CN100425959C - Infrared source heat image detecting method - Google Patents

Abstract

The invention discloses a method for detecting the thermal image of an infrared source, which includes a dot matrix photosensitive imaging chip and filters of different wavelengths selected according to needs to form a detector for detecting specific wavelengths. The detector It is combined with an optical lens in front of the dot-matrix photosensitive imaging chip. The output end of the dot-matrix photosensitive imaging chip is connected to the microprocessor. The microprocessor scans the infrared heat source image on the photosensitive imaging chip and records the photosensitive bright spots Down, different brightness levels correspond to different temperature levels. This method of detecting the thermal image of the infrared source and the detector obtained can detect the heat source generated in the monitoring area, judge the size and plane position of the heat source; Judgment: judge the total power of the heat source, provide an accurate heat source map, and provide a basis for accurately judging whether there is a fire. And detect the existence and movement of people or animals, and locate the intruding people or animals. It can be widely used in intrusion alarms and perimeter alarms in the field of technical protection.

Description

A Method for Detecting Thermal Image of Infrared Source

technical field

The invention relates to a method for detecting and quantifying the heat source generated in the monitoring area, which is mainly used in fire-fighting, technical defense or similar environments, especially a method for detecting the thermal image of the infrared source.

technical background

As we all know, the dot-matrix photosensitive imaging chip is mainly used as a camera and other equipment used in the visible light region as an image photosensitive device, and its application outside the visible light band is rare. In a technology-defense or similarly demanding environment. The photosensitive devices used in this type of technology are usually completed by using pyro-release devices. Due to limitations in technology and cost, they are currently constructed using pyro-release devices.

The fire detectors (commonly known as probes) commonly used in the world now mainly use point detectors, that is to say, the detectors only detect the environmental parameters of their installation points. The detection content of fire detectors mainly includes two categories: temperature and smoke:

A. Smoke detection mainly adopts: 1. Blocking method. A labyrinth-shaped mirror is set in the detector, a beam of infrared light is emitted from one end, and the infrared light is received at the other end. When the smoke enters the maze, it will block the infrared light and receive The end judges whether there is smoke according to the change; 2. A radiation source emits ions, and a receiving device is installed at the other end. When smoke appears in the radiation area, it will block part of the ions of the radiation source, and the receiving device at the receiving end can distinguish The above-mentioned changes can be detected to identify smoke; similar methods can also detect carbon monoxide and so on.

B. Temperature identification method: The technical feature is to use the differential temperature method to detect the temperature change of the monitoring environment, and also to use the absolute temperature detection method to detect the absolute temperature or temperature rise rate of the detector installation point.

The above-mentioned detection methods are based on the data of the detector installation point as the judgment basis, and what it can reflect is "yes" or "no". The temperature of the detector is measured by analog quantity, and the overall situation of the room where the monitoring point is inferred. Since the space of the detector installation point is different, the parameters reflected by the detector installation point are completely different under the same critical state. The problem of reasonable setting of the critical threshold control point is not solved, resulting in almost no false alarms in the fire alarm system. At the same time, only an estimation method can be used for the monitoring area, and it cannot be precisely defined.

Contents of the invention

The purpose of the present invention is to provide a way to scan the monitoring area to objectively reflect whether there is a fire in the monitored area, scan the infrared heat source with a specified wavelength in the monitoring area, and provide accurate heat source changes according to the coordinates, in order to solve the deficiencies in the prior art. A method of detecting the thermal image of an infrared source to accurately judge whether there is a fire tendency.

In order to achieve the above purpose, a method for detecting thermal images of infrared sources designed by the present invention includes a dot matrix photosensitive imaging chip and filters of different wavelengths selected according to needs to form a detector for detecting specific wavelengths , the detector is combined with an optical lens in front of the dot-matrix photosensitive imaging chip, the output end of the dot-matrix photosensitive imaging chip is connected to the microprocessor, and the microprocessor scans the infrared source thermal image on the photosensitive imaging chip , Record the bright spots that have been exposed to light, and the different brightness levels correspond to different temperature levels. The optical lens combination includes a combination of an optical imaging lens and a filter or an optical imaging lens that also functions as a filter. The filters of different wavelengths may be 0.78-8.5 μm wavelength filters for fire detectors or 8.5-12 μm wavelength filters for technical defense detectors. The microprocessor can be a DSP processor or other CPU with program control.

