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An infrared detector is a detector that reacts to infrared (IR) radiation. The two main types of detectors are thermal and photonic (photodetectors). The thermal effects of the incident IR radiation can be followed through many temperature dependent phenomena. [2] Bolometers and microbolometers are based on changes in resistance.
A passive infrared sensor (PIR sensor) is an electronic sensor that measures infrared (IR) light radiating from objects in its field of view. They are most often used in PIR-based motion detectors . PIR sensors are commonly used in security alarms and automatic lighting applications.
Dual source and dual receivers are used for self compensation of changes in alignment, light source intensity and component efficiency. The transmitted beams from two infrared sources are superimposed onto an internal beam splitter. 50% of the overlapping sample and reference signal is passed through the gas measuring path and reflected back onto the measuring detector.
Infrared cut-off filters, sometimes called IR filters or heat-absorbing filters, are designed to reflect or block near-infrared wavelengths while passing visible light. They are often used in devices with bright incandescent light bulbs (such as slide and overhead projectors ) to prevent unwanted heating.
In 2004, Jashim Uddin became the president of Bangladesh Plastic Goods Manufacturers and Exporters Association. [8] In June, Bengal Group purchased Rahmania Biscuit and Bread Industries. [9] In March 2007, a fire started at the headquarters of the group in first floor of BSEC Bhaban in Karwan Bazar leaving four dead and 36 injured. [10]
Six television channels, namely STV-US, CSB News, Channel 1, Diganta Television, Islamic TV, and Channel 16, have been taken off air. Bangladesh has four state-owned television stations, of which only three broadcast on terrestrial television, which are BTV Dhaka, BTV Chittagong, and Sangsad Television.
The use of electronics in Bangladesh started in the 1930s through the field of communication with the establishment of radio stations, telephone exchanges, and wireless communication. During World War II , to satisfy military needs, the technology of wireless communication was enhanced and the latest technology was introduced in the British Raj .
The World Bank, in a study conducted in 2008, projected triple digit growth for Bangladesh in IT services and software exports. [10] Bangladesh was also listed as one of the top 30 Countries for Offshore Services in 2010–2011 by Gartner. [11] The Internet penetration has also grown to 21.27 percent in 2012, up from 3.2 percent three years ...