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Topic: Continuous wave


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In the News (Fri 24 May 19)

  
  Encyclopedia article: Continuous wave   (Site not responding. Last check: 2007-11-07)
Continuous wave is also the name given to an early method of radio (A communication system based on broadcasting electromagnetic waves) transmission (Communication by means of transmitted signals), in which a carrier wave (A radio wave that can be modulated in order to transmit a signal) is switched on and off.
Strictly speaking, a keyed carrier may be referred to as "ICW" for "Interrupted continuous wave" but the necessity of keying is usually understood.
CW is the basis of the continuous-wave radar (additional info and facts about continuous-wave radar) system, where a continuous wave is transmitted by one aerial (An electrical device that sends or receives radio or television signals) while a second aerial receives the reflected radio (A communication system based on broadcasting electromagnetic waves) energy.
www.absoluteastronomy.com /encyclopedia/c/co/continuous_wave.htm   (390 words)

  
 Continuous wave - Wikipedia, the free encyclopedia
A continuous wave (CW) (or Continous Waveform) is an electromagnetic wave of constant amplitude and frequency; and in mathematical analysis, of infinite duration.
Continuous wave is also the name given to an early method of radio transmission, in which a carrier wave is switched on and off.
This mode is still in common use by amateur radio operators due to its simplicity and reliability CW is the basis of the continuous-wave radar system, where a continuous wave is transmitted by one aerial while a second aerial receives the reflected radio energy.
en.wikipedia.org /wiki/Continuous_wave   (518 words)

  
 AllRefer.com - shock wave (Aviation, General) - Encyclopedia
shock wave, wave formed of a zone of extremely high pressure within a fluid, especially the atmosphere, that propagates through the fluid at a speed in excess of the speed of sound.
A shock wave is caused by the sudden, violent disturbance of a fluid, such as that created by a powerful explosion or by the supersonic flow of the fluid over a solid object.
Continuous shock waves, such as those produced by supersonic aircraft, are of particular concern as they tend to recur along regular routes.
reference.allrefer.com /encyclopedia/S/shockwav.html   (266 words)

  
 [No title]   (Site not responding. Last check: 2007-11-07)
The acoustic energy generator continuously produces acoustic energy to be non-invasively applied to the injection mold and polymer as it is delivered into the mold.
Continuous waves, on the other hand, are much less complex to generate in hardware and to observe as compared to pulsed ultrasound waves.
This allowed the ultrasonic wave from the ultrasonic crystal to be transmitted normal to the cavity surface striking centered on the mold cavity near an endgate of an endgated tensile specimen mold.
www.wipo.int /cgi-pct/guest/getbykey5?KEY=03/89214.031030&ELEMENT_SET=DECL   (4451 words)

  
 Continuous wave - Computing Reference - eLook.org
A spark gap initiates a ringing, damped sinusoidal wave in a tuned circuit consisting of an inductor and capacitor.
In contrast, a vacuum-tube oscillator constantly adds energy to the tuned circuit, compensating for the amount coupled to the antenna, and the transmitted energy or "wave," is therefore "continuous".
Many (especially radio amateurs) continue to understand "CW" to mean transmission by means a signal of a single frequency which is either on or off (e.g.
www.elook.org /computing/continuous-wave.htm   (167 words)

  
 Continuous wave - Wikipedia, the free encyclopedia - TESTVERSION   (Site not responding. Last check: 2007-11-07)
Continuous wave is also the name given to an early method of radio transmission, in which an unmodulated carrier wave is switched on and off.
Unlike modulated modes, there is no information (in the communications sense) embedded within the signal; rather, information is carried in the rhythm and spacing with which the signal is sent.
CW is the basis of the continuous-wave radar system, where a continuous wave is transmitted by one aerial while a second aerial receives the reflected radio energy.
www.wissen-im-web.net /wiki/Cw   (246 words)

  
 TFCBooks -- Tesla Site Glossary
Faraday rotation The orientation of the electric field vector of an electromagnetic wave propagating parallel to a magnetic field embedded in a plasma rotates as the wave propagates.
Norton surface wave The ground-wave component of a space wave resulting from refraction of a portion of the reflected-wave component at the Earth-atmosphere interface and induction of electrical currents in the ground.
The path traveled by the wave in getting from one point to another is known as the propagation path (such as the path through the atmosphere in getting from a transmitting antenna to a receiving antenna, or the path through the waveguides and other microwave devices in getting from an antenna to a receiver).
www.tfcbooks.com /mainpage/glossary.htm   (12184 words)

