplifying unit in the operational amplifier includes a first resistor R700 and a first capacitor C700, and the pulse signal can be amplified by the operational amplifier by controlling the resistance of the first resistor R700, so that the threshold is adjustable, and the operational amplifier can be used in different fiber lasers. However, since most of the pulse optical signals have high peak power and the amplification factor does not need to be too large, the use requirement of the fiber laser can be met, and therefore the purpose of increasing the bandwidth of the fiber laser can be achieved by using the first resistor R700 with a small resistance value.
Optionally, the signal processing circuit 102 may include a monostable flip-flop; the output end of the operational amplifier is electrically connected with the first input end of the monostable trigger and is used for outputting a pulse electrical signal to the monostable trigger; the monostable trigger is used for outputting a first level for delaying the set duration when receiving the pulse electric signal; the monostable flip-flop is also configured to output a second level when the pulsed electrical signal is not received.
Fig. 4 is a circuit diagram of a signal processing circuit according to an embodiment of the invention, and as shown in fig. 4, a monostable flip-flop can be used to provide accurate process timing, edge detection, and frequency discrimination. With continued reference to FIG. 3, the output PIN1 of the operational amplifier is electrically coupled to a first input PIN1 of a monostable flip-flop that has a steady state and a transient steady state. The first input terminal PIN1 of the monostable flip-flop receives no pulse electric signal, and the output terminal POTECT1 of the monostable flip-flop keeps a stable state and outputs a second level. Upon receipt of the pulsed electrical signal at the first input PIN1 of the monostable, the monostable may flip the pulsed electrical signal from a steady state to a transient steady state outputting a first level. Because of the existence of the delay link in the signal processing circuit 102, the temporary steady state maintains the delay setting time length and returns to the original steady state, the monostable trigger outputs the first level within the temporary steady state maintains the delay setting time length, and after the steady state is recovered, the monostable trigger continues to output the second level.
Optionally, the monostable flip-flop further includes: a SET terminal SET and a regulated voltage terminal DIV;
the setting terminal SET is connected with a first end of the rheostat; the second end of the rheostat is arranged in a suspended mode; the control end of the rheostat is connected with the ground end, and a second resistor R802 between the ground end and the SET terminal SET is a resistor of the rheostat access circuit; the adjusting voltage terminal DIV is respectively connected with the second end of the third resistor R803 and the first end of the fourth resistor R804; a first end of the third resistor R803 is connected to the first level; a second end of the fourth resistor R804 is connected with a ground end, so that the regulating voltage terminal obtains a regulating voltage; the set time period is set according to the second resistor R802 and the regulating voltage.
The output terminal POTECT1 of the monostable flip-flop outputs a first level for delaying a set time length, the length of the set time length is determined by the voltage of the second resistor R802 and the voltage of the adjusting voltage terminal DIV, and the set time length can be adjusted by changing the resistance value of the second resistor R802, so as to change the response rate. Compared with the prior art, the pulse signal is transmitted to the single chip microcomputer, and the single chip microcomputer is difficult to recognize the change of the pulse signal due to the short period of the laser pulse of the fiber laser, so that the fiber laser is controlled in time. The embodiment of the invention utilizes the monostable trigger to turn over the output pulse electrical signal and continuously set the duration, so that the singlechip can effectively identify the pulse electrical signal, the response speed is improved, the state of the current optical fiber laser is timely determined and correspondingly controlled, and the protection of the optical fiber laser is achieved.
Optionally, the monostable flip-flop further includes a digital-to-analog conversion unit therein; the digital-to-analog conversion unit is used for performing digital-to-analog conversion on the regulated voltage to form a four-bit digital signal; the digital signal comprises D1, D2, D3 and D4 from low order to high order;
if the digital signal D4 is zero, the second level is low, and the first level is high; if the digital signal D4 is 1, the second level is high, and the first level is low;
setting a time period toutAs is derived from the following equation,
wherein R isSETIs the resistance value of the second resistor; n is a radical ofDIVOperating frequency N of a one-state flip-flopDIV；NDIV＝23 *D3D2D1(ii) a D3D2D1 is the value formed by the lower three bits of the digital signal.
