Fiber laser alarm device and method

Abstract

The invention provides an optical fiber laser alarm device and method, and the device comprises early warning modules and an optical fiber cooling plate, the early warning modules and the optical fiber cooling plate are disposed in the same packaging housing, each early warning module comprises a mounting support, a light sensing module and a circuit board, the mounting supports are disposed on the optical fiber cooling plate, and the light sensing module is disposed on the circuit board. The optical fiber cooling plate is used for coiling and accommodating laser optical fibers; the circuit board is arranged on the mounting bracket, and the light sensation module is arranged on the circuit board and serves as a light sensation detector of an acquisition circuit on the circuit board; the light sensing module is used for detecting scattered light of fused optical fibers on the optical fiber cooling plate, and the circuit board is used for converting optical signals detected by the light sensing module into voltage signals and judging whether fusing early warning needs to be carried out or not according to the voltage signals; the early warning module is directly arranged in the packaging shell, so that visible light in the packaging shell is directly monitored, and early warning of optical fiber fusing is more timely and more accurate.

Description

Technical Field

[0001] This invention relates to the field of optical communication technology, and in particular to an alarm device and method for fiber lasers. Background Technology

[0002] When the optical fiber of a fiber laser experiences abnormal output power or poor heat dissipation, its temperature can rise. If left uncontrolled, this can lead to fiber fusion and burnout. Therefore, it is necessary to monitor and warn of fiber fusion outside the laser, and to shut down the laser before fiber fusion is detected. A common practice in the current technology is to select a point on the fiber, strip the cladding at that point, and monitor the optical power of the scattered light at that point using a photodetector. Since the output power gradually decreases over a period of time after fiber fusion, if the difference between the monitored output power and the preset value exceeds a certain threshold, an abnormal output is detected, and the laser output is shut down to prevent the laser fiber from burning out.

[0003] However, the problem lies in the fact that, in practical applications, when an optical fiber breaks, it often takes a certain amount of time for the output power to drop to the set threshold. By the time the output power is detected to be below the set threshold, the optical fiber has usually already broken or even burned out. Therefore, this monitoring method has a poor response speed and low reliability. On the other hand, as the service life of a fiber laser increases, its output power will naturally decrease. When the service life is too long, the output power will naturally decrease, and the difference between the detected real-time output power value and the preset value will increase, which will also trigger an alarm. At this time, even if no fiber breakage has occurred, there is a possibility of false alarm triggering and causing the fiber laser to be shut down.

[0004] Therefore, overcoming the shortcomings of the existing technology is an urgent problem to be solved in this technical field. Summary of the Invention

[0005] The technical problem to be solved by this invention is how to improve the response speed and accuracy of monitoring fiber optic fracture in fiber lasers.

[0006] The present invention adopts the following technical solutions: In a first aspect, a fiber laser alarm device is provided, comprising: at least one warning module 1, a fiber optic cooling plate 2, and a packaging shell, wherein: Both the at least one early warning module 1 and the fiber optic cooling plate 2 are located inside the encapsulation shell; Each of the early warning modules 1 includes a mounting bracket 11, a light sensing module 12, and a circuit board 13. The mounting bracket 11 is disposed on the optical fiber cooling plate 2, and the optical fiber cooling plate 2 is used to coil and store the laser optical fiber. The circuit board 13 is disposed on the mounting bracket 11, and the photosensitive module 12 is disposed on the circuit board 13 and serves as a photosensitive detector for the acquisition circuit on the circuit board 13. The optical sensing module 12 is used to detect the visible light of the optical fiber that has been melted on the optical fiber cooling plate 2. The circuit board 13 is used to convert the visible light signal detected by the optical sensing module 12 into a voltage signal, and to determine whether a meltdown warning is needed based on the voltage signal.

[0007] Preferably, the acquisition circuit on the circuit board 13 specifically includes: a detection circuit 131, an amplification circuit 132, a comparison circuit 133, and an alarm module 134, wherein: The detection circuit 131 is connected to the amplification circuit 132, the amplification circuit 132 is connected to the comparison circuit 133, the comparison circuit 133 is connected to the alarm module 134, and the detection circuit 131 includes the light sensing module 12, wherein the light sensing module 12 is used to convert the received light signal into a photocurrent. The detection circuit 131 is used to convert the induced photocurrent into a voltage signal, the amplification circuit 132 is used to amplify the voltage signal, the comparison circuit 133 is used to compare the amplified voltage signal with a preset voltage threshold, and the alarm module 134 is used to issue a fuse failure warning when the amplified voltage signal is greater than the preset voltage threshold.

