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The CF320B fever screening camera released in the 2nd half 2020 is designed to minimize the influence of the surrounding environment in temperature measurement, such as changes in the temperature and wind, by installing a black body about 3 meters in front of the camera.
COX's adopted thermal camera is an analogue thermal camera that transmits full pixel temperature raw data over an Ethernet port instead of a thermal network camera, unlike other Chinese companies. The thermal network camera compresses thermal video and transmits compressed video data and additionally sends only a few pixels of temperature data uncompressed, so it only send maximum temperatures in the face detection area processed by the camera itself, without any constant on-site calibration as analogue camera can do, which naturally reduces the accuracy of the temperature measurement.
However, what COX adopted is that the thermal camera transmits only the temperature raw data of the entire pixels measured by the camera and the PC program running on the PC processes the received temperature raw data to produce thermal images and also obtain the temperature value of each pixel. PC’s processing capability is much greater than that of a thermal camera, so PC software can additionally calibrate the temperature value obtained by processing received temperature raw data from the camera based on the black body's 40 ℃ temperature, and it can also be calibrated by distance between people and cameras.
In conclusion, additional calibration based on 40℃ blackbody and distance between people and camera, CF320B adopted, offers more accuracy in face temperature measurement of fever screening camera.
1) Thermal camera: 384x288 pixels micro-bolometer thermal sensor camera
2) LED strobe: LED strobe on camera flashes when a person above alarm temperature is detected
3) Visible camera: 2MP USB interface camera
4) Blackbody: Set at 40℃ before delivery
5) Tripods(2 for camera and blackbody)
6) PC(In most cases, customers prepare lap-top PC)
7) Accessories(adaptor and user manual)
When measuring the face temperature of a person moving with only a thermal camera, there is a weakness that the measured value can rise or fall if conditions such as temperature or wind change where the camera is installed. To improve this problem, CF320B added a blackbody to the product configuration, and in fact, it also added a visible camera to make it easy to distinguish who passed in front of the camera by video.
The black body is an equipment designed to emit a constant 40℃ infrared light even when the external environment, such as temperature or wind, changes. The black body installed face-to-face about 3m away from the camera, and the PC program checks whether the black body part temperature measured by the camera is 40℃ or how much higher or lower than 40℃, and PC program calibrates the difference when it outputs measured temperature.
Since the PC program calibrates based on the blackbody temperature of 40 ℃ and then outputs the measurement temperature, the temperature of the face output by the fever screening camera is always consistent and accurate. If you are using a fever screening camera CG320B that includes CB55 black body provided by COX, you can measure the temperature with an accuracy of +/-0.2℃.
|Sensor||Micro-bolometer||Uncooled focal plane array|
|Resolution||384 x 288|
|Response wavelength||8µm to 14µm|
|Thermal sensitivity||50mK@f1.0, 30Hz, 300K|
|Lens||Lens type||Athermalized lens|
|Focal length||8.13mm f1.16|
|Recommended distance range for best reliable measurement||2m to 3m|
|Minimum focus distance||0.5m|
|Data output||Interface||Giga Ethernet(10/100)|
|Data||Temperature raw data of each pixel of thermal sensor|
|Sensor||Image sensor||1/3” Progressive CMOS (Approx. 2.1 mega)|
|Scanning system||16:9 Progressive|
|Effective Pixel||1920(H) x 1080(V)|
|Min. Illumination||0.2Lux (Day), 0.1Lux (Night)|
|Lens||Optic||4mm 70° HFOV|
|Function||Back Light Comp.||WDR/BLC|
|Exposure||Auto / Manual|
|White Balance||Auto(3,000°K~8,000°K) / Manual|
|Day & Night System||AGC / TDN(ICR)|
|Electronic Shutter||1/1 ~ 1/30000|
|Functions||Brightness, Contrast, Hue, Saturation, 3DNR, Flicker-less, Sharpness, Gamma, Digital-Zoom|
|Video output||Interface||USB3.0 Super Speed(Standard length of USB cable is 2m/If required, repeater cable of 15(20)m in length will be included in the package as an option, in case distance from the camera to the PC is up to 17(22)m)|
|Format||USB3.0 UVC compliant YUV 422 16bits, uncompressed video|
|Resolution and Frame Rate||1920x1080p@50/60/25/30
|Control interface||USB||UVC camera control by computer|
|Operation||Weight||1Kg(including USB cable from the visible camera)|
|Dimension||81(H)mm x 135(W)mm x 150.5(D)mm|
|Power supply||110/220 VAC to 12VDC adaptor 36W(3A), straight jack|
(visible & thermal camera)
|-10℃ ~ 40℃|
|Blackbody||Fixed temperature set at the factory||40℃|
|Effective radiant surface||Ф55|
|Temperature sensor||NTC 0.1%|
|Power supply||110/220 VAC to 12VDC adaptor 36W(3A), 90° angle jack|
|Dimension||72(H)mm x 72(W)mm x 49(D)mm|
|Recommended distance from the camera||Between 2m to 3m(install blackbody at the point 2m to 3m apart from the camera/on the tripod, on the wall, or on the ceiling/ The temperature of the moment a person passes just by the blackbody is the most accurate)|
|Operation Temperature||-10℃ ~ 40℃ under 80% humidity|