National standards and standard measurement systems for impedance and reflection coefficient

1986 ◽  
Vol 74 (1) ◽  
pp. 39-45 ◽  
Author(s):  
A.P. Jurkus ◽  
U. Stumper
Keyword(s):  
Reflection Coefficient ◽  
National Standards ◽  
Standard Measurement ◽  
Measurement Systems

A Close Look at the Measurement of Shock Data: Lessons Learned

1992 ◽  
Vol 35 (5) ◽  
pp. 39-45
Author(s):  
Bill Hollowell ◽  
Strether Smith ◽  
Jim Hansen
Keyword(s):  
Data Acquisition ◽  
Structural Dynamics ◽  
Lessons Learned ◽  
Standard Measurement ◽  
Measurement Systems ◽  
Data Acquisition Systems ◽  
Unpredictable Environment

Pyroshock testing and analysis is one of the most difficult regimens in the field of structural dynamics. The harsh and often-unpredictable environment has caused relatively poor behavior of the measurements systems used, often for reasons that were not well-understood. This paper reports on a study that was performed with the goal of better understanding the problem areas and development of methods for improving results. Specific areas addressed include: characterization of the broadband response and evaluation of its effects on standard measurement systems, transducer mounting and cabling techniques, measurement of inplane motion, and the problem of justifying/normalizing the results obtained by different data acquisition systems.

scholarly journals Gear Shape Measurement Potential of Laser Triangulation and Confocal-Chromatic Distance Sensors

Sensors ◽  
2021 ◽  
Vol 21 (3) ◽  
pp. 937
Author(s):  
Marc Pillarz ◽  
Axel von Freyberg ◽  
Dirk Stöbener ◽  
Andreas Fischer
Keyword(s):  
Measurement Uncertainty ◽  
Surface Properties ◽  
Optical Sensors ◽  
Laser Triangulation ◽  
Shape Measurement ◽  
Full Potential ◽  
Position Measurement ◽  
Standard Measurement ◽  
Measurement Systems ◽  
Measurement Approach

The demand for extensive gear shape measurements with single-digit µm uncertainty is growing. Tactile standard gear tests are precise but limited in speed. Recently, faster optical gear shape measurement systems have been examined. Optical gear shape measurements are challenging due to potential deviation sources such as the tilt angles between the surface normal and the sensor axis, the varying surface curvature, and the surface properties. Currently, the full potential of optical gear shape measurement systems is not known. Therefore, laser triangulation and confocal-chromatic gear shape measurements using a lateral scanning position measurement approach are studied. As a result of tooth flank standard measurements, random effects due to surface properties are identified to primarily dominate the achievable gear shape measurement uncertainty. The standard measurement uncertainty with the studied triangulation sensor amounts to >10 µm, which does not meet the requirements. The standard measurement uncertainty with the confocal-chromatic sensor is <6.5 µm. Furthermore, measurements on a spur gear show that multiple reflections do not influence the measurement uncertainty when measuring with the lateral scanning position measurement approach. Although commercial optical sensors are not designed for optical gear shape measurements, standard uncertainties of <10 µm are achievable for example with the applied confocal-chromatic sensor, which indicates the further potential for optical gear shape measurements.

Medicare Advisers Call for National Standards on Imaging

Ob Gyn News ◽  
2005 ◽  
Vol 40 (4) ◽  
pp. 43
Author(s):  
JENNIFER SILVERMAN
Keyword(s):  
National Standards

Food Safety Security: A new Concept for Enhancing Food Safety Measures

2012 ◽  
Vol 82 (3) ◽  
pp. 216-222 ◽  
Author(s):  
Venkatesh Iyengar ◽  
Ibrahim Elmadfa
Keyword(s):  
Food Safety ◽  
Hazard Analysis ◽  
Warning System ◽  
Shared Responsibility ◽  
Fine Tuning ◽  
Strategic Action ◽  
Surveillance Network ◽  
Measurement Systems ◽  
Critical Control Points ◽  
The Impact

The food safety security (FSS) concept is perceived as an early warning system for minimizing food safety (FS) breaches, and it functions in conjunction with existing FS measures. Essentially, the function of FS and FSS measures can be visualized in two parts: (i) the FS preventive measures as actions taken at the stem level, and (ii) the FSS interventions as actions taken at the root level, to enhance the impact of the implemented safety steps. In practice, along with FS, FSS also draws its support from (i) legislative directives and regulatory measures for enforcing verifiable, timely, and effective compliance; (ii) measurement systems in place for sustained quality assurance; and (iii) shared responsibility to ensure cohesion among all the stakeholders namely, policy makers, regulators, food producers, processors and distributors, and consumers. However, the functional framework of FSS differs from that of FS by way of: (i) retooling the vulnerable segments of the preventive features of existing FS measures; (ii) fine-tuning response systems to efficiently preempt the FS breaches; (iii) building a long-term nutrient and toxicant surveillance network based on validated measurement systems functioning in real time; (iv) focusing on crisp, clear, and correct communication that resonates among all the stakeholders; and (v) developing inter-disciplinary human resources to meet ever-increasing FS challenges. Important determinants of FSS include: (i) strengthening international dialogue for refining regulatory reforms and addressing emerging risks; (ii) developing innovative and strategic action points for intervention {in addition to Hazard Analysis and Critical Control Points (HACCP) procedures]; and (iii) introducing additional science-based tools such as metrology-based measurement systems.

Sign in / Sign up

Export Citation Format

Share Document