[0008] Preferably, the light-sensing module 12 is a photosensitive sensor Q1, and the detection circuit 131 further includes: a resistor R1, an adjustable resistor R4, a filter capacitor C1, and a resistor R2, wherein: The bias voltage VCC is connected to one end of the resistor R1, the other end of the resistor R1 is connected to the collector of the photosensitive sensor Q1, the emitter of the photosensitive sensor Q1 is connected to one end of the adjustable resistor R4, and the other end of the adjustable resistor R4 is grounded. One end of the resistor R2 is connected to the emitter of the photosensitive sensor Q1, and the other end of the resistor R2 is connected to the amplifier circuit 132; one end of the filter capacitor C1 is connected to one end of the resistor R2, and the other end of the filter capacitor C1 is grounded.

[0009] Preferably, the amplifier circuit 132 includes: a voltage comparator U1A, a resistor R6, and a resistor R7, wherein: The other end of resistor R2 is connected to the positive input terminal of voltage comparator U1A. One end of resistor R6 is grounded, and the other end of resistor R6 is connected to the negative input terminal of voltage comparator U1A. One end of resistor R7 is connected to the negative input terminal of voltage comparator U1A, and the other end of resistor R7 is connected to the output terminal of voltage comparator U1A. The output terminal of voltage comparator U1A is connected to the comparison circuit 133.

[0010] Preferably, the expression for the voltage signal is: ; The expression for the amplified voltage signal is: ; in, The induced photocurrent, It is a voltage signal. This is the amplified voltage signal.

[0011] Preferably, the comparison circuit 133 includes: resistor R3, voltage comparator U1B, resistor R5, and diode D1, wherein: One end of resistor R3 is connected to the output terminal of voltage comparator U1A and resistor R7 respectively. The other end of resistor R3 is connected to the positive input terminal of voltage comparator U1B. One end of resistor R5 is connected to the threshold voltage Verf. The other end of resistor R5 is connected to the negative input terminal of voltage comparator U1B. The output terminal of voltage comparator U1B is connected to diode D1. Diode D1 is connected to alarm module 134.

[0012] Preferably, the mounting bracket 11 includes: a base 111 and a panel 112, wherein: The base 111 is mounted on the fiber optic cooling plate 2, and the panel 112 is mounted on the base 111, with the panel 112 and the base 111 forming an angle of 60±10 degrees; the circuit board 13 is mounted on the panel 112.

[0013] Preferably, the optical fiber cooling plate 2 is provided with at least two early warning modules 1, and the two early warning modules 1 are respectively located at two opposite corners of the optical fiber cooling plate 2.

[0014] Secondly, a fiber laser alarm method is provided, applied to the fiber laser alarm device, comprising: The photosensitive module 12 detects visible light inside the package shell and converts the received light signal into an induced photocurrent. The circuit board 13 converts the induced photocurrent into a voltage signal. The voltage signal is used to determine whether there is a broken optical fiber on the optical fiber cooling plate 2, so as to provide a blowout warning.

[0015] Preferably, the fiber laser alarm method further includes determining the adjustable range of the adjustable resistor R4, specifically including: Adjust the adjustable resistor R4 in the detection circuit 131 in the circuit board 13 to obtain the first critical value of the adjustable resistor R4. When the adjustable resistor R4 is adjusted to be greater than or equal to the first critical value and the optical fiber on the optical fiber cooling plate 2 is not melted, the warning module 1 will not issue a meltdown warning due to interference with the optical signal. Adjust the adjustable resistor R4 in the detection circuit 131 in the circuit board 13 to obtain the second critical value of the adjustable resistor R4. When the adjustable resistor R4 is adjusted to be less than or equal to the second critical value and the optical fiber on the optical fiber cooling plate 2 is broken, the early warning module 1 issues a breakage warning due to the visible light emitted by the broken optical fiber. The adjustable resistor R4 is set within a range that is greater than or equal to the first critical value and less than or equal to the second critical value.

