SIMULTANEOUS ALL-AROUND MEASUREMENT OF A LIVING BODY
1529
Q —
=
lh
= oO
IN
I ime
LU.
G4
"
Fic. 2. Schematic diagram of the apparatus.
f/8 is satisfactory. The shutter speed depends
upon the sensitivity of the film and the
brightness of the subject. For a subject with
approximate skin color of 7.5 YR 6/4, the ap-
propriate conditions are f/8 at 1/15 sec with
ASA 3200 development.
The design of the vertical movement of a
grating with horizontal rulings introduces
some difficulties in construction. The main
reason for selecting this design against an-
ticipated difficulties was its free choice of
base length in the case of taking stereo pairs.
ALIGNMENT AND CALIBRATION
The “multiple light source” introduces
even and shadow-free illumination as well as
a higher illumination level, but requires
troublesome alignments. All the alignments
are made referring to water level, plumb line,
and visibility of the fringe. The flatness of a
grating is aligned with the aid of optical cut-
ting. Two vertical lines are stretched along
the both sides of grating with a small clear-
ance, 1 — 2 mm. The shadows of the threads
are overcast on the grating obliquely, with an
angle of approximately tan~! 5 and the screws
which support the bridges of the grating are
adjusted referring to the parallelism of the
vertical lines and their shadows.
All the light sources should be in a plane
parallel to the grating. This alignment is
also made using a plumb line. The camera
should be placed in such a position as to be
the same distance from the upper and lower
light sources and be in the same plane with
the light sources.
Then a large plane panel is placed ob-
liquely behind the grating, the fringe is ob-
UP DOWN
MOVEMENT >
e
100
LIGHT SOURCE
POWER SUPPLY 30
V4 (VOLT) o ——
ON =
CONTACT 1 OFF
OPEN |
SHUTTER 1 CLOSE l
100
LIGHT SOURCE
POWER SUPPLY 20
V,(VOLT) > EEE
ON
CONTACT 2 OFF
OPEN |
SHUTTER 2 CLOSE
— 0.25 fle
sec.
DOWN UP
MOVEMENT ——PÓ—— eS
Gy
Fic. 3. Time schedule of operation.
