A method for discrete array light guide signal detection

Abstract

The present application relates to the field of optical fiber sensing, optical fiber communication, optical imaging technology, and discloses a method for discrete array light guide signal detection, which comprises transmitting the image or signal output by the light guide signal device array to an image acquisition and signal processing unit through an image transmission assembly, and performing data analysis and signal calculation after data acquisition. The present application can integrate multiple light guide type signal device output tail fiber end faces, realize centralized image acquisition and signal transmission of the light guide signal device array output signal, has no requirement for the consistency of the function performance between the integrated light guide type or sensor, can reduce the size of the image transmission cable, make the application scene adaptability stronger, effectively improve the integration of the distributed measurement system based on the discrete light guide signal device or sensor array, reduce the system complexity, improve the measurement efficiency, and the components are composed of all passive optical devices, which has strong anti-interference and high reliability.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of optical fiber sensing, optical fiber communication and optical imaging technology, in particular to a method for discrete array light guide signal detection. BACKGROUND

[0002] Optical fiber is a kind of optical signal transmission medium made of glass or polymer, and is the main product of high-speed and large-capacity communication at present, which has the characteristics of intrinsic safety and anti-electromagnetic interference. The non-intrinsic optical fiber sensor uses optical fiber as the transmission medium of sensing signal, and utilizes the characteristics of fast transmission rate, large capacity and high bandwidth to realize safe and fast measurement. Due to the light guide characteristics of optical fiber, it is not only suitable for the transmission of modulated optical signals, but also supports direct image transmission, and the complete image can be transmitted through the end-to-end arranged optical fiber bundle.

[0003] At present, the image transmission optical fiber is mainly used for direct image transmission application, and the typical one is mainly optical fiber endoscope, and there are few applications in the field of optical fiber sensing. At present, most of the measurement signal devices are single-channel systems, which return signals to the host computer through cables or wireless communication. In the field of aerospace, electrical signals or wireless signals are easily disturbed, which affects the accuracy of signal reception. The light guide signal device is a sensor based on spatial light modulation, which is generally composed of optical fiber and spatial light modulation element. When detecting the measured object, the optical fiber light path is turned on or interrupted, and whether the measured object is detected is judged according to the output light intensity of the receiving end optical fiber end face. For the distributed application of light guide type signal device or sensor, there is a lack of a high-reliability module or device that can centrally process the output signals of numerous sensors to reduce the complexity of the measurement system, optimize the system design and improve the measurement efficiency. SUMMARY

[0004] The purpose of the present application is to provide a method for discrete array light guide signal detection, which solves the problems of low reliability in central processing of numerous sensor output signals and low processing efficiency of single-channel system in the prior art.

[0005] The present application is realized by the following technical scheme: a method for discrete array light guide signal detection, which comprises transmitting the image or signal output by the light guide signal device array to the image acquisition and signal processing unit through the image transmission assembly, collecting data by the image acquisition and signal processing unit, and performing data analysis and signal calculation, specifically:

[0006] Step S1: pre-processing the discrete spot array image collected by the image sensor in the image acquisition and signal demodulation unit;

[0007] Step S2: when all the spots in the discrete spot array image are bright, positioning all the spots, establishing a two-dimensional system, and mapping the coordinate value to the spot distribution position;

[0008] Step S3: encode each discrete light guide signalizer in the light guide signalizer array by position information of each light spot in the discrete light spot array image;

[0009] Step S4: average the sum of the gray values of the output light spot corresponding to the same light guide signalizer in the constant light and constant dark states, and the average value is the threshold value for judging the light guide signalizer;

[0010] Step S5: compare the gray value of the output light spot corresponding to the light guide signalizer with the threshold value; when the gray value of the output light spot is greater than the threshold value, it indicates that the object to be detected is detected, and when the gray value of the output light spot is less than the threshold value, it indicates that the object to be detected is not detected.

