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Topic: Heterodyne

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Superheterodyne receiver

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	Definition: heterodyne
		To generate new frequencies by mixing two or more signals in a nonlinear device such as a vacuum tube, transistor, or diode mixer.
		Note: A superheterodyne receiver converts any selected incoming frequency by heterodyne action to a common intermediate frequency where amplification and selectivity (filtering) are provided.
		A frequency produced by mixing two or more signals in a nonlinear device.
	www.atis.org /tg2k/_heterodyne.html (97 words)

	Radio Broadcast Signals
		Heterodyning is a method for transferring a broadcast signal from its carrier to a fixed local intermediate frequency in the receiver so that most of the receiver does not have to be retuned when you change channels.
		This process produces a beat frequency equal to the difference between the frequencies, and this difference frequency constitutes a third carrier which will be modulated by the original signal.
		Heterodyning is extremely important in radio transmission -- in fact, the development of heterodyning schemes was one of the major developments which led to mass communication by radio.
	hyperphysics.phy-astr.gsu.edu /hbase/audio/radio.html (438 words)

	Heterodyne laser instantaneous frequency measurement system - Patent 4798467
		The laser heterodyne instantaneous frequency diagnostic system 10 can measure the absolute frequency of pulsed lasers as well as frequency variation of the laser during the pulse (as short as 10-100 nanoseconds pulse length).
		The heterodyne beat signal from detector 52 and the intensity amplitude waveform of the pulsed laser from detector 50 are both digitally recorded for the individual laser pulse under test, using a digitizer 70 (desirably a very fast Tektronix 7912AD Transient Digitizer).
		To extend the maximum allowable frequency difference between a processed pulsed laser and a CW laser, an external mixer may be used with a microwave local oscillator to down-convert the laser beat signal frequency to lie within the bandwidth of the transient digitizer, as shown in FIG.
	www.freepatentsonline.com /4798467.html (2846 words)

	Optical heterodyne detector (Site not responding. Last check: )
		Heterodyne detection is achieved by matching the wave front of a local oscillator beam with the wave front of a received optical signal.
		The heterodyne signal of beam 40 is detected by a photodetector 46.
		Furthermore, the time-reversed characteristics of the phase conjugate beams cause heterodyne detector 50 to be relatively insensitive to the distance MPPC 52 and mirror 54 are positioned from beam splitter 56.
	www.stickebana.com /scitech/corrosion_resistant_magnetic_recording_read/optical_heterodyne_detector.html (2084 words)

	U.S. Patent: 5170219 - Optical heterodyne interference detecting apparatus for measuring displacement characteristic of ...
		An optical heterodyne interference type detecting apparatus according to claim 1, wherein said physical quantity is a frequency of a voltage applied to said workpiece.
		An optical heterodyne interference type detecting apparatus according to claim 10, wherein said displacement of at least said portion of the workpiece occurs in a direction parallel to an optical path of said displacement detecting means along which said measuring light beam travels.
		An optical heterodyne interference type detecting apparatus according to claim 11, further comprising a table on which said piezoelectric element is placed, said displacement detecting means irradiates a top surface of said piezoelectric element with said reference light beam, and receives as said measuring light beam said reference light beam reflected by said top surface.
	www.everypatent.com /comp/pat5170219.html (3264 words)

	SoundClick artist: Heterodyne - Band page with free MP3 music downloads on SoundClick
		Heterodyne is a two man band for now.
		Heterodyne was up in the air for a while.
		Juan, guitaris of Heterodyne was walking across a yard one evening when he came across the sound of drums coming from the house next door.
	www.soundclick.com /heterodyne&ref=10 (247 words)

	Who Invented the Superheterodyne?
		Heterodyne detection provided an apparent amplification of the received signal, an important effect since at first no other method of radio-frequency amplification was known (the Audion was used only as a detector for several years after its 1906 invention, not as an audio- or radio-freqency amplifier).
		Heterodyne amplifications of 100 or more were measurable, which in turn could be increased fifty times in a regenerative circuit connection.
		This heterodyning, it turned out, did not alter the modulation content of the original spark signals, but preserved all the original sidebands and therefore the characteristic tone that allowed each spark transmitter to be distinguished aurally from others.
	antiqueradios.com /superhet (7468 words)

	Estimating Heterodyne-Interferometer Polarization Leakage
		In a typical application in which a heterodyne interferometer is used as a displacement or length gauge, the effect of the polarization leakage is a nonlinearity that typically gives rise to an error of the order of 1 nm in the displacement or length.
		In practice, the phase measurement is degraded by noise and by systematic effects caused by imperfections in the interferometer optics.
		A Typical Heterodyne Optical Interferometer is subject to polarization leakage, which introduces a phase error and a corresponding nonlinearity into its response.
	www.nasatech.com /Briefs/Apr02/NPO20906.html (687 words)