In order to accurately determine the basic parameters such as the position, size, and development trend of the infrared heat source, the described infrared source thermal image measurement diameter and embedded coordinates are embedded in a dynamic way, and the basic coordinate interval is set to a certain interval. After the thermal image of the infrared source is measured, the diameter from the coordinates of the end point to the coordinate of the starting point is measured. When multiple infrared source thermal images are found, the infrared heat source is described in the coordinate interval corresponding to the smallest diameter of the infrared heat source. When changing the coordinate parameters, the transmission signal automatically loads the changed coordinate interval data to the main controller.

By presetting the microprocessor in the detector or setting the ambient infrared source data on site, the detector can "remember" the coordinates and diameters of the normal infrared heat sources that already exist in the area it monitors. The method is: 1. In the main controller, mark the position of the infrared heat source on the coordinates and download it to the detector. When the detector finds the thermal image of the infrared source on site, it will compare the comparison memory database in the memory with that in the database. The thermal image of the infrared source that does not match the memory will be uploaded to the main controller through the transmission interface as dangerous information. When the thermal image of the infrared source matches the coordinates and diameters marked in the database, corresponding processing will be taken (for example, no response). 2. When it is in the debugging stage or the "knowledge" stage, the detector will transfer the on-site infrared heat source and coordinates to the memory, and the detector will memorize the above parameters, and mark the above infrared source thermal image as a normal information source.

In order to distinguish the infrared heat sources generated at different locations and at different times in the monitoring area, the monitoring range can be delimited by marking the regional monitoring range, and the detector can be set to complete different monitoring in different time periods by setting the time window. area. The implementation method is: 1. When the detector communicates regularly with the main controller, it will obtain the real time, and query the database corresponding to different times according to the time, so as to know the management coordinate range at different times. 2. Permanently set some unmanageable coordinate sections, and the infrared heat sources found by the detector in the above coordinate sections will not be processed.

In the method for detecting the thermal image of the infrared source described in the present invention, the detector adopts an equivalent method to describe the power of the infrared heat source. The data obtained by multiplying represents the equivalent of heat source power.

A method for detecting infrared heat source thermal image described in the present invention mainly solves the problem that A. fire detectors can carry out qualitative and quantitative detection to the infrared heat source of the monitored environment. After using the present invention, it is possible to monitor The heat source generated in the area is detected, and the size and plane position of the heat source can be judged. B. According to the test results, it can judge the movement and development trend of the heat source, judge the total power of the heat source, and provide an accurate heat source map, which provides a basis for accurately judging whether there is a fire. C. After replacing the 9-10μm filter, it can detect the existence and movement of people or animals, and can analyze and judge whether it is a person or animal from the thermal image of the infrared source; it can locate the intruding person or animal. It can be applied to intrusion alarms and perimeter alarms in the field of technical protection.

Adopt a kind of method described in the present invention to detect the thermal image of infrared source, according to the different selection of required filter wavelength in the combination of optical lens, can obtain two kinds of detectors: one kind can be applied to the field of fire protection, as Fire detectors; another class mainly used to detect the presence and location of people or animals.

When the detector or monitoring device obtained by a method for detecting the thermal image of the infrared source described in the present invention is applied to the fire detector, it has the advantages compared with the prior art:

1. Existing detectors mainly detect whether there is an object to be detected at the installation point of the detector. For example, a smoke detection detector can only be detected when smoke passes through the detector. The new technology scans the monitoring area to detect whether there is an infrared heat source. As long as the infrared heat source appears within the detector's line of sight, it can be detected. Since the "line of sight" method is used to detect the infrared heat source, its method simulates human observation and can objectively reflect the entire Monitor the area for infrared heat sources. Existing products can only detect the temperature at the installation point of the detector, but cannot provide detection for the regional monitoring range.

