电热膜热成像英文文献.docx

1、电热膜热成像英文文献英文文献翻译The technology of generating infrared image based on electric heating film technology 基于电热膜技术的红外图像生成技术文献来源： 脉冲功率激光技术国家重点实验室 The technology of generating infrared image based on electric heating film technologyABSTRACTThe technology of generating infrared image based on electric heati

2、ng film technology by its resistance per unit area was studied. A Lifgt-off-road vehicle was used as an object to be simulated. An infrared thermograph was used to photography the light-off-road vehicle from a specific corner. As a result several infrared images of the light-off-road vehicle were ob

3、tained and the thermal distribution of the vehicle was also obtained at the same time. A matlab program was used to process the image. The image was divided into several areas according to its grey level. Each area has its own temperature range. The average temperature of each area was calculated. A

4、 thermal balance equation was established according to the average temperature of each area and the environment temperature. By solving these equations, the radiant existances of these areas were gotten. The heating power per unit area of these areas was calculated. The electric heating film was pre

5、paration accordingly. The power was applied on the film and the infrared thermograph was used to observe it. The infrared image of the film has a high similarity with the true light-off-road vehicles.Keywords: electric heating film, infrared image, simulation1. PRINCIPLES OF OPERATIONAll kinds objec

6、ts have infrared radiation. The infrared radiant characteristic of an object is depending on its surface temperature and its surface emissivity. The radiation can be calculated by Planck equation. The usual form of the equation is written in terms of the radiant exitance as a function of wavelength.

7、 Considering the emissivity of a certain object, the radiant exitance can be written 1: (1)Where is the spectral radiant exitance, is the first radiation constant and is the second radiation constant. They are given by:Where c is the speed of light in vacuum, h is Plancks constant, k is Boltzmanns c

8、onstant, and T is the temperature in kelvins.Since the emissivity is fixed for certain material, the temperature is the major factor that influences infrared radiation. It is usually more useful to know the value of the total power emitted from a body, rather than its spectral extent. The well-known

9、 Stephan-Boltzmann law gives the total radiant exitance as: (2)Where is the emissivity of an object. is the Stephan-Boltzmann constant. It has been evaluated and is given byFor an object, the reason of it showing different infrared image is that it has different temperature on different parts of it.

10、 Thus we can simulate a true objects infrared image by reappearing the temperature of the object.The technology of generating infrared image based on electric heating film technology was brought forward according to the infrared radiation theory. The main course is: the infrared image of an object w

11、as obtained firstly, and then the image was divided into several areas according to its temperature and its grey level. The radiation power of these parts was calculated. The resistance per unit area of these parts were calculated when the voltage of the film was certain. The heating film was prepar

12、ed according to the resistance per unit area. When the film was heated by electricity power, the relevant infrared image will appear.2. INFRARED IMAGE OBTAIN OF AN OBJECT AND RELATIVELY CALCULATION2.1 infrared image and its temperature distributing A Light-off-road vehicle was used as an object to b

13、e simulated. The vehicle was fired up in idle state. Ten minutes late, an infrared thermograph was used to photography the light-off-road vehicle from a specific corner. Fig.1 was the infrared image of the vehicle.Fig.1 infrared image of a Light-off-road vehicleThe analysis and process to the image

14、was carried out. The infrared image was divided into seven temperature areas by its grey level. These areas showed in fig.2. The average temperature of the area is the same for those areas which have the same number. Fig.2 the grey level of the vehicleThe average temperature of these areas showed in

15、 table 1 and the temperature of background is 24.Table 1 The average temperature of different areas Area No.1234567Average Temperature()38.437.031.026.826.131.238.0For these areas, we hypothesized that the area “i” has a temperature, the temperature background is. The acreage of area “i” is. The acr

16、eage of these areas is calculated. 2.2 Heating power calculation When the electric heating film was powered on, most of the electron power it gotten was converted to heat power. The temperature of these areas rose. The temperature of these area achieve maximum when the area was in thermal equilibrium state with the environment. When the fil