Timing bridge aperture question
I'm in the process of building a sensor bridge for an I-Lap decoder/transponder system, and I'm curious if anyone has done any testing or has any knowledge about how deep/wide the bridge channel should be.
I'm not an engineer (ha!), so I don't have the terminology to describe the distances, ratios and angles, but I think this drawing describes the question. The sensors themselves are 1" wide, so that is the minimum interior width. I'm hoping to pick up some off-the-shelf U-channel of some sort, and just wondering about what size will work. TIA! http://www.grymttr.com/greg/bridge.png |
I-lap is usually very good at providing information. Shoot them an email, and see what they recommend.
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This is the design I made long ago.
In the end, I ended up lowering the bridge height and using only 2 pick up sensors. |
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Correct. Too low and you run the risk of greater inaccuracy due to limited pickup zone/time and it does become more of a visual distraction as well. Especially if you have opaque legs. Despite mine being a 2” U channel, painted black and almost visually imperceptible legs, it’s no issue at all. I’ve built 3 with this template.
I would recommend staying between 12-16”. We actually mapped the functional pickup zone with much practical testing to get a happy medium. Sadly I do not have the physical mapping data anymore. I should have digitized it on the blueprint but didn’t. I didn’t want to go any larger than a 2” channel as it becomes disruptive visually. At 2”, you also have space to fine tune the pickup by fabricating cones or aperatures for each sensor without it being seen. It leaves you some practical working room in other words. Just make sure you use Velcro to attach the sensors so you can easily tweak placement. |
If you find a source for plastic U channel, please let me know. I had to order aluminum channel online as it wasn't available at typical hardware stores either.
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