Wondering if you are following our last article of the Thermal Principles introduction? In this passage, we would like to continue discussing about it.
The thermal cameras are designed based on the principle of infrared radiation, the infrared camera uses the human body as the radiation source and adopts an infrared detector to capture the infrared radiation energy which emitted by the object. The infrared radiation emitted from the surface of a spatial object is represented in different colour scales and transformed into a visual and quantifiable Pseudo-Colour heat map, with bright tones indicating high temperatures and dark tones indicating low temperatures, making the infrared heat map more intuitive and easier to interpret.
Thermal imaging is also a type of night vision device but there is much difference between thermal imaging and normal night vision! Thermal imaging is based on the passive reception of infrared energy that is radiated by everything above absolute zero! Depending on the temperature of the object, the intensity of the radiation varies and the detected infrared is defined. There are many different display modes, including the common pseudo-colour like black hot, white hot, etc.
Thermal imaging camera lenses are usually made of germanium glass, this material has a high refraction coefficient, which goes transparent to infrared light only, making Germanium great matter for thermal lens.
Although the reserves containing this element are not low in nature, it is very difficult to extract germanium at high concentrations. As a result, the production cost of high precision thermal lens with be higher.
It’s application: Robots, Transformer station/Power transformer, High-voltage Switchgear, Control Room, Military, Mechanical, Petroleum and Chemical Industry, Flammable materials, Fire Industry, Safe Production, Safe production, Metallurgy.
The most important, is it’s Security Surveillance Usage. For the ability that thermal imaging cameras could capture targets in complete dark situation without any illumination, without the influence of rain, fog, snow, fog, which make the camera more reliable on border defence and military applications(Land, air and ocean, all fields available).
Getting the best image details and optimal intrusion detection in challenging imaging environments provides an undeniable tactical advantage to maximize operational effectiveness respond quickly and stay safe for security professionals, making it the ideal choice for national defense industry and law enforcement department.
Infrared imaging makes those hide in shadows and bushes that trying to camouflage themselves become clearly visible on a thermal image.
There is something to notice in the Detecting Distance:
The Range Ability of detection:
There are some important elements to measure the capacity of thermal imaging cameras(There is no clear distinction between the importance of multiple factors, and they will interact with each other. Hopefully it could help making decisions on thermal specs):
1.Object Size
The establishment of the target, is the basis for the selection of image elements, like pixels and other specifications.
For the detection of larger objects at moderate distances, the use of low resolution thermal imaging cameras could meet basic needs. For more specific data, it may require more detailed target size, like 6m*1.8m; Or one of the main types to be detected, like human, vehicle, boat or plants, etc.
2.Resolution
The size of the imaging area and target will determine the required resolution.
High resolution of 1280x1024 thermal cameras are able to serve in various lens nowdays.
Besides that, 640x512 could also be an indispensable choice for common use.
3.Lens
A.Light weight fixed lens like 25/35mm thermal modules (Athermalized Lens)
B.50/75/100/150mm Motor Lens of low distortions
C.25-100 / 20-100 / 30-150 / 25-225 / 37.5-300mm Long Range Motorized lens
4.Pixel Size
17μm→12μm
With increased sight distance and better imaging, and that the smaller the image element size of the detector, the smaller the overall size will be, which will make the shorter lens needed for detecting the same target.
12μm: https://www.savgood.com/12um-12801024-thermal/
There are many different models of thermal imaging cameras available and sometimes choosing the right one could seem difficult. Evaluating the above camera element listed above may better help to find tips.
Post time:Nov-24-2021