WO2021052176A1 - Optical fiber laser device protection method and optical fiber laser device - Google Patents

Abstract

The present application relates to the field of optical fiber laser devices. Disclosed are an optical fiber laser device protection method and an optical fiber laser device. The method comprises: determining a working state of a pumping source; when the working state of the pumping source is a state of having output a laser, acquiring a detection signal, wherein the detection signal is used for indicating a transmission state of the laser being transmitted in an optical fiber; and generating protection information when the detection signal satisfies a preset protection condition. A light emission situation of a pumping source is detected by means of detecting a current signal in the pumping source, a detection signal is acquired after the pumping source normally outputs a laser, and protection information is quickly generated when the detection signal satisfies a preset protection condition, such that the degree of damage of an optical fiber laser device is reduced.

Description

Fiber laser protection method and fiber laser Technical field

This application relates to the field of fiber lasers, and in particular to a fiber laser protection method and fiber lasers.

Background technique

Fiber lasers can be divided into low-power fiber lasers, medium-power fiber lasers, high-power fiber lasers, and ultra-high-power fiber lasers according to their optical power.

When the fiber laser adopts the multi-level optical path scheme, the pump switching timing between the levels needs to be strictly controlled, otherwise it is easy to burn the fiber or even the pump source. According to experience, even if the timing control of the pump sources at all levels is very good, due to various external factors, fiber burning will still occur from time to time.

In the process of realizing this application, the inventor found that related technologies have the following problems: When fiber burning occurs, timely and reliable protection and protection mechanisms become very important and critical.

Application content

An objective of the embodiments of the present application is to provide a fiber laser protection method and fiber laser, which can reliably protect the fiber laser.

In order to solve the above technical problems, this application provides the following technical solutions:

In a first aspect, an embodiment of the present application provides a method for protecting a fiber laser. The fiber laser includes at least one level of optical path system, and each level of the optical path system includes at least one pump source and an optical fiber, and the method includes:

Determining the working state of the pump source;

When the working state of the pump source is the laser output state, acquiring a detection signal, where the detection signal is used to indicate the transmission state of the laser in the optical fiber;

When the detection signal meets a preset protection condition, protection information is generated.

Optionally, the working state includes the laser output state or the laser non-output state:

When the current signal flowing through the pump source is acquired, determining that the working state of the pump source is the laser output state;

When the current signal flowing through the pump source is not obtained, it is determined that the working state of the pump source is the laser non-output state, wherein the current signal is used to drive the pump source to output laser light.

Optionally, the determining that the working state of the pump source is the laser output state includes:

Judging whether the current signal is greater than or equal to a preset current threshold;

If yes, select the working state of the pump source as the laser output state;

If not, select the working state of the pump source as the laser not output state.

Optionally, the selecting the working state of the pump source as the laser output state includes:

Pre-set current flag bit;

According to the current signal and the preset current threshold, the current flag bit is updated, wherein the current flag bit can be replaced with a first flag value or a second flag value, and the first flag value is used to indicate the The current signal is greater than or equal to the preset current threshold, and the second flag value is used to indicate that the current signal is less than the preset current threshold;

When the flag value of the current flag bit is the first flag value, selecting the working state of the pump source as the laser output state;

When the flag value of the current flag bit is the second flag value, the working state of the pump source is selected as the laser non-output state.

Optionally, the current signal is obtained by setting a sampling resistor connected in series with the pump source.

Optionally, the optical path system of each stage of the fiber laser further includes at least one photodiode detector, and the detection signal is converted and output by the photodiode detector.

Optionally, the generating protection information when the detection signal meets a preset protection condition includes:

When the level type of the detection signal is a preset level type, generating protection information;

When the level type of the detection signal is not a preset level type, the loop detection state is entered.

Optionally, when the level type of the detection signal is a preset level type, generating protection information includes:

Determine whether the level type of the detection signal within the preset time period is a preset level type;

If yes, generate protection information.

Optionally, the protection information includes faulty component information, and the generating protection information includes:

Acquiring light emission control information, where the light emission control information is used to control the pump source to generate laser light;

According to the light emission control information, faulty component information is generated, and the faulty component information is encapsulated in the protection information.

Optionally, the light emission control information includes multiple control signals for controlling the working state of the pump source, and the control signals include a Control signal, an EN enable signal, a 0-10V power setting signal, and PWM modulation. signal.