	IMT - Applied Optics - Heterodyne scanning near-field optical microscopy for amplitude and phase measurements
		Heterodyne scanning near-field optical microscopy for amplitude and phase measurements
		Therefore, experimental studies require coherent detection methods, in particular heterodyne scanning probe microscope (heterodyne SNOM), which allow the measurement of amplitude and phase of the optical field with sub-wavelength resolution.
		We show how a heterodyne interferometer has been combined with a scanning probe optical microscope in order to measure amplitude and phase of optical near- and far-fields.
	www-optics.unine.ch /former/microoptics/subwavelength_measurements/subwavelength_measurements.html (1530 words)

	Common-Path Heterodyne Interferometers
		A COPHI could be used, for example, to measure the deviation of the surface of a mirror or other optical component from nominal flatness or nominal sphericity.
		frequency heterodyne output of photodiode 2 would thus correspond to the surface height at the measurement spot.
		By a combination of electronic and optoelectronic switching, the outputs of the photodiodes would be fed sequentially to the phase meter to generate a sequence of phase readings, each corresponding to one pixel.
	www.nasatech.com /Briefs/July01/NPO20786.html (639 words)

	THz Receivers
		The example chosen shows some of the strengths of the heterodyne method and demonstrates how a real system can be calibrated and operated.
		The main reason for selecting this example was because it shows the power of heterodyne methods to provide a level of frequency resolution and power (or source temperature) sensitivity which would otherwise be virtually unobtainable.
		The spectrum shows that this particular cloud is moving towards the observer and seems to consist of three distinct ‘lumps’ producing frequencies which have been Doppler shifted upwards by 900, 2000, and 3000 kHz.
	www.st-andrews.ac.uk /~www_pa/Scots_Guide/RadCom/part3/page1.html (731 words)

	Heterodyne - Wikipedia, the free encyclopedia
		In telecommunications and radio astronomy, to heterodyne is to generate new frequencies by mixing two or more signals in a nonlinear device such as a vacuum tube, transistor, diode mixer, Josephson junction, or bolometer.
		The mixing of each two frequencies results in the creation of two new frequencies, one at the sum of the two frequencies mixed, and the other at their difference.
		The word heterodyne is derived from the Greek roots hetero-, 'different', and -dyne, 'power'.
	en.wikipedia.org /wiki/Heterodyne (706 words)

	Planetary Systems - IR Heterodyne Spectrometer (Site not responding. Last check: )
		The Goddard Infrared Heterodyne Spectrometer (IRHS) is currently located at the Coudé focus of NASA's 3 meter Infrared Telescope Facility on the summit of Mauna Kea, Hawaii (elev.=13,800 feet).
		The IRHS is a very high resolution spectrometer which is use to study the infrared energy of planets and comets.
		In March 1995, the Heterodyne Team made observations of Mars and Jupiter with NASA's 3-meter IRTF atop Mauna Kea (elev.
	ssed.gsfc.nasa.gov /code693/irhs/irhs.html (825 words)

	Spectroscopy : Spectroscopy, heterodyne
		Fiber-laser-based noise-immune cavity-enhanced optical heterodyne molecular spectrometry for Doppler-broadened detection of C
		Terahertz quantum cascade laser as local oscillator in a heterodyne receiver
		Evaluation of quantum-cascade lasers as local oscillators for infrared heterodyne spectroscopy
	www.opticsinfobase.org /ocisdirectory/300_6310.cfm (316 words)

	Max Planck Institute for Gravitational Physics, Potsdam - Heterodyne Interferometer with Phasemeter for LISA
		The LISA Technology Package (LTP) is a technology demonstration mission in preparation for the LISA space-borne gravitational wave detector.
		A central part of the LTP is the optical metrology package (heterodyne interferometer with phasemeter) which monitors the distance between two test masses with a noise level of 10 pm/√Hz.
		Detailed laboratory investigations have demonstrated the feasibility of the interferometer concept, the alignment measurement techniques, and the phasemeter operation.
	www.aei.mpg.de /english/research/highlights/02_laser/index.html (115 words)

	Heterodyne laser instantaneous frequency measurement system (US4798467)
		A heterodyne laser instantaneous frequency measurement system is disclosed.
		The system utilizes heterodyning of a pulsed laser beam with a continuous wave laser beam to form a beat signal.
		The beat signal is processed by a controller or computer which determines both the average frequency of the laser pulse and any changes or chirp of th frequency during the pulse.
	www.delphion.com /details?pn10=US04798467 (337 words)

	heterodyne (Site not responding. Last check: )
		The instrument is based on the 12.5 T superconducting magnet and is configured as a quasi-optical device employing heterodyne detection that results in better sensitivity.
		In a heterodyne the EPR signal is not directly observed at the frequency of the incident microwaves, but rather it is mixed with a second microwave frequency to generate a difference frequency of several GHz.
		The heterodyne spectrometer uses a 12.5 Tesla superconducting magnet (lower left corner).
	fajerpc.magnet.fsu.edu /epr/heterodyne.html (206 words)

	Girl Genius Online Comics!
		Agatha is only now coming to realize her full potential as a Spark, and is finding that both her talent and her family make her a target in the eyes of the powerful.
		Revels in frequent roles as "Klaus, the Heterodyne Boys' Cowardly Sidekick." Is convinced that there is no problem that cannot be solved by some form of pie.
		She was received in most of the courts of Europe, was highly regarded by the general population, and set off a long-running fad for things American.
	www.girlgeniusonline.com /ggmain/cast.php (1596 words)

