Discharge compensation method and system for optical fiber fusion splicer

Abstract

The present invention provides a method and system for discharging compensation of an optical fiber fusion splicer, which is applied to the technical field of fusion splicers. In the discharging process, multiple real-time discharging compensations are performed according to the arc state, and based on the real-time sampled arc image, the arc characteristic value of the current frame arc image is compared with the reference characteristic value of the corresponding standard arc image, and the discharge intensity is adjusted according to the difference between the two to achieve discharging compensation, so that the compensated arc image approaches the standard arc image; the arc characteristic value includes the arc center brightness, the arc boundary brightness and the arc width; the discharging condition includes the discharging stage and the discharging state, the discharging stage includes the initial stage of discharging and the stable period of discharging, and the discharging state includes the too weak state of discharging, the normal state of discharging and the too strong state of discharging. In different stages and different states of the discharging process, the corresponding arc characteristic value is selected to be compared with the corresponding reference characteristic value and the discharging compensation is performed according to the difference, so as to improve the accuracy and stability of the compensation of the whole discharging process.

Description

Technical Field

[0001] The invention belongs to the technical field of fusion splicers, and in particular relates to a discharge compensation method and system for an optical fiber fusion splicer. Background Art

[0002] Fusion splicers generally refer to fiber optic fusion splicers used in the field of optical communications. The working principle is to use a high-voltage arc to melt the two fiber sections while using a high-precision motion mechanism to smoothly push the two fibers into one to achieve coupling of the fiber mode field.

[0003] At present, in the discharge process of the welding machine, discharge compensation is mostly performed through a unique arc characteristic value, that is, the discharge intensity is adjusted by the arc width value in the stable discharge stage. However, in different stages of discharge, the arc state is a changing process. Discharge compensation is performed only through the arc width value, and its compensation effect is not accurate enough, especially when the arc is unstable, its compensation effect is poor. Summary of the invention

[0004] In view of the above problems in the prior art, the purpose of the present invention is to provide a discharge compensation method for a fiber fusion splicer. In different stages and states of the discharge process, corresponding arc characteristic values ​​are selected for comparison with corresponding reference characteristic values ​​and discharge compensation is performed based on the difference, thereby improving the accuracy and stability of compensation for the entire discharge process.

[0005] A method for discharging compensation of an optical fiber fusion splicer is disclosed. In the discharging process of the fusion splicer, multiple real-time discharging compensations are performed according to the arc state. In the discharging compensation process, based on the real-time sampled arc image, the arc characteristic value of the current frame arc image is compared with the reference characteristic value of the corresponding standard arc image. The discharge intensity is adjusted according to the difference between the two to achieve discharging compensation, so that the compensated arc image approaches the standard arc image. The arc characteristic value includes arc center brightness, arc boundary brightness and arc width. The discharging condition includes discharging stage and discharging state. The discharging stage includes discharging initial stage and discharging stable period. The discharging state includes discharging too weak state, discharging normal state and discharging too strong state.

[0006] Preferably, when the welding machine is in the initial stage of discharge, the current discharge state is judged. If the discharge is too weak, the arc center brightness is used as a compensation parameter and compared with the corresponding benchmark characteristic value; if the discharge is too strong, the arc boundary brightness is used as a compensation parameter and compared with the corresponding benchmark characteristic value.

[0007] Preferably, when the welding machine is in the initial stage of discharge, the process of judging the current discharge state is as follows:

[0008] Determine whether the arc center brightness of the sampled arc is less than the center brightness threshold range. If so, determine that the current discharge state is a too-weak discharge state. If not, determine whether the average brightness of the arc boundary area is greater than the boundary brightness threshold. If so, determine that the current discharge state is an over-strong discharge state. If not, determine that the current discharge state is a normal discharge state.

[0009] Preferably, when the welding machine is in the initial stage of discharge, if the arc center brightness of the sampled arc is less than the center brightness threshold range, the discharge intensity is enhanced, and the increase in discharge intensity is positively correlated with the difference in average brightness of the arc center area when the discharge is too weak and when the discharge is normal.

[0010] Preferably, when the welding machine is in the initial stage of discharge, if the average brightness of the arc boundary area of ​​the sampled arc is greater than the boundary brightness threshold, the discharge intensity is reduced, and the reduction in discharge intensity is positively correlated with the difference in the average brightness of the arc boundary area when the discharge is too strong and when the discharge is normal.