[0011] In order to better realize the present application, further, the pre-processing of the discrete light spot array image in step S1 includes gray processing and filtering processing, and the noise points in the light spot array image are removed.

[0012] In order to better realize the present application, further, when the discrete light guide signalizer in the light guide signalizer array is encoded in step S2, the encoding information includes the installation position of the light guide signalizer and the measurement information.

[0013] In order to better realize the present application, further, the image transmission assembly includes an image transmission cable and an image transmission cable input end connector and an image transmission cable output end connector installed at the end of the image transmission cable; wherein the light guide signalizer array is connected with the image transmission cable through the image transmission cable input end connector, and the image acquisition and signal processing unit is connected with the image transmission cable through the image transmission cable output end connector; the image transmission cable input end connector is used to reduce the image output by the light guide signalizer, and the image transmission cable output end connector is used to re-magnify the image output by the image transmission cable input end connector.

[0014] In order to better realize the present application, further, the image transmission cable input end connector includes an input end housing and an input end image transmission unit installed in the input end housing, the input end housing includes a tail fiber bundle outlet lead wire device, an input end external thread hollow nut and an input end sleeve nut which are detachably connected; the input end image transmission unit includes a fiber holder installed on the tail fiber bundle outlet lead wire device and an input end image transmission light cone; one end of the image transmission cable is sleeved on the input end conical sleeve installed in the input end sleeve nut; the input end external thread hollow nut limits the fiber holder, the input end image transmission light cone and the input end conical sleeve respectively.

[0015] The image transmission cable output end connector comprises an output end shell and an output end image transmission unit installed in the output end shell, the output end shell comprises a detachable connecting plug, an output end outer threaded hollow nut and an output end sleeve nut, the output end image transmission unit comprises an output end image transmission light cone installed on the plug, the other end of the image transmission cable is sleeved on the output end conical sleeve installed in the plug, and the output end outer threaded hollow nut limits the output end image transmission light cone and the output end conical sleeve respectively.

[0016] The image transmission cable is composed of an optical fiber bundle and an optical fiber bundle sheath, and the optical fiber bundle comprises a plurality of optical fibers.

[0017] In order to better realize the present application, further, the input end outer threaded hollow nut is installed with an input end anti-halo glass sheet, the input end anti-halo glass sheet is between the input end image transmission light cone and the input end conical sleeve, the plug is installed with an output end anti-halo glass sheet, and the output end anti-halo glass sheet is between the plug and the output end image transmission light cone.

[0018] In order to better realize the present application, further, the input end outer threaded hollow nut is installed with an input end anti-halo glass sheet first gasket and an input end anti-halo glass sheet second gasket, the input end anti-halo glass sheet first gasket and the input end anti-halo glass sheet second gasket are respectively distributed on both sides of the input end anti-halo glass sheet, the plug is installed with an output end anti-halo glass sheet first gasket and an output end anti-halo glass sheet second gasket, and the output end anti-halo glass sheet first gasket and the output end anti-halo glass sheet second gasket are respectively distributed on both sides of the output end image transmission light cone.

[0019] In order to better realize the present application, further, the input end sleeve nut is installed with an input end annular sleeve, the end of the image transmission cable passes through the input end annular sleeve, the input end annular sleeve is between the input end conical sleeve and the input end sleeve nut, the plug is installed with an output end annular sleeve, the end of the image transmission cable passes through the output end annular sleeve, and the output end annular sleeve is between the output end conical sleeve and the output end sleeve nut.

[0020] In order to better realize the present application, further, the output end outer threaded hollow nut is installed with an output end image transmission light cone gasket, the output end image transmission light cone gasket is between the output end image transmission light cone and the output end conical sleeve, and the tail fiber bundle outlet lead wire device is installed with a retainer gasket, the retainer gasket is between the optical fiber retainer and the input end image transmission light cone.

[0021] In order to better realize the present application, further, the tail fiber bundle outlet lead wire device is respectively screwed with the input end outer threaded hollow nut and the input end sleeve nut, and the plug is respectively screwed with the output end outer threaded hollow nut and the output end sleeve nut.