	Heterodyne (Site not responding. Last check: )
		The futuristic version of Usurper Dyne is Heterodyne, which means "to combine two different waves in order to create a new wave that is the sum or difference of the two." It's a scientist's overly-technical allusion to his cyborg nature and his ambivalence towards it.
		Though Heterodyne is no longer precisely a cyborg, he is not precisely a robot, either.
		In the chaos surrounding the Glazer insurgency in the late twenty-first century, Usurper Dyne's cybernetic systems were heavily damaged, and his organic brain was left largely unprotected against the crystallizing energies that the foe utilized.
	www.niflheim.net /games/cohlex/heterodyne.html (307 words)

	Basic Optical Heterodyne Receiver (Schematic) (Site not responding. Last check: )
		This diagram shows the basic design of an optical heterodyne receiver for detecting cw beacons.
		The 1st local oscillator (laser) power is divided in half and used to feed two separate optical heterodyne receivers.
		One optical heterodyne receiver responds to any vertically polarized signal component while the other responds to any horizontally polarized signal component.
	www.coseti.org /9006-026.htm (75 words)

	Dynamic Light Scattering
		It is this difference in the frequency of the scattered light among particles of different sizes that is used to determine the sizes of the particles present.
		In both cases the interference signal frequencies are indicative of the Doppler frequency shifts due to the particles' Brownian motion and are the basis of the particle sizing measurement by DLS.
		The heterodyne Controlled Reference Method of the Nanotrac technology overall permits a dynamic measuring range that is both higher and lower than the homodyne concepts.
	www.microtrac.com /dynamicscattering.cfm (1506 words)

	Amazon.com: Girl Genius Volume 4: Agatha Heterodyne & The Circus Of Dreams (Girl Genius (Paperback)): Books: Phil ... (Site not responding. Last check: )
		Agatha is the daughter of one of the long-lost Heterodyne boys, raised in ignorance of her heritage by two people constructed by her uncle and dedicated to keeping the Spark in her supressed.
		The earlier Heterodynes were horrors, feared by all until her father and uncle redeemed the name before their mysterious disappearance.
		Though she doesn't know that she has the Spark until the device that suppressed her talents was stolen from her, she's a potential danger to the peace, the world, and herself.
	www.amazon.com /Girl-Genius-Agatha-Heterodyne-Paperback/dp/1890856363 (1578 words)

	Bat Detecting
		The bat calls are picked up by an ultrasonic microphone and mixed with the output of a high frequency oscillator in such a way that the result is the sum and difference of the two frequencies.
		If you are considering the purchased of a bat detector it may be wise to attend a few bat watching events with more experienced people and see what they are using and try them out.
		The sounds from the bat detector are usually alternate "smacks" and "tocks" at a fairly slow repetition rate which together sounds like a fairly irregular "chip-chop".
	www.londonbats.org.uk /batdets.htm (894 words)

	freesound :: view sample :: Heterodyne radio effect.mp3 (Site not responding. Last check: )
		An effect mimicking the heterodyne whine of an old time radio tuner.
		Heterodyne radio effect.wav :: (0:33) :: A wav version of the other file by the same...
		Heterodyne radio effect 2.wav :: (0:13) :: An effect mimicking the heterodyne whine of an...
	freesound.iua.upf.edu /samplesViewSingle.php?id=19891 (352 words)

	The single pixel heterodyne receivers (Site not responding. Last check: )
		Table: Heterodyne receivers available for the summer 2003 observing semester.
		Performance figures are based on recent measurements at the telescope.
		Table: Heterodyne receivers available for the next winter observing season.
	www.iram.es /GENERAL/calls/node13.html (257 words)

	Jack Doud's Heterodyne Power Unit
		A few of the members were talking about how they'd make a replica of Gil's Heterodyne artifact.
		The Heterodyne trilobite symbol was made by bending a peice of plastic to the curvature of the sphere and sculpting the shape using Milliput.
		I glued a strip of plastic to one of the domes of the sphere, leaving the other side removable for when I'd need to change the battery.
	www.angelfire.com /pa5/jdoud/HPU.html (545 words)

	The Evolution of the Heterodyne Boys
		In the DC Universe, the Heterodyne Boys are still are named Bill and Barry and appear the same as they did in Grimjack.
		The only two titles given in the series are The Heterodyne Boys and Their Anthiracite Burning Earth Orbiter and The Heterodyne Boys and the Mystery of the Cast Iron Glacier.
		Girl Genius and the Heterodyne Boys are a trademarks of Studio Foglio LLC.
	home.hiwaay.net /~lkseitz/comics/girlgenius/thehb.shtml (654 words)

	heterodyne - OneLook Dictionary Search
		heterodyne : Compact Oxford English Dictionary [home, info]
		Heterodyne : Glossary of video terms [home, info]
		Phrases that include heterodyne: heterodyne oscillator, heterodyne boys, heterodyne detection, heterodyne ladar, heterodyne repeater, more...
	www.onelook.com /?w=heterodyne (205 words)

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