  
 Continuous Wave Transmission by Amateurs (1922)
The advantages of continuous wave transmission, especially its economy and greater flexibility as compared to spark transmission, made its general use by amateurs highly desirable.
The antenna current on this wave length being two amperes, it was found entirely possible to work 100 miles in daylight on this wave length without trouble with that amount of current in the antenna.
When the transmitter was adjusted to a wave length of 175 meters it was found, in at least three instances, that the receiving operators had to adjust their secondary circuit variometers at zero in order to hear the signals.
earlyradiohistory.us /1922smit.htm   (2639 words)

  
 Children's Heart Institute | Cardiac Testing: Echocardiography - Sound
P-Wave: This is the sound of blood flow through the Mitral Valve utilizing the pulsed wave.
C-Wave: This is the sound of the Tricuspid Valve using continuous wave.
P-Wave: This is the sound of blood flow across the Pulmonic Valve utilizing pulsed wave.
www.childrenheartinstitute.org /testing/echo/echosnd.htm   (254 words)

  
 Continuous-wave Nd:Yag laser hyperthermia: a successful modality in treatment of basal cell carcinoma
The aim of the present study was to evaluate the therapeutic efficacy of continuous wave Nd:Yag laser-induced hyperthermia in treatment of basal cell carcinoma (BCC).
Continuous wave Nd:Yag laser-induced hyperthermia should be considered as an alternative treatment for BCC.
Treatment by continuous-wave Nd:YAG laser hyperthermia in 37 patients with BCC who were followed clinically and histopathologically for 5 years revealed complete disappearance of the lesion in 36 patients (97 %) and a recurrence in one patient (3 %).Treatment by radiation and by topical 5-fluorouracil achieved 9-percent and 80-percent cure rates, respectively [13, 14].
dermatology.cdlib.org /102/therapy/laserthermia/eltonsy.html   (2978 words)

  
 Discretizing the wave equation
Discrete wave models can be studied to understand their intrinsic properties and not just how they can be used to model a continuous reality that may not exist.
The equation says the rate at which the level is accelerating in time at a give point is proportional to the sum of the rates at which the level is accelerating across each dimension in space at that point.
The wave equation is the universal equation of physics.
www.mtnmath.com /whatrh/node66.html   (708 words)

  
 Continuous Wave Receivers
If a receiving antenna and associated receiver circuits containing a simple rectifier are tuned to a continuous wave transmitter, the receiving telephone will be transversed by a uni-directional current and therefore the telephone emits no sound.
But if by local means we cause the amplitude of these to fluctuate periodically at an audio frequency sound will be produced because the telephone diaphragm will be deflected at rates varying as the periodic fluctuations of the rectified current.
These oscillations interacting with the oscillations of the incoming signal produce beats in the detector circuits which in turn are detected by the valve.
hjem.get2net.dk /helthansen/continous_wave_rec.htm   (646 words)

  
 Continuous Wave Radar
The Doppler shift is a change in the frequency of the electromagnetic wave caused by motion of the transmitter, target or both.
However, they are not suitable for long range detection, because the continuous power level they transmit at must be considerably lower than the peak power of a pulsed system.
For a continuous wave system, the duty cycle is one, or alternatively, the peak power is the same as the average power.
www.fas.org /man/dod-101/navy/docs/es310/cwradar/cwradar.htm   (1018 words)

  
 Pulsed and Continuous Wave Doppler - Pulsed Wave Doppler
Pulsed and Continuous Wave Doppler - Pulsed Wave Doppler
Pulsed wave (PW) Doppler systems use a transducer that alternates transmission and reception of ultrasound in a way similar to the M-mode transducer (Fig.
The various differences between pulsed and continuous wave Doppler are summarized in Figure 1.23.
www.echoincontext.com /doppler01/doppler01_10.asp   (793 words)

  
 Response to "24 bit, 44.1kHz"   (Site not responding. Last check: 2007-11-07)
Your perfect half-cycle of a sine wave, with infinite precision, can never exist in nature; and thus we shouldn't be worried about not being able to sample it.
In digital, we could indeed create a "bump wave" you describe by copying and repeatedly pasting the positive section of a sine wave.
Individual samples should always be thought of as being part of a continuous wave.
www.prorec.com /prorec/prorecording.nsf/All/4F97DE7426B2C2D486256F0F00256F76?OpenDocument   (289 words)

  
 Liti Holographics - 3D holograms for a 3D world
Holographers use two kinds of lasers to produce holograms: the continuous wave laser and the pulsed laser.
The continuous wave laser emits a steady stream of laser light, whereas the pulsed laser emits laser light in bursts.
Because it is absolutely critical that there is no motion at all, subjects that are holographed with continuous wave lasers must be ‘dead' or immobile objects that can be bolted or glued to the optical table surface.
www.litiholographics.com /technology/tech_lasers.htm   (313 words)

