A LOW-NOISE ELECTROMETER FOR AN AUTOMATED OEC MEASUREMENT SYSTEM

用于自动 OEC 测量系统的低噪声静电计

• 批准号: 3896181
• 负责人: H E CASCIO
• 金额: --
• 依托单位: NATIONAL CENTER FOR RESEARCH RESOURCES
• 依托单位国家: 美国
• 资助国家: 美国
• 起止时间: 至
• 项目状态: 未结题
• 来源: https://reporter.nih.gov/project-details/3896181
• 关键词: carbon dioxide; clinical biomedical equipment; computer program /software; electrodes; hemoglobin; human tissue; magnetic field; microelectrodes; monitoring device; oxygen microelectrode; oxygen tension; personal computers; respiratory oxygen

Measurement of the hemoglobin oxygen equilibrium curve (OEC) in an automated system is hampered by noise. To obtain reliable results in reading partial pressures with an accuracy of 0.01 mmHg requires special techniques in electronic circuit design. The p02, pH, and the pCO2 electrodes have very high internal resistance with very low output signal levels. When these devices are used in an environment contaminated by radio frequency interference (RFI) from a computer, the magnetic fields of stepping motors, as well as power line transients generated by 'a high current water bath, the electrode output leads must be kept short and shielded. The electrode signals must be kept scaled and offset by a computer-controlled signal processor that properly interfaces these voltages to an AT-type personal computer, for further software analysis. Another task to be performed is the designing and fabrication of the required circuitry for the development of the automated system to perform the desired measurements.

血红蛋白氧平衡曲线（OEC）的测定