We are ready to first real test of the air pressure measurement in the vinyl inflatable toy. The first question is, how big is the air pressure in the toy when it is loaded by human body. Next, we are curious, if the pressure is bigger in larger or in smaller air chamber, when the load is the same. Also, we would like to know how big is this difference.
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| The toy inflation |
So next, we inflated a nice INTEX black whale toy and connected it's air valves to our new pressure sensor. The sensor was connected using old air mattress pump nozzle and aquarium 4 x 1 mm hose approximately 2 m long. We believe, that this will not make any significant distortion of pressure changes.
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| The pressure sensor connection |
The pressure was measured in both air chambers, in the large body and in the smaller tail. At beginning, the air pressure was near the same which was given by the air pump used. Next. both chambers were loaded by human body weight and then released several times. All air pressure changes were recorded.
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| The air pressure in the body recorded |
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| The air pressure in the tail recorded |
One can see that the air pressure in the tail can achieve bigger levels, approximately 6.5 kPa peak in our experiment. In comparison, the body achieves only near 3.5 kPa. Also, note the negative peak when the chamber was released, more visible at big body air chamber. Time mark in both charts was set to 20 ms.
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