Methods of and apparatus for detecting minute holes in objects专利检索-光电倍增管传感器与探测器专利检索查询-专利查询网

Methods of and apparatus for detecting minute holes in objects

阅读：967发布：2023-05-10

专利汇可以提供Methods of and apparatus for detecting minute holes in objects专利检索，专利查询，专利分析的服务。并且Methods of and apparatus for detecting minute holes in objects by using photoelectric cell means, such as a photomultiplier. Each object to be tested is placed or moved between a light source and the photoelectric cell means and suitably sealed from extraneous light so that the only light that can activate the photoelectric cell means comes through one or more holes or cracks in the object. The method is practiced by flexing the article during the inspection thereof by any one of a number of means in order to be certain that any hole is not inadvertently closed by virtue of its disposition and/or size in the object being tested. A flexible light seal means is disclosed which permits ease of inspecting discrete articles. In order to increase the sensitivity of the photoelectric cell means, there is disclosed means for lowering the thermal noise thereof whereby it may be operated at higher per stage voltages without becoming unstable.，下面是Methods of and apparatus for detecting minute holes in objects专利的具体信息内容。

权利要求

1. A method of detecting minute holes in objects comprising the steps of a. placing an object between a source of light and a photoelectric cell means, b. establishing a light seal with the boundary of the object whereby the only light that can activate the photoelectric cell means comes from said source of light through one or more holes in said object, c. producing a periodic flexure of said object in the form of transient realignment of material surrounding a hole in said object, d. and directing light from said light source toward said object while said object is being flexed thereby activating said photoelectric cell means whenever a hole exists in said object.

2. A method of detecting minute holes in objects as defined in claim 1 wherein said step of producing a flexure of said object is accomplished by establishing a pressure differential on opposite sides of said object.

3. A method of detecting minute holes in objects as defined in claim 1 wherein said step of producing a flexure of said object is accomplished by establishing a standing wave on said object.

4. A method of detecting minute holes in objects as defined in claim 1 wherein said flexure is established electrically.

5. A method of detecting minute holes in objects as defined in claim 1 wherein said flexure is established magnetically.

6. A method of detecting minute holes in objects as defined in claim 1 wherein said flexure is established mechanically.

7. A method of detecting minute holes in objects as defined in claim 1 whereby said flexure is established acoustically.

8. A method of detecting minute holes in objects as defined in claim 1 including the additional step of enhancing the light path between said object and said photoelectric cell means by stimulating emission from phosphors positioned therebetween.

9. A method of detecting minute holes in objects as defined in claim 8, wherein said phosphors are located on reflector means which facilitate redirection of light which passes through said object toward said photoelectric cell means.

10. A method of detecting minute holes in objects as defined in claim 1 including the additional step of cooling said photoelectric cell means with compressed air taken from a readily available central plant source in order to lower the thermal noise of said photoelectric cell means.

11. A method of lowering the thermal noise of a photoelectric cell means comprising the steps of a. placing said photoelectric cell means in a thermally insulated recess, b. cooling the air surrounding said photoelectric cell means within said recess, c. and suppressing a corona discharge from electrodes within said photoelectric cell means.

12. A method of lowering the thermal noise of a photoelectric cell means as defined in claim 11 including the additional step of surrounding said photoelectric cell means with a metallic screen and maintaining said metallic screen at the cathode potential of said photoelectric cell means.

13. A method of lowering the thermal noise of a photoelectric cell means as defined in claim 12 wherein said metallic screen is copper and said screen is coated with rhodium.

14. An apparatus for detecting minute holes in objects which comprises a. support means for supporting an object to be tested, b. said support means being provided with an aperture adapted to be covered by an object to be tested, c. light seal means for engaging an object to be tested to establish a light seal therewith, d. photoelectric cell means positioned in proximity to said aperture to scan an object to be tested when said object is positioned over said aperture, e. means to withdraw said light seal means away from said aperture in order to position an object to be tested over said aperture, f. and wherein said support means is provided with a groove concentric with said aperture to permit internal expansion of said light seal means for reception of an object to be tested.

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Methods of and apparatus for detecting minute holes in objects

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