14
which is used for temperature correction of thermal imaging acquisition, so as to meet the accuracy
requirements of
±
0.3
℃
.
Bold doesn't need to be connected to the camera, it's separate. After power on, it can be placed in the camera
screen according to the installation instructions.
2. Power on stabilization time of equipment.
Blackbody: power on and preheat for 20 minutes; thermal imaging equipment: power on and preheat for 60
minutes, with the best effect.
3. Whether it can be installed in outdoor or semi outdoor environment.
Because the outdoor temperature, wind, humidity and other environmental factors have a great impact on the
temperature measurement of the thermal imaging surface, it is not recommended to be installed outdoors or
in the area directly connected to the outdoor, but in a closed and relatively stable environment without wind.
4. Why is it recommended to measure the temperature of frontal forehead?
First of all, different people's forehead temperature also has temperature difference. In the case of mask, the
exposed area of forehead is relatively large, which is more convenient for temperature measurement.
The actual temperature of the front face and the side face of the same person / same position is different. With
masks, the high temperature points are mainly in the forehead, ears and neck, and the temperature is different
among different people. Therefore, it is required to face the camera and test the frontal temperature uniformly
to reduce the impact of temperature difference between different parts.
5. What is the best temperature range for temperature measurement?
The best temperature range of indoor wind free and stable environment is 10
℃
~ 30
℃
6. The best distance for temperature measurement?
The best temperature measurement distance is the same as the distance between blackbody and equipment.
3.5mm detection distance is 2m, and the transverse width of 2m is about 1.5m; 7mm detection distance is
3m, and the transverse width of 3m is about 1.3m; the temperature measurement value far from the optimal
distance will be reduced, and the temperature measurement value close to the optimal distance will be
increased.
7. How many heads can be tested?
As shown in the figure below, in normal use, there are not many people (width 1.3-1.5m) at the best distance
of temperature measurement. There is no limit to the number of heads in the detection area, but it is too far
or there is overlap, which may result in missing or inaccurate temperature measurement. It is recommended
to test one by one.
8. Why does the image of thermal imaging channel get stuck after a period of time? Is it normal?
Normal. In order to ensure image uniformity and temperature measurement accuracy, thermal imaging needs
a period of time to set the blank back to zero for correction. During the process of setting the blank, the image
will get stuck once, and the internal part of the equipment will "click" once, which is a normal situation.
9. Why thermal imaging does not measure temperature after the first configuration
The system time is not synchronized, refer to the time synchronization setting in system debugging.
10. Why is the head frame inaccurate?
It may be related to the installation angle and environmental background on site. If the head detection effect
is not ideal, please provide the Dav video with two channels on site. Send Xu Fangrong and Fang Shengdong
through Dahua interactive platform (select intranet Download for outgoing type). After receiving the video,
the R & D will optimize and iterate according to the scene.