共查询到15条相似文献,搜索用时 140 毫秒
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呼吸生理研究和肺功能测定的临床应用近二十年来有了很大的进展,这与不断涌现出新的先进技术与先进方法是分不开的。 SC-8型肺功能色谱仪是用于呼吸生理研究和肺功能测定的临床仪器。两年来的临床应用证明,仪器能满足肺功能测定的要求,使用方便、性能稳定、灵敏度高、重复性好;能快速准确地进行O_2、N_2、CO_2、CO、He等多种气体的分析。 相似文献
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地震科学探测台阵系统是《中国数字地震观测网络工程》的重要组成部分,是开展地震学综合研究的大型野外观测系统。该系统主要由流动观测仪器系统、观测单元监控管理系统、可控震源系统、流动观测技术保障系统、流动观测数据中心和流动观测实验场构成,而流动观测仪器系统是科学探测台阵系统的核心部分,它大多使用CMG-3T甚宽频带地震计或CMG-3ESPC宽频带地震计作为传感器,来完成天然或人工地震数据的采集工作。 相似文献
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液体自动颗粒计数器的性能参数直接决定着仪器的性能,对其测量结果的精度和准确度有着重要影响。详细分析了该仪器的主要性能参数及其对测量结果的影响,并针对仪器的主要性能参数,论述了现有测量技术的原理和方法,分析了仪器的合格指标,对液体自动颗粒计数器的正确使用具有指导意义。 相似文献
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尘埃粒子计数器的性能参数直接决定着仪器的性能,对其测量结果的精度和准确度有着重要影响。分析了该仪器的主要性能参数及其对测量结果的影响,并针对仪器的主要性能参数,论述了现有测量技术的原理和方法,分析了仪器的合格指标,对尘埃粒子计数器的正确使用具有指导意义。 相似文献
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Noninvasive respiratory monitoring system based on the piezoceramic transducer's pyroelectric effect
This paper presents a simple alternative method and system for noninvasive respiratory airflow monitoring. The proposed system uses a piezoceramic transducer to measure respiratory airflow. When a piezoceramic transducer is impacted by respiratory airflow, there is a piezoelectric and a pyroelectric response to pressure and thermal airflow fluctuations. In this study, the selected transducer's response output is dominated by the pyroelectricity factor. Therefore, the piezoelectric effect is not significant and can be ignored in this study. Using the transducer's pyroelectricity to measure thermal flow variations, a subject's respiratory rate and respiratory air volumetric flow rate can be monitored. The proposed system was evaluated for accuracy and response time using quiet and postphysical exertion breathing modes. Using the pneumotach system as a benchmark, the proposed system's respiratory rate measurement accuracy for the two breathing modes is approximately 98.78%. In addition, the proposed system's output voltage is highly correlated with the respiratory volumetric flow rate measured by the selected pneumotach (r2=0.9783). The average correlation coefficient between the pneumotach system's output waveform and the proposed system is approximately 0.9389. Moreover, the proposed system and the selected pneumotach have almost the same rapid response time to respiratory airflow. When compared to a temperature measurement thermistor system, the thermistor on average is approximately 25.3 ms slower than the proposed system. Furthermore, compared to the selected screen-type pneumotach system, the proposed system simplifies the respiration monitoring requirements. Instead of sensing the pressure drop across a mesh screen, like the screen-type pneumotach, it measures respiration at one point within the respiratory airflow. The proposed system benefits from simplified processing circuits and a mesh-free design. The advantages of this new respiratory airflow measurement method are fast response time, high accuracy, low cost, and ease of implementation. 相似文献