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Technical Note (National Research Council of Canada. Division of Building Research), 1966-07-01
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Further Measurements of the Vibrations of an Industrial Camera
Jones, L. A.
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https://nrc-publications.canada.ca/eng/view/object/?id=b264663a-ff60-43ed-8005-29e52250e352 https://publications-cnrc.canada.ca/fra/voir/objet/?id=b264663a-ff60-43ed-8005-29e52250e352
DIVISION OF BUILDING RESEARCH
NATIONAL RESEARCH COUNCIL OF CANADA
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No.
473PREPARED BY L. A. Jones CHECKED -BY T. D. N. APPROVED BY N. B. H.
PREPARED FOR
SUBJECT
July 1966
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
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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.
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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.
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VERTICAL LONGITUDINAL (E - W) TRANSVERSE (N -S)Velocity Velocity Velocity
Vibration Measuring Amplitude* Frequency, Amplitude* Frequency, Amplitude* Frequency,
Source Position in/sec. cycles/sec. in/sec. cycles/sec. in/sec. cycles/sec.
x 10-3 x 10- 3 x 10-3
Vac.u-um Pump s #1 0.60 120
+
Noise.
O. 12 120+
NoiseGeneral Background #1 0.. 30 150 O. 18 60
+
Noise"
#2 0.40 60+
300 O. 12 Noise ,"
#3 0.40 60+
300 0.24 . '200 11' 0, _ • " . ｾＮ-"
On the N. Wall O. 72 .200 ON THE CAMERAPresses, in Lens Board
Adjacent Rooms (Camera face)** 3.50 15
-"
Copy Board .'.
(Glass frame)** 3.00 15
Vacuum Pump s Lens Board 1. 80 10
"
Copy Board 1.55 10Gene-ral
11!.:!.<T..:kgr ound Lens Board 0.48 15
"
Copy Board 0.40 15"
Camera Back 3.50 14+
120"
Camera Bed 0.60 30+
300 ｾ-,
.
Vacuum Pumps Camera Back 4.50 14
+
120.
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TABLE I - VIBRATION .MEASUREMENTS
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