Wednesday, 3 September 2014

WG520 Flu Fever Screening Detection System

The portable WG520 Flu Fever Screening Detection System identifies persons who may be suffering from Ebola, common influenza, SARS and other flu variants such as Avian flu, Bird and Swine flu etc.

The typical symptoms of influenza are fever, coughing, sore throat, body aches and an increased body temperature.

The portable WG520 Flu Fever Screening Detection System identifies when a persons body temperature exceeds a predetermined threshold.

Applications

  • Fever detection at Airports;
  • Fever detection at Sea Ports;
  • Fever detection at Borders;
  • Public mass fever detection screening.

Flu Fever Screening Detection System

Features

  • Deployment of Flu Fever Detection SystemThe software controls and buttons can be shown in any language;
  • Real-time screening means no need for queues;
  • Simple user interface allows anyone to quickly become proficient at operating the system;
  • Visible and audible alarms permit fast identification of alarm sources;
  • Stable calibration over ambient temperature changes ensures excellent measurement repeatability;
  • User can configure software as desired through a password protected graphical interface;
  • Alarm threshold can be adjusted manually or automatically.
  • Optimised frame rate of 7.5 fps giving temperature sensitivity of 0.01°c and increased accuracy, Additional frame rates available: 30 frames per second, 60 frames per second (special quote);
  • Easy to use software with auto ambient correction and Auto averaging of individual persons gives better accuracy with less false positives and false negatives while proprietary threshold fever alarm (audio and visual) reduces the operator training time to one hour

Operation

  • Operation of Flu Fever WG520 Detection SystemThe system is totally portable;
  • It can be set up and working within 3 minutes;
  • The system monitors individual persons temperatures;
  • It displays thermal images and will give an alarm when a temperature exceeds the chosen threshold;
  • The temperature alarm threshold can be set to automatic mode or manual mode to accommodate the operator's preference;
  • The camera operates at real-time update rates, and displays images in colour on a flat panel display;
  • Temperature resolution is <0.25°C;
  • The camera is compact and rugged;
  • The system is designed to operate 24/7;
  • If needed, a weatherproof option is available.
  • The system is easy to use allowing non-technical users to operate.

WG520 Flu Fever Detection System Screen 1

WG520 Flu Fever Detection System Screen 2

 

Technical Specifications

Imaging Performance
Temperature range:10º C to 50º C (50ºF to 122ºF)
Measurement accuracy:1.2%
Stability:
(after 1 minute warm-up)
<0.3º C drift over the temp. range 18ºC to 30º C
(< 0.5º F drift over the temp. range 64ºF to 86ºF)
Ambient correction:Automatic

 

Detector
Focal Plane Array:Amorphous Silicon micro bolometer
Pixels:160 x 120; Interpolated to 320 x 240
Spectral Response:7-14 microns
Thermal Sensitivity:0.1º C @ 30º C (0.2º F @ 86º F)

 

Display
Dynamic range:16bit
Displayed image:8bit
Display colour:Select from 5 colour- maps provided, or create a custom colour-map.
ISO band display:Automatically set to selected threshold temperature.

 

Power Requirements
Power Source:95-225 VAC, 45-65 Hz
Battery/external DC option:6-32 VDC, minimum of 3 Watts continuous, 1 Ampere for a short time at start-up.

 

Environmental Characteristics
Operating Temperature:0º C to 60º C (32º F to 140º F)
Storage Temperature:-40º C to 80º C (-40º F to 176º F)

 

Physical Characterisitics
Enclosure:EMI Shielded
Overall Dimensions:12cm x 19cm x 14cm (4.7" x 7.5" x 5.5"), (HxWxD)
Weight of Camera:1.7kg (3.7 lbs)
Weight of Camera Stand:11kg (24 lbs)

 

Calibration
Recommended Interval:0º C to 60º C (32º F to 140º F)
  

 

Optics
Focal Length:25mm (1")
Fields of View:17º H x 12º V
Focus Range:1m to infinity (39" to infinity)

 

Standard Accessories
Computer:Desktop or mini tower PC.
Display:15" flat panel touch-screen LCD.
Software:Full featured with threshold detection, data logging, camera control.
Cables:Automatic
Camera stand:Roll-about stand included.

Choosing the Right System

Industrial cameras have a wide range of temperature measurement and as a consequence the sensitivity and accuracy is also spread over a wide range.

A medical camera like the WG520 system has a very narrow range of detection (within the range of human physiology) and so our sensitivity and accuracy is concentrated in this narrow range of IR emissivity and temperature, which provides higher sensitivity and easier protocols which are not as affected by the outside environmental factors as an industrial camera will be (because of the wide range detected in all industrial applications, emissivity from electrical equipment, lighting, reflective surfaces, sunlight, and other IR sources in the immediate area will affect the results and require the operator to be very skilled as a thermography technician).

This system is designed and built specifically for clinical use and the detection of physiological IR.

Industrial cameras have many features and functions that are irrelevant to medical applications and actually work against the sensitivity and objectivity of results.

Many of these features like edge enhancement, auto averaging and emissivity correction have to be disabled before the camera can be used for applications like fever screening.

Many industrial cameras without internal temperature reference calibration require an additional external black body calibration unit (at extra cost).

All industrial cameras have a 'lens correction' built in, this is because they use actual lenses (just like normal cameras) to focus and zoom. (in industrial applications they have to look at objects at all distances from very close to very far away) the industrial camera lens will absorb about 17% of the emitted radiation (IR) so this needs to be corrected for by the software.

The WG520 camera does not use standard camera lens, so there is no loss of signal from the object emitting the radiation. It uses a small germanium window which does not absorb measurable amounts of the emitted radiation, so we are detecting close to 100% of the IR being emitted from the human body. (no lens correction = better accuracy).

Industrial cameras all have a % of thermal drift, which they use software 'averaging' to compensate for. This does not make much difference to most industrial applications but it is very important when using thermography for clinical applications.

The only way to counter the problems of thermal drift is to have a reference temperature; industrial cameras do not have a stable reference temperature point.

All industrial cameras being used in airports for fever screening should have an outside temperature reference source (black body emitter or calibration emitter) that is seen within each view. (basically an accurate temperature that can be seen by the camera and used to calibrate each frame)

The WG520 uses proprietary technology which gives us an internal reference temperature accurate to 1/100th °C. This handles any thermal drift and calibrates the results on a frame by frame basis End result: more stable results, repeatability, better accuracy and less need to continually alter the range and scale of detection like the industrial cameras which give higher percentages of false positive and false negative results and demand a higher level of training to be operated efficiently.

The WG520 software has developed from over 20 years of medical research and is specific to the application of mass screening for physiological abnormality.

Industrial camera software has been adapted (at best) for fever screening from the industrial application software which is in most instances not suitable or easy to use by untrained operators.

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