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Can Someone Tell Me Why...


Chowyunfatt
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I have recently bought a new car & installed Solar Film...During the installation, there was no cut out for the IU which made me slightly concern due to detection problems...

 

The installers assured me that detection of the IU was not a problem & so I believed them since they are reputable...Sure enough the ERP gantry was not a problem, but some car parks were unable to detect the IU...

 

For those Car Parks unable to detect, it is always during the exit, never the entrance...Why is this so?...Does anyone encounter this same problem?...

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Lights passing through the glass & reflection cause by the film, that's the problem.

 

Certain car parks (like T Payoh Central) install spot lights (white light like those HID light) to shine onto the windscreen so as the reader able to read your IU. Those readers install under shade take a longer time to read your IU while those under open air read faster.

 

 

 

[bounce2][bounce2][bounce2]

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Is your solar flim ceramic based or metallic based?

 

I believe it's more important for metallic based flim to have a cut out for the IU.

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But funny rite...come into the Car Park no problems...But when going out then kena...are they using different sensors for the entrance & exit?... [hur]

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When u go into the car park, even without cash card, the barrier will still open. It detects on your IU. But going out, they need to deduct the money, so cash card must be inserted into the IU.

Edited by Tonyg
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that depends on where they place the sensor as well....one placed 45degree to the iu vs one placed 180degrees to the iu may go thru different degree of rarefaction.

 

remember this is is system whereby the ray sent to the iu is meant to read and the return ray to confirm and deduct. if there is certain degree of rarefaction, the responding ray may not be sent out

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These ppl damn funny...don't they have a guide line to install these sensors if they realise that certain angles cannot detect consistantly?... [hur]

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If you want to get a detail answer, pls display more details in your question such as name and type of solar film and which particular carparks.

 

It's like I'm telling you I see a doctor for a problem but problem not solved. So how? [:/]

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usually the reason is because the engineer tested it with 1 particular car with a particular solar firm and cutting..

 

probably lazy or oversight that he didn't tested enough different samples.

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Lights passing through the glass & reflection cause by the film, that's the problem.

 

Certain car parks (like T Payoh Central) install spot lights (white light like those HID light) to shine onto the windscreen so as the reader able to read your IU. Those readers install under shade take a longer time to read your IU while those under open air read faster.

 

 

 

[bounce2][bounce2][bounce2]

 

I don't really understand this.

 

When you use the word, "read", does the sensor really need lights to read the IU?

 

if you ask me, those lights are there more for drivers that need to print receipt or for them to see that there's a barrier and not ram thru it. but to read the IU? that's new to me [:p]

 

 

Edit: if your theory is used on those old style of sensor such as those used in NUS that read number plate, then maybe it need lights..

Edited by Sony
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