[0022] Compared with the prior art, the present application has the following advantages and beneficial effects:

[0023] (1) The present application can integrate multiple light guide type signalers or sensor output tail fiber end faces, realize centralized image acquisition and signal transmission of the signaler or sensor array output signal, and has no requirement for the consistency of the function performance of the integrated light guide type or sensor;

[0024] (2) The present application can reduce the size of the image transmission cable through the image amplification and reduction function of the image transmission cable input end connector and the image transmission cable output end connector, so that the application scene adaptability is stronger;

[0025] (3) The present application can effectively improve the integration of the distributed measurement system based on the discrete light guide signaler or sensor array, reduce the system complexity, and improve the measurement efficiency;

[0026] (4) The components in the present application are composed of all-passive optical devices, which have strong anti-interference and high reliability characteristics. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 It is a whole process schematic diagram of the present application.

[0028] Figure 2 It is a light spot distribution schematic diagram.

[0029] Figure 3 It is a whole structure schematic diagram of the image transmission assembly.

[0030] Figure 4 It is a whole structure explosion diagram of the image transmission cable input end connector.

[0031] Figure 5 It is a whole structure explosion diagram of the image transmission cable output end connector.

[0032] Wherein: 1-image transmission cable input end connector; 2-image transmission cable output end connector; 3-image transmission cable; 101-tail fiber bundle outlet lead wire device; 102-optical fiber holder; 103-holder gasket; 104-input end image transmission light cone; 105-input end outer threaded hollow nut; 106-input end anti-halo glass first gasket; 107-input end anti-halo glass; 108-input end anti-halo glass second gasket; 109-input end conical sleeve; 110-input end ring-shaped sleeve; 111-input end sleeve nut; 201-plug; 202-output end anti-halo glass first gasket; 203-output end anti-halo glass; 204-output end anti-halo glass second gasket; 205-output end image transmission light cone; 206-output end outer threaded hollow nut; 207-output end image transmission light cone gasket; 208-output end conical sleeve; 209-output end ring-shaped sleeve; 210-output end sleeve nut. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0034] Embodiment 1

[0035] The embodiment provides a method for discrete array light guide signal detection, specifically as shown in the figure, by transmitting the image or signal output by the light guide signal array to the image acquisition and signal processing unit through the image transmission assembly, the image acquisition and signal processing unit is used for data acquisition and data analysis and signal calculation on the image or signal. Specifically: Figure 1

[0036] Step S1, pre-processing the discrete light spot array image collected by the image sensor in the image acquisition and signal demodulation unit; the pre-processing includes gray processing, filtering processing and eliminating the noise points in the light spot array image.

[0037] Step S2, when all the light spots in the discrete light spot array image are bright, positioning all the light spots, establishing a two-dimensional system, and mapping the coordinate value to the light spot distribution position.

[0038] Step S3, encoding the discrete light guide signal in the light guide signal array one by one through the position information of each light spot in the discrete light spot array image; the encoding information mainly includes the installation position of the light guide signal and the measurement information, so as to realize the independent detection of each signal.

[0039] Step S4, averaging the sum of the gray values of the output light spots of the same light guide signal in the bright and dark states, and taking the average value as the threshold value for judging the light guide signal.

[0040] Step S5, comparing the gray value of the output light spot corresponding to the light guide signal with the threshold value; when the gray value of the output light spot is greater than the judgment threshold value, it indicates that the measured object is detected, and when the gray value of the output light spot is less than the judgment threshold value, it indicates that the measured object is not detected.

[0041] In the embodiment, each light guide signal measurement channel is independent, and the output light spots of the tail fiber end faces of each signal are independent of each other; the light guide signal array is composed of a plurality of light guide signals.

