A new electropneumatic flowmeter for the body plethysmograph.

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Abstract
A new flowmeter is described to be used with the body plethysmograph during the nitrous oxide technique for instantaneous pulmonary capillary blood flow measurements in man. It incorporates an optical pressure-sensing unit, an operational amplifier, and an electropneumatic transducer. The gas flow necessary to maintain atmospheric pressure within the plethysmograph is regulated by the electropneumatic transducer which is driven by the amplified output of the optical unit. This unit detects pressure changes within the body plethysmograph and its output is also used for recording. An electronic filter network enables selection of the desired frequency response. This device, while it is similar in principle and has the same dynamic performance as the previously described servopneumatic flowmeter, has the advantage that it is simple to use and maintain and easier to construct since it utilizes mostly commercially available components.

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