[0011] Preferably, when the welding machine is in the discharge stabilization period, it is determined whether the arc width of the sampled arc is valid. If the arc width is valid, the arc width is used as a compensation parameter and compared with the corresponding benchmark characteristic value; if the arc width is invalid, the arc center brightness is used as a compensation parameter and compared with the corresponding benchmark characteristic value, wherein, when the arc brightness does not reach the brightness threshold of the arc width, the arc width at this time is invalid.

[0012] Preferably, when the arc width of the sampled arc is valid, it is determined whether the arc width of the sampled arc is within the arc width threshold range. If the arc width is less than the arc width threshold range, the discharge intensity is enhanced, and the increase in the discharge intensity is positively correlated with the difference in arc width between the too-weak discharge state and the normal discharge state.

[0013] If the arc width is greater than the arc width threshold range, the discharge intensity is weakened, and the reduction in discharge intensity is positively correlated to the difference in arc width between the over-discharge state and the normal discharge state.

[0014] Preferably, when the arc width of the sampled arc is invalid, the current discharge is too weak, and the discharge intensity is increased. The increase in discharge intensity is positively correlated to the difference in average brightness of the arc center area in the too weak discharge state and the normal discharge state.

[0015] The second object of the present invention is to provide a discharge compensation system for an optical fiber fusion splicer, comprising a control module MCU, a control module FPGA and a hardware circuit, wherein the control module MCU and the control module FPGA realize information interaction through the APB bus protocol; the control module FPGA comprises a discharge real-time compensation driving module and a DA driving module, wherein the discharge real-time compensation driving module comprises an arc sampling module, an arc reference acquisition module and a discharge compensation module, and the hardware circuit comprises an image sampling module and a discharge control circuit;

[0016] The arc sampling module is connected to the image sampling module and is used to calculate and cache arc characteristic values ​​for multiple frames of images collected by the image sampling module, wherein the arc characteristic values ​​include arc center brightness, arc boundary brightness and arc width;

[0017] The arc reference acquisition module is used to acquire reference characteristic values, select the arc characteristic values ​​of the key frames from the standard arc characteristic values ​​acquired by the arc sampling module as the reference characteristic values, and store them in the memory;

[0018] The discharge compensation module is connected to the discharge control circuit through the DA driving module. During the discharge compensation, the arc characteristic value of the current frame image sampled in real time by the arc sampling module is compared with the corresponding reference characteristic value stored in the arc reference acquisition module, and the DA driving module drives the discharge control circuit to adjust the discharge intensity according to the difference to achieve compensation;

[0019] The discharge compensation module selects arc center brightness or arc boundary brightness or arc width according to the discharge situation to compare with the corresponding reference characteristic value, thereby adjusting the discharge intensity and realizing discharge compensation, so that the compensated arc image approaches the standard arc image;

[0020] The discharge condition includes a discharge stage and a discharge state. The discharge stage includes an initial discharge period and a stable discharge period. The discharge state includes an under-discharge state, a normal discharge state, and an over-discharge state.

[0021] Preferably, the DA driving module is used to output a digital driving signal to a DA conversion circuit, and the digital driving signal is converted into an analog driving signal through the DA conversion circuit to drive the discharge control circuit. The DA driving module is controlled by the control module MCU when the welding machine is pre-discharging, and is controlled by the control module FPGA when the welding machine is officially discharging.

[0022] The beneficial effects of the present invention are as follows: the optical fiber fusion splicer discharge compensation method and system, firstly, samples the arc state in real time during the entire discharge process and performs multiple real-time compensations. The arc state is always fed back to the compensation control program in real time, and the control program corrects the discharge parameters accordingly, which can improve the compensation stability. Secondly, in different discharge stages, the corresponding arc center brightness, arc boundary brightness and arc width are selected as compensation parameters according to different discharge states and compared with the corresponding reference characteristic values, and the discharge intensity is dynamically adjusted according to the difference to achieve discharge compensation. Real-time compensation and feedback according to actual conditions can improve the accuracy of discharge compensation.

[0023] When the optical fiber fusion splicer is in the initial stage of discharge, if the discharge is too weak, the arc center brightness is used as a compensation parameter for compensation; if the discharge is too strong, the arc boundary brightness is used as a compensation parameter for compensation. When the optical fiber fusion splicer is in the stable discharge period, under normal circumstances, the discharge compensation is achieved by adjusting the parameters of the fusion splicer by comparing the difference between the arc width of the current frame arc image and the corresponding benchmark characteristic value. Under abnormal circumstances, that is, when the arc width is invalid, the discharge compensation is achieved by adjusting the parameters of the fusion splicer by comparing the difference between the average brightness of the arc center area of ​​the current frame arc image and the corresponding benchmark characteristic value.

