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Device which extracts info from a modulated radio frequency current or voltage
In radio, a detector is a device or circuit that extracts information from a modulated radio frequency current or voltage. The term dates from the first
Detector_(radio)
Early radio receiver component
A crystal detector is an electronic component used in some early 20th century radio receivers. It consists of a piece of crystalline mineral that rectifies
Crystal_detector
Simple radio receiver circuit for AM reception
the received radio wave to produce sound, needing no external power supply. It is named for its most important component, a crystal detector, originally
Crystal_radio
higher radio frequency signal level than the plate detector. Diode detectors also became popular during the later 1920s because, unlike plate detector circuits
Plate_detector_(radio)
World War II makeshift radio
Pacific theaters. The foxhole radio was a crude crystal radio, which used a safety-razor blade as a radio-wave detector with the blade acting as the crystal
Foxhole_radio
precursor radio receivers were primitive devices, more accurately described as radio wave "sensors" or "detectors", as they could only receive radio waves
History_of_radio_receivers
Early radio wave detector
magnetic detector or Marconi magnetic detector, sometimes called the "Maggie", was an early radio wave detector used in some of the first radio receivers
Magnetic_detector
Early radio receiver component
electrolytic detector, or liquid barretter, is a type of detector (demodulator) used in early radio receivers. It was first used by Canadian radio researcher
Electrolytic_detector
Electronic instrument which detects the presence of metal nearby
A metal detector is an instrument that detects the nearby presence of metal. Metal detectors are useful for finding metal objects on the surface, underground
Metal_detector
Topics referred to by the same term
Plate detector may refer to: Plate detector (radio), in electronics, used to demodulate amplitude modulated carrier signal Microchannel plate detector, used
Plate_detector
The Lunar Orbital Radio Detector (LORD) is a cancelled instrument that was intended to conduct astronomical observations as part of the Russian Luna 26
Lunar_Orbital_Radio_Detector
Electronic device
well. The success of radar detectors is based on the fact that radio-wave beams can not be narrow-enough, so the detector usually senses stray and scattered
Radar_detector
Topics referred to by the same term
also refer to: Detector (radio), a device that recovers information from a modulated wave Detector (film), a 2000 Norwegian film USS Detector, two United
Detector_(disambiguation)
ratio detector is a type of detector circuit, commonly used in radio receivers for demodulating frequency modulated (FM) signal. The ratio detector is a
Ratio_detector
Electrical device which utilizes a sensor to detect nearby motion
A motion detector is an electrical device that utilizes a sensor to detect nearby motions (motion detection). Such a device is often integrated as a component
Motion_detector
Early radio wave detector
of radio signal detector used in the first radio receivers during the wireless telegraphy era at the beginning of the 20th century. Its use in radio was
Coherer
Early radio equipment
hot-wire barretter was a demodulating detector, invented in 1902 by Reginald Fessenden, that found limited use in early radio receivers. In effect, it was a
Hot-wire_barretter
Van used to detect the presence of a television set
TV detector vans are claimed to be vehicles used by the General Post Office and later by contractors working for the BBC to enforce the television licensing
TV_detector_van
American radio receiver manufacturer (1921–1956)
V biased the amplifier tubes. The detector used grid-leak bias. Crosley receivers were widely advertised in radio magazines and popular publications
Crosley_Radio_(1921–1956)
Process of extracting the original information-bearing signal from a carrier wave
presence or absence of the radio signal, and produce a click sound. The device that did this was called a detector. The first detectors were coherers, simple
Demodulation
as the detector (demodulator) in the first vacuum tube radio receivers until the 1930s. Early applications of triode tubes (Audions) as detectors usually
Grid-leak_detector
Type of electronic detector or rectifier
practice for using the quasi-peak detector to measure interference to signals other than AM radio. The quasi-peak detector parameters to be used for EMC testing
Quasi-peak_detector
Physics apparatus designed to study neutrinos
neutrino detectors must be very large to detect a significant number of neutrinos. Neutrino detectors are often built underground, to isolate the detector from
Neutrino_detector
Electronic circuit
the original signal. A simple form of envelope detector used in radio detectors is the diode detector. Its output approximates a voltage-shifted version
Envelope_detector
Device that detects smoke, typically as an indicator of fire
A smoke detector is a device that senses smoke, typically as an indicator of fire. Smoke detectors/alarms are usually housed in plastic enclosures, typically
Smoke_detector
Device for receiving radio transmissions
