Swanson G D, Arena L, Arancibia A B, Bellville J W
J Appl Physiol. 1976 Nov;41(5 Pt. 1):781-3. doi: 10.1152/jappl.1976.41.5.781.
This paper describes an amplifier and linearizer for the Beckman LB-1 carbon dioxide analyzer head. All electronics are solid state and DC regulated in contrast to the original LB-1 amplifier which was of vacuum tube design and AC regulated largely by means of a voltage stabilizer transformer. A new detection principle is adopted which reduces drift due to mechanical imperfections of the chopper motor (e.g., bearing drag), but also offers the advantage that the phasing of the chopper blades is no longer necessary. Furthermore, the amplifier with a digital readout and an end-tidal hold circuit can be built for less than $500 and is plug compatible with the LB-1 head.
本文介绍了一种用于贝克曼LB - 1二氧化碳分析仪探头的放大器和线性化器。与原始的LB - 1放大器相比，所有电子元件均为固态且直流稳压，原始的LB - 1放大器采用真空管设计，主要通过稳压器变压器进行交流稳压。采用了一种新的检测原理，该原理减少了由于斩波器电机机械缺陷（如轴承摩擦）引起的漂移，而且还具有不再需要对斩波器叶片进行定相的优点。此外，带有数字读数和潮气末保持电路的放大器造价可低于500美元，并且与LB - 1探头插头兼容。
