continuous wave

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continuous wave

[kən¦tin·yə·wəs ′wāv]
(electromagnetism)
A radio or radar wave whose successive sinusoidal oscillations are identical under steady-state conditions. Abbreviated CW. Also known as type A wave.

continuous wave

(communications)
(CW) A term from early radio history, when the spark gap method of transmission was replaced by vacuum-tube oscillators. A spark gap initiates a ringing, damped sinusoidal wave in a tuned circuit consisting of an inductor and capacitor. The energy in this circuit is constantly changing between the capacitor's electrostatic field and the inductor's magnetic field. The energy is then coupled, loosely (so as not to dampen the wave too quickly), to the radiating antenna.

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. Morse code), as opposed to a carrier which varies continuously in amplitude, frequency or phase. Some would even call the former "unmodulated" even though turning on and off is actually an extreme form of amplitude modulation.
References in periodicals archive ?
5 W power output at continuous-wave operation, which is packaged in a 5.
The ML9XX37 continuous-wave DFB laser diode is supplied with a carrier for easy handling and to enable chip-on-carrier production.
Continuous-wave Doppler ultrasound transducers, mounted at the tip of an easy-to-use, patient- dedicated esophageal probe, are used to monitor blood-flow signals from the patient's descending aorta.
Continuous-wave Doppler ultrasound transducers, mounted at the tip of an easy-to-use, patient-dedicated esophageal probe, are used to monitor blood-flow signals from the patient's descending aorta.
of the first room-temperature continuous-wave semiconductor
It also makes continuous-wave (CW) and channel-power measurements on multiple channels with high accuracy for cell-site evaluation and interference management.
The same sensor also measures multi-tone and continuous-wave (CW) signals.
The new MRI technique, called inert gas imaging (IGI), employs intense light from high-power, continuous-wave (CW) lasers developed by Opto Power, which designs and manufactures high-performance semiconductor lasers.
Panish - for conception and development of the first room- temperature continuous-wave semiconductor injection laser with double heterostructure;
Varian's goal is to produce a gyrotron capable of delivering one megawatt continuous-wave power production.
Contract Awarded for Continuous-wave ultraviolet laser

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