Communications: electrical – Land vehicle alarms or indicators – Internal alarm or indicator responsive to a condition of the...
Patent
1984-11-13
1987-09-22
Brigance, Gerald L.
Communications: electrical
Land vehicle alarms or indicators
Internal alarm or indicator responsive to a condition of the...
340706, 340709, 340720, 324121R, G09G 100
Patent
active
046958339
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a measuring apparatus which measures observation waveforms of an object to be measured using an oscilloscope device.
The object includes a field of non-destructive inspection utilizing ultrasonic waves. An ultrasonic transducer emits ultrasonic waves into a material to be inspected, and waves reflected by the material are introduced as observation waveforms via the transducer and are displayed on the cathode-ray tube. The observation waveforms change extensively depending upon the material to be inspected, the shape thereof, and the items of inspection.
In measuring the objects inclusive of non-destructive inspection of a material by the ultrasonic waves, how to observe the observation waveforms casts an important theme. Observation of the waveforms can be divided into an observation method of observing the waveforms by eye, and an automatic observation method of automatically monitoring the waveforms.
BACKGROUND OF THE ART
The oscilloscope device introduces a variety of observation signals from an external object that is to be measured, and displays the observation waveforms representing the observation signals on the picture plane of a cathode-ray tube CRT. When it is desired to measure a particular position in the observation waveforms by using the oscilloscope device, the operator observes it using his eyes.
However, measurement based upon the use of ones eyes involves errors, and requires a period of time that cannot be neglected. In particular, when complex waveforms are displayed on the cathode-ray tube, measuring error increases and measuring time increases, too.
There has been proposed a method of obtaining the measurement completely automatically to substitute for the measurement by the operator based upon the oscilloscope device. Namely, this method makes use of an automatic measuring device which consists of an A/D converter and a microcomputer, arranged in parallel with the oscilloscope device. The A/D converter samples the observation signals and subjects them to the A/D conversion. The microcomputer introduces digital outputs from the A/D converter, selects necessary values of observation, and collects the selected values of observation.
The above method is effective when the observation signals have regularity or when the observation signals of a low speed are to be treated. However, it becomes difficult to perform the automatic measurement when the observation signals of high speeds are to be treated or when the observation signals undergo the change in a very complex manner.
Another method consists of introducing A/D outputs of observation signals in real time, and then selecting the measured values in off-line. However, when complex observation signals are to be treated, it becomes necessary to provide a memory for filing the data that are introduced in real time, i.e., to provide a memory having a large capacity. If it is attempted to introduce and to treat the data in real time, then the computer must bear a large burden.
On the other hand, the data required for the subsequent arithmetic operation do not represent all of the input signals even when the input signals are automatically introduced or even when an operator visually reads the data on the oscilloscope. They form numerical points on the input signals. To find the data (effective data) of numerical points required for the arithmetic operation, makes a problem of software for the operator or for the computer. In the case of the computer, the software technique makes it possible to sufficiently cope with the problem when the content of data after A/D converted is as simple as to distinguish whether the level of input signals is greater than a reference value or not, or when the presence of signals having a level greater than a given level is to be confirmed, or when the input time of the signals is to be calculated, even when the input signals have a level that does not change or that changes vigorously. Often, however, the input signals may change vigorously, or the po
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Nasu Seiji
Ogura Yukio
Brier Jeffery A.
Brigance Gerald L.
Hitachi Construction Machinery Co.
Hitachi Engineering Co. Ltd.
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