[0016] This invention provides an alarm device and method for a fiber laser, comprising: an early warning module 1 and a fiber cooling plate 2, wherein the early warning module 1 and the fiber cooling plate 2 are disposed within the same encapsulated housing, wherein: each of the early warning modules 1 includes a mounting bracket 11, a photosensitive module 12, and a circuit board 13; the mounting bracket 11 is disposed on the fiber cooling plate 2, which is used for coiling and storing laser fibers; the circuit board 13 is disposed on the mounting bracket 11, and the photosensitive module 12 is disposed on the circuit board 13, serving as a photodetector for the acquisition circuit on the circuit board 13; the photosensitive module 12 is used to detect the scattered light from a broken fiber on the fiber cooling plate 2, and the circuit board 13 is used to convert the light signal detected by the photosensitive module 12 into a voltage signal, and determine whether a breakage warning is required based on the voltage signal; by directly placing the early warning module 1 inside the encapsulated housing, the visible light inside the encapsulated housing can be directly monitored, making the fiber breakage warning more timely and accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] To more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. Those skilled in the art can also derive other drawings based on these drawings without inventive effort.

[0018] Figure 1This is a schematic diagram of the structure of a fiber laser alarm device provided in an embodiment of the present invention; Figure 2 This is an exploded view from the side of a fiber laser alarm device provided in an embodiment of the present invention; Figure 3 This is a schematic diagram of the structure of the early warning module in a fiber laser alarm device provided in an embodiment of the present invention; Figure 4 This is the spectral response curve of the photosensitive module in a fiber laser alarm device provided in an embodiment of the present invention; Figure 5 This is a circuit diagram of the acquisition circuit in a fiber laser alarm device provided in an embodiment of the present invention; Figure 6 This is a side view of the early warning module in a fiber laser alarm device provided in an embodiment of the present invention; Figure 7 This is a circuit diagram of the acquisition circuit in another fiber laser alarm device provided in an embodiment of the present invention; Figure 8 This is a flowchart of a fiber laser alarm method provided in an embodiment of the present invention; Figure 9 This is a flowchart of the method for setting the adjustable resistor R4 in a fiber laser alarm method provided in an embodiment of the present invention; The attached figures are numbered as follows: Early warning module 1; mounting bracket 11; base 111; panel 112; light sensor module 12; circuit board 13; detection circuit 131; amplifier circuit 132; comparison circuit 133; alarm module 134; fiber optic cooling plate 2. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0020] In the description of this invention, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this disclosure.

[0021] In the description of the present invention, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present disclosure, unless otherwise specified, "multiple" means two or more. In addition, for example, the description may also use the method of adding "A" and "B" at the end to describe the same type of nouns as two independent individuals. In this case, the corresponding features defined as "A" and "B" are only used to distinguish the description purposes of the same type of individuals, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated.

[0022] As used in this invention, “about,” “approximately,” or “approximately” includes the stated value and the average value within an acceptable range of deviation from a particular value, wherein the acceptable range of deviation is determined by a person skilled in the art taking into account the measurement under discussion and the error associated with the measurement of the particular quantity, i.e., the limitations of the measurement system.

[0023] Unless the context requires otherwise, throughout the specification and claims, the term "including" is to be interpreted as meaning open inclusion, that is, "including, but not limited to". In the description of the specification, the terms "one embodiment", "some embodiments", "exemplary embodiments", "example", "specific example" or "some examples" and the like are intended to indicate that the specific features, structures, materials or characteristics associated with the embodiment or example are included in at least one embodiment or example of the present disclosure. The schematic representation of the above terms does not necessarily refer to the same embodiment or example. In addition, the specific features, structures, materials or characteristics may be included in any one or more embodiments or examples in any appropriate manner, that is, although they may be carried in the embodiments or examples of the above terms due to reasons such as the order and position of appearance, it is not limited to that they can be carried in combination by one embodiment or example.

