CN103776563A - Fiber point-mode temperature measuring system with wireless networking function - Google Patents

Abstract

An optical fiber point-type temperature measurement system with a wireless networking function, which includes a temperature measurement module, an optical signal acquisition and processing module, and a wireless transmission module; the temperature measurement module is connected to the optical signal acquisition and processing module, and the measurement The temperature module transmits the measured optical signal to the optical signal acquisition and processing module, and the optical signal acquisition and processing module converts the optical signal to obtain temperature data and sends it to the wireless transmission module. The module sends out the temperature data. The temperature measurement module provided by the invention adopts optical fiber as the main structure, which has the advantages of anti-electromagnetic interference, anti-corrosion, explosion-proof, and lightning strike. It eliminates the trouble of laying wires and facilitates wireless networking.

Description

An optical fiber point temperature measurement system with wireless networking function

technical field

The invention belongs to the technical field of optical fiber sensing, in particular to an optical fiber point-type temperature measurement system with wireless networking function.

Background technique

The internal metal connectors of high-voltage power equipment such as power switch cabinets, circuit breakers, frequency converters, and GIS are prone to poor contact and abnormal plug-in eccentricity. This will cause the contact resistance to be too large, and the heat will be serious under high current. failure, destroying the safety and reliability of power supply. Therefore, real-time temperature monitoring of the contact head, timely detection of hot spots in the switch cabinet, and early prediction and alarm of faults are extremely important for ensuring the safety of life and property.

At present, there are two main temperature measurement technologies in high-voltage power equipment: active temperature measurement technology (typical examples are wireless temperature measurement technology and infrared temperature measurement technology), and passive temperature measurement technology (typical example is optical fiber temperature measurement). Both have their flaws. Among them, the active temperature measurement technology uses electronic sensors as the on-site sensing unit. The on-site sensor is charged and is easily affected by strong magnetic field and high voltage. It is pure optical fiber temperature measurement technology, which is resistant to electromagnetic interference and is not easy to age. However, due to the use of optical fiber structure during transmission, it needs to be buried underground and laying optical cables, which undoubtedly increases labor costs.

Contents of the invention

An optical fiber point-type temperature measurement system with wireless networking function, which includes a temperature measurement module, an optical signal acquisition and processing module, and a wireless transmission module;

The temperature measurement module is connected to the optical signal acquisition and processing module, and the temperature measurement module transmits the measured optical signal to the optical signal acquisition and processing module, and the optical signal acquisition and processing module processes the optical signal The temperature data obtained after conversion processing is sent to the wireless transmitting module, and the wireless transmitting module sends the temperature data out.

Preferably, the temperature measurement module includes a temperature measurement probe, the temperature measurement probe includes an optical fiber, and the optical fiber uniformly coats the semiconductor material on its axial cross-sectional end surface by coating technology.

Preferably, the optical fiber coated with semiconductor film is encapsulated by ceramic tube and aviation glue.

Preferably, the optical signal acquisition and processing module includes an optical signal acquisition board, a transimpedance amplifier circuit, a program-controlled amplifier circuit, an AD converter, and a first ARM processor, and the program-controlled amplifier circuit communicates with the first ARM processor through a digital potentiometer. An ARM processor is connected, and the first ARM processor is connected with the AD converter at the same time, and the optical signal acquisition board, the transimpedance amplifier circuit, the program-controlled amplifier circuit, and the AD converter are connected in sequence.

Preferably, the transimpedance amplifying circuit includes a PIN receiving tube and an amplifier, the program-controlled amplifier includes an operational amplifier, and the operational amplifier adopts the same phase proportional input mode, the digital potentiometer has a TWI interface, and the first The ARM processor is connected to the digital potentiometer through the TWI interface, and controls the amplification factor of the operational amplifier through the digital potentiometer.

Preferably, the program-controlled amplifier outputs a signal to the AD converter, and sends the signal to the wireless transmitting module through the communication interface of the first ARM processor.

Preferably, the first ARM processor is STM32, and the communication interface is RS485.

Preferably, the wireless transmission module includes an RS485 interface, a second ARM processor and a wireless transmission interface, the RS485 interface receives the temperature data sent by the optical signal acquisition and processing module, and the temperature data is sent by the second ARM processor After being cached, it is sent to the wireless transmission interface.

Preferably, it also includes a wireless receiver, the wireless receiver includes a Zigbee and an intelligent terminal, and the Zigbee communicates with the intelligent terminal.

The temperature measurement module provided by the present invention adopts optical fiber as the main structure, and adopts the coating technology of semiconductor material and the packaging technology of optical fiber ceramic tube and aviation glue. It has the advantages of anti-electromagnetic interference, anti-corrosion, explosion-proof, and lightning strike. equipment and other harsh environments; and the present invention uses a wireless transmitter to transmit the collected temperature data in a wireless manner, which not only saves the trouble of laying wires, but also facilitates wireless networking, greatly improving the system The flexibility is also convenient for construction.

