CN108765916A - A kind of sensor that signal carrier encrypted state is controllable - Google Patents

Abstract

The invention discloses a sensor with a controllable signal carrier encryption state, including a MIC, the MIC is connected with a filter, the filter is connected with an acoustic signal modulation acquisition circuit, and the acoustic signal modulation acquisition circuit modulates the acoustic signal, Convert, collect. The acoustic signal modulation acquisition circuit is connected with the control circuit, and the processor on the control circuit performs data processing on the collected acoustic signal, and performs data analysis, and then verifies and encrypts the data analysis result, and feeds back the result to the host computer. The sensor of the present invention realizes signal transmission encryption by adding a processor, and the state is intelligently controllable; the international general HART protocol is adopted to ensure the compatibility between the sensor and other systems of the power plant; The signal accuracy, reliability, anti-electromagnetic interference and confidentiality tests of the sensor; the working state of the sensor is controllable, which can further extend its service life.

Description

A sensor with controllable signal carrier encryption state

technical field

The invention relates to the technical field of sensors, in particular to a sensor with a controllable signal carrier encryption state.

Background technique

It is an effective and commonly used method to measure the noise of the furnace combustion in the boiler by using the acoustic wave sensor. The real-time online monitoring of the leakage noise of the "four tubes" of the boiler can accurately and timely capture the leakage noise. Provide the signal received by the sensor for spectrum analysis and output 0--6mA signal to the computer control system for further software analysis to check whether there is leakage. Therefore, the signal accuracy, reliability, anti-electromagnetic interference, and confidentiality of the sensor are particularly important.

At present, the acoustic wave sensors used to measure the noise in the furnace on the market all use simple signal collection, and then directly send it to the background of the system - the computer control system after the sound-electric conversion. Moreover, there are many manufacturers producing similar sensors in the market, which causes a mismatch between manufacturers, different types of sensors and different backgrounds, resulting in unreliable and stable operation of the equipment. Since there is no national standard mandatory requirement for this product, all enterprise standards are used.

The general 0-6mA signal is extremely susceptible to electromagnetic interference, resulting in distortion of the transmission signal, and the system cannot determine it accurately. Therefore: a sensor with controllable signal carrier encryption state is very necessary for the stable and reliable operation of the whole system.

Contents of the invention

The present invention aims to solve one of the technical problems in the related art at least to a certain extent. Therefore, an object of the present invention is to provide a sensor with controllable signal carrier encryption state, which can encrypt the signal transmission, has good compatibility, high reliability and high accuracy.

Technical scheme of the present invention is:

A sensor with controllable signal carrier encryption state, comprising:

MIC, the MIC is connected with a filter, the filter is connected with an acoustic signal processor, and the acoustic signal processor encodes, checks and encrypts the acoustic signal;

A processor, the processor is connected with the acoustic signal processor, completes the verification, transformation and processing of the signal, and feeds back the information to the host computer;

The signal processing communication protocol of the above-mentioned processor adopts a three-layer model structure, that is, a physical layer, a data link layer and an application layer.

Preferably, after the filter, FFT is used for software filtering.

Preferably, the filter retains the 200--5000hz current signal after filtering.

Preferably, the transmission medium of the physical layer in the signal processing communication protocol is a twisted-pair coaxial cable.

Preferably, the total line impedance of the twisted-pair coaxial cable is 230-1100Ω.

Preferably, the physical layer of the signal processing communication protocol uses the HART protocol for communication.

Preferably, the data link layer in the signal processing communication protocol uses an automatic repeat request sending mechanism for communication.

Preferably, the application layer in the signal processing communication protocol is a command set, and the command set includes general commands, common commands and special commands.

The beneficial effects of the present invention: by adding a processor, the signal transmission encryption is realized, and the state is intelligently controllable; the international general HART protocol is adopted to ensure the compatibility between the sensor and other systems of the power plant; the signal transmission of the sensor signal output to the control cabinet adopts the carrier mode , to verify the sensor's signal accuracy, reliability, anti-electromagnetic interference and confidentiality tests; the working state of the sensor is controllable, which can further extend its service life.

Description of drawings

The accompanying drawings are used to provide a further understanding of the present invention, and constitute a part of the description, and are used together with the embodiments of the present invention to explain the present invention, and do not constitute a limitation to the present invention. In the attached picture:

Fig. 1 is a kind of signal carrier encryption state controllable sensor whole circuit connection block diagram that the present invention proposes;

Fig. 2 is the frame of concrete working principle of the present invention;

Fig. 3 is a working principle block diagram of the data decoding of the control terminal in the present invention;

Fig. 4 is a block diagram of the processing flow of the processor software in the present invention.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention.