[0024] In addition, the driving source of the DA driving module includes the control module MCU and the control module FPGA. The driving source of the DA driving module is selected according to the actual situation for the different properties controlled by the control module MCU and the control module FPGA. The DA driving module is controlled by the control module MCU during the pre-discharge of the welding machine, which can reduce the occupation of the internal resources of the chip; the DA driving module is controlled by the control module FPGA during the formal discharge of the welding machine, which can improve the real-time performance of the driving signal and avoid data delay. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0026] Figure 1 is a system block diagram of the present invention;

[0027] Figure 2 is a structural block diagram of a reference sampling module of the present invention;

[0028] Figure 3 is a structural block diagram of the discharge compensation module of the present invention;

[0029] Figure 4 It is the arc image and arc level characteristic curve diagram of the present invention;

[0030] Figure 5The arc image and arc level characteristic curve diagram at the initial stage of discharge when the discharge is normal according to the present invention;

[0031] Figure 6 It is an arc image and arc level characteristic curve diagram at the initial stage of discharge when the discharge is too weak in the present invention;

[0032] Figure 7 It is an arc image and arc level characteristic curve diagram at the initial stage of discharge when the discharge is too strong in the present invention;

[0033] Figure 8 The arc image and arc level characteristic curve diagram of the present invention during the discharge stability period when the discharge is normal;

[0034] Fig. 9 The arc image and arc level characteristic curve diagram of the present invention during the discharge stability period when the discharge is too weak;

[0035] Fig.10 The arc image and arc level characteristic curve diagram of the present invention during the discharge stability period when the arc is invalid;

[0036] Fig.11 It is an arc image and arc level characteristic curve diagram of the discharge stability period when the discharge is too strong in the present invention;

[0037] Fig.12 It is a flow chart of arc characteristic value acquisition of the present invention;

[0038] Fig.13 is a flow chart of the discharge self-compensation of the present invention;

[0039] Fig.14 is a standard discharge curve diagram of the present invention;

[0040] Fig.15 It is a discharge weak compensation curve diagram of the present invention;

[0041] Fig.16 It is a discharge intensity compensation curve diagram of the present invention. DETAILED DESCRIPTION

[0042] Embodiment 1

[0043] like Figure 1 As shown, a discharge compensation system for an optical fiber fusion splicer includes a control module MCU, a control module FPGA and a hardware circuit. The control module MCU and the control module FPGA implement information exchange through the APB bus protocol.

[0044] like Figure 1 As shown, the control module FPGA includes a discharge real-time compensation driving module and a DA driving module, wherein the discharge real-time compensation driving module includes an arc sampling module, an arc reference acquisition module and a discharge compensation module.

[0045] The arc sampling module is connected to the CMOS image sensor of the hardware circuit, and is used to calculate and cache arc characteristic values ​​for multiple frames of images collected by the CMOS image sensor, wherein the arc characteristic values ​​include arc center brightness, arc boundary brightness and arc width.

[0046] The arc characteristic value is shown in the fiber fusion arc image and arc level characteristic curve. Figure 4 As shown. Among them, the arc center brightness is the brightness of the arc center point, the arc boundary brightness includes the arc left boundary brightness and the arc right boundary brightness, and the arc width is the length from the arc left boundary to the arc right boundary when the arc brightness reaches the brightness threshold.

[0047] like Figure 2 As shown, the arc reference acquisition module is used to collect reference characteristic values, and the arc characteristic values ​​of the key frame are selected as the reference characteristic values ​​from the standard arc characteristic values ​​collected by the arc sampling module, and stored in the memory. In this embodiment, the arc center brightness, arc boundary brightness and arc width as the reference characteristic values ​​are respectively stored in the corresponding dual-port RAM, which is convenient for data classification storage and reading.

[0048] like Figure 3 As shown, the discharge compensation module is used to compare the arc characteristic value of the current frame image sampled in real time by the arc sampling module with the corresponding reference characteristic value stored in the arc reference acquisition module during discharge compensation, and correct the discharge parameters of the welding machine according to the comparison result, and adjust the discharge intensity by driving the discharge control circuit in the hardware circuit through the DA driver module to achieve compensation.

[0049] In addition, the DA driving module is used to output a digital driving signal to the DA conversion circuit, and the DA conversion circuit converts the digital driving signal into an analog driving signal to drive the discharge control circuit. The DA driving module is controlled by the control module MCU or the control module FPGA.

[0050] According to the different properties of the control module MCU and the control module FPGA, the driving source of the DA driving module is selected according to the actual situation. Since the use of the control module MCU does not need to occupy the internal resources of the chip, the control module MCU controls the DA driving module when the welding machine is pre-discharging; and since the use of the control module FPGA has high real-time performance and can avoid data delay, the control module FPGA controls the DA driving module when the welding machine enters the formal discharge stage.

