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New algorithm in transit-time ultrasonic flow meter has been developed for high-speed and precise requirements in semiconductor industries. Differential correlation method is used for transit-time difference calculation, and linear interpolation is applied to enhance the accuracy and precision. Single transit-times are also detected for sound speed correction. This algorithm which was proved with...
In this work it is shown how simple modifications can be made to an arbitrary waveform generator to achieve orders of magnitude in memory compression for nonlinear modulation schemes.
The paper proposes a calibration technique for the evaluation of the phase necessary for the operation of a 3-D scanner based on sinusoidal fringe projections. The calibration requires the acquisition of images of a target plane positioned at only two parallel poses and evaluates the phase values at intermediate positions through linear interpolation. The calibration procedure is described in detail...
Due to its restricted usage and accuracy in measuring extremely short interval of time, TDC (time to digital converter) embedded measurement devices are relatively expansive. Even if new applications are being developed in daily life as well as in industry, the cost condition of TDC based measurement systems needs to be improved. To reduce the deployment cost on a commercial scale, analogue interpolation...
This paper presents the use of a multiplying delay locked loop (MDLL) for delay line-based time interval measurement. The structure is introduced together with the theory behind the performance. Measurement results obtained with a MDLL-based time digitizer designed with 0.35 mum CMOS verify the operation and calculated performance of the device. This MDLL technique with modern CMOS technology makes...
This paper focuses on the amplitude estimation of a sine-wave harmonic component by the Interpolated Discrete Fourier Transform (IpDFT) method with maximum sidelobe decay windows. A constraint is derived ensuring that the influence of systematic errors due to the contribution from fundamental component on the amplitude estimation of a harmonic component can practically be neglected. This constraint...
In this paper, the exponentially damped sinusoidal signals are analyzed. The peaks of the discrete Fourier transform (DFT) results are adopted to obtain the parameters. Simple algorithms for fast measurement and estimation of an unknown damping beside frequency are presented. The idea of the quotient interpolation for the two-point frequency estimation can be adopted also for the damping. The Hann...
For the signal containing the inter-harmonics, if the sample number is not equal to integer times of the signal period, the spectral leakages will occur in harmonic analysis based on DFT and affect the measurement accuracy. To improve the accuracy, different from other correction methods in which the long-range leakages are reduced by windowing the signal, a new interpolation algorithm is presented...
A time-to-digital converter (TDC) based on a free running ring oscillator and timing signal interpolators has been fabricated in a 0.13 mum CMOS process for the receiver of a pulsed time-of-flight laser rangefinder (TOF). The time-to-digital conversion is based on counting the pulses of this eighth-stage, differential ring oscillator and additionally registering the state of its 16 phases at the arrival...
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