Infrared Illuminator Camera
2010
Infrared Illuminator Camera
Night Vision Illuminator JVC Everio?
Looking for a good infrared illuminator that attaches to the camera in night mode. I do a lot of hunting ghosts and my friends and I are interested in making a short documentary. I just got this camera, but I am looking for an illuminator infrared attachment. I saw the Cobra IR Illuminator (which looks awesome), but they say they are backordered … Suggestions? The only thing I found decent addition to the Cobra is at Best Buy: http://www.bestbuy.com/site/olspage.jsp?skuId=8764697&st=infrared&type=product&id=1203815243814
is good
The infrared light and CCTV systems
In recent years we have witnessed the emergence of the night, CCTV cameras per day, all with a "miraculous" ability to amplify several hundred folds of the camera, "Minimum Illumination" by removing the filter IR and color fading circuit. Usually, the day mode sensitivity ranges from 1 lux to 0.25 lux and jumps to 0.01 ~ 0.0001 lux camera Night (B / W) mode. This increase in the "miracle" is not real is something to measure the exposure of the CCD (Charged Coupled Device) infrared emission in high power and misused by specifying a very low lux.
Lux infrared and power are not the same. Lux is a photometric unit which measures point to point lighting (depending on the amount of light that radiates and the distance between the light source and object lit) while the infrared energy is a radiometric unit – measured in watts. The lighting makes it possible for us to see, while Infrared radiation is invisible to the human eye.
The distinction between light and infrared radiation in the frequency or length wave. The wavelength of the visible spectrum ranges from 400nm (violet) to 700nm (red) is divided into an arc rainbow of colors from red to orange to yellow to green to blue and purple.
CIE (International Commission on Illumination), also known as the International Commission Lighting has clearly affirmed the action of light, known as photometry, applies only to the visible light spectrum, and includes units as nit, lumen, lux and candela. Measuring the capacity of the human eye perception have shown that the efficiency is greater than the color green (100% approximately 555 nm) and refuses to about 50% orange (about 610 nm) and blue (around 510 nm) and less than 10%, close to red (650 nm) and violet (about 470 nm). Humans no sense of waves radiated in the ultraviolet (below 400 nm) and infrared (above 700 nm) regions.
CIM standards are very complex, but it will be enough to understand the value of a source of green light (555nm) with 1W power light is 683 lumens, which point to measurement point is equal to 683 Candela. In contrast, 1W red (650 nm), light output is equivalent to only 68 candles and 68 nm and infrared light 1W (over 700) illuminance is equal to 0, 0 and 0 lux candela.
The problem is that few people know that Lux and infrared radiation, or how to measure illumination and radiation. A device for measuring the illumination in lux is the indicator lights, also known as a light meter. The cell includes a filter and calibrated to measure units only light in the visual light spectrum defined by CIE. This filter is similar to the IR cut filter to prevent infrared radiation from order to maintain the accuracy of measurement. Therefore, any known exposure meters, exposure meters, and lighting equipment for the measurement of reading others 0 lux or a residual value when exposed to infrared radiation.
Closed circuit television exposure meters are used to measure the illumination of the scene observed by a security camera, but should never be used to measure infrared radiation, because their reading is at 0 lux, or a residual reading of 0.001 Lux, although the scene may be exposed to far infrared radiation.
To understand the impact of these measures on the system design CCTV, we must first understand how a CCD (Charged Coupled Device) is functioning.
The CCD is designed to resemble the human eye, with an efficiency similar color detection. Therefore, the CCD sensors are more sensitive to green (550 nm) spectral region and decreased sensitivity to 0 ultraviolet (below 400 nm) region. However, the CCD sensor to capture infrared radiation from about 700 nm and up 1000nm (some are more sensitive and can earn up to 1,200 nm).
The sensitivity of the CCD is much weaker in the infrared and performance is reduced to only 5-10% or less, as the graph shows the typical efficiency CCD.
Although the detection efficiency of the IR sensor in the region is very low, the infrared radiation of light that is strongly irradiated by the sun, hot objects, the human body and halogen bulbs or is prevented from reaching the CCD color. If the IR as radiate in the optical path of a color CCD, it will cause serious disruption in the treatment color images. Therefore, each color CCD (or CMOS) sensor must be equipped with an IR cut filter that blocks infrared radiation to reach. As explained above, the sensors are much less sensitive to infrared radiation that the visual spectrum. Therefore, the concept that the removal of the filter increases IR sensitivity of the camera a hundred or a thousand times is a simple case of deformation induced by the inappropriate use of a photometer to measure the infrared radiation.
The common incorrect test for how a camera day and night, night is achieved by introducing a radiator powerful infrared (IR Illuminator misnamed) for infrared radiation in a dark scene. The test is done by connecting a television camera closed circuit (with IR filter removed) to an analyzer waveform measured output signal. The day / night camera is positioned to observe a scene IR irradiated. After the meter is placed in the scene to measure the infrared radiation in Lux.
This is a test that generates false misleading. We have an IR-induced B / W waveform signal analyzer with a value such as 20 IRE, while the meter reads 0 lux, a residual value, such as 0.01 ~ 0.0001 lux, which is used in the art camera table to define the sensitivity or the minimum illumination. You should be aware that the IRE is a unit of signal level or strength and is not associated with infrared radiation anyway.
Correct, but "more difficult "for laboratory analysis of the sensitivity of a surveillance camera or lighting minimum standard is achieved by placing a source of 2000 lux with a test table in front of the camera (connected to an analyzer waveform) with the filter – IR eliminated. After the first insertion opposite the light source until the video signal drops measured at 20 IRE. The minimum illumination is calculated based on the density of the neutral factor reduction filter. Neutral density filters are available in different transmission factors and reduce the intensity light for reasons such as ½, 1 / 16, 1 / 50, 1 / 100, etc. neutral density filters are very similar to those used for lentils Auto Smart iris.
That's why whenever you see a day / night camera with values of minimum illumination of 0.001 lux or 0001 lux, try keep in mind one thing – the strategies often available more weight than common sense.
About the Author
Lucian Maftei
Born in 1978 Lucian Maftei is one of the top romanian CCTV experts. At the age of 29 he has published 3 books
Supraveghere video – 2006
Camere de supraveghere video – 2006
Placa de captura – 2007
Maftei is also the CEO of one of the biggest romanian CCTV equipment importers, installers and distributors.
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