Optionally, the light emission control information includes light emission information or non-light emission information, the faulty component information includes hardware fault information or light path fault information, and the generating of the faulty component information according to the light emission control information includes:

When the light emission control information belongs to the light emission information, determining that the faulty component information is light path fault information;

When the light emission control information belongs to the non-light emission information, it is determined that the faulty component information is hardware fault information.

Optionally, when the light emission control information is the light emission information, the method further includes:

Obtain the detection signals of the optical system at all levels;

According to the detection signals of the optical path systems at all levels, fault location information is generated.

Optionally, the fiber laser is composed of a two-level optical path system, and the generation of fault location information according to the detection signal of the optical path system at each level includes:

When the detection signal of the first-level optical path system meets the preset protection condition, and the detection signal of the second-level optical path system does not meet the preset protection condition, generate the first type of fault information;

When the detection signal of the first-level optical path system does not meet the preset protection condition, and the detection signal of the second-level optical path system meets the preset protection condition, generating the second type of fault information;

When the respective detection signals of the first-level optical path system and the second-level optical path system meet the preset protection conditions, a third type of fault information is generated.

In the second aspect, an embodiment of the present application provides a fiber laser, including:

At least one-level optical path system, including one or more pump sources and optical fibers, the pump sources are used to output laser light, and the laser light can be transmitted in the optical fiber;

A driving circuit for driving the optical path system to work; and,

The control circuit is respectively connected with the optical path system and the drive circuit, wherein the control circuit includes:

At least one processor, respectively connected to the optical path system and the drive circuit; and,

A memory that is communicatively connected to the at least one processor; wherein the memory stores an instruction program executable by the at least one processor, and the instruction program is executed by the at least one processor so that the at least one The processor executes the fiber laser protection method.

In each embodiment of the present application, the light output of the pump source is detected by detecting the current signal in the pump source. After the pump source normally outputs the laser, the detection signal of the PD detector is obtained. When the conditions are protected, protection information is generated. When the pump source is working normally, the detection signal of the PD detector is detected within a certain period of time to determine the laser transmission in the fiber, and the protection information is quickly generated for abnormal conditions, thereby reducing the damage of the fiber laser And reliably protect the fiber laser.

Description of the drawings

One or more embodiments are exemplified by the pictures in the corresponding drawings. These exemplified descriptions do not constitute a limitation on the embodiments. The elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the attached drawings do not constitute a scale limitation.

FIG. 1 is a structural block diagram of a fiber laser provided by an embodiment of the application;

2 is a flowchart of a method for protecting a fiber laser according to an embodiment of the application;

2a is a flowchart of a method for protecting a fiber laser according to another embodiment of this application;

2b is a flowchart of a method for protecting a fiber laser according to another embodiment of this application;

FIG. 3 is a flowchart of a method for protecting a fiber laser according to another embodiment of this application;

FIG. 3a is a flowchart of a method for protecting a fiber laser according to another embodiment of this application;

4 is a flowchart of a method for protecting a fiber laser according to another embodiment of this application;

FIG. 5 is a flowchart of a method for protecting a fiber laser according to another embodiment of this application;

FIG. 6 is a schematic diagram of a secondary optical path of a fiber laser according to another embodiment of the application.

detailed description

In order to make the purpose, technical solutions, and advantages of this application clearer, the following further describes this application in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present application, and are not used to limit the present application.

Figure 1 is a structural block diagram of a fiber laser provided by an embodiment of this application. The fiber laser 10 shown in this figure can be used to implement the fiber laser protection method provided by the embodiment of this application. Please refer to Figure 1. The fiber laser 10 is controlled by The circuit 11, the driving circuit 12, and at least one level of optical path system 13 are formed, wherein the driving circuit 12 is connected to the optical path system 13 for driving the optical path system 13 to work, and the control circuit 11 is connected to the driving circuit 12 and the optical path system 13 respectively, and the control circuit 11 sends a drive signal to the drive circuit 12 so that the drive circuit 12 drives the optical path system 13 to work. When the optical path system 13 generates a protection signal, the optical path system 13 feeds back the protection signal to the control circuit 11, so that the control circuit 11 responds to the The protection signal starts the relevant protection program.

In practical applications, the occurrence of a protection signal includes but is not limited to the following situations: fiber burnt, broken fiber, component failure or faulty protection, etc. Starting the related protection program may be that after the control circuit 11 receives the protection signal, it stops sending the driving signal to the driving circuit 12 to stop the operation of the optical path system 13.

