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Further Measurements of the Vibrations of an Industrial Camera
Jones, L. A.
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http://dx.doi.org/10.4224/20353233
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NATIONAL RESEARCH COUNCIL OF CANADA
DIVISION
OF
BUILDING
'If E C JHI N II C AIL
PREPARED
L. A. Jones
BY
CHECKED -BY
No.
RESEARCH
473
NOTJE
T. D. N.
APPROVED
BY
N. B. H.
July 1966
PREPARED
SUBJECT
FOR
Inquiry and record purposes
FUR THER MEASUREMENTS OF THE VIBRATIONS
OF AN INDUSTRIAL CAMERA
In October 1963 vibration measurements were made
at the Northern Electric Company Limited, Research and
Development Laboratories on an industrial camera to
determine its ultimate resolution. The factors involved
were discussed and reported in DBR Technical Note No. 407.
Since that time the camera has been relocated and modified.
The purpose of the present measurements was to determine
any improvement in vibration levels and also to investigate
the proposed location for a new camera.
PROCEDURE
The apparatus used was the same as in the previous
instance, an M. B. velocity sensitive transducer, Type 120,
a dc amplifier and a galvanometer recorder.
Vibration measurements were made at three positions
on the floor, ｾ ｯ ｣ ｡ ｴ ･ as follows: Position 1 - 3 ft from the
north wall and 9 ft from the west wall; Position 2 - 3 ft from
the north wall and" 4 ft from the west wall; Position 3 .. 6 ft
from the north wall and 4 ft from the west wall. -- Measurements
wer e also made on the north wall, 4 ft above the floor and 9 ft from the west wall, and at representative points on the camera.
- 2
OBSERVATIONS
The results are summarized in Table 1. On comparing
the present measurements on the camera with those reported
previously, it can be seen that the vibration levels have been
reduced by factors of two to five. Comparisons made between
the vibration levels on the floor in the pr evious case and
those made recently show that the present location is quieter
by a factor of about ten. The floor is quieter than the wall
and it is to be expected that if a new camera were installed
on the floor, its performance would equal that of .the present
camera.
******
e
e
-
VERTICAL
Vibration
Source
Measuring
Position
Velocity
Amplitude*
in/sec.
x 10- 3
Frequency,
cycles/sec.
+
#1
0.60
120
General
Background
#1
0.. 30
150
#2
0.40
60
+
300
#3
0.40
60
+
300
,
Velocity
Amplitude*
in/sec.
x 10- 3
Noise
Frequency,
cycles/sec.
.
O. 18
+
60
TRANSVERSE (N -S)
Velocity
Amplitude*
in/sec.
x 10- 3
_
Frequency,
cycles/sec.
+
O. 12
120
O. 12
Noise
Noise
Noise
0.24
0,
11'
"
,--
LONGITUDINAL (E - W)
Vac.u-um Pump s
"
"
"
e
TABLE I - VIBRATION .MEASUREMENTS
. '200
•
.
On the N. Wall
O. 72
ｾ
-"
.200
ON THE CAMERA
Presses, in
Adjacent Rooms
3.50
15
Copy Board
(Glass frame)**
3.00
15
Lens Board
1. 80
10
Copy Board
1. 55
10
Lens Board
0.48
15
"
Copy Board
0.40
15
"
"
Camera Back
3.50
14
Camera Bed
0.60
30
Camera Back
4.50
"
Vacuum Pump s
"
Gene-ral
11!.:!.<T..:kgr ound
Vacuum Pumps
'*
**
Lens Board
(Camera face)**
-,
.'
.
Velocity amplitude:: zero-to-peak velocity.
Terms in parentheses were used in TN. 407.
14
+
+
+
120
300
120
ｾ
.
.