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Precautions for High-Temperature Ultrasonic Probes
Release time:
2025-03-12 09:39
High-temperature ultrasonic transducers can measure workpiece temperatures up to 480 degrees. When used with an ultrasonic thickness gauge, they can measure the thickness of high-temperature workpieces. The following points should be noted when measuring high-temperature workpieces:
1. For high-temperature piezoelectric ceramics, it is crucial to ensure that the temperature of the material being measured does not exceed the maximum temperature that the transducer can measure. Since the Curie temperature of general piezoelectric ceramics is only 480℃ (imported materials can reach below 500℃), the actual temperature that the piezoelectric ceramic endures should be much lower than the Curie temperature. Therefore, high-temperature thickness measurement can only be achieved by intermittent operation to shorten the heat conduction time and improve heat dissipation. Otherwise, the piezoelectric ceramic will lose its piezoelectric effect due to depolarization.
2. Apply a 0.5mm thick layer of high-temperature couplant (high-temperature grease) to the transducer detection surface, then contact and press it against the hot material surface. Immediately detach from the hot material when a stable reading is displayed; the contact time with the workpiece should be as short as possible, ideally within 5 seconds. The higher the temperature, the faster the action should be. Even at lower temperatures, the contact time should not exceed 10 seconds. The interval between measurements should be three minutes. At higher temperatures, this interval should be extended appropriately; at lower temperatures, the interval should not be less than one minute. Users should shorten the contact time to reduce heat conduction and extend the interval between measurements to ensure sufficient heat dissipation based on the specific conditions of the hot material. This will extend the service life of the high-temperature probe.
3. High-temperature sound velocity compensation: Since the speed of sound in the material slows down after heating, when setting the sound velocity, the sound velocity reduction coefficient due to material heating should be considered, or the sound velocity can be set at room temperature, and the measured result divided by the coefficient. This coefficient is: 125℃ is 0.99, 225℃ is 0.98, 25℃ is 0.97, 25℃ is 0.96, 25℃ is 0.95. For example, if the sound velocity of a material at room temperature is 5900 m, the measured thickness is 100mm, and the temperature is heated to 225℃, the thickness reading is 98mm. The sound velocity can be set at 5900 x 0.98 = 5782 m, or the sound velocity remains unchanged, and the measured 98mm is divided by 0.98.
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