[0024] Furthermore, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0025] Embodiment 1: Embodiment 1 of the present invention provides a fiber laser alarm device, such as... Figure 1 and Figure 2 As shown, it includes: at least one early warning module 1, an optical fiber cooling plate 2, and a packaging shell, wherein: The at least one early warning module 1 and the fiber optic cooling plate 2 are both located inside the encapsulation housing. Each early warning module 1 includes a mounting bracket 11, a photosensitive module 12, and a circuit board 13. The mounting bracket 11 is disposed on the fiber optic cooling plate 2, which is used to coil and store laser fibers. The circuit board 13 is disposed on the mounting bracket 11, and the photosensitive module 12 is disposed on the circuit board 13, serving as a photosensitive detector for the acquisition circuit on the circuit board 13. The photosensitive module 12 is used to detect the visible light emitted by the fiber optic cooling plate 2 that has fused. The circuit board 13 is used to convert the visible light signal detected by the photosensitive module 12 into a voltage signal, and to determine whether a fusion warning is required based on the voltage signal.

[0026] In this embodiment, the encapsulation shell is used to house the early warning module 1 and the fiber optic cooling plate 2, and to isolate the early warning module 1 and the fiber optic cooling plate 2 from the outside world. External light cannot enter the encapsulation shell, and there is basically no light inside the encapsulation shell unless the fiber optic cable is broken. Therefore, by placing the early warning module 1 on the fiber optic cooling plate 2 and near the fiber optic cable, within the same encapsulation shell, the early warning module 1 can monitor the fiber optic cable on the fiber optic cooling plate 2 in real time. When the fiber optic cable breaks, the broken point will directly emit visible light. The early warning module 1, located within the same encapsulation shell as the fiber optic cable, can directly detect the visible light, thereby issuing a breakage warning. When a breakage warning is issued, the laser is turned off to prevent the cable from breaking or further deterioration.

[0027] In this embodiment, the fiber cooling plate 2 is equipped with one or more sets of fiber coiling tracks for coiling and storing the laser's optical fibers. When the optical power of these fibers is abnormal or the heat dissipation conditions are poor, the fiber temperature will gradually rise. If timely control and warning are not implemented, the fiber will melt or even burn out. The warning module 1 is used to detect the visible light emitted from the melted location when the fiber melts. Based on the detected visible light, an induced photocurrent is generated. The induced photocurrent is proportional to the intensity of the detected visible light. The induced photocurrent is converted into a voltage signal, and the voltage signal is used to determine whether a meltdown warning is needed.

[0028] Furthermore, such as Figure 1-Figure 3 As shown, the mounting bracket 11 is disposed on the fiber optic cooling plate 2 and is used to connect the photosensitive module 12 and the circuit board 13 to the fiber optic cooling plate 2. The mounting bracket 11 can be fixedly connected to the fiber optic cooling plate 2 by screws and screw holes. The photosensitive module 12 is a photosensitive sensor that detects and receives visible light inside the packaged housing.

[0029] Furthermore, besides the visible light generated when the optical fiber breaks, there are usually other interfering optical signals in other wavelengths inside the encapsulation shell. These interfering optical signals may also be received by the photosensitive module 12, leading to false alarms in the fiber breakage warning. The wavelength range of the visible light generated when the optical fiber breaks is 390nm-780nm, while the wavelength of the interfering optical signals can be 976nm or 1064nm, etc. Therefore, in this embodiment, a photosensitive module 12 with a sensing wavelength range of 390nm-780nm can be selected, so that the photosensitive module 12 will only detect visible light in the 390nm-780nm wavelength range, such as... Figure 4 As shown, the spectral response curve of the photosensitive module 12 is as follows: when the wavelength of the optical signal is outside the 390nm-780nm range, the photosensitive module 12 will basically not respond to the optical signal in that wavelength range. At the same time, the center wavelength of 520nm in the 390nm-780nm range has the highest response sensitivity, ensuring that the photosensitive module 12 will basically only detect the visible light generated by the fiber optic cable breakage, and other interfering optical signals will basically not be detected, thus ensuring the accuracy of the detection of the warning module 1 and meeting the detection requirements of visible light.

[0030] The circuit board 13 is used to form an early warning circuit, which converts the visible light detected by the light sensing module 12 into a photocurrent, and then converts the photocurrent into a voltage signal. The intensity of the visible light is determined based on the intensity of the voltage signal, thereby determining whether a fuse warning needs to be issued.

