CN110047676B - Coding key, passive coding keyboard, signal decoding system and coding and decoding method - Google Patents
Coding key, passive coding keyboard, signal decoding system and coding and decoding method Download PDFInfo
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- CN110047676B CN110047676B CN201910296867.9A CN201910296867A CN110047676B CN 110047676 B CN110047676 B CN 110047676B CN 201910296867 A CN201910296867 A CN 201910296867A CN 110047676 B CN110047676 B CN 110047676B
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/02—Input arrangements using manually operated switches, e.g. using keyboards or dials
- G06F3/0202—Constructional details or processes of manufacture of the input device
- G06F3/0219—Special purpose keyboards
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/02—Input arrangements using manually operated switches, e.g. using keyboards or dials
- G06F3/023—Arrangements for converting discrete items of information into a coded form, e.g. arrangements for interpreting keyboard generated codes as alphanumeric codes, operand codes or instruction codes
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H13/00—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch
- H01H13/02—Details
- H01H13/12—Movable parts; Contacts mounted thereon
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/25—Arrangements specific to fibre transmission
- H04B10/2589—Bidirectional transmission
- H04B10/25891—Transmission components
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/50—Transmitters
- H04B10/516—Details of coding or modulation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/60—Receivers
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- Input From Keyboards Or The Like (AREA)
Abstract
The invention relates to a fiber grating telegraph technology, which comprises a coding keyboard, a decoding system and a coding and decoding technology thereof, and belongs to a passive emergency communication technology in the field of fiber sensing. The invention relates to a passive coding keyboard based on fiber bragg grating, which comprises a coding key and a temperature sensor, wherein the coding key and the temperature sensor are used for inputting different code words to realize corresponding functions. The invention relates to an information demodulation system for decoding, displaying and communicating, which realizes fixed information display output or complex information display output by decoding. The invention relates to a coding and decoding technology, which comprises a coding method combining time domain information and frequency domain information and decoding output of different types of code word types. The invention has the characteristics of passivity, electromagnetic interference resistance, intrinsic safety and the like, can be used in flammable and explosive environments, and can meet the requirements of emergency communication in key occasions.
Description
Technical Field
The invention relates to the field of optical fiber sensing, in particular to an optical fiber grating telegraph technology comprising a passive coding keyboard, a signal decoding system and a coding and decoding technology.
Background
Coal is the current main energy source in China, and mining areas of the coal are divided into underground coal mines and open pit coal mines. Most areas of China belong to underground coal mines, so that effective personnel communication needs to be kept between the ground and the underground in real time. Communication modes used in mines at present are divided into wired communication and wireless communication. The cable is mainly used as a transmission channel in wired communication, and is generally an intrinsically safe device, but the cable still needs to be powered by a body battery or be powered in a centralized manner, so that certain potential safety hazards exist; the wireless communication utilizes electromagnetic waves to transmit information, but the transmission quality and distance of the wireless communication are influenced by coal, rock stratum electrical parameters, roadway size and shape and metal members, and the wireless communication has defects.
In view of the importance of downhole communications, there is a significant need for a technique that is intrinsically safe and that can provide effective real-time communication and accurate positioning with surface personnel in the event of a power failure downhole and other emergency conditions.
Disclosure of Invention
The invention relates to a fiber grating telegraph technology, which transmits information to a signal decoding system through a sensing optical fiber by a passive coding keyboard and a coding method combining a time domain and a frequency domain, and then correspondingly decodes and outputs the information into corresponding functions or information according to different code systems, can meet the requirement of effective emergency communication in long-distance extreme occasions, and overcomes the defects in the prior art.
The coding key is realized by adopting the following technical scheme: a coding key comprises a key base with an opening at the top, wherein a limiting pad is arranged at the center of the bottom of the key base, a pair of optical fiber through holes are formed in the side wall of the key base, which is close to the bottom, and a stress sensing optical fiber which is in a tensioning state and is connected with the outside at two ends penetrates through the pair of optical fiber through holes; an elastic thin film sheet is fixedly bonded on the upper side of the stress sensing optical fiber, a key supporting beam is respectively fixed on the inner side wall of the key base at the same side with the pair of optical fiber through holes, and the upper parts of the two ends of the elastic thin film sheet are fixedly bonded with the lower parts of the two key supporting beams respectively; the inner part of the key base is also provided with an elastic key positioned above the key supporting beam and the elastic thin film sheet; the two ends of the elastic key extend downwards and are fixedly supported on the upper parts of the two key supporting beams, and the center of the lower part of the elastic key protrudes downwards and is opposite to the middle part of the elastic film sheet; the upper surface of the middle part of the stress sensing optical fiber is carved with a grating, and the central positions of the limiting pad, the grating part of the stress sensing optical fiber and the lower part of the elastic key are positioned on the same vertical line; a movable pressing structure for pressing the elastic key is arranged above the key base.
