Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1984-10-31
1987-07-21
Groody, James J.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358125, 250203CT, H04N 718
Patent
active
046822216
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to a non-contact electro-optical displacement follower, which captures microscopic displacement of the part under test optically and measures it in a non-contact mode.
BACKGROUND TECHNIQUE
A non-Contact Electro-optical Displacement follower measures displacement by electrically processing a target image of the part under test which has been captured optically and converted into an electrical image. As this kind of equipment can measure displacement without actually coming into contact with the object being measured, one can measure high speed displacement, microscopic displacement, etc. from a set distance accurately, without having any effect upon the operation of the part which is displaced. The equipment can thus be used in various fields, such as research, experiment, manufacturing, test, etc., because of its ability to measure the displacement by merely capturing the displacement part optically without obstructing the operating state, no matter what the shape of the displaced part.
Concerning conventional non-contact electro-optical displacement followers, it was often necessary to move the target or the measuring equipment (camera) when for some reason the optical image of the part under test had to be moved beyond the range within which the above image was captured and that measurement or adjustment could be carried out. However, in general, neither could be easily moved without disrupting the experiment, as the part to be measured would easily fall out of sight. It is very time consuming to move a camera each time the displacement measurement the purpose of which is to measure microscopic movements is carried out. Moreover, it becomes difficult to obtain the measurement data maintaining the reliability and reproducibility and it is against the demand of quick and precise displacement measurement.
The most conventional equipment used an analog output to display the amount of displacement e.g. moving coil meter. With this system there was no way to display a warning to inform when the target's light/dark boundary was out of the measurable field even by a small amount. This was because the measurable field of the equipment was often small in proportion to the field which optically captures the light/dark target which is the device under test. In order to compensate for this defect, a system was adapted that connects the system in parallel, to an oscilloscope, and confirms the signal from the measuring equipment on a CRT. However, using this method, it is impossible to confirm whether the relative deflection between the target and the measuring equipment is beyond the fixed range or not. Also when using this kind of displacement follower, the measurement mode needs to be set up, according to the amount of light/dark of the target. If this is not set up correctly, measurement can not be carried out, because there will be an incorrect operating display.
In this case, the operator is forced to manually view the target, or change the mode setting by sighting again the target. In equipment used to measure the microscopic or short time displacement, conditions which require a lot of readjusting of the camera should be avoided, as well as those where individual operators ability will make a difference in the results.
When carrying out non-contact electro-optical displacement measurements, one must set up the target properly. Also displacement can not be measured accurately unless each operational step such as setting of camera and other measuring equipments, initial adjustment and the following modifications are carried out carefully, and meticulously. Accuracy naturally depends on how well the system has been initially set up, and subsequently, how carefully the modification operations are carried out. This was regarded as being complicated for beginners, since these operations required skill and intuition due to their complex construction and operating requirements. This was especially true when other measurement equipment or optional functions such as operation pr
REFERENCES:
patent: 3402298 (1968-09-01), Janeway
patent: 3495087 (1970-02-01), Starer
patent: 3571567 (1971-03-01), Eckermann
patent: 3593286 (1971-07-01), Altman
patent: 3651326 (1972-03-01), Alpers
patent: 3780223 (1973-12-01), Perry
patent: 3816648 (1974-06-01), Noll et al.
patent: 3923273 (1975-12-01), Alpers
patent: 3943277 (1976-03-01), Everly et al.
patent: 4297725 (1981-10-01), Shimizu et al.
Abe Keizo
Nakamichi Yuji
Okudera Tatsuya
Yamazaki Iwao
Groody James J.
Kostak Victor R.
Ya-man Ltd.
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