CN102706457A - Infrared temperature measuring device based on ultrasound ranging temperature compensation - Google Patents

Abstract

The invention relates to an infrared temperature measuring device based on ultrasonic ranging temperature compensation. The mechanical structure of the platform is equipped with horizontal and vertical stepping motors, an infrared temperature measuring unit, an ultrasonic ranging module, a laser pointer, and a positioning switch; The mechanical structure of the pan/tilt is connected with the control system and the calibration module through the laser pointer. The calibration parameter storage module, the control system and the calibration module, the system positioning interface circuit and the ultrasonic distance measurement module are respectively connected with the CPU. The infrared temperature measurement unit will measure the temperature The value signal is transmitted to the CPU, and the CPU transmits it to the host computer through the wireless communication interface module. The invention can carry out non-contact online temperature measurement on the points to be measured distributed in various positions in the space, with high precision and fast measurement speed; the structure design is reasonable, and the infrared thermometer is combined with the precise positioning technology to realize the online multi-point temperature in space. Monitoring saves costs.

Description

Infrared Temperature Measuring Device Based on Ultrasonic Ranging and Temperature Compensation

technical field

The invention relates to an infrared temperature measuring device in electric power equipment, in particular to an infrared temperature measuring device for non-contact online ultrasonic distance measurement and temperature compensation.

Background technique

Temperature is a physical quantity that indicates the intensity of molecular motion inside an object, and is one of the important parameters to determine the state of matter of an object. In the power system, most electrical equipments operate under the condition of high voltage and high current. In many power outage accidents, power outages and maintenance often occur due to local overheating of equipment. This not only affects the safe operation of the equipment and threatens public safety, but also brings significant economic losses to the power supply side. If early warning and quick measures can be taken in the early stage of the accident, it will be able to effectively avoid the occurrence of such accidents. Therefore, timely on-line temperature monitoring and control of various connection points of high-voltage live equipment is an important guarantee for the safe operation of the power grid.

At present, for the temperature measurement of high-voltage live equipment, a commonly used method is to paste wax sheets that change color with temperature changes on the measured points that are still used by various power grids, and infer the contact point according to the color change and melting degree of the wax sheets Temperature, this method mainly relies on people's sensory awareness and practical experience to simply judge, the accuracy is low, and real-time monitoring cannot be carried out; the other is to use a thermistor as a temperature measuring element to form a temperature sensor. As far as the wax sheet is concerned, the accuracy has been improved, but the installation process is cumbersome, and it needs to be installed at each temperature measurement place, and online monitoring cannot be implemented.

Contents of the invention

The present invention is to provide an infrared temperature measuring device based on ultrasonic distance measurement and temperature compensation. The device can not only solve the technical problem of real-time monitoring, but also aim at the infrared temperature measurement process. There is an error in the distance of the point to be measured. Ultrasonic ranging technology is used to obtain the distance from the measured object to the infrared thermometer online. According to the online measurement result, the temperature value measured by the thermometer is compensated or corrected to eliminate The additional error brought by the temperature measurement distance improves the accuracy of temperature measurement, and combines the infrared thermometer with precise positioning technology to realize online monitoring of multi-point temperature in space and save costs.

The technical solution of the present invention is: an infrared temperature measuring device based on ultrasonic ranging temperature compensation, including a CPU, horizontal and vertical stepping motors, an infrared temperature measuring unit, an ultrasonic ranging module, a wireless communication interface, and a calibration parameter storage Module, control system and calibration module, system positioning interface circuit, and the mechanical structure of the pan/tilt. The device, the positioning switch, and the mechanical structure of the pan/tilt are connected with the control system and the calibration module through the laser pointer, and are used to control the horizontal motor driver and the vertical motor driver through the control system and the calibration module to drive the horizontal direction and the vertical direction respectively under the instruction of the visible laser. The direction stepping motor performs spatial positioning on the measured point, and stores the spatial position of the measured point in the calibration parameter storage module; the calibration parameter storage module, the control system and the calibration module, the system positioning interface circuit and the ultrasonic distance measurement module are respectively connected with CPU connection, used for system positioning interface circuit to perform positioning search according to the spatial position coordinates of the measured point, and according to the distance value from the measured point to the infrared thermometer measured by the ultrasonic distance measuring module, the measured temperature value is compensated and Correction, to eliminate the additional error caused by the temperature measurement distance, the infrared temperature measurement unit transmits the measured temperature value signal to the CPU, and the CPU transmits it to the host computer through the wireless communication interface module.