Furthermore, the movable pressing structure comprises a key cap and a key guide post which are limited in the key base; the key cap comprises a top plate positioned above the opening of the key base and three limiting grooves connected below the top plate; the key guide column comprises a bottom plate and three guide columns connected above the bottom plate; the three guide posts are respectively nested in the three limiting grooves, and the guide post positioned in the middle is mutually bonded and fixed with the corresponding limiting groove; the upper side of the elastic key is fixedly bonded with the lower side of the key guide post.
A pair of middle limiting sections and a pair of side limiting hooks with bottom ends extending outwards horizontally extend downwards from the lower part of a top plate of the key cap, a limiting groove is formed by the adjacent side limiting hooks and the middle limiting sections, and a middle limiting groove is formed between the pair of middle limiting sections; the top of the side wall of the key base is bent inwards to form a stop block, and a position of the top plate of the key cap, which corresponds to the stop block, forms a limit block; the side limit hook is positioned below the stop block, and the limit block is positioned above the stop block.
When encoding the "0" state: the key cap at the upper part of the key is in an upper limit position, and limit hooks at two sides of the key cap are tightly attached to limit blocks at two sides of the key base; the elastic key is in a natural resilience state, and the elastic film sheet and the stress sensing optical fiber bonded with the elastic film sheet are in an initial horizontal state;
when encoding the "1" state: the key cap at the upper part of the key is in a lower limit position, and the limit blocks at the two sides of the key cap are tightly attached to the limit blocks at the two sides of the key base; the elastic key is in a downward pressed state, the elastic film sheet and the stress sensing optical fiber bonded with the elastic film sheet are in a downward pressed state, and the lowest pressed position is the upper surface of the limiting pad.
The passive coding keyboard is realized by adopting the following technical scheme: a passive coding keyboard comprises a plurality of at least one coding key and a temperature sensor which are connected in series or in parallel; when the keyboard is connected in series, the coding keys are reasonably installed in the keyboard in sequence according to the direction of the tail end of the optical fiber, and coding information is sensed by the single-path optical fiber; when the keyboard is connected in a parallel mode, the coding keys are arranged in parallel in the keyboard according to different paths in the tail end direction of the optical fiber, and coding information is sensed by multiple paths of optical fibers; the temperature sensor is a fiber bragg grating temperature sensor, is arranged on one side of a key area in the keyboard and is used for sensing by a single-path optical fiber; the optical fiber between the coding keys and the optical fiber of the temperature sensor are both in an unstressed state, and the optical fiber between the coding keys is left with a proper length.
The invention relates to a signal decoding system which comprises a scanning laser, wherein the output of the scanning laser is sequentially connected with an optical isolator and the input end of a 1 × n optical fiber coupler, two output ends of a 1 × n optical fiber coupler are respectively connected with a pin 1 of a first optical circulator and a pin 1 of a second optical circulator, pins 3 of the first optical circulator and the second optical circulator are respectively connected with a first photoelectric detector and a second photoelectric detector, the outputs of the first photoelectric detector and the second photoelectric detector are respectively connected with a first signal conditioning module and a second signal conditioning module, the outputs of the first signal conditioning module and the second signal conditioning module are jointly connected with an A/D conversion module, the output of the A/D conversion module is connected with an MCU/MPU module, the output of the MCU/MPU module is sent to a computer for processing, the trigger signal output end of the scanning laser is connected with the trigger signal input end of the MCU/MPU module, and the pins 2 of the first optical circulator and the second optical circulator are respectively communicated with a code of a key and a temperature sensor.