[0051] Since the state of the arc is a changing process at different stages of discharge, the discharge compensation module selects the best arc characteristic value as the compensation reference under different circumstances, that is, the discharge compensation module selects the arc center brightness or arc boundary brightness or arc width according to the discharge situation to compare with the corresponding reference characteristic value, thereby adjusting the discharge intensity and realizing discharge compensation, so that the compensated arc image approaches the standard arc image. Among them, in the whole discharge process, the discharge stage includes the initial discharge and the stable discharge period; the discharge state includes the too weak discharge state, the normal discharge state and the too strong discharge state.

[0052] Embodiment 2

[0053] The second aspect of the present invention proposes a discharge compensation method for a fiber optic fusion splicer. During the discharge process of the fiber optic fusion splicer, multiple real-time discharge compensations are performed according to the arc state. During the discharge compensation process, based on the real-time sampled arc image, the arc characteristic value of the current frame arc image is compared with the baseline characteristic value of the corresponding standard arc image. The discharge intensity is adjusted according to the difference between the two to achieve discharge compensation, so that the compensated arc image approaches the standard arc image.

[0054] The arc characteristic values ​​include arc center brightness, arc boundary brightness and arc width. The arc characteristic values ​​are shown in the fiber fusion arc image and arc horizontal characteristic curve. Figure 4 As shown. Among them, the arc center brightness is the brightness of the arc center point, the arc boundary brightness includes the arc left boundary brightness and the arc right boundary brightness, and the arc width is the length from the arc left boundary to the arc right boundary when the arc brightness reaches the brightness threshold.

[0055] In this embodiment, in order to improve the accuracy of discharge compensation, the arc center brightness is set to the brightness of the arc center area, that is, the average brightness of the arc center sampling area; the arc boundary brightness is set to the brightness of the arc boundary area, that is, the average brightness of the arc boundary sampling area; the brightness threshold is set to 200, that is, the arc width is the length from the left boundary of the arc to the right boundary of the arc when the arc brightness reaches 200.

[0056] Specifically, at different stages of discharge, the state of the arc is a changing process, and the corresponding discharge compensation method needs to be adjusted according to the current arc state. Among them, in the entire discharge process, the discharge stage includes the initial discharge period and the discharge stable period; the discharge state includes the too weak discharge state, the normal discharge state and the too strong discharge state.

[0057] The optical fiber fusion splicer discharge compensation method specifically comprises the following steps:

[0058] When the welding machine is in the initial stage of discharge, the discharge state is judged. If the discharge is too weak, the arc center brightness is used as a compensation parameter and compared with the corresponding benchmark characteristic value; if the discharge is too strong, the arc boundary brightness is used as a compensation parameter and compared with the corresponding benchmark characteristic value.

[0059] Among them, when the welding machine is in the initial stage of discharge, the process of judging the discharge state is as follows:

[0060] Determine whether the arc center brightness of the sampled arc is less than the center brightness threshold range. If so, determine that the current discharge state is a too-weak discharge state. If not, determine whether the arc boundary brightness is greater than the boundary brightness threshold. If so, determine that the current discharge state is an over-strong discharge state. If not, determine that the current discharge state is a normal discharge state.

[0061] Specifically, the fiber fusion arc image and arc level characteristic curve at the initial stage of discharge and normal discharge are as follows: Figure 5 As shown in the figure, the arc image and arc level characteristic curve of the optical fiber fusion arc when the discharge is too weak are as follows Figure 6 As shown in the figure, the arc image and arc level characteristic curve of the optical fiber fusion arc when the discharge is too strong are as follows Figure 7 shown.

[0062] First, when the optical fiber fusion splicer is in the initial stage of discharge, when the discharge is normal, Figure 5 The brightness of the arc center area is close to the sampling upper limit of 255 of the CMOS image sensor; when the discharge is too weak, Figure 6 The arc center brightness is low, with a value of about 200, and the average brightness of the arc center area is very low. Figure 5 and Figure 6 It can be seen that the arc center brightness when the discharge is too weak is significantly lower than the arc center brightness when the discharge is normal.

[0063] Therefore, when the fiber fusion splicer is in the initial stage of discharge, if the arc center brightness of the sampled arc is less than the center brightness threshold range, the discharge compensation module is driven to automatically increase the discharge intensity. The increase in discharge intensity is positively correlated with the difference in arc center brightness when the discharge is too weak and when the discharge is normal. In order to improve the compensation accuracy, the arc midpoint brightness is set to the average brightness of the arc center area.