Of course, any product implementing the present invention does not necessarily need to achieve all the above-mentioned advantages at the same time.

Description of drawings

Fig. 1 is a structural diagram of an optical fiber point-type temperature measurement system with a wireless networking function provided by an embodiment of the present invention;

FIG. 2 is a schematic structural diagram of an optical signal acquisition and processing module provided by an embodiment of the present invention.

specific embodiment

An embodiment of the present invention provides an optical fiber point-type temperature measurement system with a wireless networking function, which includes a temperature measurement module, an optical signal acquisition and processing module, and a wireless transmission module;

The temperature measurement module is connected to the optical signal acquisition and processing module, and the temperature measurement module transmits the measured optical signal to the optical signal acquisition and processing module, and the optical signal acquisition and processing module processes the optical signal The temperature data obtained after conversion processing is sent to the wireless transmitting module, and the wireless transmitting module sends the temperature data out.

The temperature measurement module includes a temperature measurement probe. The temperature measurement probe uniformly coats the semiconductor material on the axial cross-sectional end surface of the optical fiber through the coating technology, and then encapsulates the optical fiber coated with the semiconductor film through the ceramic tube and aviation glue. Formed, the temperature measuring probe and the optical signal acquisition board are connected through an optical fiber. The optical fiber used for this connection is made of high temperature resistant polytetrafluoroethylene material. One end of the optical fiber is an LC connector to connect the probe; the other end is an SC connector. Plug into the optical signal acquisition board.

As shown in Figure 2, the optical signal acquisition and processing module includes an optical signal acquisition board, a transimpedance amplifier circuit, a program-controlled amplifier circuit, an AD converter, and a first ARM processor, and the program-controlled amplifier circuit communicates with the said program-controlled amplifier circuit through a digital potentiometer. The first ARM processor is connected, and the first ARM processor is connected to the AD converter at the same time, and the optical signal acquisition board, the transimpedance amplifier circuit, the program-controlled amplifier circuit, and the AD converter are connected in sequence.

The optical signal acquisition board is used to receive the optical signal from the temperature measuring probe, the transimpedance amplifying circuit includes a PIN receiving tube and an amplifier, the program-controlled amplifier includes a high-precision operational amplifier, and the high-precision operational amplifier adopts a In the way of proportional input, the digital potentiometer has a TWI interface, and the first ARM processor is connected to the digital potentiometer through the TWI interface, and controls the magnification of the operational amplifier through the digital potentiometer. In the embodiment, the magnification varies from 1 to 256 times.

In this embodiment, the program-controlled amplifier outputs a signal to the AD converter, and sends the signal to the wireless transmitting module through the communication interface through the first ARM processor; the first ARM processor is STM32, and the communication The interface is RS485.

The wireless transmission module includes an RS485 interface, a second ARM processor and a wireless transmission interface, the RS485 interface receives the temperature data sent by the optical signal acquisition and processing module, and the temperature data is cached by the second ARM processor and then sent to As for the wireless transmission interface, the second ARM processor is STM32.

The wireless transmitting interface is connected with a wireless transmitting device Zigbee.

Embodiment two

As shown in Figure 1, an embodiment of the present invention provides an optical fiber point temperature measurement system with a wireless networking function, which includes a temperature measurement module, an optical signal acquisition and processing module, and a wireless transmission module;

The temperature measurement module is connected to the optical signal acquisition and processing module, and the temperature measurement module transmits the measured optical signal to the optical signal acquisition and processing module, and the optical signal acquisition and processing module processes the optical signal The temperature data obtained after conversion processing is sent to the wireless transmission module, and the wireless transmission module sends the temperature data;

It also includes a wireless receiver, the wireless receiver includes a Zigbee and an intelligent terminal, and the Zigbee communicates with the intelligent terminal.

The specific working process of an optical fiber point-type temperature measurement system with wireless networking function provided by Embodiment 2 is as follows:

Attach one end of the temperature measuring probe to the metal joint, and insert the other end to the optical signal acquisition board through the optical fiber SC connector. Determine the number of probes and the number of optical signal acquisition boards according to the number of measured points. There are three temperature measurement probes connected to one acquisition board. probe.

The semiconductor material of the temperature measuring probe will change its refractive index when it encounters temperature, and these changes will establish a one-to-one mapping relationship with the temperature. The light emitted by the laser passes through the semiconductor material and the returned optical signal carries temperature information. When the optical signal receiving board receives the optical signal, it first converts the optical signal into an electrical signal through the PIN receiving tube, and then amplifies the signal through the transimpedance amplifier circuit, and performs impedance transformation at the same time. The signal amplified for the first time is further amplified by the program-controlled amplifier to achieve the voltage required for AD conversion. The program-controlled amplifier circuit has a piece of high-precision operational amplifier, which adopts the same phase ratio input method, the gain resistor is fixed, and the feedback resistor is controlled by a digital potentiometer. The digital potentiometer has a TWI interface and is connected to the ARM processor. The ARM processor controls the digital potentiometer through the TWI interface to make the magnification change between 1 and 256 times, adjust the appropriate voltage, and input it to the next-level AD converter. The temperature data collected by AD is handed over to ARM, and ARM transmits the temperature data to the wireless transmitting module through the communication interface.

