D-H parameter method is employed to conduct forward kinematic analysis of the dexterous hand in this article, in order to obtain the mechanical performance of the SMA biomimetic flexible dexterous hand for object grasping. The D-H parameters of the dexterous hand are determined, and the position expression of the fingertip relative to the base coordinate is obtained through theoretical calculations. Furthermore, inverse kinematic theoretical analysis of the biomimetic dexterous hand is conducted to obtain the joint angle parameters of each finger. A forward kinematic simulation model of the biomimetic dexterous hand is established, and the relationship between finger joint angles and fingertip position curves is obtained through simulation. The simulation results are compared with the theoretical analysis results to validate the correctness of the kinematic analysis of the dexterous hand, providing insights for its optimized design.
This article develops a novel calibration method to calibrate automatic catchweighing instrument by studying the principle of the instrument, and using standard weights and test loads as calibration apparatus. The method evaluates the metrological performance of automatic catchweighing instrument by calibrating the weighing error in static operation, the weighing error and measurement repeatability in automatic operation, and the eccentricity both in static and automatic operation. The experimental results show that this method can effectively evaluate the metrological performance of automatic catchweighing instrument, and is of great significance to the quality control and metrological traceability of the instrument.
This article presents a novel design of reference optical simulator and physical calibration method for optical performance evaluation of real-time fluorescent quantitative PCR analyzer in order to substitute for traditional chemical method. The optical simulator is designed according to the working principle, and technical characteristics such as fluorescence peak height consistency among channels, linear sensitivity factor, fluorescence intensity repeatability, and linear correlation coefficient of fluorescence of real-time fluorescent quantitative PCR analyzer.The calibration results of 5 typical types of real-time fluorescent quantitative PCR analyzers show that the reference optical simulator presented in this article can well simulate different fluorescent dyes. The reference optical simulator can meet the requirements of fluorescent intensity calibration for real-time fluorescent quantitative PCR analyzers with the advantages of good applicability, high convenience and accurate and reliable measurement results.
Ophthalmic ultrasonic B-mode diagnostic device is widely used in medical institutions. “penetration depth”, “resolution”, “dead zone” and “geometric position accuracy” are the key technical parameters to evaluate the metrological performance of the device. However, until now no national or local metrological specifications applicable to ophthalmic ultrasonic B-mode diagnostic device has been issued in China, and the corresponding traceability system of the device has not been established either. The novel calibration procedure presented in this article has been performed on several typical types of ophthalmic ultrasonic B-mode diagnostic devices widely used in China, and the experimental results show that the calibration method presented in this article can be adopted for the periodic calibration of ophthalmic ultrasonic B-mode diagnostic device, in order to establish the metrological traceability system of the device.
3D ultrasonic diagnostic equipment is widely used in medical institutions. “volume reconstruction” and “slice thickness” are the key technical parameters to evaluate the metrological performance of the equipment. However, until now no national or local metrological specifications applicable to 3D ultrasonic diagnostic equipment have been issued in China, and the corresponding traceability system of the equipment has not been established either. The novel calibration procedure presented in this article has been performed on several typical types of 3D ultrasonic diagnostic equipment widely used in China. The experimental results show that the calibration method presented in this article can be adopted for the periodic calibration of 3D ultrasonic diagnostic equipment, in order to establish the metrological traceability system of the equipment.
Radio frequency ablation instrument is a kind of surgical equipment widely used in medical institutions, and output power is one of the most important technical parameters of this instrument. However, until now, there is no corresponding verification regulation or calibration specification for the validation of metrological traceability and performance reliability of such instruments. By analyzing the measurement principle of quality analyzer for electrosurgical generator and the output power range of radio frequency ablation instrument, this article presents a solution, which is to test the output power of radio frequency ablation instrument according to JJF 1217-2009 Calibration Specification for Electrosurgical Generator, and the feasibility of the design is evaluated as well bycomparing the test results with the data acquired by following measurement procedure recommended by industry standards to confirm the feasibility of the novel design.
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