The invention relates to a fiber grating telegraph coding and decoding method, which is realized by adopting the following technical scheme: a fiber grating telegraph code decoding method, adopt the signal decoding system to realize decoding, display, communication; according to different requirements, fixed information coding and decoding or complex information coding and decoding can be realized, and the steps are as follows:
(1) an initial state of a coding and decoding system, comprising:
(1.1) reading the key state of the passive coding keyboard, specifically demodulating the central wavelength reflected by the fiber bragg grating in each key;
(1.2) demodulating the reflection center wavelength of a fiber grating temperature sensor of the passive coding keyboard, and calibrating the key state according to the temperature parameter and the grating reference wavelength in the key;
(1.3) setting a threshold value for the '0' state of the key code according to the initial state; setting a threshold value of the state of the key code '1' according to the wavelength drift amount corresponding to the key limiting height;
and (1.4) keeping the system in a standby state according to real-time calibration and threshold setting.
(2) An encoding state comprising:
(2.1) before starting coding, sending a starting check signal to enable a decoding system to start storing a coded signal;
(2.2) before sending the coding content, sending code length parameter setting information according to the configuration condition of the passive coding keyboard (22);
(2.3) sending the coded content, and performing pressing operation according to the corresponding key with the code element of '1' in the code word, wherein the corresponding key with the code element of '0' does not perform operation;
and (2.4) after the coding is finished, sending a stop check signal, and finishing the storage of the coded signal by the system.
(3) Decoding state, comprising:
(3.1) signal preprocessing, specifically, filtering and fitting the signal output by the passive coding keyboard;
(3.2) converting the wavelength signal change condition of each key state in the passive coding keyboard into a wavelength-digital signal according to a set threshold, and expressing the key state by 0 and 1;
(3.3) according to the set code length parameter, carrying out code word identification on the converted signal according to a corresponding decoding table;
and (3.4) correspondingly decoding the received different code words according to different requirements and outputting the decoded code words into fixed signals or other complex communication signals.
The invention relates to a fiber grating telegraph technology, which transmits different code words by a passive coding keyboard and a signal decoding system thereof through a coding method combining a time domain and a frequency domain, and the signal decoding system decodes and outputs the code words according to different formats to realize the display and output of fixed information or complex information. Its advantages are as follows:
the invention adopts the optical fiber sensing technology, realizes passive coding output through keys based on the optical fiber grating, has the characteristics of being passive, resisting electromagnetic interference and the like, can be used in flammable and explosive environments, has intrinsic safety, high reliability and good real-time performance, can realize effective communication and positioning functions under long-distance conditions, and has huge application potential in the communication aspect of special occasions such as underground coal mines and the like.
Drawings
FIG. 1 is a schematic diagram of a "0" state of a fiber grating-based encoded key according to the present invention.
FIG. 2 is a schematic view of a state of a fiber grating-based coding key 1 according to the present invention.
Fig. 3 is a schematic structural diagram of a coded keyboard key and a temperature sensor based on fiber bragg grating according to the present invention.
FIG. 4 is a single-channel structure diagram of an encoding keyboard and signal decoding system of the present invention.
Fig. 5 is a schematic block diagram of a coding and decoding technique of the present invention.
The device comprises a key cap 1, a key cap 2, a key guide column 3, an elastic key 4, an elastic film sheet 5, a stress sensing optical fiber 6, an optical fiber through hole 7, a key support beam 8, a key base 9, a limiting pad 10, a scanning laser 11, an optical isolator 12, a 1 × n optical fiber coupler 13, a first optical fiber circulator 14, a second optical fiber circulator 15, a first photoelectric detector 16, a second photoelectric detector 17, a first signal conditioning module 18, a second signal conditioning module 19, an A/D conversion module 20, an MCU/MPU module 21, a computer 22, a passive coding keyboard 23, a coding key 24 and a temperature sensor.
Detailed Description
The fiber grating telegraph technology is mainly based on the fiber sensing technology, has the advantages of long-distance and passive transmission, has intrinsic safety because the coding keyboard and the transmission both use the fiber as media, and can meet the requirements of effective real-time communication and accurate positioning with ground personnel in the case of underground power supply failure or other emergency conditions.
