CN206804184U - A kind of contactless temperature measuring equipment - Google Patents

Abstract

The utility model proposes a non-contact temperature measuring device, which is characterized in that: the non-contact temperature measuring device is divided into two parts: temperature sensing and temperature display, wherein the temperature sensing part includes a temperature-sensitive color-changing plate, Camera, flashlight, video decoding module, front-end control module and wireless transmitting module; the temperature display part includes wireless receiving module, image processing module, receiving control module and display module. The utility model proposes a real-time temperature measuring device which utilizes the temperature sensitive characteristics of thermosensitive liquid crystals to cooperate with image processing technology and wirelessly transmits. That is, changes in temperature will affect the color of the thermosensitive liquid crystal, and the temperature can be measured by measuring the three primary color coordinates of the color of the thermosensitive liquid crystal. The device can measure the temperature in real time in a large range and at a long distance, and has the characteristics of compact and simple structure, low cost, easy operation and the like.

Description

A non-contact temperature measuring device

technical field

The utility model relates to the field of non-contact temperature detection, in particular to a temperature measuring device used in electric power and other special fields.

Background technique

In order to be able to transmit electricity over long distances, the voltage needs to be raised before power transmission, and the voltage needs to be lowered after it is delivered to the destination. In this process, the substation plays the role of step-up and step-down. Substations use transformers to step up and down the voltage, and the coils of the transformers will generate a lot of heat during the working process, which will increase the surrounding temperature. Excessive ambient temperature will threaten the normal operation of substation facilities. Therefore, in order to ensure the safe operation of substation facilities, it is necessary to monitor the temperature of substation facilities in real time.

At present, the equipment for measuring temperature can be divided into contact type and non-contact type according to different usage methods. The most widely used is the contact temperature measuring equipment. This type of equipment uses temperature sensors such as thermistors and thermocouples to convert temperature signals into voltage or current signals. The sensor is usually connected directly to the signal processing circuit by wires. The signal processing circuit processes and calculates the signal output by the sensor to obtain the temperature value. For example, the temperature measuring device disclosed in Patent No. ZL2014201063003 is a typical contact temperature measuring device. However, the temperature sensors of this kind of temperature measuring device are generally conductors. When used in the temperature measurement of power equipment, the sensor needs to be in close contact with the power equipment. Once the insulation effect of the contact point is not good, it is easy to cause a safety accident. When the non-contact temperature measuring equipment measures, the electronic device does not need to be in direct contact with the object to be measured, and the safety is improved, so it is more suitable for application in some more dangerous environments. Current non-contact temperature measuring equipment generally uses infrared sensors for measurement. However, the infrared sensor is greatly affected by the external environment, and the temperature of the sensor and the distance between the sensor and the measured object will affect the measurement accuracy. In order to improve the measurement accuracy, the infrared sensor often needs to be refrigerated during use, which brings inconvenience to use and high cost.

Contents of the invention

The utility model proposes a non-contact real-time temperature measurement device that utilizes the temperature-sensitivity of thermosensitive liquid crystals in conjunction with image processing technology and transmits wirelessly, which can realize temperature measurement in power application systems and guarantee people The safety of the system provides technical support for the temperature detection of the power system.

In order to solve the above technical problems, the utility model adopts the following technical solutions:

A non-contact temperature measurement device is divided into two parts: temperature sensing and temperature display, wherein the temperature sensing part includes the object to be measured, a temperature-sensitive color plate, a black box, a camera, a flash, a front-end control module, a video processing module, a wireless Transmitting module and several wires; temperature display part includes wireless receiving module, receiving control module, image processing module, display module and several wires, it is characterized in that: described front-end control module obtains video signal by controlling camera and flashlight, and through The video processing module and the wireless transmitting module send out the video signal. The receiving control module receives video signals through the wireless receiving module and obtains image information through the image processing module, and finally calculates and displays the temperature through an algorithm.

Further, the temperature-sensitive color-changing plate is a rectangular white aluminum plate, and uniform thermo-sensitive liquid crystals are sprayed on the temperature-sensitive color-changing plate.

Further, the black box is a closed space, and the bottom of the black box is made of a material with excellent thermal conductivity.

Further, the temperature-sensitive color-changing plate is placed on the bottom of the black box, and the junction is coated with uniform silicone grease to ensure heat conduction.

Further, a flashlight is installed next to the camera, and the color rendering coefficient of the flashlight is above 90, which ensures the authenticity of the captured images and improves the accuracy of temperature measurement.

Further, the flashlight is a flashlight with a concave mirror, which can improve the uniformity of light irradiated on the heat-sensitive liquid crystal and improve the accuracy of temperature measurement.