The optical path system 13 is mainly composed of a pump source 131, a photodiode detector 132, and several other components. Among them, the pump source 131 receives a driving signal from the driving circuit 12 to output a pump laser, and the output laser is transmitted in the optical path system . The photodiode detector 132 is used to detect the transmitted laser light. When a certain intensity of laser light passes through the photodiode detector 132, the output signal of the photodiode detector 132 will change, and the laser light will be judged according to the output signal of the photodiode detector 132. The transmission situation in the optical fiber.

The control circuit 11 is respectively connected to the optical path system 13 and the drive circuit 12, wherein the control circuit includes:

At least one processor, respectively connected to the optical path system and the drive circuit; and,

A memory that is communicatively connected to the at least one processor; wherein the memory stores an instruction program executable by the at least one processor, and the instruction program is executed by the at least one processor so that the at least one The processor executes the fiber laser protection method.

It can be understood that, as a non-volatile computer-readable storage medium, the memory can be used to store non-volatile software programs, non-volatile computer-executable programs, and modules. The processor executes various functional applications and data processing of the server by running non-volatile software programs, instructions, and modules stored in the memory, that is, realizing the fiber laser protection method in the following embodiments.

The memory may include a storage program area and a storage data area. The storage program area may store an operating system and an application program required by at least one function; the storage data area may store data created according to the use of the coupon message pushing device. In addition, the memory may include a high-speed random access memory, and may also include a non-volatile memory, such as at least one magnetic disk storage device, a flash memory device, or other non-volatile solid-state storage devices.

Specifically, for the specific method of fiber laser protection, refer to the description of the following embodiments.

Please continue to refer to FIG. 2. FIG. 2 is a flowchart of a method for protecting a fiber laser according to an embodiment of the application. The method includes the following steps:

Step 21: Determine the working state of the pump source, where the working state includes a laser output state or a laser non-output state;

The pump source is the current source that makes the laser working medium reach the particle number inversion. The common pumping methods mainly include electric pumping, chemical pumping, optical pumping and pneumatic pumping. In this application, the pumping source adopts It is an electric pump. As the source of laser output, the pump source will only produce laser light when the working current is supplied normally. Therefore, if the pump is not damaged, as long as there is a current that satisfies the light-emitting condition through the pump source, the pump source will generate laser output accordingly. Therefore, when performing laser function testing, the working state of the pump source should be determined first.

The laser output state means that the current in the pump source meets its light-emitting conditions, thereby outputting the laser. The laser non-output state means that the current of the pump source is less than the working current or there is no current input, and the pump source fails to output laser.

Step 22: Obtain a detection signal when the working state of the pump source is the laser output state, where the detection signal is used to indicate the transmission state of the laser in the optical fiber;

The laser output state means that the pump source works at the working current to output the laser, and the output laser is transmitted in the optical fiber, and the photodiode (PD) detector is used to detect the intensity of the light, so as to understand the laser transmission in the optical fiber. Happening. In this embodiment, the detection signal is the detection signal of the PD. When a certain intensity of light emitted by the pump source passes through the PD detector, the output signal in the PD changes. The laser transmission is determined by the change of the output signal. situation.

Step 23: When the detection signal meets a preset protection condition, generate protection information.

The preset protection condition means that the PD detector does not detect the light intensity signal within a certain period of time after the pump source emits a certain intensity laser. When the preset protection conditions are met, it indicates that the laser transmission in the optical fiber has caused abnormal conditions such as fiber burning or fiber breakage. The PD detector feeds back the abnormal detection signal to the control circuit, and the control circuit generates corresponding protection information according to the detection signal .

Among them, there are many forms of protection information, including alarm information. Specifically, it may include stopping outputting the drive signal to the drive circuit in time after receiving the abnormal detection signal, and turning off the power supply to make the pump source work when the laser is not output. Status; or, notify relevant staff through protection signals such as signal indicators, buzzers, and vibration signals for processing.

In this embodiment, the light output of the pump source is detected by detecting the current signal in the pump source. After the pump source normally outputs the laser, the detection signal of the PD detector is obtained. If the detection signal meets the preset protection condition When the protection information is generated. When the pump source is working normally, the detection signal of the PD detector is detected within a certain period of time to determine the laser transmission in the fiber, and timely protection information is sent out for abnormal conditions, thereby reducing the degree of damage to the fiber laser .

In order to accurately obtain the working state of the pump source, where the working state of the pump source includes the laser output state or the laser non-output state, in some embodiments, please refer to FIG. 2a, which is provided in an embodiment of the application. A flow chart of a method for protecting a fiber laser, determining the working state of the pump source, includes the following steps:

Step 211: When the current signal flowing through the pump source is acquired, determine that the working state of the pump source is the laser output state;

Step 212: When the current signal flowing through the pump source is not obtained, determine that the working state of the pump source is the laser non-output state, wherein the current signal is used to drive the pump source Output laser.