precursor radio receivers were primitive devices, more accurately described as radio wave "sensors" or "detectors", as they could only receive radio waves
Radio_receiver
US Army general and scientist
Bureau, he invented the carborundum radio detector in 1906. It was the first practical mineral radio wave detector and the first commercial semiconductor
Henry_Harrison_Chase_Dunwoody
Rescue technology
Service". … In Europe, the RECCO detector uses the frequency 866.9 MHz … reflectors are the same all over the world. … pulsed radio signal at 20% duty cycle and
RECCO
Instrument to measure minute voltage
A null detectors is an electrical measurement instrument used to measure minute voltages. High precision null detectors can resolve voltage differences
Null_detector
Signal processing technique
hear a sound. The direct-conversion (heterodyne) detector was invented to make continuous wave radio-frequency signals audible. The heterodyne or beat
Heterodyne
Detector for separated compounds from a chromatographic column
chromatography detector is a device that detects and quantifies separated compounds as they elute from the chromatographic column. These detectors are integral
Chromatography_detector
lectures Lodge demonstrated a detector that would become standard in radio work, an improved version of Branly's detector which Lodge dubbed the coherer
Invention_of_radio
1949 portable radio
lower frequency employed in a true superregenerative detector. The regenerative detector in the radio hat had adequate sensitivity to receive stations much
Radio_hat
NASA satellite of the Explorer program
Precipitating Electron Detector Radio Doppler System Radio Range/Rate System SECOR Range Transponder Non-geodetic systems included a laser detector and a Minitrack
Explorer_36
Instrument that can measure properties of X-rays
X-ray detectors are devices used to measure the flux, spatial distribution, spectrum, and/or other properties of X-rays. Detectors can be divided into
X-ray_detector
Audio device to detect the presence of bat sound signals
Common Pipistrelle Common Pipistrelle call heard on a heterodyne bat detector - 68 KB. This is a typical echolocation call with "feeding buzzes" when it
Bat_detector
Radio communication system implemented in software
hardware (e.g. mixers, filters, amplifiers, modulators, demodulators, detectors, etc.) are instead implemented by means of software on a computer or embedded
Software-defined_radio
Electronic device
a square law detector is a device that produces an output proportional to the square of some input. For example, in demodulating radio signals, a semiconductor
Square-law_detector
Device used to detect defects on trains
When rolling stock passes by a detector, an automated readout notifies the crew of any defects via radio. Defect detectors were one of the inventions which
Defect_detector
Specialty of electronic engineering
mixers, detectors, combiners, filters, impedance transforming networks and other devices. Verification and measurement of performance of radio frequency
Radio-frequency_engineering
Japanese educational electronics kits
Diode Detector Radio EX-30 EX-15 + EX-A morse key block, short cables Morse Code Practice Circuit EX-60 EX-30 + EX-B IC Amplifier I-Diode Detector + IC
Gakken_EX-System
Electronic method of transmitting information with a carrier wave
one of the first detectors able to rectify and receive AM, the electrolytic detector or "liquid baretter", in 1902. Other radio detectors invented for wireless
Amplitude_modulation
Radio receiver with amplifier stages and a detector
the detector, while rejecting all other signals picked up by the antenna. a detector, which extracts the audio (modulation) signal from the radio carrier
Tuned radio frequency receiver
Tuned_radio_frequency_receiver
American electrical engineer and inventor (1877–1956
crystal detector was the central component in many early radio receivers from around 1906 until about 1920. Pickard also experimented with antennas, radio wave
Greenleaf_Whittier_Pickard
Physicist, biologist and botanist (1857–1937)
such as Russian physicist Alexander Stepanovich Popov's radio wave based lightning detector, also inspired by Lodge's experiment. Although Bose's work
Jagadish_Chandra_Bose
Electronic control system
feedback input to the phase detector to produce a frequency synthesizer. A programmable divider is particularly useful in radio transmitter applications
Phase-locked_loop
Two-terminal electronic component
time, in the early 1900s, as radio receiver detectors. Until the 1950s, vacuum diodes were used more frequently in radios because the early point-contact
Diode
Electronic circuit using positive feedback
feedback around an RF detector stage and operating the circuit below the onset of oscillation. Armstrong's key insight was that radio-frequency energy existed
Regenerative_circuit
Neutrino telescope at the South Pole (1996–2009)
The Antarctic Muon And Neutrino Detector Array (AMANDA) was a neutrino telescope that was located beneath the Amundsen–Scott South Pole Station. In 2005
Antarctic Muon And Neutrino Detector Array
Antarctic_Muon_And_Neutrino_Detector_Array
Remote observation of lightning strikes
Alexander Stepanovich Popov. It was also the first radio receiver in the world. Ground-based and mobile detectors calculate the direction and severity of lightning
Lightning_detector
Russian physicist (1859–1906)