[0064] Secondly, when the optical fiber fusion splicer is in the initial stage of discharge, when the discharge is normal, Figure 5 The brightness value of the left boundary of the arc is about 90, and the brightness value of the right boundary of the arc is about 75; when the discharge is too strong, Figure 7 The brightness value of the left edge of the arc is about 225, and the brightness value of the right edge of the arc is about 180. Figure 5 and Figure 7It can be seen that the arc boundary brightness when the discharge is too strong is significantly enhanced compared to the arc boundary brightness when the discharge is normal.

[0065] Therefore, when the fiber fusion splicer is in the initial stage of discharge, if the arc boundary brightness of the sampled arc is greater than the boundary brightness threshold range, the discharge compensation module is driven to automatically reduce the discharge intensity. The reduction in discharge intensity is positively correlated with the difference in arc boundary brightness when the discharge is too strong and when the discharge is normal. In order to improve the compensation accuracy, the arc boundary brightness is set to the average brightness of the arc boundary area.

[0066] In summary, at the beginning of discharge, the arc is weaker than in the stable period. If the arc is too strong, the brightness of the arc boundary will be obvious; if the arc is too weak, the brightness of the arc center will be obvious. Therefore, at the beginning of discharge, the discharge is judged to be too strong based on the brightness of the arc boundary, and the discharge is judged to be too weak based on the brightness of the arc center, and a discharge compensation is performed.

[0067] When the welding machine is in the discharge stability period, determine whether the arc width of the sampled arc is valid. If the arc width is valid, the arc width is used as a compensation parameter and compared with the corresponding benchmark characteristic value; if the arc width is invalid, the arc center brightness is used as a compensation parameter and compared with the corresponding benchmark characteristic value. When the arc brightness does not reach the brightness threshold of the arc width, the arc width is invalid at this time.

[0068] Specifically, in the discharge stability stage, the fiber fusion arc image and arc level characteristic curve when the discharge is normal are as follows: Figure 8 As shown in the figure, the arc image and arc level characteristic curve of the optical fiber fusion arc when the discharge is too weak are as follows Fig. 9 As shown in the figure, the arc image and arc level characteristic curve of optical fiber fusion when the discharge is too weak and the arc is invalid are as follows Fig.10 As shown in the figure, the arc image and arc level characteristic curve of the optical fiber fusion arc when the discharge is too strong are as follows Fig.11 shown.

[0069] When the optical fiber fusion splicer is in the discharge stable stage and the discharge is normal, Figure 8 The arc width is about 650; when the discharge is too weak, Fig. 9 The arc width is about 225. Figure 8 , Fig. 9 It can be seen that the arc width when the discharge is too weak is significantly smaller than the arc width when the discharge is normal.

[0070] Therefore, when the optical fiber fusion splicer is in the discharge stabilization period, if the arc width of the sampled arc is less than the arc width threshold range, the discharge compensation module is driven to automatically enhance the discharge intensity. The increase in discharge intensity is positively correlated with the difference in arc width between the too-weak discharge state and the normal discharge state.

[0071] In addition, when the discharge is too weak, there is an abnormal situation where the arc width is invalid, such as Fig.10 As shown, the arc brightness does not reach the arc width brightness threshold 200, and the arc width is invalid at this time.

[0072] Therefore, when the optical fiber fusion splicer is set in the discharge stabilization period, when the discharge compensation module detects the invalid arc width, the arc center brightness is used as a compensation parameter and compared with the corresponding benchmark characteristic value. At this time, the discharge compensation module is driven to automatically enhance the discharge intensity. The increase in discharge intensity is positively correlated with the difference in arc center brightness when the discharge is too weak and when the discharge is normal.

[0073] When the optical fiber fusion splicer is in the discharge stable stage and the discharge is normal, Figure 8 The arc width is about 650, and when the discharge is too strong, Fig.11 The arc width is about 750; Figure 8 , Fig.11 It can be seen that the arc width when the discharge is too strong is significantly greater than the arc width when the discharge is normal.

[0074] Therefore, when the optical fiber fusion splicer is set in the discharge stabilization period, if the arc width of the sampled arc is greater than the arc width threshold range, the discharge compensation module is driven to automatically weaken the discharge intensity. The reduction in discharge intensity is positively correlated with the difference in arc width between the over-discharge state and the normal discharge state.

[0075] By performing real-time sampling during the discharge process, and selecting the arc center brightness, arc boundary brightness or arc width according to different discharge conditions to compare with the corresponding benchmark characteristic values, and performing multiple discharge compensations based on the comparison results, the compensation accuracy is further improved on the basis of realizing compensation feedback.