The digital-to-analog conversion unit in the monostable trigger is a four-bit digital-to-analog converter, the digital-to-analog conversion can be carried out on the voltage of a regulating voltage terminal DIV, the digital signal D4 at the highest position of a conversion result determines the working polarity of the monostable trigger, when the digital signal D4 at the highest position is 0, the working polarity of the monostable trigger is positive, the second level is output to be a low level, when a pulse electrical signal is input, the second level is maintained for a period of time, and the first level is output to be a high level; when the digital signal D4 of the highest bit is 0, the working polarity of the monostable flip-flop is negative, the output second level is high level, the output second level is maintained for a period of time when a pulse electrical signal is input, and the output first level is low level. The D/A conversion unit performs D/A conversion on the regulated voltage to form a four-bit digital signal, and the numerical value D3D2D1 formed by the lower three bits of the digital signal determines NDIVAccording to NDIV＝23*D3D2D1It can be seen that when D3D2D1 is 0, NDIVIs 1; if D3D2D1 is 1, NDIVIs 8; if D3D2D1 is 2, NDIVIs 64; and so on.
Optional, monostableThe state trigger can be a rising edge trigger device and has a re-triggering function; setting a time period toutGreater than the laser pulse period of the fiber laser.
The monostable flip-flop includes a rising edge trigger, a falling edge trigger, and a re-trigger function. As shown in FIG. 4, in an exemplary embodiment using a rising edge trigger device and having a re-triggering function, when a rising edge of a pulse signal arrives at the input PIN11, the level at the POTECT1 will flip and last for a set time period tout. When the working polarity of the monostable trigger is positive and a laser pulse electrical signal exists, due to the overturning characteristic of the monostable trigger on the pulse electrical signal, the set time length t for the pulse electrical signal to overturnoutThe pulse period of the laser is larger than that of the fiber laser, so that the POTECT1 end of the monostable trigger can continuously output high level; when the laser pulse signal is lost, the output of the POTECT1 end of the monostable flip-flop changes from high level to low level.
Fig. 5 is a schematic circuit diagram of a single chip microcomputer according to an embodiment of the present invention, and as shown in fig. 5, optionally, the single chip microcomputer may include a plurality of input terminals; the signal processing circuit comprises a plurality of monostable flip-flops; the monostable triggers are respectively arranged at different positions of the fiber laser; the input end of the singlechip is in one-to-one correspondence with the monostable triggers;
the input end of the singlechip is used for receiving a second level output by the corresponding monostable trigger or a first level of a delay set time length; and the singlechip is used for outputting a turn-off signal to an amplifier of the optical fiber laser when receiving the second level through the first input end.
The signal processing circuit comprises a plurality of monostable triggers, as shown in fig. 5, the POTECT1-6 of the single chip microcomputer can be electrically connected with different monostable triggers, signals of different positions of the fiber laser can be acquired, and the omnibearing protection of the fiber laser is improved.
Optionally, the single chip microcomputer may further include: a plurality of temperature acquisition ports; the temperature acquisition device is used for respectively acquiring the temperatures of different positions of the fiber laser;
the singlechip is used for outputting a turn-off signal to an amplifier of the optical fiber laser when the temperature value acquired by the temperature acquisition port is greater than a temperature threshold value.