detector he had built that worked via using a coherer to detect radio noise from lightning strikes. This day is celebrated today in Russia as Radio Day
Aleksandr_Popov_(physicist)
Instrument for measuring ionizing radiation
in neutron detectors. The quantum efficiency of a gamma-ray detector (per unit volume) depends upon the density of electrons in the detector, and certain
Scintillation_counter
Device for measuring a physical quantity
calorimetry. Also by analyzing phase-diagrams. Infrared spectroscopy Neutron detector Radio frequency spectrometers for nuclear magnetic resonance and electron
List_of_measuring_instruments
National holiday in Russia on 7 May
development of radio in Russia. It takes place on 7 May, the day in 1895 on which Alexander Stepanovich Popov demonstrated a radio based lightning detector. On 7
Radio_Day
Electronic device
devices have a wide range of applications, including high-sensitivity detectors of electromagnetic radiation, magnetometers, high speed digital circuit
Superconducting tunnel junction
Superconducting_tunnel_junction
and stability. The receiver must contain a detector to recover the information initially impressed on the radio carrier signal, a process called modulation
Radio_receiver_design
Japanese company in the wireless communication industry
radar detectors are now manufactured in South Korea.[citation needed] As of 2018, core products included cordless telephones, radar detectors, radio scanners
Uniden
Use of radio waves for communication
the development of continuous wave radio transmitters, rectifying electrolytic, and crystal radio receiver detectors enabled amplitude modulation (AM)
Radio
Crystal radio receiver
and General Radio. Its primary (antenna) and secondary circuits were both tunable by variable capacitance and inductance. A crystal detector (Type DC-1)
SCR-54
Ukrainian national radio station
Radio Promin (Ukrainian: Радіо Промінь, romanized: Radio Promin', lit. 'Radio Lightbeam'), also known as UR-2, is the second radio channel of Suspilne
Radio_Promin
lightning detector that used a coherer-based radio receiver. He presented it to the Russian Physical and Chemical Society on May 7, 1895, known as Radio Day
History_of_radio
Canadian engineer (1910–1962)
station at Shirleys Bay near Ottawa that used a magnetometer, gamma-ray detector, radio receiver, gravity meter and recording equipment to detect anomalous
Wilbert_Brockhouse_Smith
Form of radiography
display quality of the image. Flat panel detectors (FPDs) are the most common kind of direct digital detectors. They are classified in two main categories:
Digital_radiography
National radio station in Ukraine
stv.detector.media. Archived from the original on 15 August 2018. Retrieved 15 August 2018. "Третій канал "Культура" | Українське радіо". ukr.radio. Archived
Radio_Culture
USSR-era Russian space satellite
away from the planet. Source: Radiation Detector Charged Particle Detector Magnetometer Piezoelectric Detector Radio Telescope Nuclear Component of Cosmic-ray
Zond_2
American electronics store chain
Enercell (cells and batteries), Road Patrol (radar detectors, bicycle radios), Patrolman (Realistic radio scanner), Deskmate (software), KitchenMate, Stereo
RadioShack
Quantitative study of the energy spectra of gamma-ray sources
segmented detectors with add-back (see: clover (detector)). The voltage pulses produced for every gamma ray that interacts within the detector volume are
Gamma_spectroscopy
response Demodulation Describing function Design Desktop computer Detector (radio) DIAC Dielectric Differential (mathematics) Digital audio broadcasting
Index of electrical engineering articles
Index_of_electrical_engineering_articles
Area in which radio transmissions are heavily restricted
The National Radio Quiet Zone (NRQZ) is a large area of land in the United States designated as a radio quiet zone, in which radio transmissions are restricted
United States National Radio Quiet Zone
United_States_National_Radio_Quiet_Zone
American radio with 5 vacuum tubes
separate oscillator tube. The detector and first audio stage were provided by a dual diode/triode combination tube. When the detector/first audio tube contained
All_American_Five
Italian electrical engineer and inventor (1874–1937)
experiments and, at the suggestion of Righi, began using a coherer, an early detector based on the 1890 findings of French physicist Édouard Branly and used
Guglielmo_Marconi
Means to measure signal processing ability
classification Constant false alarm rate Decision theory Demodulation Detector (radio) Estimation theory Just-noticeable difference Likelihood-ratio test
Detection_theory
American inventor (1873–1961)
noninfringing device for receiving radio signals. In 1903, Reginald Fessenden demonstrated an electrolytic detector, and de Forest developed a variation
Lee_de_Forest
Radio telescope observatory in New South Wales, Australia
metres (89 ft) above the dish. The cabin contains multiple radio and microwave detectors, which can be switched into the focus beam for different science
Parkes_Observatory
Type of amplifier that emphasizes a specific frequency in a noisy signal
frequency, can still be reliably detected. It is essentially a homodyne detector followed by low-pass filter that is often adjustable in cut-off frequency
Lock-in_amplifier
Class of solid-state x-ray digital radiography devices
