Brief Description of Viewer which is used as a NDT Equipment in Industrial Radiographic Testing

1. ‫ویوور‬
Radiographic Film Viewer
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BY: M.KEHTARI
ASNT NDT Level III

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4. Viewer
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5. ASTM E 1742
5.4.4.1 The viewer shall contain a variable control to
allow the selection of optimum intensities for film with
varying densities.
5.4.4.2 The light source shall have sufficient intensity to
enable viewing of film densities in the area of interest
(see 6.27.4).
5.4.4.3 The light enclosure shall be designed to provide a
uniform brightness level over the entire viewing screen.
5.4.4.4 The viewer shall be equipped with a suitable fan,
blower, or other means to provide stable temperature at
the viewing port to avoid damaging the radiographic film
while viewing.
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6. ASTM E 1742
5.4.4.5 The viewer shall be equipped with a translucent
material front in each viewing port, except for localized
high-intensity viewing of high-density film areas through
separate viewing ports, apertures, or other suitable
openings.
5.4.4.6 A set of opaque masks, an iris-type aperture, or
any other method to reduce the viewing area to suit the
size of the area of interest shall be provided.
5.4.4.7 Illuminators procured to, or meeting the
requirements of, Guide E 1390 are acceptable for use.
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7. ASTM E 1390
6.1 General - The illuminator shall be manufactured
of materials deemed suitable to withstand the
environmental conditions encountered under normal
operating conditions.
6.2 Viewing Screen The viewing screen shall be easy
to clean and made of material which is resistant to
scratches. The size of the screen shall allow the user
to view the radiograph without excessive glare. If the
illuminator is to be used for viewing radiographs of
various sizes, masks of various sizes and
configurations shall be provided. Alternately, an
adjustable aperture may be used.
6.3 Color of Light - The color of the light used to
illuminate the radiograph shall be white, that is, color
temperature between 5000 and 6250°K. However,
illuminators using nonwhite or “colored” light may be
used if they have been recommended by the film
manufacturers.
6.4 Diffusing Screen - If the illuminator has a
diffusing screen, the light shall be sufficiently
divergent so that both eyes of the observer
receive rays from all parts of the screen.
6.5 Housing - The external housing shall be
constructed in such a manner that no
disturbing light hinders the viewing of the
radiographs.
6.6 Anti-Glare Device - The illuminator shall
be fitted with an anti-glare switch or device
that minimizes the probability of the operator
being subjected to excessive glare when the
radiograph is removed. This switch or device
may be manual or automatic.
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8. ‫سوال‬ ‫یک‬
‫خیر؟‬ ‫یا‬ ‫دارد‬ ‫کالیبره‬ ‫به‬ ‫نیاز‬ ‫ویوور‬ ‫آیا‬
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9. ‫فراوان‬ ‫امتنان‬ ‫و‬ ‫سپاس‬ ‫با‬
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