Forest Fire Detection Thermal Cameras
Thermal cameras detect fire by the object infrared radiation energy...
Why thermal imaging camera could detect fire in the forest?
Thermal cameras detect fire by the object infrared radiation energy, after being processed by the system, it is transformed into a thermal image of the target object, which is displayed in grayscale or pseudo-color, and the temperature distribution of the measured target is obtained to judge the state of the object.
The background temperature of the forest area is generally -40 ℃ ~ 60 ℃, and the temperature of the combustible flame is generally 600 ℃ ~ 1200 ℃. The temperature difference between the two is large, and the contrast is obvious in the image. In addition, we have carried out algorithm processing such as image enhancement, image correction, filtering, etc. on the thermal image, and obtained a clear and real-time image.
Therefore, based on the infrared radiation of fire, thermal images can easily separate the combustion of combustibles from the terrain background.
How does the fire detection camera works?
The forest fire detection system integrates thermal imaging camera, visible light camera as well as high precision pan tilt. Pantilt angle 360° horizontal, ±45° vertical, no blind area scanning.
Set presets and scan route, camera will auto scan the setting area, 24*7 continuous monitoring.
Transmission and control is via RJ45 port(network), user could either use network cable or use *Wireless Netbridge for the area where network is unavailable.
Control center could be at the edge of the forest. When fire detected, there will be pop-up window and alarm on the software interface.
* Wireless Netbridge could reach 10-15km for transmission. It is usually one pair, one for transmit, the other for receive. It requires there is no obstacles among the transmitter and receiver, otherwise, the signal would be shield. It is advised that one on the top tower next camera, other on the outside of control room.
Relationship Between Alarm Distance & Thermal Camera Focal Length
| Fire Alarm Distance & Lens | ||||||
| Lens | 100mm | 150mm | 180mm | |||
| Zoom | 25-100mm, 4x | 30-150mm, 5x | 36-180mm, 5x | |||
| FOV | 4.6°× 3.7°~18.2°×14.6° | 4.2°× 3.1° ~ 20.6°×15.5° | 3.5°× 2.6° ~ 17.2°×12.9° | |||
| Fire Source | 1m x 1m | 2m x 2m | 1m x 1m | 2m x 2m | 1m x 1m | 2m x 2m |
| Alarm Distance | 2000m | 4000m | 3000m | 6000m | 3600m | 7200m |
| * Note: Bigger lens is not recommended. (Bigger lens could reach longer alarm distance, but it takes more time for scanning the whole area, making it slower to detect fire in the area. For longer range, we recommend more cameras to cover.) |
Visible Light Camera
Visible light camera works as supplement to thermal imaging camera. As it is mentioned above, thermal camera works based on the infrared radiation of fire. However, it could not monitor the ignition points that cannot be seen directly by themral imaging, such as the fire source in the col and the back mountain.
With visible light, smoke could be easily discovered to find early fire in time of the col and back mountain.
What focal length should be choose? We have visible light camera as following:
- Day vision 1-2km: 4.3-129mm, 30× optical zoom
- Day vision 2-3km: 8-320mm, 40× optical zoom
- Day vision 3-4km: 15.6-500mm, 32× optical zoom
- Day vision 6-8km: 12.5-750mm, 60× optical zoom
Recommend Configurations
After reading “Relationship Between Alarm Distance & Thermal Camera Focal Length”, you may have a general understanding of the camera focal length that we recommend.
On thermal part, we recommend 100/150/180mm thermal lens with detector 640×512 resolution.
On visible light part, above lens could be chosen to match the thermal part. For example, if you require 2km fire detection, you choose 100mm thermal lens, then you may choose 4.3-129mm/8-320mm visible lens.
As a result, here are some typically configuration for choice:
- SHR-HLVHGIR104R —— Thermal: 25-100mm; Visible: 4.3-129mm
- SHR-HLV1020GIR104R —— Thermal: 25-100mm; Visible: 8-320mm
- SHR-HLV1520GIR155R —— Thermal: 30-150mm; Visible: 15.6-500mm
- SHR-HLV3020GIR185R —— Thermal: 36-180mm; Visible: 12.5-750mm
Intelligent Software
We offer software for camera control and alarm.