Flat-panel detectors are a class of solid-state x-ray digital radiography devices similar in principle to the image sensors used in digital photography
Flat-panel_detector
Device that controls current between electrodes
earlier technologies such as the spark gap transmitter and crystal detector for radio or mechanical and electromechanical computers, the invention of the
Vacuum_tube
Overview of and topical guide to space science
observational astronomy are generally made by the specifications of the detectors: Radio astronomy – >300 μm Submillimetre astronomy – 200 μm to 1 mm Infrared
Outline_of_space_science
Demodulator that uses a replica of the unmodulated carrier
the phase information that conveys hue. Synchronous detectors are also found in some shortwave radio receivers used for audio signals, where they provide
Synchronous_detector
Fast, high sensitivity, low noise electronic photon detector
Photomultiplier tubes (photomultipliers or PMTs for short) are extremely sensitive detectors of light in the ultraviolet, visible, and near-infrared ranges of the
Photomultiplier_tube
Final Soviet sample-return mission to the Moon, 1976
photographic imaging system Improved drill/Remote arm for sample collection Radiation detector Radio-altimeter Luna programme ← Luna 1975A Luna 25 (Russian) →
Luna_24
Electronic circuit to automatically adjust signal strength
the detector stage and applied to control the gain of the IF or RF amplifier stages. The signal to be gain controlled (the detector output in a radio) goes
Automatic_gain_control
1980 compilation album by Various artists
Bullshit Detector was the name of a series of compilation LPs put together by the anarcho-punk band (and art collective) Crass and released on their Crass
Bullshit_Detector
Building system designed to warn of a fire
required in most commercial buildings. They may include smoke detectors, heat detectors, and manual fire alarm activation devices (pull stations). All
Fire_alarm_system
Electronic detecting or amplifying vacuum tube
characteristics and erratic performance. Originally developed as a radio receiver detector by adding a grid electrode to the Fleming valve, it found little
Audion
Audio bug to spy on US embassy in Moscow
reproduce the results using an untuned wideband receiver with a simple diode detector/demodulator, similar to some field strength meters. Two additional State
The_Thing_(listening_device)
"Hertzian wave" (radio wave) based lightning detector using a coherer. November 1895: Jagdish Chandra Bose sets up a demonstration of radio microwave at the
Timeline_of_radio
Type of radio design
much more demanding task compared to the more robust envelope detector or ratio detector at the output of an IF stage in a superheterodyne design. However
Direct-conversion_receiver
Measurement of electromagnetic radiation for astronomy
or rocket mounted detectors. Radio signals have much longer wavelengths than optical signals, and require the use of antennas or radio dishes. Infrared
Astronomical_spectroscopy
Observatory in Greenland
multi-messenger astronomy. Located at 3,216 metres (10,551 ft) above sea level, the detector array is planned to consist of 35 stations. By 2022 seven stations have
Radio Neutrino Observatory Greenland
Radio_Neutrino_Observatory_Greenland
Ethnic enclaves in Cyprus (1963–1974)
Galvanometers Iron pickets Iron poles and rods Khaki-colored cloth Mine detectors Radio sets Safety fuses Sand Studs for boots Sulfur Telephones Tents and
Turkish_Cypriot_enclaves
French physicist (1868–1917)
Academy. Crystal radio 500 kHz Coherer Édouard Branly Cat's whisker detector Electrolytic detector Foster–Seeley discriminator Grid-leak detector Hot wire barretter
Camille_Tissot
French radio pioneer and army general
telegraphy).[citation needed] In 1903 Ferrié invented a novel electrolytic detector, invented independently by Dr. Michael I. Pupin (1899), Professor Reginald
Gustave-Auguste_Ferrié
Unit of spectral flux density
evenly distributed across the detector bandwidth, the detected signal will increase in proportion to the bandwidth of the detector (as opposed to signals with
Jansky
Mineral
semiconductor crystal detectors in the early development of crystal radios before the advent of vacuum tubes. As an early radio detector it was used in conjunction
Zincite
Radiation detector holder
medical facility, such as a hospital or clinic, a gantry holds radiation detectors, a radiation source, or both, used to diagnose or treat a patient's illness
Gantry_(medical)
Being seen by someone or something
history of radio communications, the term "detector" was first used for a device that detected the simple presence or absence of a radio signal, since
Detection
Border separating East and West Germany, 1949–1990
would have replaced the fences with infrared barriers, radio beacons, vibration detectors, radio-frequency reconnaissance equipment and electrical surge
Inner_German_border
Electronic component
generated a radio signal at a frequency fo offset from the incoming radio wave carrier fC. This was applied to the rectifying detector with the radio carrier
Tikker
Radio broadcasting using amplitude modulation
1904–1906, the crystal detector, the simplest and cheapest AM detector, was developed by G. W. Pickard. Homemade crystal radios spread rapidly during the
AM_broadcasting
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