Photogrammetry for Displacement MeasurementObjective: To use the photogrammetry technique to measure structural deflections. Photogrammetry technique relies on image processing to measure real-life deflections. Apparatus used: Beam, Blocks, Weight, Marker
Step 1: a). Click on add button to add left block in the lab. Step 1: b). Click on add button to add right block in the lab. Step 1: c). Click on add button to add alluminium beam in the lab. Step 1: d). Click on add button to add plate of beam in the lab. Step 1: d). Click on add button to get marker to mark A, B, C points. Step 1: e). Click on camera icon to capture screenshot. Step 1: f). Click on eye icon to see the table top view for measurement.
A
B
C
100 mm
861 px
1530 px
+
+
+
Step 2: a). Click on calculate button. Step 2: b). Click on next button.
No Weight
Assuming, 861 pixels is equivalent to 100mm
Y1 = (100/861) x 1530;
Y1 = 177.70 mm
Step 3: a). Click on add button to add weight in the lab. Step 3: b). Click on weight to arrange it on the weight plate. Step 3: c). Click on camera icon to capture screenshot. Step 3: d). Click on eye icon to see the table top view for measurement.
A
B
C
100 mm
861 px
+
+
+
1544 px
Step 4: a). Click on calculate button. Step 4: b). Click on next button.
P = 0.43N
Assuming, 861 pixels is equivalent to 100mm
Y2 = (100/861) x 1544;
Y2 = 179.326 mm
Deflection, ∆Y = Y2 - Y1
∆Y = 1.626 mm
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