Examples of the described embodiments are shown in the drawings, wherein like or similar reference numerals designate like or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

Referring to Figure 1-3, a sensor with controllable signal carrier encryption state, including:

The sensor is composed of a power supply circuit, a control circuit, and a MIC signal processing circuit. The function of the power supply circuit is to provide various power supply voltages required by the control circuit and the acoustic signal modulation acquisition circuit, and is responsible for providing the HART communication interface between the sensor and the host computer. , power supply interface (see Figure 1), the control circuit is responsible for receiving the command of the host computer, and then controls the sound signal modulation and acquisition circuit according to the command, performs modulation and demodulation of the sound signal, verification, conversion and processing of the signal, and converts the system's real-time The status is sent to the host computer. The control circuit is connected with the power supply circuit and the acoustic signal modulation acquisition circuit through connectors, which are used for signal connection with the acoustic signal modulation acquisition circuit and self-checking control interface, and for transferring its external interface to the power supply circuit. At the same time, the power supply voltage required by the acoustic signal modulation acquisition circuit provided by the power supply circuit is switched through the connector.

MIC, the MIC is connected with a filter, the filter retains the current signal of 200--5000hz after filtering, the filter is connected with an acoustic signal modulation acquisition circuit, and the acoustic signal modulation acquisition circuit modulates and processes the acoustic signal, which is convenient Back-end acquisition and processing, filtering is mainly used to process the original background noise in the furnace and pre-process the high-frequency interference signal that appears in the sensor itself; at the same time, it receives the control command of the control circuit for the self-test circuit.

The sound signal modulation and acquisition circuit modulates and processes the sound signal, which is convenient for the control circuit to collect, process and analyze the sound signal.

The processor is installed on the control circuit and is the core of the control circuit. The control circuit is connected with the acoustic signal modulation acquisition circuit to complete signal data processing, data analysis, result verification and encryption, and feed back the data results to the host computer , the sensor and the host computer adopt half-duplex mode and encryption processing;

The signal processing communication protocol of the processor adopts a three-layer model structure, namely the physical layer, the data link layer and the application layer. HART protocol for communication, that is, the transmission baud rate of digital signals is set to 1200bps, 1200Hz represents logic "0", 2200Hz represents logic "1", and the signal amplitude is 0.5A.

The data link layer in the signal processing communication protocol uses an automatic repeat request sending mechanism for communication.

The application layer in the signal processing communication protocol is a command set, and the command set includes general commands, common commands and special commands.

The above is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto, any person familiar with the technical field within the technical scope disclosed in the present invention, according to the technical solution of the present invention Any equivalent replacement or change of the inventive concepts thereof shall fall within the protection scope of the present invention.

Claims (8)

1. a kind of sensor that signal carrier encrypted state is controllable, which is characterized in that including：Power circuit, control circuit harmony Signal modulation Acquisition Circuit；

The power circuit is electrically connected with control circuit harmony signal modulation Acquisition Circuit, is modulated to control circuit, acoustical signal Acquisition Circuit provides the supply voltage needed for it, and power circuit is equipped with HART communication interface and externally fed interface；

The control circuit and upper mechatronics receive host computer order, and processor are equipped in control circuit and from prosecution Interface processed, the processor are connect with acoustic signal processor, complete the verification, conversion and processing of signal, and are fed back information to Host computer；

The acoustical signal modulation Acquisition Circuit includes MIC and self-checking circuit, and the MIC is connected with filter, and the filter connects It is connected to acoustical signal modulation Acquisition Circuit, the acoustical signal modulation Acquisition Circuit is modulated acoustical signal, converts；

The processing communications protocol of the signal of above-mentioned processor uses three layer model structure, i.e. physical layer, data link layer and application Layer.

2. a kind of sensor that signal carrier encrypted state is controllable according to claim 1, which is characterized in that the filtering Software filtering is carried out using FFT after device.

3. a kind of sensor that signal carrier encrypted state is controllable according to claim 1, which is characterized in that the filtering Retain the current signal of 200--5000hz after the filtering of device.

4. a kind of sensor that signal carrier encrypted state is controllable according to claim 1, which is characterized in that the signal The transmission medium for handling physical layer in communications protocol is multiple twin coaxial cable.

5. a kind of sensor that signal carrier encrypted state is controllable according to claim 4, which is characterized in that the multiple twin The circuit total impedance of coaxial cable is 230-1100 Ω.

6. a kind of sensor that signal carrier encrypted state is controllable according to claim 1, which is characterized in that the signal It is communicated using HART protocol in physical layer in processing communications protocol.

7. a kind of sensor that signal carrier encrypted state is controllable according to claim 1, which is characterized in that the signal Data link layer sends mechanism using automatic repeat request and is communicated in processing communications protocol.

8. a kind of sensor that signal carrier encrypted state is controllable according to claim 1, which is characterized in that the signal It is command set to handle application layer in communications protocol, and the command set includes generic command, normal commands and specific command.