Detection


Detection

In general, detection is the extraction of information from any clear or clouded ambient or otherwise accessible stream of information without neither support from the sender nor synchronization to the sender.

In the history of radio communications, "detectors" where the first operable type of semiconductor diodes to extract modulated signal from their carrier. Still today, in multi-channel systems, detecting is the selective extraction of an AM signal from its carrier frequency.

In communications, detection is the extraction of intelligence from a carrier signal in a stream of electro-magnetic energy. Note that this may be either an "overt" signal, as in a conventional radio broadcast, a "noise" signal as in heavily interfered ambient signals or a "covert" signal, as in steganography.

In opto-electronic or other radiation systems, the detection means the generation of an electrical signal in response to a received optical input. For example, the optical signal received from an optical fiber is converted to an electrical signal in a detector, often by a photodiode.

In steganography, attempts to detect encoded intelligence from suspected carrier material is referred to as steganalysis. Steganalysis has an interesting difference from most other types of detection, in that it can often only produce the probability of the existence of payload material encoded in the carrier; this is in contrast to the detection of signals which are simply encrypted, as the ciphertext can often be detected with certainty, even if it cannot be decoded.

In the military, detection means the special discipline of reconnaissance with the aim to recognize the presence of an object in a location or ambience.

Finally, the art of detection, also known as "following clues", is the work of any detective [http://ca.geocities.com/t369@rogers.com/index.html] .

ee also

* Signal detection theory


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  • détection — [ detɛksjɔ̃ ] n. f. • 1929; de l angl. to detect → détecter 1 ♦ Action de détecter. Détection des gaz toxiques. Détection des mines de guerre, des nappes de pétrole. Détection sous marine. Détection électromagnétique par radar. Appareil de… …   Encyclopédie Universelle

  • Detection — De*tec tion, n. [L. detectio an uncovering, revealing.] The act of detecting; the laying open what was concealed or hidden; discovery; as, the detection of a thief; the detection of fraud, forgery, or a plot. [1913 Webster] Such secrets of guilt… …   The Collaborative International Dictionary of English

  • detection — I noun apprehension, ascertainment, disclosure, discovery, exposure, finding, learning, perception, sighting, spotting, unearthing, unfolding II index discovery, observation, perception, recognition …   Law dictionary

  • detection — early 15c., exposure, accusation, from L. detectionem (nom. detectio) an uncovering, from pp. stem of detegere (see DETECT (Cf. detect)) …   Etymology dictionary

  • detection — [n] discovery apprehension, disclosure, espial, exposé, exposure, ferreting out, find, revelation, strike, tracking down, uncovering, unearthing, unmasking; concepts 38,183 Ant. failure, miss, mistake …   New thesaurus

  • detection — [dē tek′shən, ditek′shən] n. [ME < LL detectio: see DETECT] 1. a finding out or being found out: said esp. of what tends to elude notice 2. DEMODULATION …   English World dictionary

  • detection — noun ADJECTIVE ▪ early ▪ Our aim is the early detection and treatment of all cancers. ▪ crime (esp. BrE), fraud ▪ error ▪ radiation …   Collocations dictionary

  • detection — [[t]dɪte̱kʃ(ə)n[/t]] 1) N UNCOUNT: oft N of n Detection is the act of noticing or sensing something. ...the early detection of breast cancer. 2) N UNCOUNT: oft N of n Detection is the discovery of something which is supposed to be hidden. They… …   English dictionary

  • detection — de|tec|tion [dıˈtekʃən] n [U] when something is found that is not easy to see, hear etc, or the process of looking for it detection of ▪ Early detection of the disease is vital. escape/avoid detection ▪ By flying low, the plane avoided detection… …   Dictionary of contemporary English

  • detection — noun 1) the detection of methane Syn: discernment, perception, awareness, recognition, identification, diagnosis; sensing, sight, smelling, tasting 2) the detection of insider trading Syn: discovery …   Thesaurus of popular words