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Peter Lucas, Maria Mirzaei, Harm Tido Petter, Maurice Heemskerk
PRIMARY STANDARD FOR NANOFLOW RATES

In this paper is discussed a novel primary standard which is based on volumetric expansion due to a temporal temperature gradient. The principle, required corrections, traceability and preliminary results are discussed.

Elsa Batista, Luís Ribeiro, Nelson Almeida, Eduarda Filipe, João Gala, Rui F. Martins
DEVELOPMENT OF A MICROFLOW PRIMARY STANDARD

The Volume Laboratory (LVO) of the Portuguese Institute for Quality (IPQ), in cooperation with the Department of Mechanical and Industrial Engineering (DEMI) of the Faculty of Science and Technology of The New University of Lisbon (FCT/UNL), developed a gravimetric microflow standard with a range between 10 mL/min and 100 nL/min. The design of the microflow standard was based on three main elements: a flow generator (syringe pump), a collector device and a data acquisition computer program. The microflow standard was tested and validated by means of an ongoing intercomparison, at different flow rates, with uncertainties in the range of 0,1 % up to 0,5 %.

Aline Piccato, P. G. Spazzini, R. Malvano
TRACEABILITY IN ANEMOMETRY IN A ROTATING ARM AS AIRSPEED PRIMARY STANDARD

LDA measurements of airspeed induced by the arm rotation at the measurement position and a definition of actual capabilities of this facility as primary standard according to the WGFF position are described in this paper.

Iosif I. Shinder, Christopher J. Crowley, B. James Filla, Michael R. Moldover
IMPROVEMENTS TO NIST’S AIR SPEED CALIBRATION SERVICE

We discuss five significant improvements to the Air Speed Calibration Service conducted by the National Institute of Standards and Technology (NIST):
1. Reduced-uncertainty calibration of the secondary standard [Laser Doppler Anemometer, (LDA)] using a spinning disk,
2. Reduced-uncertainty LDA measurements that account for the position-dependence of the air speed in the test section and for window effects,
3. Improved repeatability, precision, and ease of calibrations by using automated data acquisition and PID air speed control,
4. Optical Character Recognition data acquisition system for anemometers lacking electrical outputs,
5. Up-to-date uncertainty budget of the LDA.
Also, we present the results (with uncertainties) of Pitot tube calibrations.

Tatsuya Funaki, Aya Iwai, Masahiro Ishibashi
DEVELOPMENT OF NEW HIGH AIR SPEED STANDARD IN JAPAN

NMIJ is developing a new standard system for high air speed over 90 m/s.

Mathias Rohm
THE BEV/E+E ELEKTRONIK AIR SPEED REFERENCE

The paper presents a detailed description of the calibration equipment and procedure of the new Austrian reference laboratory for air speed in the range from 0.04 m/s to 40 m/s.

Cui Lishui, Wang Chi, Li Chunhui
ESTABLISHMENT OF NEW AIR VELOCITY STANDARD IN NIM

New air velocity standard facility is established at NIM. The facility is constituted of wind tunnel with outlet diameter of 200mm and LDA that works as standard to calibrate anemometer. In the velocity range of（0.2 ～ 30）m/s, the velocity stability and the deviation of velocity distribution along profile are both less than 0.35%. To realize traceability of LDA the spinning-disc is developed. The wire with diameter of 5 μm is mounted on the edge of spinning disc to simulated tracing particle in air flow. The calibration results and analysis suggest that the expanded uncertainty of fringe spacing is evaluated to be: Urel < 0.3%, k = 2.

Mindaugas Rybokas, Lauryna Siaudinyte, Vytautas Giniotis
NEW APPROACH TO PRECISION ANGLE CALIBRATION MEANS AND METHODS

The paper deals with the methods and means of precision angle calibration with new development of methods for raster scales measuring and vertical angle measurement of geodetic instruments. The calibration of angle information measuring is discussed including rotary encoders, precision circular raster and coded scales. The new development of mechatronic test bench and the results of measurement are described.

Pu Zhang, Jing Chen, Yuandi Yang
DESIGN OF PULSE OXIMETER SIMULATOR CALIBRATION EQUIPMENT

Saturation of peripheral oxygen (SpO2) is one of the most important parameters of vital signs. Pulse oximeter which based on near-infrared spectroscopy is commonly used as a non-invasive method to measure SpO2. Currently, medical device manufacturers as well as metrology measurement agencies in China usually use pulse oximeter simulator as the commonly accepted functional calibration equipment for pulse oximeters. So far, there is no experimental protocol or devices can be used to test the accuracy and reliability of a pulse oximeter simulator, therefore, a set of new metrology apparatus with the name of pulse oximeter simulator calibration equipment have been designed in order to make a traceable system for the calibration or verification of pulse oximeter simulators. The principles and some research methods of this pulse oximeter simulator calibration equipment will be discussed in this paper. Besides that, many experiments have been applied in order to guarantee the accuracy as well as traceability of this set of equipment.

Elizete Gonçalves Lopes Rangel, Carlos Teixeira de Assumpção, Eduardo Alan de Andrade Cruz, Petrônio Noronha de Souza, Ricardo Sutério
POWER SENSOR: A MEASUREMENT COMPARISON

This paper presents the results of a comparative analysis of the calibration factor measurements of the power sensor model E4413A, manufactured by Agilent, which operates at frequencies from 50 MHZ to 26.5 GHz and power levels from -70 dBm to +20 dBm. The comparison takes into account the values of the calibration certificates provided by INPE’s Integration and Testing Laboratory (INPE/LIT) and two others calibration laboratories: National Physical Laboratory (NPL) of United Kingdom and Brazilian Calibration Laboratory of Agilent. The normalised error is used to evaluate the performed power measurements. Conclusive analysis of the results presented in this paper shows the compatibility and the reliability of the measurement values provided by INPE/LIT.

Page 502 of 977 Results 5011 - 5020 of 9762