[0031] In this embodiment, by placing the photosensitive module 12 inside the encapsulation shell, the visible light inside is directly detected, improving the detection response speed. Since the visible light is directly monitored, the detection response speed is not slow due to the delay in optical power. Furthermore, since the intensity of visible light inside the encapsulation shell does not decrease due to the age of the laser, false alarms caused by the age of the laser are avoided. On the other hand, since the photosensitive module 12 can select a specified detection band, it can avoid being affected by interference light signals inside the encapsulation shell, ensuring the accuracy of the detection by the warning module 1 and meeting the detection requirements of visible light.

[0032] Furthermore, in this embodiment, in order to realize the detection and early warning of visible light by the circuit board 13, the acquisition circuit corresponding to the circuit board 13 involves the following design: like Figure 5As shown, the acquisition circuit on the circuit board 13 specifically includes: a detection circuit 131, an amplification circuit 132, a comparison circuit 133, and an alarm module 134. The detection circuit 131 is connected to the amplification circuit 132, the amplification circuit 132 is connected to the comparison circuit 133, and the comparison circuit 133 is connected to the alarm module 134. The detection circuit 131 includes a photosensitive module 12, which converts the received light signal into a sensed photocurrent. The detection circuit 131 converts the sensed photocurrent into a voltage signal. The amplification circuit 132 amplifies the voltage signal. The comparison circuit 133 compares the amplified voltage signal with a preset voltage threshold. The alarm module 134 issues a fuse warning when the amplified voltage signal exceeds the preset voltage threshold. In this embodiment, the preset voltage threshold is set by those skilled in the art based on actual conditions.

[0033] like Figure 5 As shown, the photosensitive module 12 is a photosensitive sensor Q1. The detection circuit 131 further includes: a resistor R1, an adjustable resistor R4, a filter capacitor C1, and a resistor R2, wherein: the bias voltage VCC is connected to one end of the resistor R1, the other end of the resistor R1 is connected to the collector of the photosensitive sensor Q1, the emitter of the photosensitive sensor Q1 is connected to one end of the adjustable resistor R4, and the other end of the adjustable resistor R4 is grounded; one end of the resistor R2 is connected to the emitter of the photosensitive sensor Q1, and the other end of the resistor R2 is connected to the amplifier circuit 132; one end of the filter capacitor C1 is connected to one end of the resistor R2, and the other end of the filter capacitor C1 is grounded.

[0034] When visible light shines on the photosensitive surface of the photosensitive module 12, an induced photocurrent is generated between the bias voltage VCC and the photosensitive module 12. , A current flows through the adjustable resistor R4, resulting in a voltage signal SIG1A. The magnitude of the voltage signal SIG1A is positively correlated with the intensity of visible light illumination; that is, the stronger the visible light illumination, the better. The larger the value, ideally the larger the voltage signal SIG1A. The relationship with resistor R4 is as follows: ; in, The resistor R1 is used to divide the voltage to control the maximum value of the voltage signal SIG1A, which is the induced photocurrent. When the visible light intensity is weak, the voltage signal SIG1A is also very weak, especially in the absence of visible light. Ideally, However, in reality, the photosensitive module 12 has a dark current, meaning that in the absence of visible light, there is a leakage current of approximately 0.2µA between the photosensitive module 12 and the bias voltage VCC. This leakage current generates a corresponding voltage signal across the adjustable resistor R4. Simultaneously, interference current exists in the circuit and is also superimposed on the voltage signal SIG1A. This constitutes interference noise, which can affect subsequent fuse warnings. Therefore, it is necessary to filter out the interference noise. Thus, a filter capacitor C1 is included in the circuit to filter out unwanted interference noise. In this embodiment, the adjustable resistor R4 can be adjusted using a mechanical potentiometer or a digital potentiometer.

[0035] like Figure 5 As shown, the amplifier circuit 132 includes: a voltage comparator U1A, resistor R6, and resistor R7, wherein: The other end of resistor R2 is connected to the positive input terminal of voltage comparator U1A. One end of resistor R6 is grounded, and the other end of resistor R6 is connected to the negative input terminal of voltage comparator U1A. One end of resistor R7 is connected to the negative input terminal of voltage comparator U1A, and the other end of resistor R7 is connected to the output terminal of voltage comparator U1A. The output terminal of voltage comparator U1A is connected to the comparison circuit 133.

[0036] The output of the voltage comparator U1A is the amplified voltage signal. The amplified voltage signal The expression is: ; in, It is a voltage signal. This is the amplified voltage signal.