2. The detector provides basic parameters such as the position, size, and development trend of the infrared heat source by detecting the diameter of the infrared heat source and the coordinates of the infrared heat source. report phenomenon. Existing detectors can only provide "yes" or "no", and cannot provide further data.

3. On the detector, the temperature is proportional to the "brightness" of the detector. By detecting the infrared image brightness of the infrared heat source and the diameter of the infrared heat source, and multiplying the above parameters, the "heat source power equivalent" parameter can be obtained. The parameters can provide qualitative indicators for the infrared heat source and the degree of danger. Existing detectors can only provide "yes" or "no", and cannot provide further reference data.

The detector adopting the technology of the present invention adopts an active method to detect infrared heat sources, and its detection process uses a "visual" method to detect infrared radiation sources, which can realize long-distance detection and isolation detection, and can be easily installed and used in explosion-proof or other similar special environments . The existing technology does not have long-distance detection capability, and it is difficult to prevent explosion.

Compared with the prior art, when the detector or monitoring device obtained by a method for detecting infrared source thermal image described in the present invention is applied to the field of security technology prevention, its advantages are:

1. Replace the detector filter with a range of 9-10 μm, and cooperate with a CCD photosensitive imaging chip (CMOS is generally not stable at this wavelength, so a CCD photosensitive imaging chip is used, and this type of chip can effectively detect light at 9-10 μm), It can detect the infrared heat source generated by the human body. Using the same technology, it can detect and locate objects that generate 25-50°C. It can detect the size of the intrusion source and the infrared image, and can provide the specific coordinates of the infrared heat source. There are no detectors using CCD photosensitive imaging chips in the prior art. At present, pyrotubes are used as sensing devices, which can only detect "yes" or "no", and cannot provide further information.

2. The present invention can use software to divide the management area on the detector image coordinates, and this technology is very suitable for delimiting the monitoring area in the open space. Existing technology can only be used in closed spaces, and it cannot provide all information except "yes" or "no" in the monitored area. Nor can it be used in an open area.

Description of drawings

Fig. 1 is a schematic diagram of the detection and monitoring area of the detector;

Fig. 2 is a flow chart of the DSP processor processing program;

Fig. 3 is a schematic diagram of detecting and locating the infrared heat source by the detector;

Fig. 4 is a structural schematic diagram of an infrared detector;

Fig. 5 is a schematic diagram of the installation position of the detector in Embodiment 1;

Fig. 6 is a schematic diagram of the installation position of the detector in Embodiment 2.

Detailed ways

The present invention will be further described below with reference to the accompanying drawings. But this embodiment does not limit the content of the present invention.

Example 1

This embodiment describes a method for detecting thermal images of infrared sources, which includes a dot-matrix photosensitive imaging chip and filters of different wavelengths selected according to determined needs to form a detector for detecting specific wavelengths, as shown in the figure As shown in 4, the detector is combined with an optical lens in front of the dot-matrix photosensitive imaging chip. The image is scanned to record the light-sensitized bright spots. Here, the brightness of the light-sensing points can be recorded in 64 gray levels, which correspond to the temperature. The dot-matrix photosensitive imaging chip here can be a CMOS or CCD photosensitive imaging chip; the optical lens combination includes a combination of an optical imaging lens and a filter or an optical imaging lens that also functions as a filter. The filters of different wavelengths may be 0.78-8.5 μm wavelength filters for fire detectors or 8.5-12 μm wavelength filters for technical defense detectors. The microprocessor may be a DSP processor or other CPU with program control, and the program control flow is shown in FIG. 2 .