The working state of the pump source is determined by the current signal. If a current signal is detected in the pump source and the working state of the pump source is the laser output state, the laser starts the above protection method; if the pump source is not detected If the working state of the pump source is the laser not output state, the laser will not enter the process of the protection method. The pump source is the source of the laser output, which plays a vital role in the detection of the laser.

In this embodiment, the current signal of the present application can be obtained by setting a sampling resistor in series with the pump source. Specifically, the pump source is calculated according to the voltage value provided to the pump source and the resistance value obtained by the sampling resistor的current signal.

In this embodiment, because the pump source is the source of the laser output, in the laser detection process, the current signal in the pump source is detected to determine the light output state of the laser, which provides a basis for the laser delivery detection of the laser .

In some embodiments, when an abnormal condition occurs during the transmission of the laser through the optical fiber, that is, when the level type of the detection signal is a preset level type, the protection information is generated. Among them, the detection signal is the detection signal of the PD detector, and the PD detector converts the light detection signal into a level signal and feeds it back to the controller. The preset level type is used to indicate that the PD detector does not detect the laser signal in the optical fiber. The controller compares the acquired detection signal with the preset level type. If they are equal, it indicates that the laser transmission in the optical fiber is abnormal. At this time, the controller generates corresponding protection information to be able to deal with the abnormal situation in time.

In order to detect abnormal situations in time and perform rapid processing, in other embodiments, please refer to FIG. 2b. FIG. 2b is a flowchart of a fiber laser protection method provided by an embodiment of this application. When the signal level type is the preset level type, generating protection information includes the following steps:

Step 231: Determine whether the level type of the detection signal within the preset time period is a preset level type;

The preset duration is to set the length of time for laser transmission. Within this duration, the laser signal in the fiber can be normally transmitted from the pump source to the position of the PD detector. Therefore, the preset duration is used to indicate the laser signal. Pass the time data normally.

Step 232: If yes, generate protection information.

Within the preset time period, if the level type of the detection signal corresponding to the PD detector is the preset level type, the preset level type is used to indicate that the PD detector does not detect the laser signal. It can be seen that the laser signal is in the optical fiber. An abnormal situation occurred during delivery. At this time, the controller will generate protection information.

In this embodiment, the preset duration is set, and the current flag signal of the pump source and the level type of the PD detector are successively acquired within the preset duration to determine whether there is an abnormality when the laser is transmitted in the optical fiber.

In other embodiments, when the level type of the detection signal is a preset level type, generating protection information further includes the following steps:

Step 233: When the level type of the detection signal is not a preset level type, enter a loop detection state.

The non-preset level type is used to indicate that the PD detector detects the laser signal, that is, the laser signal output from the pump source is transmitted to the PD detector position in the optical fiber as scheduled. At this time, the system will enter the next laser delivery detection, first obtain the current flag signal in the pump source, if the current flag signal is the first flag value, set the preset duration, within the preset duration, get PD detection again The level type of the detector, the cycle detection process is completed by judging the current flag signal and the PD detection signal obtained cyclically.

In this embodiment, if the level type of the acquired detection signal is not the preset level type, that is, when there is no abnormality in the transmission of the laser in the optical fiber, the system enters the loop detection state, thereby ensuring the stability of the laser operation Sex.

It is understandable that when the current signal in the pump source reaches a certain threshold, the pump source can output laser light.

In some embodiments, please refer to FIG. 3. FIG. 3 is a flowchart of a fiber laser protection method provided by an embodiment of the application. The determining that the working state of the pump source is the laser output state includes the following step:

Step 31: Determine whether the current signal is greater than or equal to a preset current threshold;

The preset current threshold refers to the working current level of the pump source, and the pump source works in a laser output or non-output state according to the working current level. The current signal is output from the driving circuit to the pump source, that is, the current signal is the real-time signal of the pump source. The laser output is determined by comparing the real-time signal in the pump source with the preset current threshold.

Step 32: If yes, select the working state of the pump source as the laser output state;

Step 33: If not, select the working state of the pump source as the laser not output state.

If the current signal is greater than or equal to the preset current threshold, the pump source is in a normal working state. At this time, the pump source outputs a stable laser; on the contrary, the current signal in the pump source cannot reach the working signal, and the pump source cannot Output laser. Therefore, by comparing the magnitude of the current signal with the preset current threshold, the light output of the pump source can be determined.