The ARM processor in the wireless transmitting module receives the temperature data collected by the optical signal acquisition board through the RS485 interface, then caches it, and then waits for the request upload signal transmitted by the PC in the wireless receiver. After receiving the upload signal, the ARM processor transmits the temperature data in the cache through the Zigbee wireless transmission module, and at the same time, the wireless receiving end receives the wireless temperature data transmitted by Zigbee, and sends it to the host computer through the communication mode of the serial port, that is, PC. At the same time, the temperature data and alarm data collected by the optical signal acquisition part are uploaded together when the PC sends a request. The alarm data is stored in the ferroelectric memory of the lower computer.

The temperature measurement module provided by the present invention adopts optical fiber as the main structure, and adopts the coating technology of semiconductor material and the packaging technology of optical fiber ceramic tube and aviation glue. It has the advantages of anti-electromagnetic interference, anti-corrosion, explosion-proof, and lightning strike. equipment and other harsh environments; and the present invention uses a wireless transmitter to transmit the collected temperature data in a wireless manner, which not only saves the trouble of laying wires, but also facilitates wireless networking, greatly improving the system The flexibility is also convenient for construction.

The preferred embodiments of the invention disclosed above are only to help illustrate the invention. The preferred embodiments are not exhaustive in all detail, nor are the inventions limited to specific embodiments described. Obviously, many modifications and variations can be made based on the contents of this specification. This description selects and specifically describes these embodiments in order to better explain the principle and practical application of the present invention, so that those skilled in the art can well understand and utilize the present invention. The invention is to be limited only by the claims, along with their full scope and equivalents.

Claims (10)

1. with an optical fiber point type temp measuring system for wireless networking function, it is characterized in that, comprise temperature measurement module, light signal collection processing module and wireless transmitter module;

Described temperature measurement module is connected with described light signal collection processing module, described temperature measurement module sends the light signal recording to described light signal collection processing module, described light signal collection processing module obtains temperature data and described temperature data is sent to described wireless transmitter module after conversion process by described light signal is carried out, and described wireless transmitter module sends described temperature data.

2. the optical fiber point type temp measuring system with wireless networking as claimed in claim 1, it is characterized in that, described temperature measurement module comprises a temperature probe, and described temperature probe comprises an optical fiber, and described optical fiber is evenly plated in semiconductor material on its axial transversal end face by coating technique.

3. the optical fiber point type temp measuring system with wireless networking as claimed in claim 2, is characterized in that, the described optical fiber that has plated semiconductor film is through ceramic pipe and aviation rubber seal dress.

4. the optical fiber point type temp measuring system with wireless networking as claimed in claim 1, it is characterized in that, described light signal collection processing module comprises light signal collection plate, across resistance amplifying circuit, programmable amplifying circuit, AD converter and the first arm processor, described programmable amplifying circuit is connected with described the first arm processor by a digital regulation resistance, described the first arm processor is connected with described AD converter simultaneously, described light signal collection plate, connects successively across hindering amplifying circuit, programmable amplifying circuit, AD converter.

5. the optical fiber point type temp measuring system with wireless networking as claimed in claim 4, it is characterized in that, described across resistance amplifying circuit comprise PIN receiving tube and amplifier, described programmable amplifier comprises an operational amplifier, described operational amplifier adopts the mode of in-phase proportion input, described digital regulation resistance has TWI interface, and described the first arm processor connects described digital regulation resistance by TWI interface, and by described digital regulation resistance, the enlargement factor of described operational amplifier is controlled.

6. the optical fiber point type temp measuring system with wireless networking as claimed in claim 5, is characterized in that, described programmable amplifier outputs signal to described AD converter, and is sent to described wireless transmitter module by the communication interface of described the first arm processor.

7. the optical fiber point type temp measuring system with wireless networking as claimed in claim 6, is characterized in that, described the first arm processor is STM32, and described communication interface is RS485.

8. the optical fiber point type temp measuring system with wireless networking as claimed in claim 7, it is characterized in that, described wireless transmitter module comprises RS485 interface, the second arm processor and wireless transmit interface, the temperature data that described RS485 interface receiving optical signals acquisition processing module sends, transfers to described the second arm processor after temperature data buffer memory, to be sent to described wireless transmit interface.

9. the optical fiber point type temp measuring system with wireless networking as claimed in claim 8, is characterized in that, is connected with wireless transmit device Zigbee on described wireless transmit interface.

10. the optical fiber point type temp measuring system with wireless networking as described in any one in claim 1-9, it is characterized in that, it also comprises a wireless receiver, and described wireless receiver comprises a Zigbee and an intelligent terminal, described Zigbee and the communication connection of described intelligent terminal.

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