The beneficial effects of the utility model:

The utility model is a non-contact temperature measuring device, the electronic device of the utility model device does not directly contact with the object to be measured, and the test personnel do not need to approach the test site, which greatly improves the safety of the measurement process. The output signal of the temperature sensing device is transmitted to the temperature display device through wireless, which can realize remote measurement. One temperature display device can correspond to multiple temperature sensing devices, which saves costs. The device of the utility model also has the characteristics of high measurement precision, fast response speed, and being suitable for the temperature of the convective heat exchange surface.

These features and advantages of the utility model will be described in detail in the following specific embodiments and accompanying drawings.

Description of drawings

Fig. 1 is the structural diagram of the temperature sensing part of the present utility model;

Fig. 2 is the structural diagram of the temperature display part of the present utility model;

Fig. 3 is a functional block diagram of the temperature sensing part of the utility model;

Fig. 4 is a functional block diagram of the temperature display module of the present invention;

detailed description

Below in conjunction with accompanying drawing, the utility model is further described:

A non-contact temperature measuring device is divided into two parts: temperature sensing and temperature display, wherein the temperature sensing part includes an object to be measured (1), a temperature-sensitive color changing plate (2), a black box (3), and a camera (4) , a flashlight (5), a front control module (8), a video processing module (10), a wireless transmitting module (12) and several wires (6, 7, 9, 11); the temperature display part includes a wireless receiving module (13), A control module (15), an image processing module (17), a display module (19) and several wires (14, 16, 18) are received. It is characterized in that: the front-end control module (8) obtains video signals by controlling the camera (4) and the flashlight (5), and sends the video signals through the video processing module (10) and the wireless transmitting module (12). The receiving control module (15) receives video signals through the wireless receiving module (13), obtains image information through the image processing module (17), and finally calculates and displays the temperature through an algorithm. The object to be measured (1) is placed on the bottom of the black box (3), and there is a temperature-sensitive color-changing plate (2) on the bottom of the black box (3), and the camera (4) and flashlight (5) are placed in the black box (3) and the direction of the camera (4) and the flashlight (5) are all towards the direction of the temperature-sensitive color-changing plate (2). The camera (4) and the front control module (8) are connected by wires (6), the flashlight (5) and the front control module (8) are connected by wires (7), and the video processing module (10) and the front control module (8) are used The wire (9) is connected, and the wireless transmitting module (12) is connected with the front-end control module (8) with the wire (11). The wireless receiving module (13) is connected to the receiving control module (15) with a wire (14), and the receiving control module (15) is connected to the image processing module (17) through a wire (16), and the display module (19) is then connected through a wire (18) Connect the receiving control module (15). The front-end control module (8) takes pictures by controlling the camera (4) and flashlight (5), and the flashlight (5) should not be turned on for a long time, because long-time light will affect the temperature of the temperature-sensitive liquid crystal, thereby causing a problem to the temperature measurement. interference. The temperature-sensitive color-changing plate (2) is a rectangular white aluminum plate, and uniform thermo-sensitive liquid crystals are sprayed on the temperature-sensitive color-changing plate. The black box (3) is a closed space, and the bottom of the black box is a material with excellent thermal conductivity. The temperature-sensitive color-changing plate (2) is placed on the bottom of the black box (3), and the junction is coated with uniform silicone grease to ensure heat conduction. A flashlight is installed next to the camera (4), and the color rendering coefficient of the flashlight is above 90 to ensure the authenticity of the captured images and improve the accuracy of temperature measurement. The flashlight (5) is a flashlight with a concave mirror, which can improve the uniformity of light irradiated on the heat-sensitive liquid crystal and improve the accuracy of temperature measurement. The function of the video decoding module (10) is to convert the analog video signal into a digital video signal. The function of the front-end control module (8) is to control the flashlight (5), the camera (4), the decoding (10) of the video decoding module and the signal transmission of the wireless transmitting module (12). The front-end control module (8), the video decoding module (10), and the wireless transmitting module (12) are welded on the printed circuit board. The function of the image processing module (17) is to extract the color information of a certain pixel point in the image and realize temperature calculation according to the built-in algorithm. The wireless receiving module (13), the image processing module (17), the receiving control module (15) and the display module (19) are welded on another printed circuit board.

Working principle of the utility model:

Thermosensitive liquid crystal is a material that can change color as the outside temperature changes. Thermosensitive liquid crystals are generally cholesterol and its derivatives. The liquid crystal molecules are flat and arranged in layers, the molecules in the layers are parallel to each other, and the long axes of the molecules are parallel to the layers. The multi-layer molecules are gradually twisted into a helix and arranged in a helical structure along the normal direction of the layer. The periodic layer spacing is called the pitch, and the pitch acts as a diffraction grating. As the temperature increases, the pitch becomes smaller, the scattered light waves move to shorter wavelengths, and the color changes from red to purple accordingly. When the temperature is lowered, the color changes from purple to red again. We use image technology to establish a model of the corresponding relationship between the three primary color coordinates in the image and the temperature, and we can fit the relationship between the three primary color coordinates and the temperature of the heat-sensitive crystal image. In this way, we can measure the temperature through image technology.