In this embodiment, the preset current threshold is set according to the pump source, and the laser output of the pump source is determined by comparing the preset current threshold with the magnitude of the current signal, which improves the judgment of the working state of the pump source. accuracy.

If it is determined that the current signal is greater than or equal to the preset current threshold, after the pump source outputs a stable laser, in some embodiments, please refer to FIG. 3a. FIG. 3a is a flow chart of a fiber laser protection method provided by an embodiment of the application As shown in the figure, the selection of the working state of the pump source as the laser output state includes the following steps:

Step 321: preset the current flag bit;

The current flag is used to indicate the relationship between the current signal in the pump source and the preset current threshold. The control circuit obtains the current flag data to determine the current working condition of the pump source.

Step 322: Update the current flag bit according to the current signal and the preset current threshold, where the current flag bit can be replaced with a first flag value or a second flag value, and the first flag value is used for Indicating that the current signal is greater than or equal to the preset current threshold, and the second flag value is used to indicate that the current signal is less than the preset current threshold;

The switching between the first flag value and the second flag value is used to indicate the transition of the pumping source working state. It is understandable that both the first flag value and the second flag value are values that can be recognized by the control circuit. Among them, the first flag value is a high-level signal, and the second flag value is a low-level signal. When the acquired current flag is a high-level signal, the current signal in the pump source is greater than or equal to the preset current threshold; when the acquired current flag is a low-level signal, the current signal in the pump source Less than the preset current threshold.

Step 323: When the flag value of the current flag bit is the first flag value, select the working state of the pump source as the laser output state; when the flag value of the current flag bit is the first flag value When the two flag values are used, the working state of the pump source is selected as the laser not output state.

In this embodiment, the current flag bit is replaced by the first flag value or the second flag value to indicate the current change in the pump source. When the current signal is greater than or equal to the preset current threshold, The current flag bit is the first flag value; when the current signal is less than the preset current threshold value, the current flag bit is the second flag value. The control circuit determines the current working condition of the pump source by obtaining the data of the current flag bit.

In some embodiments, the detection signal includes an electrical signal.

The detection signal is converted and output by the PD detector. The PD detector generates a weak current signal proportional to the brightness of the light, and then a preamplifier converts the current signal into a usable voltage signal, thus completing the transition from optical signal to electrical Signal conversion process.

In other embodiments, the protection information also includes faulty component information. Please refer to FIG. 4. FIG. 4 is a flowchart of a method for protecting a fiber laser according to an embodiment of the application. As shown in FIG. The information includes the following steps:

Step 41: Obtain light emission control information;

Step 42: Generate faulty component information according to the light emission control information.

In this embodiment, the light emission control information is used to control the pump source to generate laser light. When the light emission control information is driving information for driving the pump source to work, the pump source generates laser light according to the light emission control information. However, when the optical path fails, the laser will generate protection information even if the pump source receives the light emission control information.

When the light emission control information is the work information for stopping the pumping source, the pump source stops generating laser light according to the light emission control information. However, when a hardware failure occurs, even if the pump source does not receive the light emission control information, The pump source still generates laser light. For example, a failure of the MOS tube in the pump source driver board causes a leakage current in the pump source, and the leakage current will cause the pump source to generate laser light.

In other embodiments, the light emission control information may include a variety of control signals for controlling the working state of the pump source. The control signals include Control signals, EN enable signals, 0-10V power setting signals, and PWM modulation. Signal and so on. When the Control signal, the EN enable signal, the 0-10V power setting signal, and the PWM modulation signal all meet the light-emitting conditions, that is, when the light-emitting control information is the driving information for driving the pump source to work, then the pump source is The laser light can be generated by stating the light control information.

In the same way, when any one or more of the Control signal, EN enable signal, 0-10V power setting signal, and PWM modulation signal does not meet the light-emitting condition, that is, the light-emitting control information is to stop the pumping source from working. Therefore, the pump source can stop generating laser light or stop working according to the light emission control information.

Therefore, under the premise that the working state of the pump source is known to be the laser output state, and the detection signal meets the preset protection condition (for example, the detection signal is low level), when the light emission control information is sufficient to indicate that the pump source is working in the corresponding state When downloading, when the hardware or the light path fails, it is out of the control of the light emission control information. Since the light emission control information is related to the faulty component, the light emission control information can be obtained and the malfunctioning component can be derived from the light emission control information.

