TABLE B-1-3.a. EFFECTIVE AREA SEEN BY THE IMP
Angle (@)
(degrees)
Eff. of detector
at midpoint of 6
Tan@
x2
(ft2)
x(ft)
Area of
each interval
(ft2)
Areax eff.
(ft2)
10
0.99
0.17633
4.28
57.6
57.6
57.0
0.0157
20
0.955
0.36397
8.84
245.8
188.2
179.7
0.0496
30
0.89
0.57735
14,02
618.4
372.6
331.6
0.0916
40
0.805
0.83910
20.39
1306.1
687.7
553.6
0.153
30
0.69
1.19180
28.96
2634.7
1328.6
916.7
0.253
60
0.54
1.7321
42.08
5565.0
2930.3
1582.4
0.437
3621.0
0.9999
Total
*
”
Int. Area x Eff.
Total
(Ratio)
TABLE B-1-3.b. THE EFFECT OF A 10' WIDE ROAD
Angle (8)
(degrees)
Eff. of detector
set mid-pt. of 6
Tané
10
0.99
0.17633
x(ft)
4.28
Width of
road=10'
(ft2)
Area of each
interval (ft)
28.8
28.8
Total
Area
(ft2)
Area x
Eff.
(ft2)
Int. Area x Eff.
Total
(Ratio)
57.6
57.0
0.016
20
0.955
0.36397
8.84
88.4
59.6
119.2
118.6
0.033
30
0.89
0.57735
14.02
140.2
51.8
103.6
92.2
0.023
40
0.805
0.83910
20.39
203.70
63.5
127.0
102.2
0.028
30
0.69
1.1918
28.96
289.30
85.6
171.2
118.1
0.033
60
0.54
1.7321
42.08
420.50
131.2
262.4
141.7
0.039
629.8
0.174
Total