For describing the measurement diameter and embedding coordinates, the coordinate embedding is carried out in a dynamic manner, and the basic coordinate interval is set to a certain interval. In this embodiment, the basic coordinate interval is set to 5 cm. After the detector detects the infrared source thermal image, it measures its Diameter, the diameter of the thermal image of the infrared source is calculated by subtracting the coordinates of the starting point from the coordinates of the end point. After detecting the thermal image of the infrared source, the detector compares whether its diameter is greater than 5 cm. If it is greater than 5 cm, the coordinates are adjusted at intervals of 5 cm. The coordinates close to the diameter of the infrared heat source but smaller than its diameter are used as real-time coordinates. When multiple infrared source thermal images are found, the infrared heat source is described by the coordinate interval corresponding to the smallest infrared heat source diameter. When changing the coordinate parameters, the transmission signal automatically loads the changed coordinate interval data to the main controller.

According to the statistics of the fire occurrence, the early stage of the fire will mainly produce mid-near infrared radiation and smoke. In order to reduce the interference source as much as possible, in the detector described in this embodiment, we choose to detect the infrared source in the range of 250°C to 350°C. The wavelength is between 4.5 and 5.5 μm. The main reason for choosing this light source is to consider that the infrared sources mapped by this spectrum are not many in daily life and are easy to be identified. As we all know, the main working band of CMOS or CCD photosensitive imaging chip is in the visible light band. According to the optical principle, we know that the infrared source that needs to be detected belongs to the mid-near infrared source. The spectral range produced by the fire involves infrared, visible light, and ultraviolet bands. The range of radiation spectrum generated by lighting sources and household electrical equipment is also within the scope of our detection, so our design idea is to use filters to filter out all light sources in the visible light band, mainly through filters to filter out all light sources greater than and less than 4.5 The information in the wavelength range of ~5.5 μm is filtered by the filter, so that only the infrared heat source information in the wavelength range of 4.5 to 5.5 μm on the CMOS or CCD photosensitive imaging chip can reach the photosensitive imaging chip. Visible light and unnecessary light sources can be filtered out. At this time, if the infrared heat source of the monitored band appears within the scanning range of the detector, it is as clear as we watch a luminous body in the dark. Of course, it is impossible for the filter to filter out all the interference sources, but due to the high bandwidth selectivity of the filter, compared with the information of other bands, the information of 4.5-5.5μm wavelength will be highlighted, and we can easily to identify it.

In order for the detector to accurately measure the infrared heat source and conditions in the monitoring area, the detector needs to be parameterized and calibrated:

A. Measurement area setting method: the vertical distance from the detector installation point to the ground and the calibration of the detector monitoring area: since the present invention can be installed in any different space, when the detected environment is different, for example, a heat source with a diameter of 1 square meter is in the The image generated when the distance from the detector is 3 meters is different from that generated when the distance is 15 meters. In order to ensure that the infrared image detected at each physical position is consistent with the actual situation, the installation space position of the detector must be adjusted. Calibration and memory, the process is to manually input the vertical height and monitoring area after the detector is installed, or use a beacon (an infrared generator capable of emitting 4.5-5.5μm infrared source) to mark the monitoring area, and the detector will be based on The vertical distance and the beacon distance measure and calculate the monitoring area, (as shown in Figure 3, the base of the isosceles triangle is the monitoring area, and the four corners can also be marked with beacons as shown in Figure 1, and the four corners formed between The closed interval is the monitoring area). Since the detector has the ability to scan and detect according to coordinates, the system has the ability to download polygonal monitoring areas from the main controller to the detectors. When it is required to use polygons to build monitoring areas, the polygonal monitoring area is mainly constructed by describing coordinate points of. The method and formula for measuring the vertical distance between the thermal image of the infrared source and the detector and the diameter of the infrared heat source: If the detector is installed on the top of the middle of the room, the detector viewing angle is 140 degrees (α=70°), and the room height X=4 meters (see Fig. 3), then the most extended side length Z=4tg70°×2 ^1/2 , the distance between the center point of the detector and the edge of the detector image frame is equally divided into n parts, and the distance between the detected infrared heat source and the detector satisfies the formula : [1+(kG/nY) ² ] ^1/2 X, this formula describes the straight-line distance between the thermal image of the infrared source and the detector, and corrects the parameters of the thermal image of the infrared source according to the distance. The correction formula is: {[1+(kG/nY) ² ] ^1/2 XX}, wherein: n-n equal division of the imaging distance from the center G; k-kth equal division of the imaging distance G from the center (starting from the central point); G-the imaging distance from the center; Y-the distance between the photosensitive imaging chip and the central focus of the optical lens group; X-the vertical distance from the optical lens center imaging focus to the ground. Integral method is used to describe the size of the infrared heat source: according to N1+N2+N3..., that is, ∫ ₁ ⁿ N _i mode, where N _i = the area occupied by the infrared heat source in a certain coordinate column=[total coordinate column-(infrared heat source End point coordinates-infrared heat source starting point coordinates)] ^* The area constant corresponding to a single pixel. This method describes the area of the infrared heat source while describing the shape of the infrared heat source. The calculation formula of the actual infrared heat source is: the area of the thermal image of the infrared source on the pixel × the magnification. The pixel area formula is: the length of the center point of the ordinate x the length of the center point of the abscissa.