[0042] In the embodiment, the bright light spot indicates that the measured object is detected, the light path is on, and the dark light spot indicates that the measured object is not detected, and the light path is interrupted. Referring to Figure 2 ​As shown in the figure, the discrete spot array image collected by the image sensor, when the output spot gray value corresponding to the light guide signal indicator is greater than the judgment threshold, indicates that the detected object is detected, and when the output spot gray value is less than the judgment threshold, it indicates that the detected object is not detected. Thus, in the system host computer, according to the light guide signal indicator coding information, the state of the discrete array light guide signal indicator can be monitored and distributed measurement data analysis.

[0043] In summary, the technical scheme can integrate multiple light guide signal indicators or sensor output tail fiber end faces, realize centralized image acquisition and signal transmission of the signal indicator or sensor array output signal, and has no requirement for the functional performance consistency of the integrated light guide or sensor.

[0044] The technical scheme can effectively improve the integration of the distributed measurement system based on the discrete light guide signal indicator or sensor array, reduce the system complexity, and improve the measurement efficiency. The entire device is composed of all-passive optical devices, has strong anti-interference and high reliability characteristics.

[0045] Embodiment 2:

[0046] This embodiment is further extended on the basis of embodiment 1, and specifically as Figure 3 As shown in the figure, the image transmission assembly includes an image transmission cable input end connector 1, an image transmission cable output end connector 2, and an image transmission cable 3. The image transmission cable input end connector 1 is connected to one end of the image transmission cable 3, and the image transmission cable output end connector 2 is connected to the other end of the image transmission cable 3. The signal is input from the image transmission cable input end connector 1, conducted through the image transmission cable output end connector 2 to the image transmission cable 3, and output. The light guide signal indicator array is connected to the image transmission cable 3 through the image transmission cable input end connector 1, and the image acquisition and signal processing unit is connected to the image transmission cable 3 through the image transmission cable output end connector 2. The image transmission cable input end connector 1 is used to reduce the image output by the light guide signal indicator, and the image transmission cable output end connector 2 is used to enlarge the image output by the image transmission cable input end connector 1.

[0047] As shown in the figure, Figure 4 The image transmission cable input end connector 1 includes an input end housing and an input end image transmission unit mounted in the input end housing. The input end housing includes a tail fiber bundle outlet lead wire device 101, an input end sleeve nut 111, an input end external thread hollow nut 105, and an input end tapered sleeve 109. The input end image transmission unit includes a fiber holder 102 and an input end image transmission optical taper 104.

[0048] The tail fiber bundle outlet lead-out device 101 is detachably connected with the input end sleeve nut 111, and the tail fiber bundle outlet lead-out device 101 is detachably connected with the input end outer threaded hollow nut 105; the fiber holder 102 and the input end image transmission light cone 104 are both mounted on the tail fiber bundle outlet lead-out device 101; the input end tapered sleeve 109 is mounted in the input end sleeve nut 111, and one end of the image transmission cable 3 is sleeved into the input end tapered sleeve 109; the input end outer threaded hollow nut 105 limits the fiber holder 102, the input end image transmission light cone 104 and the input end tapered sleeve 109 respectively.

[0049] The image transmission cable 3 is composed of a fiber bundle and a fiber bundle sheath; the fiber bundle contains a plurality of optical fibers, and the optical fibers in the fiber bundle are arranged in an end-to-end manner; the image transmission resolution is related to the number of optical fibers in the fiber bundle and the diameter of the optical fibers; the more the number of optical fibers in the fiber bundle and the smaller the diameter of the optical fibers, the higher the image transmission resolution; the image transmission size is related to the combined diameter of the fiber bundle; the larger the combined diameter of the fiber bundle, the larger the size of the supported transmission image.