[0037] It is worth mentioning that, in this embodiment, the value of the adjustable resistor R4 needs to ensure that: a warning is issued for the voltage signal generated by visible light when the optical fiber is broken, and a warning is not issued for the voltage signal generated by the interference light signal detected by the photosensitive module 12. The "interference light signal detected by the photosensitive module 12" refers to the light signal with a wavelength in the range of 390nm-780nm that is not generated by the optical fiber being broken. Since the intensity of the interference light signal is much smaller than the intensity of the visible light when the optical fiber is broken, the voltage signal obtained by the adjustable resistor R4 from the interference light signal cannot trigger the breakage warning, while the voltage signal obtained by the visible light when the optical fiber is broken can trigger the breakage warning.

[0038] In this embodiment, the adjustable resistor R4 is used to be compatible with different types of lasers. Since the interference light signals generated in different types of lasers are different, and the intensity of the visible light generated when the fuse is broken is also different, the circuit board 13 on the warning module 1 needs to ensure that the warning module 1 can cope with different types of lasers by adjusting the adjustable resistor R4.

[0039] Furthermore, such as Figure 5 As shown, the comparison circuit 133 includes: resistor R3, voltage comparator U1B, resistor R5, and diode D1, wherein: one end of resistor R3 is connected to the output terminal of voltage comparator U1A and resistor R7 respectively, the other end of resistor R3 is connected to the positive input terminal of voltage comparator U1B, one end of resistor R5 is connected to the threshold voltage Verf, the other end of resistor R5 is connected to the negative input terminal of voltage comparator U1B, the output terminal of voltage comparator U1B is connected to diode D1, and diode D1 is connected to alarm module 134.

[0040] In this embodiment, the voltage value of the threshold voltage Verf The settings shall be made by those skilled in the art based on the actual situation, when Greater than When the voltage comparator U1B outputs a high level, it triggers the alarm module 134 to issue a fuse warning. Less than or equal to When the voltage comparator U1B outputs a low level, the alarm module 134 will not be triggered. In this embodiment, the threshold voltage Verf can be set by a voltage reference chip or a microcontroller, and the reference voltage can be adjusted by software decoding or set online.

[0041] Furthermore, in this embodiment, in order to improve the detection effect of the early warning module 1 and the efficiency of the light sensor module 12 in receiving light signals, it is necessary to adjust the orientation and position of the light sensor module 12. Therefore, this embodiment also involves the following design: Figure 6 As shown, the mounting bracket 11 includes a base 111 and a panel 112, wherein: the base 111 is disposed on the fiber optic cooling plate 2, the panel 112 is disposed on the base 111, and the panel 112 and the base 111 form an angle of 60±10 degrees; the circuit board 13 is disposed on the panel 112.

[0042] Furthermore, in practical applications, to ensure the effectiveness of the early warning module 1 in detecting visible light inside the package, more early warning modules 1 can be added inside the package as needed. Each module uses the same components and configuration, thereby expanding the detection range of visible light inside the package and increasing the response speed. Therefore, this embodiment also involves the following design: like Figure 1 and Figure 7 As shown, at least two early warning modules 1 are provided on the optical fiber cooling plate 2, and the two early warning modules 1 are respectively located on two opposite corners of the optical fiber cooling plate 2. Figure 7 The upper part of the circuit diagram corresponds to Figure 5 The circuit diagram in the image corresponds to one of the early warning modules, 1. Figure 7 The lower half of the circuit diagram and Figure 5 The circuit structures are the same, the only difference being the change in the position numbers of each component, corresponding to another warning module 1. The two warning modules 1 are connected in an OR configuration.

[0043] In this embodiment, the two warning modules 1 use the same components and have the same working principle; please refer to the description of the warning module 1 above for details. It should be noted that when either warning module 1 needs to issue a fuse-breaking warning, the alarm module 134 will directly issue a fuse-breaking warning.

[0044] Example 2: Embodiment 2 of the present invention provides a fiber laser alarm method for application in the fiber laser alarm device of Embodiment 1, such as... Figure 8 As shown, it includes: In step 101, the visible light inside the package shell is detected by the light sensing module 12 to convert the received light signal into an induced photocurrent.