With reference to fig. 5, the single chip microcomputer includes a plurality of temperature acquisition ports DQ1-4, which are respectively used for acquiring temperatures of different positions of the fiber laser, when the temperature is abnormal and the temperature value acquired by the temperature acquisition port of the single chip microcomputer is greater than a temperature threshold, a shutdown signal is output to an amplifier of the fiber laser, the amplifier of the fiber laser turns off a pump to protect the fiber laser, and the temperature threshold can be set according to the actual condition of the fiber laser. Meanwhile, the single chip microcomputer also comprises a plurality of current collecting ports CUR1-15 which are used for respectively collecting the current of the pump in the fiber laser, and if the current is abnormal, the single chip microcomputer can send out a control signal to control the pump to be closed. The switch of the pump is controlled by P _ EN0-15, a control signal is output to P _ EN0-15 through the single chip microcomputer, the switch of the pump can be directly controlled, the fiber laser can be quickly turned off when problems are found, and the damage risk of the fiber laser is reduced. The singlechip also comprises a SYNC port, an SCLK port and an SDI port which are SPI bus interfaces and are connected with an external digital-to-analog conversion chip, and the power of the pump can be set. The LED port of the single chip microcomputer can be electrically connected with the LED indicating circuit and used for displaying the state signal of the optical fiber laser and can be set to be lighted when the optical fiber laser has a fault, so that a worker can find and troubleshoot the fault in time and the safety of the optical fiber laser is ensured.
Fig. 6 is a schematic structural diagram of a single chip microcomputer development tool according to an embodiment of the present invention, and as shown in fig. 6, a peripheral device to be used is selected on a graphical interface and then compiled, a corresponding code is automatically generated, and the generated code is modified to complete software design of a single chip microcomputer system. UART _1-3 are asynchronous transceiver transmitters, and taking UART _1 as an example, RX _1 and TX _1 correspond to UART1_ TX and UART1_ RX in the standard signal amplitude conversion chip in fig. 5, respectively, and serve as interfaces for connecting fiber lasers. UART _1 converts data to be transmitted between serial communication and parallel communication. As a chip for converting a parallel input signal into a serial output signal, a UART is usually integrated on the connection of other communication interfaces. The current and temperature signals are connected to a digital-to-analog converter through a multiplexer, and the ADC _ SAR and the ADC _ DelSig are both digital-to-analog converters. Timer _1 is used to determine the switches of the multiplexer and determine the period of the digital-to-analog conversion. Bootloadable1 is used for using the serial ports to download the program, uses the serial ports to download the program and can revise some parameters of single chip microcomputer system after single chip microcomputer system integration, convenient and fast. The port PROTECT1 of the single chip selects the working mode as digital input, opens its interrupt isr, as shown in fig. 6 isr _1-10 can be used for interrupt, selects the interrupt mode as falling edge interrupt, connects the interrupt isr needed with the corresponding pin, and during compiling, the development tool will produce the corresponding interface program and the corresponding interrupt service program. The related functions can be completed by adding codes related to protection in the interrupt service program. The programming process of the program is greatly simplified through the graphical development tool of the single chip microcomputer, and the development period is shortened.
Fig. 7 is a schematic structural diagram of a fiber laser protection device according to an embodiment of the present invention, and as shown in fig. 7, the fiber laser protection device 200 includes any one of fiber laser protection systems 201.
The fiber laser protection device provided by the embodiment of the invention can execute the fiber laser protection system provided by the embodiment of the invention, and has the corresponding function module and beneficial effects.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious modifications, rearrangements, combinations and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (10)
1. A fiber laser protection system, comprising: the photoelectric conversion circuit, the signal processing circuit and the singlechip are arranged;
the photoelectric conversion circuit is electrically connected with the signal processing circuit and is used for detecting a pulse optical signal output by the optical fiber laser and converting the pulse optical signal into a pulse electrical signal; the signal processing circuit is electrically connected with the singlechip and is used for outputting a first level for delaying a set time length when receiving the pulse electric signal and outputting a second level when not receiving the pulse electric signal; the singlechip is electrically connected with the amplifier of the fiber laser and used for sending a turn-off signal to the amplifier of the fiber laser when receiving the second level; the first level is opposite in polarity to the second level.