[0076] Embodiment 3

[0077] The process of this embodiment is basically the same as that of the second embodiment, except that: the arc reference acquisition process in this embodiment is: the standard arc image corresponding to the current welding machine is acquired by the CMOS image sensor, and the arc characteristic values ​​of the multiple frames of arc images acquired by the CMOS image sensor are calculated by the arc sampling module to obtain the arc center brightness, arc boundary brightness and arc width of each frame of the arc image and store them, and then the arc characteristic value of the key frame image in the multiple frames of arc images is selected as the reference characteristic value by the arc reference acquisition module.

[0078] The frame rate of the CMOS image sensor used in this embodiment is 30 frames / second, and the discharge time is 2.5 seconds, so the total number of sampling frames is set to 75 frames. Correspondingly, the key frames selected in this embodiment are the 8th frame, the 16th frame, the 24th frame, the 40th frame, the 48th frame, the 56th frame, the 64th frame, and the 72nd frame. Among them, the 8th frame, the 16th frame, and the 24th frame are in the initial stage of discharge, and the 40th frame, the 48th frame, the 56th frame, the 64th frame, and the 72nd frame are in the stable period of discharge.

[0079] Specifically, Fig.12 As shown in FIG. 1 , the arc reference acquisition process includes the following steps:

[0080] Before sampling the discharge arc, turn off the lights of the X and Y channels of the fiber fusion splicer.

[0081] Initialize the operating parameters of the CMOS image sensor, including exposure.

[0082] Initialize the working parameters of the arc sampling module, including the arc center sampling area, the arc boundary area sampling range, and the arc width judgment threshold.

[0083] Set the current working mode of the optical fiber fusion splicer discharge compensation system to acquisition mode.

[0084] Initialize the total number of sampling frames. Since the frame rate of the CMOS image sensor used in this embodiment is 30 frames / second and the discharge time is 2.5 seconds, the total number of sampling frames is set to 75 frames.

[0085] When the optical fiber fusion splicer discharges, the arc reference acquisition module is synchronously enabled and frame counting begins.

[0086] Determine whether the frame count is less than the set total number of sampling frames. If so, the arc reference acquisition module accesses the arc center brightness, arc width and arc boundary brightness of the current frame, and then determines whether the frame count is less than the set total number of sampling frames. If not, it means that all frame sampling is completed and the arc feature value of the key frame arc image is extracted.

[0087] The average brightness of the arc center area in the 8th frame is read as the reference characteristic value corresponding to the initial stage of discharge;

[0088] The average brightness of the arc boundary at the 16th frame is read as the reference characteristic value corresponding to the initial stage of discharge;

[0089] The average brightness of the arc center area in the 24th frame is read as the reference characteristic value corresponding to the initial stage of discharge;

[0090] The arc widths of the 40th, 48th, 56th, 64th and 72nd frames are read as the reference characteristic values ​​corresponding to the discharge stable period, and the average brightness of the arc center area of ​​the 40th, 48th, 56th, 64th and 72nd frames are read as the reference characteristic values ​​corresponding to the discharge stable period.

[0091] In summary, the arc reference acquisition module has a total of 8 sampling frames, namely the 8th, 16th, and 24th frames at the initial discharge stage and the 40th, 48th, 56th, 64th, and 72nd frames at the stable discharge stage. Therefore, compensation will be performed up to 8 times during the entire discharge process.

[0092] It should be noted that the arc reference acquisition process requires multiple sampling at the beginning of discharge and during the discharge stabilization period to ensure the reliability of the sampling results.

[0093] Embodiment 4

[0094] like Fig.13 As shown, the structure of this embodiment is basically the same as that of the second embodiment, except that the discharge compensation process in this embodiment includes the following steps:

[0095] First turn off the lights of the X and Y channels of the fiber fusion splicer.

[0096] Initialize the operating parameters of the CMOS image sensor, including exposure.

[0097] Initialize the working parameters of the arc sampling module, including the arc center sampling area, the arc boundary area sampling range, and the arc width judgment threshold.

[0098] Set the current working mode of the discharge compensation system of the optical fiber fusion splicer to the discharge compensation mode.

[0099] The discharge compensation module reads the key frame arc characteristic values ​​stored in the arc reference acquisition module as reference characteristic values ​​for discharge compensation.

[0100] Sets the initial discharge intensity.

[0101] The software controls the discharge circuit to prevent electric shock. At this time, the DA driver module is driven by the control module MCU.