[0045] In step 102, the induced photocurrent is converted into a voltage signal by the circuit board 13.

[0046] In step 103, the voltage signal is used to determine whether there is a broken optical fiber on the optical fiber cooling plate 2, so as to provide a blowout warning.

[0047] Furthermore, the fiber laser alarm method also includes determining the adjustable range of the resistance value of the adjustable resistor R4, such as... Figure 9 As shown, specifically including: In step 201, the adjustable resistor R4 in the detection circuit 131 of the circuit board 13 is adjusted to obtain the first critical value of the adjustable resistor R4. When the adjustable resistor R4 is adjusted to be greater than or equal to the first critical value and the optical fiber on the optical fiber cooling plate 2 is not melted, the warning module 1 will not issue a meltdown warning due to interference with the optical signal.

[0048] In step 202, the adjustable resistor R4 in the detection circuit 131 of the circuit board 13 is adjusted to obtain the second critical value of the adjustable resistor R4. When the adjustable resistor R4 is adjusted to be less than or equal to the second critical value and the optical fiber on the optical fiber cooling plate 2 is broken, the early warning module 1 issues a breakage warning due to the optical signal emitted by the broken optical fiber.

[0049] The adjustable resistor R4 is set within a range that is greater than or equal to the first critical value and less than or equal to the second critical value.

[0050] In this embodiment, the value of the adjustable resistor R4 needs to ensure that: a warning is issued for the voltage signal generated by visible light when the optical fiber is broken, and a warning is not issued for the voltage signal generated by the interference light signal detected by the photosensitive module 12. The "interference light signal detected by the photosensitive module 12" refers to a light signal with a wavelength in the range of 390nm-780nm that is not generated by the optical fiber being broken. Since the intensity of the interference light signal is much smaller than the intensity of the visible light when the optical fiber is broken, the voltage signal obtained by the interference light signal from the adjustable resistor R4 can be adjusted so that it cannot trigger the breakage warning, while the voltage signal obtained by the visible light when the optical fiber is broken can trigger the breakage warning.

[0051] In this embodiment, the adjustable resistor R4 is used to be compatible with different types of lasers. Since the interference light signals generated in different types of lasers are different, and the intensity of the visible light generated when the fuse is broken is also different, the circuit board 13 on the warning module 1 needs to ensure that the warning module 1 can cope with different types of lasers by adjusting the adjustable resistor R4.

[0052] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A fiber laser alarm device, characterized in that: include: At least one early warning module (1), an optical fiber cooling plate (2) and a packaging shell, wherein: The at least one early warning module (1) and the optical fiber cooling plate (2) are both located inside the packaging shell; Each of the early warning modules (1) comprises a mounting bracket (11), a light sensing module (12) and a circuit board (13); the mounting bracket (11) is arranged on the optical fiber cooling plate (2); the optical fiber cooling plate (2) is used for coiling and storing laser optical fibers; The circuit board (13) is arranged on the mounting bracket (11); the light sensing module (12) is arranged on the circuit board (13) and serves as a light sensing detector of the collection circuit on the circuit board (13); The light sensing module (12) is used to detect visible light of a fused optical fiber on the optical fiber cooling plate (2); the circuit board (13) is used to convert the optical signal of the visible light detected by the light sensing module (12) into a voltage signal, and to determine whether a fuse warning is required based on the voltage signal.

2. The optical fiber laser alarm device according to claim 1, characterized in that: The acquisition circuit on the circuit board (13) specifically comprises: a detection circuit (131), an amplification circuit (132), a comparison circuit (133) and an alarm module (134), wherein: The detection circuit (131) is connected to the amplifier circuit (132), the amplifier circuit (132) is connected to the comparison circuit (133), the comparison circuit (133) is connected to the alarm module (134), the detection circuit (131) comprises the light sensing module (12), wherein the light sensing module (12) is used to convert a received light signal into an induced photocurrent; The detection circuit (131) is used to convert the induced photocurrent into a voltage signal, the amplification circuit (132) is used to amplify the voltage signal, the comparison circuit (133) is used to compare the amplified voltage signal with a preset voltage threshold, and the alarm module (134) is used to issue a fuse warning when the amplified voltage signal is greater than the preset voltage threshold.

