Solutions

We can supply a complete range of infra red and white light LED lighting products specifically designed for the CCTV industry. All illuminators are high efficiency which means they provide savings on running and maintenance costs compared to traditional bulb based illuminators. In addition, all illuminators are vandal resistant as standard and covered with a 5 year warranty.

 

The Infra Red illuminators are designed to work in conjunction with B&W or Day and Night Cameras providing a light invisible to the human eye but fully visible to the CCTV camera. They pick up images clearly without attracting attention to the camera as there’s normally nothing more than a very dim glow on the unit.


• Invisible to the human eye (apart from faint glow on unit itself)
• No light pollution
• Long distance illumination
• Designed for CCTV/Surveillance applications
• Low running costs
• Optimise camera performance

 

1. Use black and white cameras, color cameras or special transformed ordinary colour cameras CCD image sensors have very wide spectral range photosensitive, the photosensitive spectrum includes not only the visible area, but also extended to the infrared area. To use  this feature, the camera could be use under  invisible conditions at night, and the infrared illuminator will support the CCD image sensor to get  clear image. Ordinary colour cameras can transmit colour signal from the CCD output signal devices separate from the three green-blue-red base color video signals, and then synthetic colour television signals. The photosensitive can only be installed in the visible spectral region, if it is possible to achieve the transformation of its infrared light region sensory functions through its CCD infrared filtering glass, the front infrared can penetrate into the 850nm infrared filtering glass or without infrared filtering glass.

(attention! Without infrared filtering glass color change may lead to cameras.)

 

With the advances of technology, the current market colour day and night conversion camera is used a cut-over two CCD or a CCD digital

circuits used for the cut over, but the existence of black and white illumination is higher, some of the shortcomings effects of colour will

gradually be eliminated. The infrared sensitive of Low intensity colour and infrared camera is four times higher than normal camera.  With the tend of lower costs,  it will become the trend.

 

2. To select an 850nm infrared camera with low intensity respondent. Low intensity means that  the optical brightness degree when the light

of sence and the video signal output electricity balance of the camera reach a special low range. To measure the parameters should specified the size of the camera's aperture F. For example, using a F1.2 lens when the illumination is 0.02Lux, the scope of the video camera output signal is 50%-33% of  the standard scope 700mv, we say that the camera with the low illuminance of  0.02Lx/F1.2. Some camera manufacturers give different aperture F, the lowest illuminance. When the low illuminance of the camera is higher than infrared illuminator requested, the effective distance infrared lights will be affected. Users should be reminded that the sale of camera technology in market marked the low illuminance with two unnormal ways, one is that the camera manufacturers marked the low illuminance target surface, which is the illuminance of CCD image sensor, and it features with low illumination more than 10 times more than the scenery; Another one is the false illuminance quoted by some camera manufacturers or distributor. Currently, some economical black and white video cameras have the low illuminance of  0.01~0.02Lx, but in fact 0.1~0.2Lx only. If the infrared illuminator require a camera with 0.02Lx, it will affect the effective irradiation distance, and purchase a 0.02Lux camera will need twice cost of a 0.1~0.2Lx cameras. In this case there are

two options, to spend more money in camera, but less in infrared illuminator; or on the contrary. Experimental verification that the former

option is more economical for outdoor long distance.

 

3.The size and specifications of CCD camera

The size of a CCD camera is becoming smaller, and in the current market there are 1/2 ", 1/3 ", 1/4 " CCD cameras. The bigger size of the

camera, the more transmition of light. For example, the effective infrared lights distance is tested with the 1/2 " CCD camera, if you use 1/3 " CCD or 1/4 " CCD camera, the distance will be effective. The light transmition of 1/3 " CCD camera is only 44% of the 1/2 "CCD camera. Choose colour black and white clock automatic conversion should particular paying attention to the selection of the camera with 1/3 " CCD, because tmost camera in the market is with 1/4" CCD.