The key cap 1, the key guide post 2, the optical fiber through hole 6, the key base 8 and the limiting pad 9 are generally made of plastics or other similar materials, the elastic key 3 and the elastic film sheet 4 are made of silica gel or other elastic materials with stronger rebound resilience, the stress sensing optical fiber 5 is a common single-mode optical fiber, and the key supporting beam 7 is made of metal, plastics or other materials with better supporting property and bonding property.
Example 1
As shown in fig. 1, which is a schematic diagram of a "0" state of the fiber grating-based encoded key of the present invention, a key cap 1 and a key guide post 2 are fixed by bonding the middle post of the key cap and the key guide post up and down, and the middle post and the two side posts of the guide post are respectively matched with three guide grooves of the key cap 1 above; the upper side of the elastic key 3 is fixedly bonded with the lower side of the key guide column 2, and the two sides of the elastic key are respectively fixed with the upper parts of key supporting beams 7 fixed on the two sides of a key base 8; two ends of the elastic film sheet 4 are respectively bonded and fixed with the lower parts of the key supporting beams 7 fixed on two sides of the key base 8; the stress sensing optical fiber 5 is fixedly bonded with the upper elastic film sheet 4, two sides of the sensing optical fiber are connected with the outside through optical fiber through holes 6 on two sides of a key base 8, the stress sensing optical fiber 5 in the key is in a tensioning state, and the part engraved with the grating is positioned in the middle; the limit pad 9 is fixedly bonded with the middle position of the key base 8. The key cap 1 at the upper part of the key is positioned at an upper limit position, and limit hooks at two sides of the key cap 1 are clung to limit blocks at two sides of the key base 8; the elastic key 3 is in a natural rebound state, the elastic film sheet 4 and the stress sensing optical fiber 5 bonded with the elastic film sheet are in an initial horizontal state, and the central positions of the limiting pad 9 and the grating part of the stress sensing optical fiber 5 and the lower part of the elastic key 3 are in the same vertical line.
Example 2
As shown in fig. 2, which is a schematic view of the state of "1" of the fiber grating-based encoded key of the present invention, a key cap 1 and a key guide post 2 are fixed by bonding the middle post of the key cap and the key guide post up and down, and the middle post and the two side posts of the guide post are respectively matched with three guide grooves of the key cap 1 above; the upper side of the elastic key 3 is fixedly bonded with the lower side of the key guide column 2, and the two sides of the elastic key are respectively fixed with the upper parts of key supporting beams 7 fixed on the two sides of a key base 8; two ends of the elastic film sheet 4 are respectively bonded and fixed with the lower parts of the key supporting beams 7 fixed on two sides of the key base 8; the stress sensing optical fiber 5 is fixedly bonded with the upper elastic film sheet 4, two sides of the stress sensing optical fiber are connected with the outside through optical fiber through holes 6 on two sides of a key base 8, the stress sensing optical fiber in the key is in a tensioning state, and the part engraved with the grating is positioned in the middle; the limit pad 9 is fixedly bonded with the middle position of the key base 8. The key cap 1 at the upper part of the key is positioned at a lower limit position, and the limit blocks at two sides of the key cap 1 are clung to the stop blocks at two sides of the key base 8; the elastic key 3 is in a downward pressed state, the elastic film sheet 4 and the stress sensing optical fiber 5 bonded with the elastic film sheet are in a downward pressed state, the lowest pressed position is the upper surface of the limiting pad 9, and the limiting pad 9, the grating part of the stress sensing optical fiber 5 and the center position of the lower part of the elastic key 3 are in the same vertical line.