For example, the light emission control information includes light emission information or non-light emission information, the faulty component information includes hardware failure information or light path failure information, and when the light emission control information belongs to the light emission information, the faulty component information is determined It is the light path fault information. That is, when the light output control information is driving information for driving the pump source to work, the pump source generates laser light according to the light output control information, but the laser generates protection information, and it can be inferred that the laser light generated by the pump source is in the optical fiber. Abnormal transmission occurs, such as fiber burning, fiber breaking, etc. At this time, the laser cannot be normally transmitted to the position of the PD detector in the fiber, so that the PD detector cannot detect the optical signal and output a low-level detection signal, thus The faulty component information is determined to be the optical path fault information, and the faulty component information is generated.

When the light emission control information belongs to the non-light emission information, it is determined that the faulty component information is hardware fault information. That is, when the light emission control information is work information for stopping the operation of the pump source, the pump source stops generating laser light according to the light emission control information, but the laser generates protection information. That is to say, the pump source is still working in the laser output state without receiving the driving information, so that the protection program of the laser is triggered and the protection information is generated, which can be inferred that the hardware is faulty. Among them, the hardware failure information is the failure information of the pump source drive circuit and its related electronic components. For example, the failure of the MOS tube (field effect tube) in the pump source drive board causes the pump source to have leakage current, which prompts the pump source The laser is generated, so that it can be determined that the faulty component information is hardware fault information, and the faulty component information is generated according to the hardware fault information.

In this embodiment, the faulty component is judged in combination with the light emission control information used to control the pump source to generate laser light to generate faulty component information, which realizes the intelligent location of the faulty component and improves the accuracy of locating the faulty component.

In other embodiments, when the light emission control information is the light emission information, please refer to FIG. 5. FIG. 5 is a flowchart of a fiber laser provided by an embodiment of the application. As shown in FIG. 5, The method also includes the following steps:

Step 51: Obtain the detection signal of the optical path system at all levels;

Step 52: Generate fault location information according to the detection signals of the optical path systems at all levels.

In this embodiment, the fiber laser includes at least one level of optical path system, each level of optical path system includes a pump source and an optical fiber, and each level of fiber is equipped with a PD detector to accurately reflect each level of optical path system The failure situation. When the light emission control information is the light emission information, the pump source generates laser light according to the light emission control information. During the transmission of the laser light through the optical path system, multiple stages of PD detectors may be triggered to generate protection information. The level information of the PD detector of the protection information generates the fault location information.

Specifically, when the light output control information of the pump source of the optical path system at all levels is driving information, that is, when the pump source of the optical path system at each level is in the working laser output state, the detection signal of the optical path system at each level is acquired. If the detection signal of any level or above meets the preset protection condition (the detection signal is a low-level signal), it can be inferred that the laser transmission in the optical fiber of that level is abnormal. The fault location information is generated according to the detection signals of the optical path system at all levels, so that the operator can quickly locate the fault location based on the fault location information.

In order to further explain the specific method of locating the fault location, the fiber laser with a two-stage optical path system is taken as an example for description. It is understandable that this example is only a preferred embodiment provided by this application, and this application can also It is composed of light path systems of other levels, and is not limited to the light path systems described in the following embodiments.

Please refer to FIG. 6. FIG. 6 is a schematic diagram of a two-stage optical path of a fiber laser according to an embodiment of the application. As shown in FIG. 6, the fiber laser 60 is composed of a two-stage optical system. Detect the signal and generate fault location information of the fiber laser. Wherein, the two-level optical path system includes a first-level optical path system and a second-level optical path system. The first-level optical path system and the second-level optical path system each include a pump source and an optical fiber, and each level of optical fiber includes a pump source and an optical fiber. A PD detector is provided. The first-level optical path system includes, but is not limited to, a first-level pump source 601 and a first-level PD detector 602, and the second-level optical path system includes, but is not limited to, a second-level pump source 603 and a second-level PD detector 604.

Specifically, when the first-stage pump source 601 and the second-stage pump source 603 are both working in the laser output state, and there is no abnormality in the optical fiber of the two-stage optical system, the laser output from the first-stage pump source 601 will follow The first-level optical fiber is transmitted to the second-level optical path system and output by the laser head; the laser output from the second-level pump source 603 will be combined with the laser output from the first-level pump source 601 to be output by the laser head. Both the PD detector 602 and the secondary PD detector 604 can detect the optical signal and output a high-level signal.