The mechanical structure of the pan/tilt includes positioning bearings, rolling bearings, annular backing plates, upper and lower bases, side plates, support frames, fastening plates, and fastening cards. The upper and lower bases are sequentially connected with positioning bearings, rolling bearings and annular The backing plate and the upper base are equipped with a horizontal stepping motor, and the horizontal stepping motor is fixedly connected with the annular backing plate and the upper base through the stepping motor fasteners. The outer surface is fixedly connected with the stepping motor in the vertical direction, and a support frame is connected between the upper ends of the two side plates. Both sides of the support frame are respectively connected with the rotating shaft of the stepping motor in the vertical direction. The infrared thermometer of the temperature unit is equipped with an ultrasonic distance measuring module next to it. The infrared thermometer is fixedly connected to the laser pointer with a fastening card, and the side plate of the support frame and the side of the upper base are respectively equipped with positioning switches.

The positioning switch is a bimetal positioning switch with an insulating layer in the middle and metal sheets on both sides.

The stepper motor is a stepper motor with a step angle of 7.5°, a reduction ratio of 1/120, and a 1/4 subdivision driver.

The beneficial effects of the present invention are: the present invention adopts non-contact online temperature measurement, and adopts the mechanical structure of the pan-tilt controlled by the stepping motor, which ensures the safety and convenience of operation; The advanced stepping motor, secondary search technology, and ultrasonic ranging technology improve the accuracy and shorten the measurement time; the combination of infrared thermometer and precise positioning technology realizes online monitoring of multi-point temperature in space and saves costs.

Description of drawings

Fig. 1 is a control structure block diagram of the present invention;

Fig. 2 is a three-dimensional schematic diagram of the mechanical structure of the cloud platform;

Fig. 3 is an exploded view of the mechanical structure of the cloud platform;

Fig. 4 is a cross-sectional view of the positioning switch structure.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

As shown in Figures 1 to 3, the infrared temperature measuring device based on ultrasonic ranging temperature compensation of the present invention includes CPU, horizontal and vertical stepping motors 8, 16, infrared temperature measuring unit, ultrasonic ranging module, wireless Communication interface, calibration parameter storage module, control system and calibration module, system positioning interface circuit, PTZ mechanical structure, etc.

Horizontal and vertical stepping motors 8, 16, infrared temperature measurement unit, ultrasonic distance measuring module, laser pointer 12, positioning switch 9 are installed on the mechanical structure of the cloud platform, and the mechanical structure of the cloud platform communicates with the control system through the laser pointer 12 Connected with the calibration module, it is used to spatially locate the measured point through the control system and the calibration module to control the horizontal motor driver and the vertical motor driver to drive the horizontal and vertical stepping motors respectively under the instruction of the visible laser The spatial position of the point is stored in the calibration parameter storage module; the calibration parameter storage module, the control system and the calibration module, the system positioning interface circuit and the ultrasonic distance measurement module are respectively connected to the CPU, and the system positioning interface circuit is used for the spatial position of the measured point The coordinates are used to locate and search, and the distance value from the measured point to the infrared thermometer is measured by the ultrasonic ranging module, and the measured temperature value is compensated and corrected to eliminate the additional error caused by the temperature measurement distance. The infrared temperature measurement unit The measured temperature value signal is transmitted to the CPU through RS-232 communication, and the CPU transmits it to the host computer through the wireless communication interface module.

