Abstract:In this paper, a method of using the ratio of Bessel Function to estimate the optical phase shift of the interference type optical fiber hydrophone is described, thereby the phase shift sensitivity of the hydrophone has been got- The theory model has been simulated and the practical calibration of a push-pull type optical fiber interference homodyne-hydrophone has been done.

Abstract:Applying area method, a auxiliary index of roundness evaluation is put forward tocompensate the deficit of the current roundness allowance evaluation and then this auxi1iary index isapplied to the measurement experiment of roundness allowance.

Abstract:The different types of spatial coordinate transformation and the relation between them are analyzed systematically in this paper. Using the rotation matrix theory,the deep search is done and the attentive problems during use are pointed out- The useful concepts of homogeneous matrix, differential movement,differential operator and Jacobi matrix etc. are proposed. The application of these concepts to robotics is discussed.

Abstract:分析了LXJ－40离心机光栅测速系统的特点，并从测速信号质量要求出发，分析了出现稳速系统锁相环“滑相”现象及在高速（180～202r／min）中“飞车”现象的原因，提出了提高LXJ－40离心机光栅测速系统信号质量的方法。

Abstract:A new method for measuring He-Ne laser power by using illuminometer is introduced in this paper.

Abstract:In this paper , the 8902A measuring receiver as the high frequency medium and low voltages standard is analyzed and studied .A kind of new method for verifying ultrahigh frequency millivoltmeter is iutroduced and experiment data are provided. The uncertainty of this standard equipment is analyzed.

Abstract:This paper introduces the measuring method for the parallelism of 1ine to spatial turningspindle axis. The error of measurement is analyzed also.

Abstract:In this paper,the evaluation course of DC gain and offset of linear measurement system using the least square method is described,the uncertainty analysis of the evaluation is discussed,and in the meantime an example of evaluation and analysis is introduced in detail. The course and results can be used in the uncertainty analysis of some measurement standard or the uncertainty ana1ysis of gain and offset themselves.

Abstract:The system configuration and its software design of a data acquisition test system are presented in this paper. The design method of the system software,main functions and characteristics are discussed.

Abstract:The operation principle and key design points of every part of the circuit of photo-electric smoke-sensing fire detector are presented in detail. This circuit has the characteristic of usingmicroampere current to drive the milliampere device. And it has the anti-jamming circuit,so that thereliability of fire alarm is increased. Thus this paper has great value in theory and practice.

Abstract:This article describes a practical method to realise mult-task real-time operation whichcan be used in embedded system. Two application cases are presented.

Abstract:(上接1999年第19卷第3期第37页) 2 计量人员的考核 计量人员的管理能力、技术水平和业务实绩须进行有效考核,依据短期、定期考核计划循序开展,并与奖惩措施相联系.

Abstract:This paper presentes the constructure improvements of three types of coordinatemeasuring machines and its new performance.