FREQUENTLY ASKED QUESTION
WHAT IS THE ADVANTAGE OF ACTIVE INFRARED NIHGT VISION OVER THERMAL CAMERAS?
Thermal Cameras show a kind of thermal map. The scene is defined by temperature differences. It is not possible to identify persons by the wiev taken by this method. Besides this a lot of details (e.g. road lanes) can not be seen by thermal cameras. At night vision provided by UNIVERSAL INFRARED ILLUMINATORS all details can be seen and human beings and animals can be identified very clearly.
HOW DO INFRARED ILLUMINATORS PROVIDE NIGHT VISION?
Human eye can perceive wavelegths between 400 – 700 nanometers (nm) . But CCD cameras can perceive wavelengths up to 1000 nm. UNIVERSAL INFRARED ILLUMINATORS illuminate the scene at a wavelength which is outside the human eye perception limits but inside the perception limits of the CCD cameras. In this way while human eye can not see anything at absolute darkness, crystal clear vision can be obtained by the CCD camera supported by UNIVERSAL INFRARED ILLUMINATORS.
WHAT ARE THE PERCEPTION LIMITS OF THE HUMAN EYE?
Human eye can perceive wavelengths from 400nm to 700 nm. This corresponds as color from violet to red.
FROM RED TO VIOLET THE VISIBLE RANGE
Graphical Expressions of Human Eye - CCD Cameras and Sun Emission
DO EVERY CCD CAMERA PERCEIVE INFRARED?
Only Black&White cameras and Day/ Night cameras can perceive infrared. Color cameras can not perceive infrared because of the “infrared cut filter” used infront of their sensors.. Day/Night cameras give color picture during daytime and when the light level decreases they automatically change over theirfilter and switch to (monochrome) black&white mode during night time and start to perceive infrared. This feature is called ICR (Infrared Cutfilter Removal). There are also some simple CCTV cameras with ir LEDs around their lenses. Such cameras generally are not equipped with Infrared Cut Filter. Therefore such cameras are also sensitive to infrared. Although these cameras have ir leds, their night vision range is rather low, they require the support of an ir illuminator for a long range, homogenous and clear night vision.
WHAT IS THE INFRARED EXPERIENCE OF UNIVERSAL?
UNIVERSAL has imported infrared illuminators from Europe since 1989 and used them in several facilities for night vision. Since 1998 UNIVERSAL has developed his own Infrared Illuminators using semiconductor (LED) technology. Infrared Illuminators produced by UNIVERSAL have been widely used all over Turkey, at Military and Security Forces premises as well as several governmental and private complexes. mini robust UNI 100 and UNI 200 models have been designed and produced for safe and long life operation at heavy duty conditions.
WHAT ARE THE BASIC FEATURES OF mini robust UNI 100 and UNI 200 MODELS?
- Highest protection against dust and water IP68.
- Highest resistance against impaccts IK10.
- ElectroMagnetic Compatibility (EMC compliant)
- UV resistant
- Stainless steel metal accessories
- 850nm, 940nm, 980nm wavelength options
- Very high infrared power by very low consumption
- 220VAC or 48VDC or 24VDC operation voltage options
- Automatic day/night operation by photocell switch
- 20+ years foreseen life span
- 5 years warranty at fixed land installations
- Quality certificates by independeny bodies
You can reach the certificates of independent bodies at Documets / Product Quality Certificates sections of our website.
ARE UNIVERSAL INFRARED ILLUMUNATORS BEING USED AT MILITARY APPLICATIONS?
Yes, they are used at very special applications under heaviest conditions. Information about such projects do not take place at our website. In case you have a military application, we can communicate.
CAN UNIVERSAL IR ILLUMINATORS BE USED AT MEDIA CARRIYING RISK OF EXPLOSION?
Yes, our mini robust model has an ex-proof ZONE-2 version which can be used at media having Zone-2 properties.
ARE IR ILLUMINATORS USED AT INDOOR LOCATIONS?
Yes, especially at facilities like museums, bank branches, factories, warehouses, supermakets, ….indoor ir illuminators are used to have long range, homogenous night vision. Our micro indoor model which has miniature and aesthetic shape and can provide excellent night vision at indoor locations.
MAY INFRARED ILLUMINATORS BE HARMFULL FOR EYES?