Example 3
The optical fiber temperature coding and coding system comprises a first optical circulator and a second optical circulator, wherein the first optical circulator and the second optical circulator are connected in parallel, the output ends of the first optical circulator and the second optical circulator are respectively connected with a first optical circulator 13 and a second optical circulator 14, the 3 pins of the first optical circulator 13 and the second optical circulator 14 are respectively connected with a first photoelectric detector 15 and a second photoelectric detector 16, the output ends of the first photoelectric detector 15 and the second photoelectric detector 16 are respectively connected with a first conditioning signal module 17 and a second signal conditioning module 18, the output ends of the first signal conditioning module 17 and the second signal conditioning module 18 are respectively connected with an A/D conversion module 19, the A/D conversion module 19 is connected with an MCU/MPU (micro controller unit/microprocessor unit) 20, the output ends of the first optical circulator and the second optical circulator are respectively connected with a key module 18, the first signal conditioning module 17 and the second optical circulator 17 are respectively connected with the A/D conversion module 19, the A/D conversion module 19 is connected with a keyboard/MPU (keyboard) 20, the keyboard 3, the keyboard is connected with a keyboard 3, the keyboard 18, the keyboard is connected with a plurality of optical fiber coding and a first optical fiber temperature coding and a first optical circulator, the first optical circulator, the optical circulator 22 are connected with a plurality of the first optical circulator, the first optical circulator, the optical circulator and the second optical circulator, the optical circulator are connected with the optical circulator, the optical fiber temperature coding circulator, the optical fiber coding circulator is connected with the first optical circulator, the optical circulator is connected with the optical circulator, the optical fiber is connected with the optical fiber coding module, the optical fiber temperature coding module, the optical fiber coding module, the optical circulator, the optical fiber is connected with the optical circulator, the optical fiber is connected with the optical fiber coding module, the optical circulator is connected with the optical fiber is connected with the optical circulator, the optical fiber temperature coding module, the optical fiber coding module is connected with the optical fiber coding module, the optical fiber is connected with the optical fiber coding module, the optical fiber coding module is connected with the optical fiber coding module, the optical circulator, the.
Example 4
Fig. 5 is a schematic block diagram of a coding technique based on a coding keyboard and a decoding system. When the power supply system is broken down or other emergency situations happen underground, the ground monitoring room starts the signal decoding system to carry out communication. The method comprises the following specific steps:
(1) an initial state of a coding and decoding system, comprising:
(1.1) the MCU/MPU module reads the key state of the coding keyboard, specifically, demodulates the central wavelength of the fiber grating reflection in each key;
(1.2) the MCU/MPU module demodulates the reflection center wavelength of the fiber grating temperature sensor of the keyboard and calibrates the key state according to the temperature parameter and the grating reference wavelength in the key;
(1.3) setting a threshold value for the '0' state of the key code according to the initial state; setting a threshold value of the state of the key code '1' according to the wavelength drift amount corresponding to the key limiting height;
and (1.4) keeping the system in a standby state according to real-time calibration and threshold setting.
(2) An encoding state comprising:
(2.1) before coding is started, manually sending a starting verification signal by pressing a fixed key to enable a decoding system to start storing a coding signal;
(2.2) before sending the coded content, sending code length parameter setting information according to the keyboard configuration condition;
(2.3) sending the coded content, and performing pressing operation according to the corresponding key with the code element of '1' in the code word, wherein the corresponding key with the code element of '0' does not perform operation;
and (2.4) after the coding is finished, sending a stop check signal, and finishing the storage of the coded signal by the system.
(3) Decoding state, comprising:
(3.1) signal preprocessing, specifically, filtering and fitting signals output by a keyboard;
(3.2) converting the wavelength signal change condition of each key state in the coding keyboard into a wavelength-digital signal according to a set threshold, and expressing the key state by 0 and 1;
(3.3) according to the set code length parameter, carrying out code word identification on the converted signal according to a corresponding decoding table;
and (3.4) correspondingly decoding the received different code words according to different requirements and outputting the decoded code words into fixed signals or other complex communication signals.
