| 摘要 |
Hot target ultrasonic measurement system in which an ultrasonic transducer for transmitting ultrasonic energy along a measuring path toward the hot steel ingot target receives a reflection echo of ultrasonic energy from the hot target along the measuring path, and electronic circuit for determining the range to the hot target from the time of transmission of said ultrasonic energy to the receipt of reflection of ultrasonic energy from said target. The temperature or speed of sound in the media in the measuring path is measured and used in the range measurement. A source of fluid measuring path media under pressure forms a column of fluid measuring path media is projected from the ultrasonic transducer to impinge on the hot target to enhance the accuracy of range measurements by minimizing the effect of temperature gradients due to the heat radiated from said hot target in said measuring path and narrow the distribution of reflection echo amplitudes, provide a more stable range of measurements and improve precision of range measurement by enhancing the accuracy of speed of sound in the media measurement.
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