[0050] When the image transmission cable input end connector 1 and the image transmission cable 3 are assembled, the optical fiber tail fiber bundle of the light guide signal device passing through the tail fiber bundle outlet lead-out device 101 is inserted into the fiber holder 102; after the fiber holder 102 is ground flat by a grinder, it is placed on the annular support boss in the tail fiber bundle outlet lead-out device 101, and then the input end image transmission light cone 104 is placed in the tail fiber bundle outlet lead-out device 101, so that the input end image transmission light cone 104 is completely attached to the ground end face of the fiber holder 102; at this time, the input end outer threaded hollow nut 105 is buckled with the tail fiber bundle outlet lead-out device 101, so that the input end outer threaded hollow nut 105 tightly presses the fiber holder 102 and the input end image transmission light cone 104 respectively; then the input end sleeve nut 111 and the input end tapered sleeve 109 are inserted into the end of the image transmission cable 3 in sequence, and the input end tapered sleeve 109 is fixed together with the end of the image transmission cable 3, the input end tapered sleeve 109 is placed in the input end outer threaded hollow nut 105, the outer diameter of the input end tapered sleeve 109 matches the inner diameter of the input end outer threaded hollow nut 105, so that the input end image transmission light cone 104 is coaxial with the image transmission cable 3 on the input end tapered sleeve 109; then the tail fiber bundle outlet lead-out device 101 is buckled with the input end sleeve nut 111, so that the annular support boss in the input end sleeve nut 111 tightly presses the input end tapered sleeve 109 in the input end outer threaded hollow nut 105, and the assembly of the image transmission cable input end connector 1 and the image transmission cable 3 is completed.

[0051] The optical fiber holder 102 has through holes arranged in a regular hexagon, and the hole diameters are adapted to receive the optical fiber tail fiber diameters of the optical signal transmitters, so as to fix the optical fiber tail fibers of all the optical signal transmitters and arrange the tail fiber end faces at equal distances, and the number of the through holes is equal to the number of the integrated optical signal transmitters or sensors; a plurality of optical signal transmitter or sensor output tail fiber end faces can be integrated at the same time for image acquisition and transmission

[0052] As shown in Figure 5 The output end connector of the image transmission cable 2 comprises an output end housing and an output end image transmission unit installed in the output end housing, the output end housing comprises a plug 201, an output end sleeve nut 210, an output end external thread hollow nut 206 and an output end conical sleeve 208; the output end image transmission unit comprises an output end image transmission light cone 205.

[0053] The plug 201 is detachably connected with the output end sleeve nut 210, and the plug 201 is detachably connected with the output end external thread hollow nut 206; the output end image transmission light cone 205 is installed in the plug 201; the plug 201 is installed with the output end conical sleeve 208, and the other end of the image transmission cable 3 is sleeved into the output end conical sleeve 208; the output end external thread hollow nut 206 limits the output end image transmission light cone 205 and the output end conical sleeve 208 respectively.

[0054] When the output end connector of the image transmission cable 2 and the image transmission cable 3 are assembled, the output end image transmission light cone 205 is placed in the plug 201, and then the output end external thread hollow nut 206 is buckled with the plug 201, so that the output end external thread hollow nut 206 tightly presses the output end image transmission light cone 205 on the plug 201; the end of the image transmission cable 3 is sequentially inserted into the output end sleeve nut 210 and the output end conical sleeve 208, and the end of the image transmission cable 3 is fixed with the output end conical sleeve 208, then the output end conical sleeve 208 is inserted into the output end external thread hollow nut 206, the inner diameter of the output end external thread hollow nut 206 matches the outer diameter of the output end conical sleeve 208, so as to realize the coaxiality of the output end image transmission light cone 205 and the image transmission cable 3 on the output end conical sleeve 208; then the output end sleeve nut 210 is buckled with the plug 201, so that the annular support boss in the output end sleeve nut 210 tightly presses the output end conical sleeve 208 in the output end external thread hollow nut 206, and the assembly of the output end connector of the image transmission cable 2 and the image transmission cable 3 is completed.

