| 摘要 |
A fluid flow monitoring device. A laser source produces a laser beam having a beam frequency that is transmitted through an optical fiber and absorbed in a small quantity of thermally conductive material having high optical absorption at the beam frequency. A temperature sensor is embedded in the light absorbing material. The light absorbing material is placed in a fluid flow and the light absorbing material is heated with energy in the laser beam. Voltage produced by the temperature sensor is monitored as an indication of the fluid flow. The flow-measuring device can be made extremely unintrusive using very thin temperature sensor wire and very thin optical fiber, both of which are contained within a very thin probe. The device is calibrated under known flow conditions. The flowing fluid cools the material. Using the calibration information, speed of the flowing fluid is determined by measuring the voltage produced by the temperature sensor.
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