 

4. Selection of lens

The smaller of the aperture F of the lens, the greater the effects footage - ray hole.

 

5. The required functions of cameras and lens

With automatic electronic shutter function, AGC functions, and automatic aperture of the lens, the cameras can accommodate large range of illuminance changes in day and night.

 

6. Power supply

Fronter video survaliance system equipment should be integrated into the power supply design. The working current of the infrared illuminator is sensitive with the power supply voltage and different length of cables determined different decay of DC voltage. When you are using a number of infrared light with various distance between the control room, a focus power supply of DC12V may cause a high voltage of the infrared illuminator whichi is near the control room and low voltage which is far away from the control room. In addtion, the deviation of adjusting supply voltage will cause over high voltage and the life time of infrared illuminator  will shorten or burn off; low voltage infrared illuminator will find power shortage. It is proposed that adapt a AC22V supply or a one to one DC voltage power supply. This kind of DC supply has stable output of current in some DC voltage power net or  voltage fluctuations with a voltage stabiization of  AC100V-245V to assure the reliable and stable power of the radiation of  infrared illuminator. In addition, please take into account the following factors, to choice a good distance of radiation of infrared illuminator.

 

1.The low intensity of the cameras.

What is the lowest intensity mean here? The video signal value of camera is 1V, the standard value is 0.7V , and the video signal value of lowest intensity is 1/3-1/2 of the standards for planting. In this case, camera cannot see as in bright day light under a lowest intensity situation.

 

2.The image horizontal of Camera under the lowest intensity situation is examed by the measure cark of video signal, the black and white

alternate with the code for black reflectivity is near 0%, 89.9% more than the rate of white reflection. But in fact we do not have such conditions, such as : the reflection rate and contrast of leaves and grass is low, we cannot have a clear image.

 

3.Low intensity is given by the camera while also providing relative value of F requirements. The zoon lens generally be with a maximum

photography 1:F only, which is the minimum at aperture F (f actual size of the apetrure), F=f/D, if  D for the constant vatio, when f focal length widen 10 times,  F is becoming big (f actual size becomes small). Transmition of light will be greatly affected.

 

4.In the use of automatic aperture lens, AGC or automatic electronic shutter camera, the aperture F of lens will be changed. For example, there are features near  the camera, reflecting llight back to the camera glare, or light exposures the cameras, this camera's sensitivity will be reduced at that time and the automatic aperture size will become small, transmition of light will be greatly affected. Therefore, the application shall be automatically fitted accurately adjust its automatic current balance, DC automatic control mode in the camera's lens aperture scale resistance video automatic control mode, aperture lens adjustment.

 

5.Defensive cover also have an impact on the effectiveness of infrared illuminator. Infrared light  transmit through different media,

transmissivity and reflectivity are also different. Different window glass, especially automatic defrost coated glass, will attenuate the

infrared radiation, so they should choose the Windows layer glass.

 

6.Some manufacturer and distributor giving power only without infrared lights irradiated distance which is a very vague concept. Beside the power consumption that transfer into the infrared light energy, there are losses of heat and power, circuit, light source, infrared light filtering glass efficiency, and so on. The same power infrared illuminator, the radiation distance may be great different.

With the rapid development of infrared night vision systems, the number of infrared illuminator suppliers will increase, but this kind of 

products are not be produced as easy as people imaging. The technology, instrumentation of facilities conditions are vary from them, so I hope the buyer and user can compare these, choose your need and want professinally. To use infrared illuminator firstly is to read the user mannual carefully, especially to ensure the personal safety equipment attention matters. Inspection the point I told previously such as the compatibility and the interfering impact of factors. Users should not arbitrarily increase supply voltage, Infrared illuminator is designed to considered the full play of their irradiance and its security reliability. Increase supply voltage, may burn out the it. Also arbitrarily break up is not allow. If so, the manufacturers may not be responsible for maintenance. If infrared light problems you should contact with the manufacturers or supplier first.

