What is an infrared filter?
Infrared filter is usually a light filter designed to block all visible light and leave the infrared light passage, which is a wavelength of approximately 800 nanometers, while visible light ranges from 400 to 700 nanometers in wavelength. Normal use for such filtering is in infrared camera filters that photograph, reminiscent of black and white traditional photographs. The difference with infrared photographs and standard black and white photographs is that infrared images show biological objects such as vegetation and animals because they emit infrared light that is of heat, and features such as soil or sky look darker. Some types of infrared filter serve the reverse function and block only infrared light, such as those used in welding glasses that block thermal energy that can be clearly seen through glasses.
Using infrared photographic filters was a cumbersome task because the photographer basically photographed blind, which he or she could not immediately see the results. This has led to many expensive experimenting with the film and setting up to get good photos, where the quality of the picture remained unknown until the film developed. With the advent of digital cameras that can store thousands of images and do not require the process of film development, infrared filter photography has become much more popular. The darkest features in the outdoor environment photographed using an infrared filter are the ocean, dry soil and artificial stone and concrete structures. The heads that emit the most heat from the ground back to space at night, and are therefore the brightest in the infrared spectrum, are vegetation, wild animals and sandy soil or beaches, giving an infrared photography essential appearance similar to a spirit that has a broad visual attraction.
Development of infraredNo technology has led to many other uses in addition to TomFotography. It is widely used in sensors to monitor environmental and pollution control, in climatology for analysis of the Earth's ozone layer and in military applications and aircraft controls. Infrared emissions are also important in medical science, where blood is analyzed or where spectroscopic equipment is used to look at other biological activity.
Since the use for infrared filter is enhanced, it is made to pass or block the very specific range of infrared light spectrum. As a result, technology is useful in sensors that evaluate an infrared light beam for various communication purposes, such as safety systems, scanning systems for consumable products or wireless controls. Therefore, the infrared filter is classified by what the range of light it interacts with is. Classification terms include a narrow zone passage (NBP), a wide bandwidth (WBP) and anti -reflective (AR). The tolerance level for the wavelength of the light that may pass through the filter is not afraid of blocked is usually ± 10 nanometers.