会员体验
专利管家(专利管理)
工作空间(专利管理)
风险监控(情报监控)
数据分析(专利分析)
侵权分析(诉讼无效)
联系我们
交流群
官方交流:
QQ群: 891211   
微信请扫码    >>>
现在联系顾问~
热词
    • 10. 发明授权
    • Photothermal deflection method of measuring fluid velocity
    • 测量流体速度的光热偏转方法
    • US4654803A
    • 1987-03-31
    • US648830
    • 1984-09-10
    • Jeffrey A. Sell
    • Jeffrey A. Sell
    • G01P5/10G01F1/68G01N21/41
    • G01P5/10
    • A method of measuring the velocity of a fluid by noninstrusive means comprises passing a pump laser beam pulse through the fluid wherein the fluid contains a constituent absorbing the wavelength of the laser so that a temperature gradient, and therefore an index of refraction gradient, occurs in the laser beam path; and a probe laser beam is passed transverse to the pump laser beam and is deflected by the heated portion of the fluid; measuring the beam deflection and calculating from that the fluid velocity. After the pump pulse the amount of deflection reaches a peak value and then decreases at a rate independent of the concentration of the absorbing constituent. Where the pump laser beam has a Gaussian spatial profile, the deflection signal decreases according to: exp-2(v+/a).sup.2, where v is the velocity; t is time; and a is a constant representing the pump laser beam radius. The apparatus is similar to that used for photothermal deflection spectroscopy and involves a pair of crossed laser beams--one for pumping the medium and one for probing the medium; a probe beam deflection sensor; and electronic circuitry for analyzing the measured deflection signal.
    • 通过非引入装置测量流体的速度的方法包括将泵激光束脉冲通过流体,其中流体包含吸收激光波长的成分,使得温度梯度因此发生折射率梯度 激光束路径; 并且探针激光束横向于泵浦激光束通过,并被流体的加热部分偏转; 测量光束偏转并从流体速度计算。 在泵浦脉冲之后,偏转量达到峰值,然后以与吸收成分浓度无关的速率降低。 在泵激光束具有高斯空间分布的情况下,偏转信号根据exp-2(v + / a)2减小,其中v是速度; 是时候了 a是表示泵激光束半径的常数。 该装置类似于用于光热偏转光谱的装置,并且包括一对交叉的激光束 - 一个用于泵送介质,一个用于探测介质; 探头光束偏转传感器; 以及用于分析所测量的偏转信号的电子电路。