[0055] During operation, the fiber optic pigtail bundle in the optical signal transmitter outputs image information to the image transmission cable input connector 1. The image information received at the image transmission cable input connector 1 is reduced in size and then transmitted to the image transmission cable 3. The image transmission cable 3 transmits the reduced image information to the image transmission cable output connector 2. The image transmission cable output connector 2 then re-enlarges the reduced image and outputs it again.

[0056] Furthermore, the input image transmission cone 104 and the output image transmission cone 205 have the same specifications. That is, after the input image transmission cone 104 reduces the image information by a certain ratio, the output image transmission cone 205 can re-enlarge the reduced image information back to its original size.

[0057] The image magnification and reduction functions of the image transmission optical cable input connector 1 and the image transmission optical cable output connector 2 can reduce the size of the image transmission optical cable input connector 016, making it more adaptable to various application scenarios.

[0058] Example 3:

[0059] This embodiment is a further extension of embodiment 2, as follows: Figure 4 , Figure 5 As shown, the input end image transmission unit also includes an input end anti-halo glass plate 107, which is installed on the input end external thread hollow nut 105 and is located between the input end image transmission light cone 104 and the input end conical sleeve 109.

[0060] During assembly, first place the input end anti-halo glass plate 107 on the annular support boss inside the input end external thread hollow nut 105, and then put in the input end conical ferrule 109. The input end ferrule nut 111 presses the input end conical ferrule 109 and the input end anti-halo glass plate 107 together.

[0061] like Figure 4 , Figure 5 As shown, the output image transmission unit also includes an output anti-halo glass plate 203, which is installed in the plug 201 and is located between the plug 201 and the output image transmission light cone 205.

[0062] During assembly, first place the output anti-halo glass plate 203 on the annular support boss inside the plug 201, and then insert the output image transmission cone 205. The output external thread hollow nut 206 presses the output image transmission cone 205 and the output anti-halo glass plate 203 together.

[0063] By setting an anti-halo glass plate 107 at the input end and an anti-halo glass plate 203 at the output end, stray light can be filtered out and halos can be eliminated from the light spot image to improve image clarity.

[0064] In another specific embodiment, as shown in Figure 4 、 Figure 5 , the input end image transmission unit further comprises an input end anti-halo glass first gasket 106 and an input end anti-halo glass second gasket 108, which are installed in the input end outer threaded hollow nut 105 and distributed on both sides of the input end anti-halo glass 107.

[0065] As shown in Figure 4 、 Figure 5 , the output end image transmission unit further comprises an output end anti-halo glass first gasket 202 and an output end anti-halo glass second gasket 204, which are installed in the plug 201 and distributed on both sides of the output end image transmission light cone 205.

[0066] By setting the input end anti-halo glass first gasket 106, the input end anti-halo glass second gasket 108, the output end anti-halo glass first gasket 202, and the output end anti-halo glass second gasket 204, the input end anti-halo glass 107 and the output end anti-halo glass 203 can be buffered and limited, the pressure can be dispersed, and the rigid contact between the input end anti-halo glass 107 and the output end anti-halo glass 203 and other parts can be effectively prevented, and at the same time, the input end anti-halo glass 107 and the output end anti-halo glass 203 are more firmly limited.

[0067] In another specific embodiment, as shown in Figure 4 、 Figure 5 , the input end image transmission unit further comprises an input end ring-shaped sleeve 110, which is installed in the input end sleeve nut 111, the end of the image transmission cable 3 passes through the input end ring-shaped sleeve 110, and the input end ring-shaped sleeve 110 is between the input end conical sleeve 109 and the input end sleeve nut 111. When assembling, the image transmission cable 3 passes through the input end sleeve nut 111, the input end ring-shaped sleeve 110, and the input end conical sleeve 109 in sequence.

[0068] As shown in Figure 4 、 Figure 5 , the output end image transmission unit further comprises an output end ring-shaped sleeve 209, which is installed in the output end sleeve nut 210, the end of the image transmission cable 3 passes through the output end ring-shaped sleeve 209, and the output end ring-shaped sleeve 209 is between the output end conical sleeve 208 and the output end sleeve nut 210. When assembling, the image transmission cable 3 passes through the output end sleeve nut 210, the output end ring-shaped sleeve 209, and the output end conical sleeve 208 in sequence.