If an abnormal condition occurs in the optical fiber of any one-stage or two-stage optical system, and the pump source of the two-stage optical system is working in the laser output state, the fault location information generated includes the following situations:

When the detection signal of the first-level optical path system meets the preset protection condition, and the detection signal of the second-level optical path system does not meet the preset protection condition, the first type of fault information is generated. Specifically, both the primary pump source 601 and the secondary pump source 603 work in the laser output state, if the detection signal of the primary PD detector 602 is a low-level signal, and the detection signal of the secondary PD detector 604 is High-level signal, it can be seen that the transmission of laser signals is not detected in the first-level fiber, and the transmission of laser signals is detected in the second-level fiber. Because the first-level fiber interrupts the transmission of laser signals, the transmission of laser signals is interrupted by the first-level fiber. The laser signal detected by the second-level fiber is output by the second-level pump source 603. From this, it can be inferred that the first-level fiber is abnormal, and the first type of fault information is generated according to the abnormality of the first-level fiber to inform the operator The location information of the failed fiber is the first-level fiber.

When the detection signal of the first-level optical path system does not meet the preset protection condition, and the detection signal of the second-level optical path system meets the preset protection condition, the second type of fault information is generated. Specifically, both the primary pump source 601 and the secondary pump source 603 work in the laser output state, if the detection signal of the primary PD detector 602 is a high level signal, and the detection signal of the secondary PD detector 604 is Low-level signal, it can be seen that the laser signal output by the first-level pump source 601 is detected in the first-level fiber, but the first-level pump source 601 or/and the second-level pump is not detected in the second-level fiber From the laser signal output by the source 603, it can be inferred that the second-level fiber is abnormal, and the second-level fault information is generated according to the abnormality of the second-level fiber to inform the operator that the location information of the fiber that has failed is the second-level optical fiber.

When the respective detection signals of the first-level optical path system and the second-level optical path system meet the preset protection conditions, a third type of fault information is generated. Specifically, the primary pump source 601 and the secondary pump source 603 both work in the laser output state. If the detection signals of the primary PD detector 602 and the secondary PD detector 604 are both low-level signals, it can be seen that The laser signal output by the first-stage pump source 601 is not detected in the first-stage fiber, and the laser signal output by the first-stage pump source 601 or/and the second-stage pump source 603 is also not detected in the second-stage fiber From this, it can be inferred that the first-level fiber is abnormal, and the third type of fault information is generated according to the abnormality of the first-level fiber to inform the operator that the location information of the failed fiber is the first-level fiber.

In other embodiments, the above-mentioned fiber laser protection method is adopted, and only when the pump source has a current passing through and reaches a certain value, the PD feedback signal is detected to determine whether the fiber is burned, etc., so as to avoid false alarms.

In some other embodiments, the above-mentioned fiber laser protection method is adopted, and the protection method can also effectively detect and execute the alarm protection action against accidental light emission caused by external interference or device failure.

In other embodiments, using the above-mentioned fiber laser protection method, protection information can be generated in less than 50 μs, and the faulty component can be located according to the protection information and corresponding protection processing can be performed, for example, turning off the power supply to make the pump source Work in the state of not outputting the laser; or, notify the relevant staff through protection signals such as signal indicators, buzzers, and vibration signals for processing. Thereby reducing damage and avoiding greater safety hazards.

The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in One place, or it can be distributed to multiple network units. Some or all of the modules can be selected according to actual needs to achieve the objectives of the solutions of the embodiments.

Through the description of the above implementation manners, those of ordinary skill in the art can clearly understand that each implementation manner can be implemented by means of software plus a general hardware platform, and of course, it can also be implemented by hardware. A person of ordinary skill in the art can understand that all or part of the processes in the methods of the foregoing embodiments can be implemented by instructing relevant hardware through a computer program. The program can be stored in a computer readable storage medium, and the program can be stored in a computer readable storage medium. When executed, it may include the procedures of the above-mentioned method embodiments. Wherein, the storage medium may be Flash, EEPROM, magnetic disk, optical disk, read-only memory (Read-Only Memory, ROM) or random access memory (Random Access Memory, RAM), etc.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, not to limit them; under the idea of this application, the above embodiments or the technical features in different embodiments can also be combined. The steps can be implemented in any order, and there are many other variations in different aspects of the application as described above. For the sake of brevity, they are not provided in the details; although the application is described in detail with reference to the foregoing embodiments, the general The technical personnel should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or equivalently replace some of the technical features; and these modifications or substitutions do not make the essence of the corresponding technical solutions deviate from the implementations of this application Examples of the scope of technical solutions.

