Pyroelectric detector-based thin sample heat conductivity measurement device and method thereof

Abstract

The invention discloses a pyroelectric detector-based thin sample heat conductivity measurement device and a method thereof, and belongs to the technical field of thin sample heat conductivity measurement devices and methods thereof, aiming at solving the problems that the heat conductivity of a thin sample cannot be accurately measured because of complicated operation, low measurement speed and requirement for half-temperature rise time. The device comprises a signal generator, an infrared pulse laser, a semi-reflecting and semi-transmitting beam splitter, a testing film sample, a testing pyroelectric detector, a reference pyroelectric detector and an oscilloscope, wherein the infrared pulse laser is controlled by the signal generated by the signal generator to output a required waveform; the wave is split into two light beams by the semi-reflecting and semi-transporting light splitter and is irradiated to the testing pyroelectric detector carrying the to-be-detected material and the reference pyroelectric detector to obtain a voltage response signal; two paths of voltage signals have different responses due to different heat conductivities, and the heat conductivity can be obtained through responding full temperature rise difference. The device can be used for measuring the heat conductivity of a film sample.

Description

technical field [0001] The invention relates to a thin sample thermal conductivity measurement device based on a pyroelectric detector, which is used for measuring the thermal conductivity of a thin sample, and belongs to the technical field of thin sample thermal conductivity measurement devices and methods thereof. Background technique [0002] Thermal conductivity, also known as thermal conductivity, reflects the heat conduction ability of a substance. According to Fourier's law, it is defined as the energy transferred by a unit temperature gradient through a unit heat transfer surface in a unit time. It characterizes the heat transfer performance and temperature equilibrium performance of materials, and has important applications in engineering fields such as materials, energy, construction, aviation, chemical industry, and refrigeration. Its test method has always been one of the hot spots of research. Existing measurement methods mainly fall into two categories: steady...

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Problems solved by technology

[0004] The present invention provides a thin sample thermal conductivity measurement device and method based on pyroelectric detectors to solve the problem of measuring the thermal conductivity of thin film samples in the prior art due to the need to obtain the half temperature rise. The problems of time and air layer will become more obvious with the increase of the number of sample layers, resulting in relatively large errors in time measurement, resulting in complicated operations, high costs, and the inability to quickly and accurately measure the thermal conductivity of thin film samples

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