[0069] The input end annular sleeve 110 and the output end annular sleeve 209 are used to improve the firmness and stability of the connection, prevent the connection from being adversely affected by external torsion or tension, and prevent the input end tapered sleeve 109 and the output end tapered sleeve 208 from being in rigid contact with other parts.

[0070] In another specific embodiment, as shown in Figure 4 , Figure 5 The input end image transfer unit further comprises a holder gasket 103, which is installed in the pigtail outlet lead 101 and is between the optical fiber holder 102 and the input end image transfer light cone 104. By arranging the holder gasket 103, the optical fiber holder 102 and the input end image transfer light cone 104 can be prevented from being in rigid contact and the pressure can be uniformly dispersed.

[0071] As shown in Figure 4 , Figure 5 The output end image transfer unit further comprises an output end image transfer light cone gasket 207, which is installed in the output end external thread hollow nut 206 and is between the output end image transfer light cone 205 and the output end tapered sleeve 208. By arranging the output end image transfer light cone gasket 207, the output end external thread hollow nut 206 and the input end image transfer light cone 104 can be prevented from being in rigid contact and the pressure can be uniformly dispersed.

[0072] In another specific embodiment, the pigtail outlet lead 101 is provided with internal threads and external threads, the input end external thread hollow nut 105 is provided with external threads, and the input end sleeve nut 111 is provided with internal threads; the plug 201 is provided with internal threads and external threads, the output end external thread hollow nut 206 is provided with external threads, and the output end sleeve nut 210 is provided with internal threads.

[0073] The pigtail outlet lead 101 is threadedly connected with the input end external thread hollow nut 105 and the input end sleeve nut 111, respectively; and the plug 201 is threadedly connected with the output end external thread hollow nut 206 and the output end sleeve nut 210, respectively. By means of thread connection, quick and stable connection is achieved.

[0074] The above is only a preferred embodiment of the present application, and does not limit the present application in any form. Any simple modification or equivalent change made on the basis of the technical essence of the present application to the above embodiment falls within the protection scope of the present application.