B. The method after detecting the minimum diameter of the infrared heat source: setting and calibration of the minimum detection diameter of the heat source. Since different monitoring environments have different sensitivities to heat sources, this will have different requirements for heat source monitoring sensitivity. By setting the minimum detection diameter of heat sources, a threshold can be given to the detector. When it is less than the threshold, it will not detect Ignore or just display without alarm. Integral method is used to describe the size of the infrared heat source: according to N1+N2+N3..., that is, ∫ ₁ ⁿ N _i mode, where N _i = the area occupied by the infrared heat source in a certain coordinate column=[total coordinate column-(infrared heat source End point coordinates-infrared heat source starting point coordinates)] ^* The area constant corresponding to a single pixel. This method describes the area of the infrared heat source while describing the shape of the infrared heat source. The calculation formula of the actual infrared heat source is: the area of the thermal image of the infrared source on the pixel × the magnification. The pixel area formula is: the length of the center point of the ordinate x the length of the center point of the abscissa. Set the number of levels not less than 128. This function can classify the detected images, and ignore the images smaller than the set point. The graphic reference data corresponding to the minimum set point is when the 140-degree optical lens is used, and a 10cm diameter image is stored on the CMOS chip at a distance of 25 meters from the lens. The number of pixels corresponding to the above expression is the smallest level, and the target diameter increases by 10cm, and the number increases, and so on.

C. Dynamic minimum coordinate interval setting: When it is necessary to accurately describe the position and size of the infrared heat source, fine coordinates must be used; when it is only necessary to roughly estimate the size and position of the infrared heat source, the coordinate interval can be larger. The former will generate a larger amount of data in actual use, while the latter can complete the description at a faster speed. The present invention uses a dynamic method for coordinate embedding: when the detector does not detect the required infrared heat source, the detector will scan at the minimum coordinate interval, and the detector does not need to transmit data to the outside; when the required infrared heat source is found , the detector will embed the coordinates in such a way that the diameter of the infrared heat source is closest to the coordinate classification interval. When multiple infrared heat sources are found, the infrared heat source will be described in the coordinate interval corresponding to the smallest diameter of the infrared heat source.

D. Heat source position memory and calibration: Usually there will be some fixed infrared heat sources in the industrial environment or civil environment, such as gas stoves, heaters and other devices, these devices will emit infrared heat sources that are close to or consistent with the sensitive wavelength of the detector, in order to distinguish the above For the infrared heat source of the device, we mainly use the method of memory of the fixed infrared heat source device to detect and identify whether it is in normal use; in addition, we use the equivalent analysis method to detect and identify the flowing infrared heat source (such as electric irons, hot pots, etc.) . The main process is to mark and download the infrared heat source position point coordinates and equivalent parameters in the detector monitoring area on the main controller when installing the detector, or turn on the fixed infrared heat source device after the detector is installed, so that the detector can memorize it by itself . The main identification method for mobile infrared heat sources is relatively simple. When an infrared heat source is found while moving, the diameter of the heat source generally does not change, and the temperature changes slowly. When an infrared heat source appears in a non-memory point, it does not produce progressive expansion, and the infrared heat source with a relatively stable calorific value can be defined as an artificial mobile infrared heat source. The memorized fixed infrared heat source device will be written into the image file of the main controller, and modifying the image file of the main controller will change the memory position of the detector for the infrared heat source.

