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Imaging Infrared Seekers
A more common approach is to use an infrared waveband where there is a large amount of ambient light from the thermal emission of the background. There are three main infrared bands: - Near Infrared: 0.7 µm to about 2 µm. • Little thermal emission in this band, but can be used with laser illumination systems. - Mid-wave Infrared: 3 µm to 5 µm. • The mid-wave band is good for hot objects because thermal emission peaks in this waveband for aircraft and missile plumes. - Long wave Infrared: 8 µm to 14 µm. • The long wave band is good for room temperature scenes since the thermal emission peaks in this band for 300K. Infrared imagers are used in each of these bands, but there are a number of problems associated with their use and manufacture. - Silicon photodetectors do not work (CdHgTe). - The focal planes often require cooling to 77K. - Few are sold, and therefore need to be made to order, and are far more expensive that visible systems.
briefly explain the switching characteristics of SCR
young''s modulus by uniform bending
AAA has 1,000,000 shares of common stock trading at $20.00 per share. The company''s debt consists of 2,000 $1,000 par value 10-year 7.0% annual coupon bonds with semiannual paymen
advantages and disadvantages oh hot and cold die working in the subject of basic mechanical engineering
dc load line for a diode & same for circuit consisting of supply voltage in series with resistance & diodes
Assume you invest $150 per month in a stock. Stock prices are as follows: January $10.50, February $9.75, March $9.50, April $11.00, May $10.75, June $9.75, July $9.00, August $8.5
To achieve successful results in powder metallurgy the metallic powder must be thoroughly homogenized. The term blending and mixing are both used in this content. Blending refers t
DEALER'S CERTIFICATE Reference: When the sale of an aircraft involves flight without a Certificate of Registration, The C.A.A. will permit the aircraft to fly under certain re
The resistance of the strain gauges is usually measured with a Wheatstone bridge. All bridges have balancing circuits which can be apex or parallel. Both methods are equivalent.
Depreciation Methods Technically speaking, U.S. tax law permits deduction from taxable income of a reasonable allowance for wear or tear, natural decay or decline, exhaustion,
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