When human eye is subject to strong visible light there are several protections. Immediate decrase at the pupil diameter, reflex of blink and even covering the eye by hand. On the other hand since Human eye does not react to infrared since it can not perceive the infrared. At very close distances to the infrared illuminators intense infrared radiation may cause demage to the human eye. This demage risk is valid any brand of infrared illuminators. For this reason especially the persons who may work at close distances to the infrared illuminators need to be trained about the danger to the eyes. While working at very close distance to the infrared illuminators must be switched off. Using protective special infrared blocking eye wear may be another solution. Please apply to UNIVERSAL for the specification of protective eye wear. Please note that sun glasses have no protection against intense infrared.
ARE UNIVERSAL INFRARED ILLUMINATORS ENVIRONMENT FRIENDLY?
Yes, they prevent light pollution. In addition their electrical consumption is very low. In traffic applications they prevent eye blending and consequent accidents.
CAN IMAGES BE STORED FOR LONGER PERIODS, WHEN UNIVERSAL IR ILLUMINATORS ARE USED?
If the scene is not homogenous and well illuminated, the snowy images occupy more capacity at the harddisc. Since UNIVERSAL INFRARED ILLUMINATORS provide a homogenous and clear night vision, images can be stored for much longer periods at the same harddisc capacity.
WHAT LOWERS THE RANGE OF INFRARED ILLUMINATORS?
Light sources inside the scene (flodlights, car headlights) or a very close object (e.g. a tree or a building wall) that is not the main monitored subject may reflect the IR light and cause a closing of the camera iris. This would decrease the effectieness of the IR ILLUMINATOR. Therefore closeby reflecting surfaces, and floodlights at the scene should, if possible, not be included in the scene viewed by the camera.
WHAT IS THE DIFFERENCE BETWEEN 850nm and 940nm ILLUMINATORS?
Night vision by 850 nm waevlength is more effective, the range is longer. Because CCD cameras are more sensitive at 850nm. But at this wavelength faintly reddish color can be noticed at the glass surface of the illuminator. For that reason 850nm illuminaton is generally called as semicovert illumination. Since this is not a problem at several applications such as city surveillance, plate recognition systems, perimeter systems, 850 nm is preferred due to its efficiency. In case of fully covert application 940nm illumination is used. This wavelength of illumination is not noticable at all. 940nm infrared illumination is unevitable for some military aplications and some departments of the security forces. The ranges obtained at 940nm are half the ranges obtained at 850nm.
WHAT IS THE RELATION OF RANGE AND THE ANGLE?
Range is inversly proportional to angle. If angle decreases range increases.
WHAT IS THE DIFFERENCE BETWEEN 850nm and 940nm ILLUMINATORS?
Night vision by 850 nm waevlength is more effective, the range is longer. Because CCD cameras are more sensitive at 850nm. But at this wavelength faintly reddish color can be noticed at the glass surface of the illuminator. For that reason 850nm illuminaton is generally called as semicovert illumination. Since this is not a problem at several applications such as city surveillance, plate recognition systems, perimeter systems, 850 nm is preferred due to its efficiency. In case of fully covert application 940nm illumination is used. This wavelength of illumination is not noticable at 120 degree radiation angle and less noticable at lower radiation angles. 940nm infrared illumination is unevitable for some military aplications and some departments of the security forces. The ranges obtained at 940nm are a bit shorter than the ranges obtained at 850nm. Because cameras are more sensitive at 850 nm. This can be noticed from the below graphic showing the SPECTRAL RESPONSE of a camera
WHAT ARE THE RADIATION ANGLES OF UNI INFRARED ILLUMINATORS?
Standard radiation angles are 25⁰, 45⁰, 90⁰ and 120⁰.
HOW SHOULD WE SELECT THE ANGLE OF THE IR ILLUMINATOR?
For fixed cameras the angles should be selected according the approximate angle of the camera. For speed domes generally 120⁰ radiation angle is preferred. By using 3 ir illuminators a night vision of 360⁰ can be achieved.
WHAT ARE IN GENERAL THE APPLICATION AREAS OF INFRARED ILLUMINATORS?
In general Surveillance Systems, Car Plate Recognition, Driver identification, Public Transportation Vehicles, Money Transportation Vehicles, Sea Vehicles and Military Vehicles, Image Processing and Video Analysis Systems, ……….