| 摘要 |
The present invention is an improvement for use in combination with an apparatus for determining stress and percent retained austenite in a specimen so the apparatus may be used to analyze both Nickel and Titanium alloyed materials. The apparatus includes a first X-ray source with either a copper or cobalt target which irradiates with an X-ray beam a surface area of the specimen impinging on the surface area at a particular angle and a second X-ray source with either a copper or cobalt target which irradiates with an X-ray beam the same surface area of the specimen simultaneously impinging at another particular angle. The apparatus also includes a first detector tube and a second detector tube, each of which has a combination filter of iron oxide and steel foil, for detecting diffracted X-rays in particular crystallographic planes. The apparatus further includes circuitry which is independently responsive to the output of the first and second detector tubes for providing outputs proportional to the intensities of the diffracted X-rays, positioning mechanism for positioning the first and second detector tubes in response to the difference of the outputs and angular detecting mechanism for detecting angular position of the first and second detector tubes. The improvement includes the alignment of the first and second detector tubes so that the diffracted X-rays travel the same distance thereto from the specimen in order to maintain a circle of focus.
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