Improving time measurement precision in embedded systems with a hybrid measuring method

2011 ◽  
Author(s):  
Horia-Nicolai Teodorescu ◽  
Mircea Hulea
Keyword(s):  
Embedded Systems ◽  
Measuring Method ◽  
Time Measurement ◽  
Measurement Precision

Study on Comprehensive Performance Testing Table and Intelligent Measuring Technology of Constant Velocity Universal Joint Assembly

2012 ◽  
Vol 591-593 ◽  
pp. 1539-1542
Author(s):  
Lun Shi ◽  
Xu Qi Qin ◽  
Xiao Jun Liu
Keyword(s):  
Constant Velocity ◽  
Performance Testing ◽  
Fuzzy Reasoning ◽  
Measuring Method ◽  
Measurement Precision ◽  
Universal Joint ◽  
Fuzzy Method ◽  
Comprehensive Performance ◽  
And Control ◽  
Joint Assembly

A comprehensive performance testing table, on which 9 testing items can be done, of the constant velocity joint drive shaft assembly is developed. The principle of the system is introduced and the mechanical structure and the computer measuring and control system of it are discussed particularly. Some intelligent measuring methods, such as fuzzy method, are used in the system and an example of testing the slip curve characteristic of the joint assembly by fuzzy measuring method is presented in detail, including its membership function and fuzzy rules of fuzzy reasoning. The slip curve measured by traditional method compared with that by fuzzy method. The experimental results show that the measurement precision by fuzzy method is more accurate than that by the traditional one.

An Ultrasonic Travel Time Measuring Method for Relative Blood Volume Monitor

2012 ◽  
Vol 588-589 ◽  
pp. 1136-1139
Author(s):  
Shun Zhong Jiang ◽  
Jiang Hong Fan ◽  
Wu Bing Xia
Keyword(s):  
Travel Time ◽  
Blood Volume ◽  
High Precision ◽  
Basic Principle ◽  
Measuring Method ◽  
Time Measurement ◽  
Single Chip ◽  
Measuring Methods ◽  
Measurement Principle ◽  
Relative Blood Volume

This study introduces the basic principle of relative blood volume monitor (BVM) by comparing several ultrasonic travel time measuring methods, brings forth the high-precision ultrasonic travel time measuring method based on TDC-GP2 time measurement chip and MSP430 Single-chip Microcontroller (SCM), presents the configuration of hardware and software in the system, and illustrates the structure and time measurement principle of TDC-GP2 time measurement chip.

A Method to Improve the Measurement Precision of the Traffic Radar

2013 ◽  
Vol 380-384 ◽  
pp. 963-966
Author(s):  
Xin Jie Wu
Keyword(s):  
Measuring Method ◽  
Measurement Precision ◽  
Frequency Resolution ◽  
Multiple Targets ◽  
Time Frequency ◽  
Speed Error ◽  
Traffic Speed

When multiple targets run through radar at the same time, the current traffic speed radars have more speed error. This paper presents an improved measuring method, provides a solution to improve time-frequency resolution. We can improve the speed resolution when adopting the algorithm proposed in the paper.

Development of CMM Auxiliary Equipment for Tiny Hole Measuring

2013 ◽  
Vol 797 ◽  
pp. 543-548
Author(s):  
Feng Chen ◽  
Zhi Gang Bing ◽  
Shang Hui Li ◽  
Li Cheng ◽  
Zhi Quan Zhang ◽  
...  
Keyword(s):  
Measuring Equipment ◽  
Influence Factors ◽  
Coordinate Measuring Machine ◽  
Measuring Method ◽  
Measurement Range ◽  
Measurement Precision ◽  
Test Method ◽  
Auxiliary Equipment ◽  
Precision Error ◽  
Measuring Machine

According to the limited measurement range of specific coordinate measuring machine (CMM), a reverse test method was put forward, and an auxiliary measuring equipment for tiny hole was developed. A measuring method for tiny hole was formulated, which using gauge head trigger signal of CMM as the test signal. The principle which was the tiny hole moving but not moving gauge head was used and the corresponding measurement software was designed so that the small measurement range was expanded. The measurement precision influence factors were analyzed and the measurement scheme was optimized. The results indicate that: then the measurement range of tiny hole is expanded to 1.0mm based on the combination of auxiliary equipment and CMM. The precision error is 0.004 mm which meets the measurement requirements.

Using the Rating Scale Model to Examine the Psychometric Properties of the Self-Efficacy Scale for Driver Competence

2011 ◽  
Vol 27 (3) ◽  
pp. 164-170 ◽  
Author(s):  
Anna Sundström
Keyword(s):  
Psychometric Properties ◽  
Self Efficacy ◽  
Rating Scale ◽  
Measurement Precision ◽  
The Self ◽  
Test Theory ◽  
Self Report ◽  
Scale Model ◽  
Validity And Reliability ◽  
Two Samples

This study evaluated the psychometric properties of a self-report scale for assessing perceived driver competence, labeled the Self-Efficacy Scale for Driver Competence (SSDC), using item response theory analyses. Two samples of Swedish driving-license examinees (n = 795; n = 714) completed two versions of the SSDC that were parallel in content. Prior work, using classical test theory analyses, has provided support for the validity and reliability of scores from the SSDC. This study investigated the measurement precision, item hierarchy, and differential functioning for males and females of the items in the SSDC as well as how the rating scale functions. The results confirmed the previous findings; that the SSDC demonstrates sound psychometric properties. In addition, the findings showed that measurement precision could be increased by adding items that tap higher self-efficacy levels. Moreover, the rating scale can be improved by reducing the number of categories or by providing each category with a label.

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