Results 261 to 270 of about 945,461 (308)

Digital measuring techniques and evaluation processes

15th IET International School on High Voltage Engineering and Testing 2008, 2008
After the description of the main characteristics of digital measuring systems in comparison to analogue measuring systems the most difficult type of voltages to be measured in high voltage tests, the lightning and switching impulse voltage, will be used to show the important parameters of digital measuring systems and its consequence concerning ...
openaire   +1 more source

A digital coincidence measurement system using FPGA techniques

Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2011
Abstract A field programmable gate array (FPGA) based digital coincidence system has been developed to use with NaI scintillators for field applications. The analog output signal from the photomultiplier anode is directly transferred into digital signals by pulse height for pulse width conversion.
Feng-ming Zhu, S.C. Hsieh, W.W. Yen, H.P. Chou   +3 more
openaire   +1 more source

Digital technique for high accuracy focal length measurements

Optics Communications, 1998
Abstract Digital speckle pattern interferometry (DSPI) is applied to obtain the focal length of both positive and negative lenses, and of a system of lenses. Reference correlation fringes are generated by rotating a plane wavefront in a Mach–Zehnder like DSPI interferometer.
Ricardo A Arizaga, Juan A Pomarico, Roberto D Torroba   +2 more
openaire   +1 more source

Frequency stability measuring technique using digital signal processing

Electronics and Communications in Japan (Part I: Communications), 2003
AbstractTo measure the frequency stability of an atomic oscillator having high‐frequency stability, a technique using a pair of mixers and a time interval counter is widely used. This technique shares the signals of a local oscillator, uses a pair of mixers to convert the signals of the reference oscillator and the signals of the test oscillator to ...
Masaharu Uchino, Ken Mochizuki
openaire   +1 more source

A digital coincidence measurement system using FPGA techniques

2009 IEEE Nuclear Science Symposium Conference Record (NSS/MIC), 2009
A digital coincidence system for nuclear radiation measurement has been developed. The analog output signal from detector is transferred into digital signals by pulse height to pulse width converter. The digital signal contains the energy and timing information of the radiation events.
S.C. Hsieh, H.P. Chou
openaire   +1 more source

Measurement Techniques for Digital Television

2001
The measurement of characteristic parameters in digital television can be divided into two areas. First of all, the source signals in the baseband are processed to form compressed data streams. These are subsequently furnished with an error protection and then digitally modulated for transmission.
openaire   +1 more source

Digital techniques improve range measurement with ultrasound sensor

Sensors and Actuators A: Physical, 1992
Abstract This paper presents a report on digital and computer techniques for modelling and signal reconstruction applied to an experimental ultrasound range sensor, which acquires much more accuracy and reliability than conventional systems working with a detection threshold method, even when this is a dynamic one.
S. Ros, J.M.Martín Abreu, T. Freire, L. Calderon   +3 more
openaire   +1 more source

A Digital Interpolation Technique in Time Measurement

IEEE Transactions on Instrumentation and Measurement, 1964
The problem of measuring a time interval using a crystal oscillator as a time base is discussed. A statistical analysis is made of the free-running oscillator and gated counter when the time interval to be measured is repetitive. Using the equivalent circuit of a quartz crystal, the difficulties involved in using a pulsed crystal oscillator as a time ...
openaire   +1 more source

On Improved Digital Techniques of Pulse Width Measurement

IETE Journal of Research, 1973
A digital technique for the instantaneous measurement of pulse width is described in this paper. The techniques make use of a 50 per cent amplitude sampling circuit which converts the varying amplitude pulses into the fixed amplitude pulses require to work with the pulse stretcher and a special stretcher circuit which generates a pulse 100 times as ...
A. N. Murthy, J. P. Gupta, K. Mohan Reddy   +2 more
openaire   +1 more source

Digital measuring technique and evaluation procedures

2001
The introduction of digital recording system in the high-voltage measuring technique has a great influence on the measuring technique and the evaluation procedures. The formerly used analogue recording instruments were developed for high-voltage measurements and in particular for impulse measurements under very noisy conditions or in other words for ...
openaire   +1 more source