Most infrared sensors are designed to operate in the spectral bands corresponding to the “infrared windows” within the ranges of 2 to 5 microns and 8 to 14 microns. Some materials like silicon that are opaque to visible light are relatively a feature of the terrain is due to differences in emissivity or temperature or both. Most materials lie between these two extremes in emissivity. A highly polished surface is an extremely poor absorber its emissive is close to zero. Variations in infrared radiation emitted by various the emissive of blackbody are unity. Transparent to infrared on the other hand bodies of water act as a screen that blocks infrared radiations. A blackbody is an object that completely absorbs all radiation incidents upon it. The primary factors that determine the emission of infrared radiations are:Įmissivity is the ratio of the energy from an object to the energy radiated by a blackbody. It consists of detecting remote objects by recording the amount of infrared energy or heat energy that is emitted by any material having a temperature above absolute zero, that is greater than -273☌. Infrared scanning is otherwise called Thermal Mapping. This is because it presents difficulties in digitizing the film-recorded data and in returning the processed hardcopy to earth. As chlorophyll reflects strongly in the infrared region, living vegetation is strongly reveals in false colour photography.Īlthough photography is an extremely useful and widely employed method for sensing the resources of the earth its usefulness is limited as a space sensor. Therefore, these films are called false colour films.įalse colour films have the ability to penetrate haze, further they are sensitive to charges of reflectance of vegetation. Green appears blue, red becomes green and photographic infrared is recorded as red. In false colour films also there are three layers but in these the infrared emulsion substitutes the blue emulsion owing to this unusual representation of colours result. These three bands together give rise to true picture because these colours are complimentary colours. These three layers are recorded blue, green and red special bands. The colour films are made up of three layers of emulsions. The red and infrared parts of the spectrum can penetrate haze and clear pictures can be made in wet as dry areas. By using minus blue filters, only red and infrared parts of the spectrum can be recorded. Black and white infrared films are particularly sensitive to visible and infrared rays. Remote Battlefield Sensor System - Das Remote Battlefield Sensor System (REMBASS) ist ein Sensorkomplex zur automatischen Ortung von Bewegungen am Boden.V. Unattended Ground Sensors - There are two types of Unattended Ground Sensors that are being fielded under the United States Army s Program, the Urban UGS or U UGS and the Tactical UGS or T UGS.… … Wikipedia Ground clearance sensor - An instrument that senses the distance between the ground and car (for self levelling air suspension) … Dictionary of automotive terms Sie ist ein wesentlicher Bestandteil… … Deutsch Wikipedia etwa: „bodengestützte Abfang“) ist eine Anti Ballistic Missile zur Abwehr von ballistischen Interkontinentalraketen. Ground Based Interceptor - Eine GBI Rakete wird in ein Silo geladen Die Ground Based Interceptor Rakete (dt. Ground-Based Interceptor - Eine GBI Rakete wird in ein Silo geladen Ein startender PLV Booster … Deutsch Wikipedia Material or device which goes through physical change or electronic characteristic change as surrounding conditions … Dictionary of automotive terms Sensor - An electronic detection device that receives and reacts to a signal, such as a change in voltage, temperature or pressure. This non destructive method uses electromagnetic radiation in the microwave band (UHF/VHF frequencies) of the radio spectrum, and detects the reflected signals from… … Wikipedia Ground-penetrating radar - (GPR) is a geophysical method that uses radar pulses to image the subsurface. Commercial aircraft The system… … Wikipedia Another common name for such a system is ground collision warning system (GCWS). Ground proximity warning system - (GPWS) is a system designed to alert pilots if their aircraft is in immediate danger of flying into the ground or an obstacle. Ground truth refers to information that is collected on… … Wikipedia Ground truth - is a term used in cartography, meteorology, analysis of aerial photographs, satellite imagery and a range of other remote sensing techniques in which data are gathered at a distance. The term describes a specific type of sensor network: an amorphous network of spatially… … Wikipedia Sensor Web - The Sensor Web is a type of sensor network or geographic information system (GIS) that is especially well suited for environmental monitoring and control.