description was given about how to use the automatic image scanning technique and the pulse counting method to obtain the image boundary information in geometric measurement of video pictures.
Methods A self made cumulative illuminometer via pulse counting method was used for measuring cumulative illuminance of daylight to investige the photodegradation of Hydrocortisone injection in various lamp light and daylight;
The comparison of energy responses of pulse counting method and pulse height integration method using plastic scintillator are studied by Monte Carlo calculation.
2. In this paper, we have analyzed the impulse counting method in the digital-rebalance circuits and the three sampling methods including V/F、 A/D、 I/F in analog-rebalance circuit. The advantages and the disadvantages of these four sampling methods are compared and finally we have decided data sampling scheme.
Based on the position transducer two speed measurement methods: pulse numeration method and pulse period method are introduced in the paper, the precision of these two methods and the relationship of precision and rotative speed are also analyzed, based on the analysis a compounding method that is suitable for the whole speed range with higher precision is advanced, at last the filtering method of speed measurement data is discussed.
It is the method of pulse count that can be used to carry out the optical detection with CCD,and it is said that each pulse denotes a pixel, so the detective resolution only have one pixel.
When a CCD imaging sensor is applied to dimensional measure-ment,if output pulses from CCD are directly counted,the measuring resolu-tion will be poor.
we analyze and compare analog intervene method and time delay method according to their measuring precision and the measuring blind area to improve the measuring precision.
Accuracy of measuring time intervals by a pulse counting method
In the present paper, the common principle and the basic method of the technique of measuring thickness using a scanning laser beam are described. The elements which have an effect on the accuracy of the measurement are analyzed in principle, and therefore, the significance of the signal processing is dealt with. Especially, a scheme of the signal processing known as double frequency pulse-counting technique is presented, so that the measurement of the materials having irregular surface properties becomes feasible...
In the present paper, the common principle and the basic method of the technique of measuring thickness using a scanning laser beam are described. The elements which have an effect on the accuracy of the measurement are analyzed in principle, and therefore, the significance of the signal processing is dealt with. Especially, a scheme of the signal processing known as double frequency pulse-counting technique is presented, so that the measurement of the materials having irregular surface properties becomes feasible and the required accuracy in industrial metrology is reached. Finally, a prototype of measuring thickness instrument which has been used in the production of a rubber factory is reported with its experimental results.
The dimensional measurement using CCD imaging sensors isusually implemented by the method of photoelectrical pulse number counting,in which a photoelectrical pulse represents a span of photoelectrical cell inCCD imaging sensor. The span is approximately equal to the resolu tion errorof dimensional measurement. In many cases of highly precise measurement, this kind of resolution error limited the application of this technology. In or-der to surmount the difficulty, D. G. Purll has suggested that the pulse signalbe...
The dimensional measurement using CCD imaging sensors isusually implemented by the method of photoelectrical pulse number counting,in which a photoelectrical pulse represents a span of photoelectrical cell inCCD imaging sensor. The span is approximately equal to the resolu tion errorof dimensional measurement. In many cases of highly precise measurement, this kind of resolution error limited the application of this technology. In or-der to surmount the difficulty, D. G. Purll has suggested that the pulse signalbe demodulated to reform the continue photo signal by which the characteristicedge point of a measured object might be determined. This paper has theoreti-cally analysed the method of demodulation measurement. At first. it analys-ed the engineering realization of the ideal demodulation network and resultedin that (1) adjusting the lens parameter D/_2 could meet the band widthrequirement of photo signal; (2) in the specified condition, ideal demodulationnetwork could be replaced by an ideal low-pass filter; (3) the linear phasecharacter of this filter is very important to demodulate the pulse signal exac-tly; and (4) the definite length of CCD array merely affects the measure-ment range, whereas does not affect the demodulation precision. And then, itproved that the characteristic edge point is located at the point of the max-imum differential value of the continue photo signal. According to these analy-ses, the signal processing method has been, for the first, put forward. Arealizcd, experimental measurement system using this demodulation methoddemonstrated that this method could raise the resolution about ten times.Through the showed measurement result, it can be seen that because of the riseof resolution, systematic error appeared as an approximate straight line.This feature will be useful to compensate the systematic error by microproce-ssor. In this way, the demodulation measurement technique can reach theprecision level that in the total measurement range equal to the length of CCDarray, the measurement error can be under 2μm.
Some problems for determining directional dose equivalent H'(0.07)by current β radiation dosimeter are discussed in the paper.The principle,method and experimental results,of main performance for determin-ing H′(0.07)by an integral pulse-amplitude method with a plasticscintillation as a detector are introduced.The differences between the methodand that of pulse counting are discussed,and relevant suggestion arepresented.
脉冲计数法
pulse counting method
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