Since CMOS and CCD devices are rarely used as detectors for detecting mid- and near-infrared bands, the application technology and mechanism are explained: usually, CMOS and CCD photosensitive devices are designed to be sensitive to wavelengths exceeding visible light bands, especially at the low end. All can reach or exceed the near-infrared band. For example, common digital video cameras or cameras can take photos in the near-infrared or even mid-infrared bands (using filters to filter out unnecessary bands). Due to different production processes, each company produces The wavelength band that the photosensitive imaging chip can extend in the infrared band is different, but basically they can be extended to the near-infrared band. If it is used as a fire detector, its main detection temperature can be set between 250°C and 350°C Infrared source, the temperature belongs to the temperature of the "simmering" stage, of course, the open flame naturally also includes the infrared spectrum. It can be known from Wien's displacement law that the wavelength of the infrared source between 250°C and 350°C that we need to detect is between 5.6 and 4.5 μm. By detecting and monitoring the infrared heat source in this area, we can speculate whether a fire has occurred.

It is very simple to verify whether CMOS or CCD photosensitive imaging chips can be used to detect light in the near-infrared band. Metals generally emit visible light when they are above 450°C. The temperature of a general electric soldering iron is 210-350°C. As long as the camera is used in a relatively dark environment , digital camera, cat's eye (or mesh, using CMOS as the photosensitive device, using the USB interface to connect to the computer, as a video camera for online visual communication) and other equipment can clearly see the bright image of the electric soldering iron (infrared image), Of course, some high-end cat's eyes or digital cameras can't see infrared images in the above environment. This is generally not because the photosensitive imaging chip can't be sensitive to the near-infrared band, but because the manufacturers of cat's eyes and other equipment want to increase the clarity of the cat's eyes. An infrared filter is added in the middle of the group to filter out information that enters the infrared band; and some CMOS chips have a bandwidth that does not reach the infrared range, so that infrared images cannot be seen. Through testing, the lower limit photosensitive area of various brands of CMOS and CCD photosensitive imaging chips can be extended to close to 6-7 μm, and the lower limit photosensitive area of some black and white CMOS can be extended to 12 μm.

The following embodiment uses the extended photosensitive characteristics of the dot-matrix photosensitive imaging chip in the near-infrared and mid-infrared bands to develop a detector for spatial position detection and positioning of infrared targets in the near-infrared to mid-infrared bands. The detector is mainly used in fire protection, In the environment of technology defense or similar requirements.

Example 2

When the present invention is used as a fire detector, it is allowed to install the detector on an unshielded wall, not necessarily required to be installed on the roof. As shown in Figure 5, this embodiment describes a schematic diagram of the actual application and installation of a fire detector. The fire detector is installed in a corner of a monitored room, and it can be detected very easily through the window at a 145-degree angle of the detector optical lens. For the infrared heat source in the whole room, due to the use of filter technology and the recognition technology for detecting infrared heat source, the detector outputs the diameter and coordinates of the infrared heat source. Through the calibration technology, it can effectively observe all the infrared heat sources within the specified distance and range. In order to improve the detection accuracy, the traditional fire detectors formed by the existing technology must be installed on the top of the room. If it is a temperature sensing type, it can only detect the overall increase of the ambient temperature. If it is a smoke sensing type, it can only detect the detector. Whether the installation point has smoke, no further information can be passed.

Example 3

As shown in Figure 6, when the present embodiment describes that the detector is installed on the top of the room, when the height of the room is approximately equal to 4 meters, the angle of the optical lens group of the detector is 140, and the area that can be monitored at this moment is approximately equal to 256 square meters (the calculation formula is 4tg70°×2 ^1/2 ), the control system can manage the specified space in the area through coordinate management.

