| 释义 |
velocimeter|vɛləˈsɪmɪtə(r)|
[f. L. vēlōci-, vēlox swift + -meter.]
An instrument or apparatus (variously constructed) for measuring the speed or velocity of engines, vessels, projectiles, etc.
1842H. Spencer in Civil Eng. & Arch. Jrnl. V. 231/2 The instrument represented in the annexed plate, which I have named a ‘Velocimeter’, is intended to supersede the long calculations, frequently necessary, in obtaining velocities in engine trials. 1853in Abridgm. Specif. Patents, Opt. etc. Instrum. (1875) 183 An instrument for measuring the steerage-way of vessels... [The apparatus is called a] Velocimeter. 1876Catal. Sci. Appar. S. Kens. 55 Patent electric Velocimeter,..arranged for water currents and ascertaining the speed of vessels.
Hence veloˈcimetry, the measurement of speed, esp. speed of flow, by special techniques.
1969IEEE Trans. Aerospace & Electronic Systems V. 687/1 (heading) Fundamentals of holographic velocimetry. 1978Sci. Amer. Aug. 30/3 Swedish and Japanese workers have been testing laser velocimetry, a technique that utilizes the reflection of light from small particles in the flow to determine the magnitude and direction of the circulatory patterns. 1980Recent Adv. Surg. X. 84 The first to apply the technique of Doppler ultrasound velocimetry to the detection of pulsatile arterial flow in the digital vessels. |