Claims (14)

1. A method for protecting a fiber laser, the fiber laser includes at least one level of optical path system, and each level of the optical path system includes at least one pump source and an optical fiber, characterized in that the method includes:

   Determining the working state of the pump source;

   When the working state of the pump source is the laser output state, acquiring a detection signal, where the detection signal is used to indicate the transmission state of the laser in the optical fiber;

   When the detection signal meets a preset protection condition, protection information is generated.
2. The method according to claim 1, wherein the working state comprises the laser output state or the laser non-output state;

   When the current signal flowing through the pump source is acquired, determining that the working state of the pump source is the laser output state;

   When the current signal flowing through the pump source is not obtained, it is determined that the working state of the pump source is the laser non-output state, wherein the current signal is used to drive the pump source to output laser light.
3. The method according to claim 2, wherein the determining the working state of the pump source as the laser output state comprises:

   Judging whether the current signal is greater than or equal to a preset current threshold;

   If yes, select the working state of the pump source as the laser output state;

   If not, select the working state of the pump source as the laser not output state.
4. The method according to claim 3, wherein the selecting the working state of the pump source as the laser output state comprises:

   Pre-set current flag bit;

   According to the current signal and the preset current threshold, the current flag bit is updated, wherein the current flag bit can be replaced with a first flag value or a second flag value, and the first flag value is used to indicate the The current signal is greater than or equal to the preset current threshold, and the second flag value is used to indicate that the current signal is less than the preset current threshold;

   When the flag value of the current flag bit is the first flag value, selecting the working state of the pump source as the laser output state;

   When the flag value of the current flag bit is the second flag value, the working state of the pump source is selected as the laser non-output state.
5. The method according to any one of claims 2 to 4, wherein the current signal is obtained by setting a sampling resistor connected in series with the pump source.
6. The method according to any one of claims 1 to 4, characterized in that,

   The optical path system of each stage of the fiber laser further includes at least one photodiode detector, and the detection signal is converted and output by the photodiode detector.
7. The method according to any one of claims 1 to 4, wherein the generating protection information when the detection signal meets a preset protection condition comprises:

   When the level type of the detection signal is a preset level type, generating protection information;

   When the level type of the detection signal is not a preset level type, the loop detection state is entered.
8. The method according to claim 7, wherein said generating protection information when the level type of the detection signal is a preset level type comprises:

   Determine whether the level type of the detection signal within the preset time period is a preset level type;

   If yes, generate protection information.
9. The method according to any one of claims 1 to 4, wherein the protection information includes faulty component information, and the generating of the protection information includes:

   Acquiring light emission control information, where the light emission control information is used to control the pump source to generate laser light;

   According to the light emission control information, the faulty component information is generated.
10. The method according to claim 9, wherein the light emission control information includes multiple control signals used to control the working state of the pump source, and the control signals include a Control signal, an EN enable signal, and a control signal. ～10V power setting signal, PWM modulation signal.
11. The method according to claim 9, wherein the light emission control information includes light emission information or non-light emission information, the faulty component information includes hardware failure information or light path failure information, and the generating according to the light emission control information The faulty component information includes:

    When the light emission control information belongs to the light emission information, determining that the faulty component information is light path fault information;

    When the light emission control information belongs to the non-light emission information, it is determined that the faulty component information is hardware fault information.
12. The method according to claim 11, wherein when the light emission control information is the light emission information, the method further comprises:

    Obtain the detection signals of the optical system at all levels;

    According to the detection signals of the optical path systems at all levels, fault location information is generated.
13. The method according to claim 12, wherein the fiber laser is composed of a two-level optical path system, and the generating fault location information according to the detection signal of the optical path system at each level includes:

    When the detection signal of the first-level optical path system meets the preset protection conditions, and the detection signal of the second-level optical path system does not meet the preset protection conditions, the first type of fault information is generated;

    When the detection signal of the first-level optical path system does not meet the preset protection condition, and the detection signal of the second-level optical path system meets the preset protection condition, generating the second type of fault information;

    When the respective detection signals of the first-level optical path system and the second-level optical path system meet the preset protection conditions, a third type of fault information is generated.
14. A fiber laser, characterized in that it comprises:

    At least one-level optical path system, including one or more pump sources and optical fibers, the pump sources are used to output laser light, and the laser light can be transmitted in the optical fiber;

    A driving circuit for driving the optical path system to work; and,

    The control circuit is respectively connected with the optical path system and the drive circuit, wherein the control circuit includes:

    At least one processor, respectively connected to the optical path system and the drive circuit; and,

    A memory that is communicatively connected to the at least one processor; wherein the memory stores an instruction program executable by the at least one processor, and the instruction program is executed by the at least one processor so that the at least one The processor executes the fiber laser protection method according to any one of claims 1-13.

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