Vanggaard L, Ostergaard J
Aviat Space Environ Med. 1977 Apr;48(4):308-10.
Where volume changes are recorded as the concomitant changes in pressure, modern, fast-responding pressure transducers might record not only the pressure changes due to volume changes in the measured object but also the heat of compression, showing itself as an overshoot or hysteresis phenomenon in the calibration curves. Introduction of an effective heat sink (e.g. copper mesh) within the air space in the plethysmograph might absorb this heat and thereby diminish the overshoot phenomena. The effect is not of practical importance in classical venous occlusion plethysmography where rapid changes only contribute to a smaller part of the total volume change during venous occlusion. When rapid changes, as in volume pulse recordings, are to be evaluated, the effect must be taken into consideration and should be reduced.
当体积变化被记录为压力的伴随变化时，现代的快速响应压力传感器不仅可能记录由于被测物体体积变化引起的压力变化，还可能记录压缩热，这在校准曲线中表现为过冲或滞后现象。在体积描记器的气腔内引入有效的散热器（如铜网）可能会吸收这种热量，从而减少过冲现象。在经典的静脉阻塞体积描记术中，这种影响并不具有实际重要性，因为在静脉阻塞期间，快速变化仅占总体积变化的较小部分。当要评估像容积脉搏记录中的快速变化时，必须考虑这种影响并应予以减小。