[0102] After the pre-discharge is completed, the DA driving module at this time is controlled by the discharge compensation module in the control module FPGA control, so as to increase the transmission speed of the driving signal and avoid the delay of the driving signal.

[0103] Enable the discharge compensation module of the control module FPGA and start frame counting. At this time, the default discharge intensity is used for discharge.

[0104] At the beginning of discharge, the average brightness of the arc center area of ​​the 8th frame arc image is determined. If the average brightness of the arc center area is less than the corresponding reference characteristic value, the first compensation is performed to enhance the discharge intensity.

[0105] The arc boundary brightness of the 16th frame arc image is determined. If the arc boundary brightness is greater than the corresponding reference characteristic value, a second compensation is performed to reduce the discharge intensity.

[0106] The average brightness of the arc center area of ​​the 24th frame of the arc image is determined. If the average brightness of the arc center area is less than the corresponding reference characteristic value, a third compensation is performed to enhance the discharge intensity.

[0107] During the discharge stabilization period, determine whether the arc brightness of the 40th, 48th, 56th, 64th, and 72nd arc image frames reaches the brightness threshold of the arc width. If not, it means that the current arc width is invalid, which means that the discharge is too weak. At this time, the discharge intensity is enhanced according to the difference between the average brightness of the arc center area and the corresponding benchmark characteristic value. If it is reached, determine the arc width of the 40th, 48th, 56th, 64th, and 72nd arc image frames. If the arc width is less than the corresponding benchmark characteristic value, the discharge intensity is enhanced. If the arc width is greater than the corresponding benchmark characteristic value, the discharge intensity is reduced.

[0108] Among them, discharge compensation is performed at most three times in the initial stage of discharge, and at most five times in the stable discharge period. Therefore, during the entire discharge process, the arc state is determined 8 times and compensation is performed at most 8 times.

[0109] Embodiment 5

[0110] In this embodiment, a standard discharge arc curve of a fiber fusion splicer is sampled as follows: Fig.14 As shown, the entire discharge process is 75 frames in total, and the figure marks the arc boundary brightness benchmark of the 16th frame, the arc center brightness benchmark of the 8th and 24th frames, and the arc center brightness benchmark and arc width benchmark of the 40th to 75th frames.

[0111] The compensation process curve of the optical fiber fusion splicer when the discharge is too weak is as follows Fig.15 As shown, at the initial stage of discharge, by sampling the brightness of the arc center area, it was found that the discharge was too weak, so the first compensation was performed in the 8th frame. After compensation, the arc center brightness in the 24th frame reached the benchmark level. The discharge stabilization period began with compensation in the 40th frame. Through five arc characteristic value comparisons and compensations in the 40th, 48th, 56th, 64th, and 72nd frames, it can be clearly seen that the real-time arc width curve is fitted to the standard arc width curve, and finally stability is achieved.

[0112] The compensation process curve of the optical fiber fusion splicer when the discharge is too strong is as follows Fig.16As shown, by sampling the arc boundary brightness at the beginning of the discharge, it was found that the discharge was too strong, so the first compensation was performed in the 16th frame. The compensation began in the 40th frame during the discharge stabilization period. By comparing and compensating the arc characteristic values ​​five times in the 40th, 48th, 56th, 64th, and 72nd frames, it can be clearly seen that the real-time arc width curve is fitted to the standard arc width curve, and finally stability is achieved.

[0113] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention is described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A discharge compensation method for an optical fiber fusion splicer, characterized in that: During the discharge process of the welding machine, multiple real-time discharge compensations are performed according to the arc state. During the discharge compensation process, based on the real-time sampled arc image, the arc characteristic value of the current frame arc image is compared with the reference characteristic value of the corresponding standard arc image. The discharge intensity is adjusted according to the difference between the two to achieve discharge compensation, so that the compensated arc image approaches the standard arc image. The arc characteristic values ​​include arc center brightness, arc boundary brightness and arc width; The discharge condition includes a discharge stage and a discharge state. The discharge stage includes an initial discharge period and a stable discharge period. The discharge state includes an under-discharge state, a normal discharge state, and an over-discharge state.

2. The optical fiber fusion splicer discharge compensation method according to claim 1, characterized in that: When the welding machine is in the initial stage of discharge, the current discharge state is judged. If the discharge is too weak, the arc center brightness is used as a compensation parameter and compared with the corresponding benchmark characteristic value; if the discharge is too strong, the arc boundary brightness is used as a compensation parameter and compared with the corresponding benchmark characteristic value.