2. The fiber laser protection system of claim 1, wherein the photoelectric conversion circuit includes a PIN photodiode and an operational amplifier;
the PIN photodiode is used for detecting a pulse optical signal output by the optical fiber laser; the output end of the PIN photodiode is electrically connected with the input end of the operational amplifier and is used for converting the pulse optical signal into a pulse electrical signal; the operational amplifier is used for amplifying the pulse electric signal by a set multiple.
3. The fiber laser protection system according to claim 2, wherein a first amplification unit is connected in series between an input end of the operational amplifier and an output end of the operational amplifier; the first amplifying unit comprises a first resistor and a first capacitor which are arranged in parallel.
4. The fiber laser protection system of claim 2, wherein the signal processing circuit includes a monostable trigger;
the output end of the operational amplifier is electrically connected with the first input end of the monostable trigger and is used for outputting a pulse electrical signal to the monostable trigger; the monostable trigger is used for outputting a first level for delaying a set time length when receiving the pulse electric signal; the monostable flip-flop is also used for outputting a second level when the pulse electric signal is not received.
5. The fiber laser protection system of claim 4, wherein the monostable trigger further comprises: a set terminal and a regulated voltage terminal;
the setting terminal is connected with the first end of the rheostat; the second end of the rheostat is arranged in a suspended mode; the control end of the rheostat is connected with a ground end, and a second resistor between the ground end and the setting terminal is a resistor of the rheostat access circuit; the voltage regulating terminal is respectively connected with the second end of the third resistor and the first end of the fourth resistor; the first end of the third resistor is connected with a first level; the second end of the fourth resistor is connected with the ground end so that the regulating voltage terminal obtains a regulating voltage;
the set time length is set according to the second resistor and the adjusting voltage.
6. The fiber laser protection system of claim 5,
the monostable trigger also comprises a digital-to-analog conversion unit; the digital-to-analog conversion unit is used for performing digital-to-analog conversion on the regulated voltage to form a four-bit digital signal; the digital signal comprises D1, D2, D3 and D4 from low order to high order;
if the digital signal D4 is zero, the second level is a low level, and the first level is a high level; if the digital signal D4 is 1, the second level is high level, and the first level is low level;
the set time length toutAs is derived from the following equation,
wherein R isSETThe resistance value of the second resistor is obtained; n is a radical ofDIVThe working frequency of the single-state trigger is set; n is a radical ofDIV＝23 *D3D2D1(ii) a D3D2D1 is the value formed by the lower three bits of the digital signal.
7. The fiber laser protection system of claim 6, wherein the monostable trigger is a rising edge trigger device and has a re-trigger function; the set time length toutGreater than the laser pulse period of the fiber laser.
8. The fiber laser protection system of claim 1, wherein the single-chip microcomputer includes a plurality of input terminals; the signal processing circuit comprises a plurality of monostable flip-flops; the plurality of monostable triggers are respectively arranged at different positions of the optical fiber laser; the input end of the single chip microcomputer is in one-to-one correspondence with the monostable triggers;
the input end of the single chip microcomputer is used for receiving a second level output by the corresponding monostable trigger or a first level of a delay set time length; and the singlechip is used for outputting the turn-off signal to an amplifier of the optical fiber laser when receiving the second level through the first input end.
9. The fiber laser protection system of claim 8, wherein the single-chip microcomputer further comprises: a plurality of temperature acquisition ports; the temperature acquisition module is used for respectively acquiring the temperatures of different positions of the optical fiber laser;
the single chip microcomputer is used for outputting the turn-off signal to an amplifier of the optical fiber laser when the temperature value acquired by the temperature acquisition port is larger than a temperature threshold value.
10. A fiber laser protection device, characterized in that it comprises a fiber laser protection system according to any one of claims 1 to 9.
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| CN116470376A (en) * | 2023-04-03 | 2023-07-21 | 密尔医疗科技(深圳)有限公司 | Optical fiber laser and light output control method thereof |
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| CN113300205B (en) | 2022-10-14 |
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