Hawken M B, Stevens A L
J Biomed Eng. 1979 Apr;1(2):116-9. doi: 10.1016/0141-5425(79)90067-0.
The small volume plethysmograph provides a continuous record of the volume of small specimens of composite polymeric dental restorative material as they set. Decreases, from initial volumes of around 100mm3, which occur over several hours can be measured to within +/- 0.1 mm3. The specimen is immersed in mercury which it displaces into a capillary tube. A decrease in specimen volume reduces the height of the mercury column in the capillary tube, and this change is sensed by a strain gauge pressure transducer whose output is recorded. Experience has proved the instrument to be stable and accurate with a linearity over its working range of +/- 0.06mm3.
小型体积描记器可连续记录复合聚合物牙科修复材料小样本固化过程中的体积变化。样本初始体积约为100立方毫米，在数小时内发生的体积减小量可精确测量至±0.1立方毫米以内。样本被浸入汞中，汞被排至毛细管内。样本体积减小会降低毛细管内汞柱的高度，这种变化由应变片压力传感器检测，其输出结果会被记录下来。经验证，该仪器稳定且准确，在其工作范围内的线性度为±0.06立方毫米。