As shown in Figures 2 and 3, the mechanical structure of the platform includes positioning bearings 2, rolling bearings 3, annular backing plates 4, upper and lower bases 5, 1, side plates 6, support frames 7, fastening plates 11, and fastening clips 13 , between the upper and lower bases 5 and 1, the positioning bearing 2, the rolling bearing 3 and the annular backing plate 4 are sequentially connected from bottom to top, and the upper base 5 is equipped with a horizontal stepping motor 8, and the horizontal stepping motor 8 passes through the stepping motor The fastener 15 is fixedly connected with the annular backing plate 4 and the upper base 5, and the two sides of the upper base 5 are respectively fixedly connected with the side plates 6, and the outer surface of the upper end of the side plate 6 is fixedly connected with the stepping motor 16 in the vertical direction, and the two side plates 6 A support frame 7 is connected between the upper ends, and the two sides of the support frame 7 are respectively connected with the rotating shaft of the stepping motor 16 in the vertical direction. An ultrasonic distance measuring module 14 is installed, and the infrared thermometer 10 is fixedly connected to the laser pointer 12 with a fastening card 13, and a positioning switch 9 is installed on the side plate of the support frame 7 and the side plate of the upper base 5 respectively.

Due to the sliding effect of the rolling bearing 3, the stepper motor 8 on the upper base 5 can control the upper base 5 to rotate in the horizontal direction, and the stepper motor 8 on the side plate 6 controls the support frame 7 equipped with the infrared thermometer 10 to rotate vertically. direction, so as to realize the rotation of the support frame 7 in the space, install the infrared thermometer 10, the laser pointer 12, and the ultrasonic distance measuring module 14 on the support frame 7, and then realize the temperature measurement of the object to be measured in the space . Horizontal and vertical stepping motors 8 and 16 are stepping motors with a step angle of 7.5°, a reduction ratio of 1/120, and a 1/4 subdivision driver.

As shown in FIG. 4 , the positioning switch 9 is a bimetal positioning switch with an insulating layer in the middle and metal sheets on both sides.

The specific implementation of the present invention: first build the mechanical structure of the pan-tilt, under the instruction of the visible laser, control the horizontal motor driver and the vertical motor driver to spatially locate the measured point through the calibration board, and store the spatial position of the measured point in the calibration parameters In the storage module, the positioning interface circuit of the CPU control system performs a one-week positioning search according to the coordinates of these points. The distance is far and near, and the measured temperature value is compensated and self-calibrated. After the search is completed, the infrared temperature measurement unit transmits the temperature value to the CPU through the RS-232 communication method, and the CPU transmits the temperature value to the host computer through the wireless communication interface module. The process ends Afterwards, the system positioning can be calibrated through the control system and the calibration module.

When the present invention selects the stepper motor, selects the stepper motor with reduction ratio for use, uses subdivision drive technology, improves measurement accuracy, in the present invention, adopts the stepper motor that step angle is 7.5 °, reduction ratio 1/ 120, and using a 1/4 subdivision driver, the accuracy can reach 0.015°. If the object to be tested is measured at a distance of 8m, each time a pulse is given, the thermometer rotates an arc of 2mm, with accurate positioning and small error; technology online

Get the distance from the measured object to the infrared thermometer, and compensate or correct the temperature value measured by the thermometer according to the online measurement results, eliminate the additional error caused by the temperature measurement distance, and improve the accuracy of temperature measurement; in positioning In the search process, the secondary search technology is adopted, that is, the stepper motor is quickly rotated to the object to be measured, and then the CPU is used to control the subdivision driver to increase the number of subdivisions and further improve the positioning accuracy. Measure the temperature of the object to be measured once, and search for the maximum temperature value, that is, as the temperature of the point to be measured, to improve the temperature measurement accuracy of the system; the system uses a bimetal positioning switch. When the system is reset, the rotating mechanism drives the L The metal rod of the type moves to the starting position. When the metal rod touches the metal sheets on both sides of the switch, the switch is closed, and the control system stops the motor to continue to rotate. At this time, it is recorded as the starting point of the system rotation. This special structure eliminates the common switch The stroke error caused by the system has good repeatability of system reset and improves the positioning accuracy of the system.

