弗莱施呼吸流速计的线性度和温度控制

Linearity and temperature control of the Fleisch pneumotachograph.

作者信息

Miller M R, Pincock A C

出版信息

J Appl Physiol (1985). 1986 Feb;60(2):710-5. doi: 10.1152/jappl.1986.60.2.710.

DOI:10.1152/jappl.1986.60.2.710

Abstract

We have investigated the optimal thermal conditions of a Fleisch no. 4 pneumotachograph (PT) necessary for recording maximal forced expiratory maneuvers (MFEM). Our PT assembly was tested with a computer-driven pump and found to be linear up to 14 l/s. Thermocouples (TC) were placed in a peripheral, mid, and a central capillary of the PT. Stable temperature control and consistent PT calibration were best obtained by proportional thermostatic control via the peripheral TC. When the PT was heated to 35 degrees C or above, expirations from either the pump (air at 33 degrees C saturated) or a subject cooled the PT, thus affecting its response. With the PT heated to 30 degrees C, repeated blows caused little change in PT temperature, with no evidence of condensation, thus indicating optimal thermal conditions for recording MFEM.

摘要

我们研究了用于记录最大用力呼气动作（MFEM）的Fleisch 4型呼吸流速仪（PT）的最佳热条件。我们的PT组件通过计算机驱动泵进行测试，发现其在高达14升/秒时呈线性。将热电偶（TC）置于PT的外周、中部和中央毛细管中。通过经由外周TC进行比例恒温控制，可最佳地实现稳定的温度控制和一致的PT校准。当PT加热到35摄氏度或更高时，来自泵（33摄氏度饱和空气）或受试者的呼气会使PT冷却，从而影响其响应。当PT加热到30摄氏度时，重复吹气对PT温度几乎没有影响，也没有冷凝迹象，因此表明这是记录MFEM的最佳热条件。