Instruction of IR Illuminator

 

To get excellent performance of the product, please read carefully the following product instruction.

 

Relation between infrared illuminator and camera lens

The reasons for the importance of the camera lens in relation to the infrared illuminator include the following:       

i.   Luminous flux of lens (lumen)

ii.  Angle of the lens and IR illuminator 

iii. Dimension of the chipset

 

Solution

1. Luminous flux of the lens – to choose the lens with the least F- ratio that has the biggest luminous flux. 

2. How to choose the angle of what the appropriate focus is, according to the diagram, to work well with the infrared illuminator – 

a. If working with a fixed lens 

i. Measure the distance between the IR camera and object. 

ii. Select the lens with appropriate focus according to the diagram. 

iii. Double check the angle of the lens. 

b. If working with a zoom lens  

i. Measure the nearest and farthest point of measurand from the camera. 

ii. Selective focus of the lens. 

iii. Double check the angle range of the lens. 

iv. Choose the IR illuminator which can cover the entire range.  

 

3. Computing the formula for focus of the lens, to display the ratio of the measurand, how to select the dimension of a chipset of 1/3”or larger.

a. Focus of lens for 1/3” inch chipset: 

i.   F = 4.8 x L/W 

ii.  F = 3.6 x L/H 

b. Focus of the lens for 1/2” inch chipset: 

i.   F = 6.4 x L/W 

ii.  F = 4.8 x L/H 

 

4. For example: 50 m away from the camera there is a man, 1.7 m tall, which occupies 1/4 height on the screen. F= 3.6 x 15m/1.7m x 1/4 = 8 mm; where F = Focus, L = Distance between lens and measurand; H = height of the measurand; W = weight of measurand. 

 

5. The computing formula is based on the measurand range filling the entire screen.  If it fills only 1/4 of the screen, multiply the focus by 1/4.

 

6. Depending upon a reasonable price and cost, the angle range of one infrared illuminator may not cover the expected range of the zoom camera. The edge of the screen will be gloomy or fuzzy. The solution is to combine IR illuminators with small angles or using different illuminating distances - together with technical expertise.

 

 

Selection of camera 

The camera should have day and night, color and black-and-white functions, or infrared (IR) function, and should be sensitive to 850 nm 

infrared [IR] light. The dimension of the chipset should be up to 1/3 inch and below 0.01 Lux. If using a regular colour camera, the IR filter should be replaced with one that is penetrable to 850 nm IR light. If you only remove the IR filter without replacing it, metachromatism will occur. 

 

Matters that need attention 

  1. Adjustment of the Auto Iris Lens.  The auto iris lens has DC and video drive modes. Adjust the ALC (automatic level control) to fit the IR 

  2. illuminator exactly; otherwise the illuminative distance will be markedly affected. 

  3. The deviation angle of the mounting should be accurate within 2° (in relation to the plane of the camera).

  4. Operating temperature should be between -20° C and 50° C. 

  5. Optimum Distance. Halfway between the illuminate distance and the IR illuminator is the optimum distance. (Test by 1/3 CCD, 0.01 Lux camera). 

  6. Voltage. Use according to the voltage rating of every product. 

  7. Debugging. IR illuminators need to debug before they are used, which, in relation to the camera and other equipment, may need technical assistance from a qualified technician.

 

 

Infrared illuminator angle 

Optimum distance in relation to the focus and angle of the camera lens, based on a person (1.7 m tall) occupying 1/4 height of the screen 

 

 

Selection and use infrared illuminators

 

When choosing an Infrared Illuminator it is important to consider the compatibility of  the camera and the illuminator including the lens, cover, power supply etc.  In the design of an integrated system, the engineer should considered to design the whole system as a low intensity infrared night vision surveillance systems. It would be a gamble at first to focus on the purchase of cameras, lenses, covers, power supply and even install them before considering the need for infrared illuminators,  When considering the use of IR illuminators one should pay attention to the following issues: