ultrasound

ultragarsas statusas T sritis apsauga nuo naikinimo priemonių apibrėžtis Negirdimi 20 kHz–1 GHz dažnio virpesiai. Į ultragarsą reaguoja ne tik ausis, bet ir visas žmogaus organizmas. Veikiant ultragarsui, didėja kūno temperatūra, sutrinka pusiausvyros organas, sumažėja girdimumas, pailgėja reakcijos į garso ar šviesos signalą laikas, sumažėja jautrumas skausmui. Taigi ultragarsas veikia centrinę nervų sistemą. Tačiau (kitaip nei infragarsas) šiuos pakenkimus sukelia tiktai ilgalaikis (valanda ir ilgiau) ultragarso poveikis, todėl jo naudojimas naikinimo požiūriu yra neperspektyvus. Ultragarsas plačiai naudojamas karo jūrų laivyne (hidrolokacija, povandeninis garso ryšys, navigacija, ginklo nusitaikymas, tyrimai dideliame gylyje ir pan.), defektoskopijoje, holografijoje, biologijoje, medicinoje ir t. t. atitikmenys: angl. ultrasound rus. ультразвук

Apsaugos nuo naikinimo priemonių enciklopedinis žodynas. – Vilnius: Generolo Jono Žemaičio Lietuvos karo akademija. . 2002.

Look at other dictionaries:

  • ultrasound — 1923, from ULTRA (Cf. ultra ) + SOUND (Cf. sound). Cf. ULTRASONIC (Cf. ultrasonic). In reference to ultrasonic techniques of detection or diagnosis it is recorded from 1958 …   Etymology dictionary

  • ultrasound — ► NOUN ▪ sound or other vibrations having an ultrasonic frequency, particularly as used in medical imaging …   English terms dictionary

  • ultrasound — [ul′trə sound΄] n. 1. ultrasonic waves, used in medical and dental diagnosis and therapy, in cleaning and detecting flaws in metal, etc. 2. the use of ultrasonic waves in ultrasonography to form images of interior body organs, as the uterus or… …   English World dictionary

  • Ultrasound — Not to be confused with Supersonic .Ultrasound is cyclic sound pressure with a frequency greater than the upper limit of human hearing. Although this limit varies from person to person, it is approximately 20 kilohertz (20,000 hertz) in healthy,… …   Wikipedia

  • Ultrasound — High frequency sound waves. Ultrasound waves can be bounced off of tissues using special devices. The echoes are then converted into a picture called a sonogram. Ultrasound imaging, referred to as ultrasonography, allows physicians and patients… …   Medical dictionary

  • ultrasound — /ul treuh sownd /, n. 1. Physics. sound with a frequency greater than 20,000 Hz, approximately the upper limit of human hearing. 2. Med. the application of ultrasonic waves to therapy or diagnostics, as in deep heat treatment of a joint or… …   Universalium

  • ultrasound — ultrasonic waves; n. sound waves of high frequency (above 20 kHz), inaudible to the human ear. Ultrasound in the range 2–20 MHz can be used to produce images of the interior of the human body as the waves reflect off structures back to the probe… …   The new mediacal dictionary

  • ultrasound — ul|tra|sound [ ʌltrə,saund ] noun uncount a way of producing an image of an organ inside someone s body using sound waves: Ultrasound was used to show the size of the tumor. a. ultrasound or ultrasound scan a process in which a part of someone s… …   Usage of the words and phrases in modern English

  • ultrasound — UK [ˈʌltrəˌsaʊnd] / US noun [uncountable] medical a) a way of producing an image of an organ inside someone s body using sound waves Ultrasound was used to show the size of the tumour. b) ultrasound or ultrasound scan a process in which a part of …   English dictionary

  • ultrasound — [[t]ʌ̱ltrəsaʊnd[/t]] N UNCOUNT: usu N n Ultrasound is sound waves which travel at such a high frequency that they cannot be heard by humans. Ultrasound is used in medicine to get pictures of the inside of people s bodies. I had an ultrasound scan …   English dictionary

  • ultrasound — noun Date: 1923 1. vibrations of the same physical nature as sound but with frequencies above the range of human hearing 2. the diagnostic or therapeutic use of ultrasound and especially a noninvasive technique involving the formation of a two… …   New Collegiate Dictionary

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”

We are using cookies for the best presentation of our site. Continuing to use this site, you agree with this.