Claims (1)
1. A fiber grating telegraph coding and decoding method adopts a signal decoding system to realize decoding, displaying and communication, wherein the signal decoding system comprises a scanning laser (10), the output of the scanning laser (10) is sequentially connected with an optical isolator (11) and the input end of a 1 × n optical fiber coupler (12), the output end of the 1 × n optical fiber coupler (12) is respectively connected with the 1 pin of a first optical circulator (13) and the 1 pin of a second optical circulator (14), the 3 pins of the first optical circulator (13) and the second optical circulator (14) are respectively connected with a first photoelectric detector (15) and a second photoelectric detector (16), the outputs of the first photoelectric detector (15) and the second photoelectric detector (16) are respectively connected with a first signal conditioning module (17) and a second signal conditioning module (18), the outputs of the first signal conditioning module (17) and the second signal conditioning module (18) are jointly connected with an A/D conversion module (19), the output of the A/D conversion module (19) is connected with a keyboard/MCU (20), the output end of the first signal conditioning module (17) and the output end of the second signal conditioning module (14) are respectively connected with a keyboard/MCU (20), and the output end of the MCU (20) is connected with a passive optical circulator (14) for triggering a keyboard/MCU (20) for triggering a laser coding and a temperature calculation module (20) for carrying out a calculation;
the passive coding keyboard (22) comprises a plurality of at least one coding key (23) and a temperature sensor (24) which are connected in series or in parallel; when the keyboard is connected in series, the coding keys (23) are reasonably installed in the keyboard in sequence according to the direction of the tail end of the optical fiber, and coding information is sensed by the single-path optical fiber; when the keyboard is connected in a parallel mode, the coding keys (23) are arranged in parallel in the keyboard according to different paths according to the tail end direction of the optical fiber, and coding information is sensed by multiple paths of optical fibers; the temperature sensor (24) is a fiber bragg grating temperature sensor, is arranged on one side of a key area in the keyboard and is used for sensing by a single-path optical fiber; the optical fibers between the coding keys (23) and the optical fibers of the temperature sensor (24) are in an unstressed state, and the optical fibers between the coding keys (23) are left with proper lengths;
the coding key (23) comprises a key base (8) with an opening at the top, a limiting pad (9) is arranged at the center of the bottom of the key base (8), a pair of optical fiber through holes (6) are formed in the side wall of the key base (8) close to the bottom, and stress sensing optical fibers (5) which are in a tensioning state and are connected with the outside at two ends are arranged through the pair of optical fiber through holes (6); an elastic film sheet (4) is fixedly bonded on the upper side of the stress sensing optical fiber (5), a key supporting beam (7) is respectively fixed on the inner side wall of the key base (8) at the same side with the pair of optical fiber through holes (6), and the upper parts of the two ends of the elastic film sheet (4) are fixedly bonded with the lower parts of the two key supporting beams (7) respectively; the interior of the key base (8) is also provided with an elastic key (3) which is positioned above the key supporting beam (7) and the elastic film sheet (4); two ends of the elastic key (3) extend downwards and are fixedly supported at the upper parts of the two key supporting beams (7), and the center of the lower part of the elastic key (3) protrudes downwards and is opposite to the middle part of the elastic film sheet (4); the upper surface of the middle part of the stress sensing optical fiber (5) is carved with a grating, and the limiting pad (9), the grating part of the stress sensing optical fiber (5) and the center position of the lower part of the elastic key (3) are positioned on the same vertical line; a movable pressing structure for pressing the elastic key (3) is arranged above the key base (8);
the method is characterized in that fixed information coding and decoding or complex information coding and decoding can be realized according to different requirements, and the method comprises the following steps:
(1) an initial state of a coding and decoding system, comprising:
(1.1) reading the key state of a passive coding keyboard (22), specifically demodulating the central wavelength reflected by the fiber bragg grating in each key;
(1.2) demodulating the reflection center wavelength of a fiber grating temperature sensor of a passive coding keyboard (22), and calibrating the state of a key according to temperature parameters and the reference wavelength of a grating in the key;
(1.3) setting a threshold value for the '0' state of the key code according to the initial state; setting a threshold value of the state of the key code '1' according to the wavelength drift amount corresponding to the key limiting height;
(1.4) keeping the system in a standby state according to real-time calibration and threshold setting;
(2) an encoding state comprising:
(2.1) before starting coding, sending a starting check signal to enable a decoding system to start storing a coded signal;
(2.2) before sending the coding content, sending code length parameter setting information according to the configuration condition of the passive coding keyboard (22);
(2.3) sending the coded content, and performing pressing operation according to the corresponding key with the code element of '1' in the code word, wherein the corresponding key with the code element of '0' does not perform operation;
(2.4) after the coding is finished, sending a check stopping signal, and finishing the storage of the coded signal by the system;
(3) decoding state, comprising:
(3.1) signal preprocessing, specifically, filtering and fitting the signal output by the passive coding keyboard (22);
(3.2) converting the wavelength signal change condition of each key state in the passive coding keyboard (22) according to a set threshold value to a digital signal, and expressing the key states by '0' and '1';
(3.3) according to the set code length parameter, carrying out code word identification on the converted signal according to a corresponding decoding table;
and (3.4) correspondingly decoding the received different code words according to different requirements and outputting the decoded code words into fixed signals or other complex communication signals.
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