一、前言 Moser于1966年将固体激光器发展成为目前的激光热导仪,用以测量材料导温系数α和比热C_p,并且用流体静力秤衡法测量密度D,然后根据公式计算导热系数λ=α·C_p·D。λ的精度主要取决于C_p的测量精度。用传统的激光脉冲比较法测量C_p的误差较大,其主要原因一在于,激光器输出能量不稳定和测 I. INTRODUCTION Moser developed a solid-state laser into the current laser thermal conductivity meter in 1966 to measure the material’s thermal conductivity coefficient α and the specific heat C_p, and measured the density D using the hydrostatic balance method, then calculated the thermal conductivity according to the formula λ = α · C_p · D. The accuracy of λ depends mainly on the measurement accuracy of C_p. The traditional laser pulse comparison method to measure the C_p larger error, the main reason is that the laser output energy instability and measurement