Dahua BF Series, Руководство по установке и пусконаладке

Страница: 16 / 17

13
4
FAQ
1. What is blackbody? What is the role? Do you need a physical connection to the camera?
Blackbody can be simply understood as a constant temperature reference source (constant temperature can
be maintained after power on). When testing human body temperature, blackbody is generally set at 35
℃
,
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