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Equipment for measuring temperatures of phase transformation in Thin Films or Surface Coatings based on the Detection optoacustica piezoelectric Resonant
Equipment for measuring temperatures of phase transformation in Thin Films or Surface Coatings based on the Detection optoacustica piezoelectric Resonant
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机译：基于检测光声压电谐振器的薄膜或表面涂层相变温度测量设备
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摘要
This is a low power laser Modulated or Pulsed at a Frequency F which heats dimly The Surface to be measured, a device that communicates with a piezoelectric detector shows the sound resonates at the same Frequency F, an oven that controls and varies the tempera Ture of the sample and a phase Sensitive detector.The Surface to be heated by the sample expands, apagarase Cooling back to the laser. This process is repeated at the frequency F, giving rise to the emission of Sound that is detected by the piezoelectric Transducer, which delivers an electrical Signal oscillating at Frequency F.The Electronic Detection Filters the signal by removing most of the noise, allowing to determine the amplitude and phase of the contribution of the sample to the sound Frequency F. this termoelu00e1sticas Signal depends on the properties of the sample surface and will change if there is a trans Thermodynamics of Phase formation on the surface.The sample is placed in an oven that varies with the temperature of the temperature at which the change occurs Signal.
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