3. The optical fiber fusion splicer discharge compensation method according to claim 2, characterized in that: When the welding machine is in the initial stage of discharge, the process of judging the current discharge state is as follows: Determine whether the arc center brightness of the sampled arc is less than the center brightness threshold range. If so, determine that the current discharge state is a too-weak discharge state. If not, determine whether the average brightness of the arc boundary area is greater than the boundary brightness threshold. If so, determine that the current discharge state is an over-strong discharge state. If it is not greater than, the current discharge state is determined to be a normal discharge state.

4. The optical fiber fusion splicer discharge compensation method according to claim 1 or 3, characterized in that: When the welding machine is in the initial stage of discharge, if the arc center brightness of the sampled arc is less than the center brightness threshold range, the discharge intensity is enhanced. The increase in discharge intensity is positively correlated with the difference in average brightness of the arc center area when the discharge is too weak and when the discharge is normal.

5. The optical fiber fusion splicer discharge compensation method according to claim 1 or 3, characterized in that: When the welding machine is in the initial stage of discharge, if the average brightness of the arc boundary area of ​​the sampled arc is greater than the boundary brightness threshold, the discharge intensity is reduced. The reduction in discharge intensity is positively correlated with the difference in the average brightness of the arc boundary area when the discharge is too strong and when the discharge is normal.

6. The optical fiber fusion splicer discharge compensation method according to claim 1, characterized in that: When the welding machine is in the discharge stable period, it is determined whether the arc width of the sampled arc is valid. If the arc width is valid, the arc width is used as a compensation parameter and compared with the corresponding reference characteristic value. If the arc width is invalid, the arc center brightness is used as a compensation parameter and compared with the corresponding reference characteristic value, wherein when the arc brightness does not reach the brightness threshold of the arc width, the arc width is invalid at this time.

7. The optical fiber fusion splicer discharge compensation method according to claim 6, characterized in that: When the arc width of the sampled arc is valid, it is determined whether the arc width of the sampled arc is within the arc width threshold range. If the arc width is less than the arc width threshold range, the discharge intensity is enhanced. The increase in the discharge intensity is positively correlated with the difference in arc width between the too-weak discharge state and the normal discharge state. If the arc width is greater than the arc width threshold range, the discharge intensity is weakened, and the reduction in discharge intensity is positively correlated to the difference in arc width between the over-discharge state and the normal discharge state.

8. The optical fiber fusion splicer discharge compensation method according to claim 6, characterized in that: When the arc width of the sampled arc is invalid, the current state is too weak discharge, and the discharge intensity is enhanced. The increase in discharge intensity is positively correlated with the difference in average brightness of the arc center area when the discharge is too weak and when the discharge is normal.

9. A discharge compensation system for an optical fiber fusion splicer, characterized in that: It includes a control module MCU, a control module FPGA and a hardware circuit, wherein the control module MCU and the control module FPGA realize information exchange through the APB bus protocol; The control module FPGA includes a discharge real-time compensation driving module and a DA driving module, wherein the discharge real-time compensation driving module includes an arc sampling module, an arc reference acquisition module and a discharge compensation module, and the hardware circuit includes an image sampling module and a discharge control circuit; The arc sampling module is connected to the image sampling module and is used to calculate and cache arc characteristic values ​​for multiple frames of images collected by the image sampling module, wherein the arc characteristic values ​​include arc center brightness, arc boundary brightness and arc width; The arc reference acquisition module is used to acquire reference characteristic values, select the arc characteristic values ​​of the key frames from the standard arc characteristic values ​​acquired by the arc sampling module as the reference characteristic values, and store them in the memory; The discharge compensation module is connected to the discharge control circuit through the DA driving module. During the discharge compensation, the arc characteristic value of the current frame image sampled in real time by the arc sampling module is compared with the corresponding reference characteristic value stored in the arc reference acquisition module, and the DA driving module drives the discharge control circuit to adjust the discharge intensity according to the difference to achieve compensation; The discharge compensation module selects arc center brightness or arc boundary brightness or arc width according to the discharge situation to compare with the corresponding reference characteristic value, thereby adjusting the discharge intensity and realizing discharge compensation, so that the compensated arc image approaches the standard arc image; The discharge condition includes a discharge stage and a discharge state. The discharge stage includes an initial discharge period and a stable discharge period. The discharge state includes an under-discharge state, a normal discharge state, and an over-discharge state.

10. The optical fiber fusion splicer discharge compensation system according to claim 9, characterized in that: The DA driving module is used to output a digital driving signal to the DA conversion circuit, and the digital driving signal is converted into an analog driving signal through the DA conversion circuit to drive the discharge control circuit. The DA driving module is controlled by the control module MCU when the welding machine is pre-discharging, and is controlled by the control module FPGA when the welding machine is officially discharging.

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