A nanoscale high reference material is a physical reference material with a specific value, mainly used for the transfer and calibration of relevant nanometric instruments. this paper develops a probe scanning atomic force microscopes (AFM) system for step height topography characterization. Firstly, the step standard template is proposed, and the computation time is reduced by iterative approach. Second, the principle of AFM and the roughness measurement method are investigated. Finally, the same step height is compared and measured using AFM. The results show that the maximum standard deviation of the AFM is around 0.015.
This article presents a novel design of integrated human vital signs simulator, whose function includes the simulation of blood oxygen, blood pressure and ECG. According to the light transmission model basing on the optical properties of biological tissues, the pulse oximetry simulation module is designed, including its overall structure, a analog finger, a light source driving circuit, etc. The non-invasive blood pressure simulation module is designed basing on oscillographic method, and a piston rod type variable air chamber pulse waveform generation mechanism is included, using PWM constant current control and ultra small subdivision technology to control the linear motor to achieve stable and accurate displacement, and the pulse wave is simulated according to the blood pressure envelope. ECG verification waveform is generated by STM32F407 chip basing on ARM. The experimental verification results show that the designed simulator can meet the requirements of JJF 1470-2014 Calibration Specification for Multiparameter Physiological Simulators, and can complete the measurements efficiently and accurately.
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