  
 Pulsed and Continuous - Continuous Wave Doppler
There are two main types of Doppler echocardiographic systems in common use today, continuous wave and pulsed wave.
Continuous wave (CW) Doppler is the older and electronically more simple of the two kinds.
As the name implies, CW Doppler involves continuous generation of ultrasound waves coupled with continuous ultrasound reception.
www.echoincontext.com /doppler01/doppler01_09.asp   (473 words)

  
 CLPX-Ground: Ground-Based Frequency Modulated Continuous Wave (FMCW) Radar
The microwave interaction with a snow pack was measured using broadband frequency modulated continuous wave (FMCW) radar operating at between 2 and 18 GHz, incorporating the following frequencies: C-Band (2-6 GHz), X-Band (8-12 GHz), and Ku-Band (14-18 GHz).
This data set presents frequency modulated continuous wave radar profiles (frequency differences represent various discontinuities in the snowpack).
Density measurements from a nearby snowpit were used to estimate the wave velocity, so that the frequency scale could be converted to an approximate depth scale.
nsidc.org /data/docs/daac/nsidc0164_clpx_fmcw   (2738 words)

  
 ipedia.com: Continuous wave Article   (Site not responding. Last check: 2007-11-07)
Continuous wave, the first method of radio transmission, consists of an unmodulated carrier wave ; unlike modulated modes, it has no information embedded within the signal; information is carried in t...
Continuous wave (CW), the first method of radio transmission, consists of an unmodulated carrier wave; unlike modulated modes, it has no information (in the communications sense) embedded within the signal; information is carried in the rhythm and spacing with which the signal is sent.
It was called radiotelegraphy because like the telegraph, it worked by simple on/off means to transmit Morse code.
www.ipedia.com /continuous_wave.html   (212 words)

  
 eMedicine - Lasers, General Principles and Physics : Article by Steve Lee, MD   (Site not responding. Last check: 2007-11-07)
The theoretic principles behind the laser were developed as early as 1917, when Einstein laid the groundwork for stimulated emission in his treatise "On the Quantum Theory of Radiation." In 1955, Gordon produced the maser, the microwave predecessor of the laser.
This energy is in the form of an intense beam of monochromatic (same wavelength), collimated (parallel, nondiverging), and coherent (same direction) light (see Image 4).
A CW laser is generated by continuously pumping energy into the active medium to achieve an equilibrium between the number of atoms raised to the excited state and the number of photons emitted.
www.emedicine.com /ent/topic40.htm   (4053 words)

  
 Continuous-wave ultrasonic modulation of scattered laser light to   (Site not responding. Last check: 2007-11-07)
Continuous-wave ultrasonic modulation of scattered laser light has been used to image objects in tissue-simulating turbid media for what is to our knowledge the first time.
The ultrasound wave focused into the turbid media modulates the laser light passing through the ultrasonic focal zone.
The modulated laser light collected by a photomultiplier tube reflects the local mechanical and optical properties in the focal zone.
omlc.ogi.edu /pubs/abs/wang95a.html   (140 words)

  
 JRS: Laser Thermal Keratoplasty Using a Continuous Wave Diode Laser
A continuous wave laser source meets the coagulation requirements more effectively by avoiding tissue cooling by thermal diffusion as well as the peak temperatures of pulsed lasers, which counteracts the intended central corneal steepening.
A continuous wave diode laser was developed, emitting at 1.885 µm with a maximal energy output of 450 mW.
Using laser parameters, comparable to those used for a pulsed Ho:YAG laser in contact mode, coagulation spots in human cornea were applied for the continuous wave diode laser.
www.slackinc.com /EYE/jrs/vol152/bende.htm   (307 words)

  
 Continuous sin wave generation without buffer
I am using Labview 6.0.2 Base version, without Sine Waveform.vi (I have Simple Sine waveform, and Sine wave) but these functions are not the same as Sine Waveform.vi.
I need a continuous sin wave that still maintains it's shape at 400 Hz.
I have made a continous wave using a buffer and for loop, but it looks more like a sawtooth wave.
www.codecomments.com /message199342.html   (293 words)

  
 Georgia Tech: Principles of Continuous Wave (CW) Radar   (Site not responding. Last check: 2007-11-07)
The Continuous Wave (CW) Radar course includes both theory and applications.
The Frequency Modulated Continuous Wave (FMCW) waveform is compared to other wideband waveforms.
He has co-developed courses in radar signal processing and imaging at both the graduate and continuing education levels.
www.pe.gatech.edu /conted/servlet/edu.gatech.conted.course.ViewCourseDetails?COURSE_ID=77   (881 words)

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