Description of the detection process: As shown in Figure 3, adding a filter before or after the optical lens can effectively block the interference source in the non-detection area from entering the detector chip, and only the detected light source within the bandwidth of the filter can pass through the filter- The optical lens group reaches the detector chip. Since most of the interference sources have been filtered by filters, only a small amount of interference light sources enter the detector chip along with the detected light source, and then are received by the DSP processor. Compared with the interference source, the signal source It is stronger than the interference source, so there will be a signal strength difference with the interference source. The DSP processor only needs to identify the limited interference source to identify the detected signal very clearly. Among them, the optical lens group is made of materials that can pass through mid-infrared light. Generally, materials with low infrared light resistance such as ruby and germanium are used. When used in convertible detectors, the optical lens group adopts broadband optical lens group. , Change the purpose of use by changing the filter. When the scope of use is confirmed (fixed use), the film can be directly applied to the optical lens group to fix the filter wavelength and bandwidth.

Claims (5)

1. A method for detecting thermal images of infrared sources, which uses a detector that includes a dot matrix photosensitive imaging chip and filters of different wavelengths selected according to needs to detect specific wavelengths, characterized in that the detection The device is combined with an optical lens in front of the dot-matrix photosensitive imaging chip. The output end of the dot-matrix photosensitive imaging chip is connected to the main controller. The main controller scans the infrared source thermal image on the dot-matrix photosensitive imaging chip and converts The bright spots are recorded, and different brightness levels correspond to different temperature levels. The optical lens combination includes a combination of an optical imaging lens and a filter or an optical imaging lens that also functions as a filter. The filters of different wavelengths are used for The 0.78-8.5μm wavelength filter for fire detectors or the 8.5-12μm wavelength filter for technical defense detectors describe the thermal image measurement diameter and embedded coordinates of infrared sources. The coordinates are embedded in a dynamic way, and the basic coordinate interval is set to definite Interval, the detector measures the diameter from the end coordinates to the starting coordinates after detecting the thermal image of the infrared source. When multiple thermal images of the infrared source are found, describe the infrared heat source with the coordinate interval corresponding to the smallest diameter of the infrared heat source, and change the coordinates When the parameter is set, the transmission signal automatically loads the changed coordinate interval data to the main controller. 2. A method for detecting thermal images of infrared sources according to claim 1, characterized in that by presetting the main controller in the detector or setting the environmental infrared source data on site, the detector can "remember "Preset the coordinates and diameters of the normal infrared heat sources that already exist in the monitored area. The method is: 1. Mark the position of the infrared heat source on the coordinates in the main controller and download it to the detector. When detecting When the detector finds the thermal image of the infrared source on site, it will compare the comparison parameter database in the memory, and the thermal image of the infrared source that does not match the content in the database will be uploaded to the main controller as dangerous information through the transmission interface. When the marked coordinates and diameters match, no response will be made; 2. When it is in the debugging stage or "knowledge" stage, the detector will transfer and store the on-site infrared heat source and coordinates to the memory, and the detector will memorize the above parameters and mark them The above-mentioned infrared heat sources are normal information sources. 3. A method for detecting thermal images of infrared sources according to claim 1 or 2, characterized in that the monitoring range is delineated by marking the monitoring area, and by setting the time window method in different time periods It is stipulated that the detector completes different monitoring areas, and the implementation method is as follows: 1. When the detector communicates with the main controller regularly, it will obtain real-time time, and query the database corresponding to different times according to the time, so as to know the monitoring areas at different times; 2. Permanently set some unmanaged monitoring areas, and the infrared heat sources found by the detectors in the monitoring areas will not be accepted. 4. A method for detecting the thermal image of an infrared source according to claim 1 or 2, characterized in that the detector uses an equivalent method to describe the power of the infrared heat source, and the detector measures the diameter, area and temperature of the infrared heat source, and the The data obtained by multiplying represents the heat source power equivalent. 5. A method for detecting infrared heat source thermal images according to claim 3, characterized in that the detector uses an equivalent method to describe the power of the infrared heat source, and the detector measures the diameter, area and temperature of the infrared heat source, and multiplies them The obtained data represent the heat source power equivalent.

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