Claims

1. A method for discrete array light guide signal detection, comprising transmitting the image output by the light guide signal array to an image acquisition and signal processing unit through an image transmission assembly, and using the image acquisition and signal processing unit to collect data, and then performing data analysis and signal calculation, characterized in that: Step S1: preprocessing the discrete light spot array image collected by the image sensor in the image acquisition and signal demodulation unit; Step S2: when all the light spots in the discrete light spot array image are fully bright, positioning all the light spots, establishing a two-dimensional system, and mapping the coordinate values to the light spot distribution position; Step S3: encoding the discrete light guide signal in the light guide signal array one by one through the position information of each light spot in the discrete light spot array image; Step S4: averaging the sum of the gray values of the output light spot in the light guide signal in the bright and dark states, and taking the average value as the threshold value for judging the light guide signal; Step S5: comparing the output light spot gray value corresponding to the light guide signal with the threshold value; when the output light spot gray value is greater than the judgment threshold value, it indicates that the detected object is detected, and when the output light spot gray value is less than the judgment threshold value, it indicates that the detected object is not detected. The preprocessing of the discrete light spot array image in step S1 includes gray processing and filtering processing, and the noise points in the light spot array image are removed. The encoding information in step S3 includes the installation position and measurement information of the light guide signal. The image transmission assembly includes an image transmission cable (3), an image transmission cable input end connector (1) and an image transmission cable output end connector (2) installed at the end of the image transmission cable (3); wherein the light guide signal array is connected with the image transmission cable (3) through the image transmission cable input end connector (1), and the image acquisition and signal processing unit is connected with the image transmission cable (3) through the image transmission cable output end connector (2); the image transmission cable input end connector (1) is used to reduce the image output by the light guide signal, and the image transmission cable output end connector (2) is used to enlarge the image output by the image transmission cable input end connector (1). The image transmission cable input end connector (1) includes an input end shell and an input end image transmission unit installed in the input end shell, the input end shell includes a tail fiber bundle outlet lead-out device (101), an input end external thread hollow nut (105), and an input end sleeve nut (111); the input end image transmission unit includes a fiber holder (102) installed on the tail fiber bundle outlet lead-out device (101) and an input end image transmission light cone (104); one end of the image transmission cable (3) is sleeved on the input end conical sleeve (109) installed in the input end sleeve nut (111); the input end external thread hollow nut (105) limits the fiber holder (102), the input end image transmission light cone (104), and the input end conical sleeve (109) respectively. ​ ​ 2. A method for discrete array optical guide signal detection according to claim 1, characterized in that: ​ 3. A method for discrete array optical guide signal detection according to claim 1, characterized in that: ​ 4. A method for discrete array optical guide signal detection according to any one of claims 1-3, characterized in that: ​ 5. A method for discrete array optical guide signal detection according to claim 4, characterized in that: ​ The image transmission cable output end connector (2) comprises an output end shell and an output end image transmission unit installed in the output end shell, the output end shell comprises a detachable plug (201), an output end outer threaded hollow nut (206) and an output end sleeve nut (210); the output end image transmission unit comprises an output end image transmission light cone (205) installed on the plug (201); the other end of the image transmission cable (3) is sleeved on the output end conical sleeve (208) installed in the plug (201); the output end outer threaded hollow nut (206) limits the output end image transmission light cone (205) and the output end conical sleeve (208) respectively. The image transmission cable (3) is composed of an optical fiber bundle and an optical fiber bundle sheath; the optical fiber bundle comprises a plurality of optical fibers.

6. A method for discrete array optical guide signal detection according to claim 5, wherein: The input end outer threaded hollow nut (105) is installed with an input end anti-light halo glass (107) between the input end image transmission light cone (104) and the input end conical sleeve (109); the plug (201) is installed with an output end anti-light halo glass (203) between the plug (201) and the output end image transmission light cone (205).

7. A method for discrete array optical guide signal detection according to claim 6, characterized in that: The input end outer threaded hollow nut (105) is installed with an input end anti-light halo glass first gasket (106) and an input end anti-light halo glass second gasket (108), which are respectively distributed on both sides of the input end anti-light halo glass (107); the plug (201) is installed with an output end anti-light halo glass first gasket (202) and an output end anti-light halo glass second gasket (204), which are respectively distributed on both sides of the output end image transmission light cone (205).

8. A method for discrete array optical guide signal detection according to claim 5, wherein: The input end sleeve nut (111) is installed with an input end annular sleeve (110), the end of the image transmission cable (3) passes through the input end annular sleeve (110), and the input end annular sleeve (110) is between the input end conical sleeve (109) and the input end sleeve nut (111); the plug (201) is installed with an output end annular sleeve (209), the end of the image transmission cable (3) passes through the output end annular sleeve (209), and the output end annular sleeve (209) is between the output end conical sleeve (208) and the output end sleeve nut (210).

9. A method for discrete array optical guide signal detection according to claim 8, characterized in that: The output end outer threaded hollow nut (206) is installed with an output end image transmission light cone gasket (207) between the output end image transmission light cone (205) and the output end conical sleeve (208); the tail fiber bundle outlet lead wire device (101) is installed with a retainer gasket (103) between the optical fiber retainer (102) and the input end image transmission light cone (104).

10. The method for discrete array optical guide signal detection of claim 5, wherein: The tail fiber bundle outlet lead wire device (101) is respectively screwed with an input end outer thread hollow nut (105) and an input end sleeve nut (111); the plug (201) is respectively screwed with an output end outer thread hollow nut (206) and an output end sleeve nut (210).

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