The working process of the utility model: spray heat-sensitive liquid crystal on one surface of the temperature-sensitive color-changing plate. In order to prevent the surrounding light from affecting the color recognition, white plastic plates are installed on the four sides of the temperature-sensitive color-changing plate for shading. Apply heat-conducting silicone grease to the other side of the temperature-sensitive color-changing plate and then contact it with the object to be measured. When the temperature of the object to be measured changes, the color of the liquid crystal coating on the temperature-sensitive color changing plate will change. A flash mounted on the camera and a concave reflector form a white light source. The direction of the light source is the same as that of the camera to ensure that the object captured by the camera can show its own color under sufficient light. The camera is installed at an appropriate distance from the temperature-sensitive color-changing plate, and the camera is aimed at the temperature-sensitive color-changing plate. In order to prevent the long-term exposure of the flashlight from affecting the temperature of the thermal liquid crystal, the front-end control module will control the flashlight and the camera to capture images and transmit the captured images to the video decoding module through the front-end control module for decoding. The analog signal transmitted by the camera is sampled and converted from analog to digital to output a digital signal. The working state of the video decoding module is controlled by the front-end control module. The front-end control module receives the digital signal output by the video decoding module, intercepts a frame of image data from the digital signal stream at regular intervals, adds address codes, and transmits it through the wireless transmitting module. The wireless receiving module, the receiving control module and the display module are welded on the printed circuit board, and then packaged with a plastic casing to form a temperature display device. When the wireless receiving module successfully receives the electromagnetic wave signal from the temperature measuring point, it transmits the information to the receiving control module, and the receiving control module transmits the received information to the image processing module. The image processing module first reads out the address information to determine the serial number of the temperature sensing device of the information source. Then the image processing module obtains the single-frame image sent by the temperature sensing device, selects several pixels in the center of the image, and obtains the color coordinate values of the three primary colors of these pixels. Before the equipment is installed and used, the temperature sensing system is placed in the incubator, the temperature of the incubator is adjusted, and the color coordinates of the three primary colors of the temperature-sensitive color plate are extracted. Use mathematical analysis software such as matlb to model the functional relationship between temperature and the three primary color coordinate values of the color. Save the processed three-primary color coordinates and temperature relationship function in the ROM of the image processing module. When the device is actually in use, the image processing module can use this function to calculate the temperature value, and the receiving control module will transmit the measured temperature value and the corresponding temperature sensing device number to the display module, and the display module will display the temperature after the corresponding number corresponding temperature value.

The utility model is a non-contact temperature measuring device, which is mainly but not limited to be used in electric power facilities or occasions where other people may approach danger.

Claims (6)

1. A non-contact temperature measuring device is divided into two parts: temperature sensing and temperature display, wherein the temperature sensing part includes the object to be measured (1), temperature-sensitive color changing plate (2), black box (3), camera ( 4), a flashlight (5), a front control module (8), a video processing module (10), a wireless transmitting module (12) and several wires (6, 7, 9, 11); the temperature display part includes a wireless receiving module (13 ), a receiving control module (15), an image processing module (17), a display module (19) and several wires (14, 16, 18); it is characterized in that: the described front-end control module (8) controls the camera (4 ) and flashlight (5) to obtain the video signal, and the video signal is sent out by the video processing module (10) and the wireless transmitting module (12); the described receiving control module (15) receives the video signal by the wireless receiving module (13) signal and obtain image information through an image processing module (17), and finally calculate the temperature by an algorithm and display it. 2. A kind of non-contact temperature measuring device according to claim 1, characterized in that the temperature-sensitive color-changing plate (2) is a rectangular white aluminum plate, and uniform thermosensitive liquid crystals are sprayed on the temperature-sensitive color-changing plate. 3. A non-contact temperature measuring device according to claim 1, characterized in that the black box (3) is a closed space, and the bottom of the black box is made of a material with excellent thermal conductivity. 4. A kind of non-contact temperature measuring device according to claim 1, characterized in that the temperature-sensitive color-changing plate (2) is placed on the bottom of the black box, and the junction is coated with uniform silicone grease to ensure conduction of heat. 5. A kind of non-contact temperature measuring device according to claim 1, characterized in that said camera (4) is equipped with a flashlight beside it, and the color rendering coefficient of the flashlight is above 90, ensuring the trueness of the captured image. To improve the accuracy of temperature measurement. 6. A kind of non-contact temperature measuring device according to claim 1, characterized in that said flashlight (5) has a flashlight with a concave mirror, which can improve the uniformity of light irradiated on the heat-sensitive liquid crystal and improve the temperature measurement. accuracy.