The invention can carry out non-contact online temperature measurement on the points to be measured distributed in various positions in the space, with high precision and fast measurement speed; the structure design is reasonable, and the infrared thermometer is combined with the precise positioning technology to realize the online multi-point temperature in space. Monitoring saves costs.

Claims (4)

1. infrared temperature measurement apparatus based on the supersonic sounding temperature compensation; Comprise CPU, horizontal direction and vertical direction stepper motor (8; 16), infrared measurement of temperature unit, supersonic sounding module, wireless communication interface, calibration parameter memory module, control system and calibration module, system's locating interface circuit and The Cloud Terrace physical construction; It is characterized in that: the stepper motor (8 that is used for horizontal direction and vertical direction adjustment is housed respectively above the said The Cloud Terrace physical construction; 16), infrared measurement of temperature unit, supersonic sounding module, laser designator (12) and positioning switch (9); Said The Cloud Terrace physical construction is connected with calibration module with control system through laser designator (12), is used under the indication of visible laser, drives horizontal direction and vertical direction stepper motor (8 respectively through control system and calibration module controlling level motor driver and motor vertical driver; 16) space orientation is carried out in the measured point, and store the locus of measured point in the calibration parameter memory module into; Said calibration parameter memory module, control system are connected with CPU respectively with the supersonic sounding module with calibration module, system's locating interface circuit; Be used for system's locating interface circuit and position search according to the locus coordinate of measured point; And record the measured point to the distance value of infrared thermometer according to the supersonic sounding module; The temperature value that records is compensated and revises; Eliminate the additive error that the thermometric distance is brought, the infrared measurement of temperature unit is sent to CPU with the temperature value signal that records, and CPU is sent to host computer through Wireless communication interface module again.

2. the infrared temperature measurement apparatus based on the supersonic sounding temperature compensation according to claim 1; It is characterized in that: said The Cloud Terrace physical construction comprises alignment bearing (2), rolling bearing (3), annular backing plate (4), upper and lower base (5; 1), side plate (6), bracing frame (7), binding (11), fastening card (13); Said upper and lower base (5; 1) connects alignment bearing (2), rolling bearing (3) and annular backing plate (4) between from bottom to up successively, vertical direction stepper motor (15) is housed above the upper bed-plate (5); Horizontal direction stepper motor (8) is fixedly connected with upper bed-plate (5) with annular backing plate (4) through stepper motor securing member (15); Both sides are fixedly connected side plate (6) respectively above the upper bed-plate (5); Be fixedly connected vertical direction stepper motor (8) on the lateral surface of side plate (6) upper end, two side plates (6) are connected with bracing frame (7) between the upper end, and bracing frame (7) both sides are connected with the rotating shaft of vertical direction stepper motor (16) respectively; Pass through the infrared thermometer (10) that binding (11) is fixedly connected the infrared measurement of temperature unit in the middle of above the bracing frame (7); Supersonic sounding module (14) is equipped with on the next door, is fixedly connected laser designator (12) with fastening card (13) above the infrared thermometer (10), on bracing frame (7) side plate and upper bed-plate (5) side positioning switch (9) is housed respectively.

3. the infrared temperature measurement apparatus based on the supersonic sounding temperature compensation according to claim 1 is characterized in that: said positioning switch (9) is the bimetallic strip positioning switch, and the centre is provided with insulation course (20), both sides metal clad sheets (21).

4. the infrared temperature measurement apparatus based on the supersonic sounding temperature compensation according to claim 1; It is characterized in that: said horizontal direction and vertical direction stepper motor (8; 16) for step angle be 7.5 ° stepper motor, reduction gear ratio 1/120, and 1/4 subdivision driver is housed.

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