3. The optical fiber laser alarm device according to claim 2, characterized in that: The light sensing module (12) is a light sensitive sensor Q1, and the detection circuit (131) further comprises: a resistor R1, an adjustable resistor R4, a filter capacitor C1 and a resistor R2, wherein: The bias voltage VCC is connected to one end of the resistor R1, the other end of the resistor R1 is connected to the collector of the photosensor Q1, the emitter of the photosensor Q1 is connected to one end of the adjustable resistor R4, and the other end of the adjustable resistor R4 is grounded; One end of the resistor R2 is connected to the emitter of the photosensor Q1, and the other end of the resistor R2 is connected to the amplifier circuit (132); one end of the filter capacitor C1 is connected to one end of the resistor R2, and the other end of the filter capacitor C1 is grounded.

4. The optical fiber laser alarm device according to claim 3, characterized in that: The amplifying circuit (132) comprises: a voltage comparator U1A, a resistor R6 and a resistor R7, wherein: The other end of the resistor R2 is connected to the positive input terminal of the voltage comparator U1A, one end of the resistor R6 is grounded, the other end of the resistor R6 is connected to the negative input terminal of the voltage comparator U1A, one end of the resistor R7 is connected to the negative input terminal of the voltage comparator U1A, the other end of the resistor R7 is connected to the output terminal of the voltage comparator U1A, and the output terminal of the voltage comparator U1A is connected to the comparison circuit (133).

5. The optical fiber laser alarm device according to claim 4, characterized in that: The expression of the voltage signal is: ； The expression of the amplified voltage signal is: ； in, is the induced photocurrent, is the voltage signal, is the amplified voltage signal.

6. The optical fiber laser alarm device according to claim 4, characterized in that: The comparison circuit (133) comprises: a resistor R3, a voltage comparator U1B, a resistor R5 and a diode D1, wherein: One end of the resistor R3 is connected to the output end of the voltage comparator U1A and the resistor R7 respectively, the other end of the resistor R3 is connected to the positive input end of the voltage comparator U1B, one end of the resistor R5 is connected to the threshold voltage Verf, the other end of the resistor R5 is connected to the negative input end of the voltage comparator U1B, the output end of the voltage comparator U1B is connected to the diode D1, and the diode D1 is connected to the alarm module (134).

7. The optical fiber laser alarm device according to claim 1, characterized in that: The mounting bracket (11) comprises: a base (111) and a panel (112), wherein: The base (111) is arranged on the optical fiber cooling plate (2), the panel (112) is arranged on the base (111), and an angle of 60±10 degrees is formed between the panel (112) and the base (111); and the circuit board (13) is arranged on the panel (112).

8. The optical fiber laser alarm device according to claim 1, characterized in that: At least two early warning modules (1) are arranged on the optical fiber cooling plate (2), and the two early warning modules (1) are respectively arranged on two opposite end corners of the optical fiber cooling plate (2).

9. A fiber laser alarm method, applied to the fiber laser alarm device as claimed in any one of claims 1 to 8, characterized in that: include: Visible light inside the package shell is detected by the light sensing module (12) to convert the received light signal into an induced photocurrent; Converting the induced photocurrent into a voltage signal via the circuit board (13); It is determined based on the voltage signal whether there is any optical fiber on the optical fiber cooling plate (2) that has been fused, so as to provide a fuse warning.

10. The optical fiber laser alarm method according to claim 9, characterized in that: The optical fiber laser alarm method further includes determining the adjustable resistance range of the adjustable resistor R4, specifically including: Adjusting an adjustable resistor R4 in a detection circuit (131) in the circuit board (13) to obtain a first critical value of the adjustable resistor R4, wherein when the adjustable resistor R4 is adjusted to be greater than or equal to the first critical value and the optical fiber on the optical fiber cooling plate (2) has not been fused, the warning module (1) will not issue a fusion warning due to interference with the optical signal; Adjusting an adjustable resistor R4 in a detection circuit (131) in the circuit board (13) to obtain a second critical value of the adjustable resistor R4, wherein when the adjustable resistor R4 is adjusted to be less than or equal to the second critical value and the optical fiber on the optical fiber cooling plate (2) is blown, the warning module (1) issues a blown warning due to visible light emitted by the optical fiber blown; The adjustable resistor R4 is set within a range that is greater than or equal to the first critical value and less than or equal to the second critical value.

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