Non Contact speed measurement

[kellian]

looking into options to do non contact speed measurement
Measuring speed of rail carriages.
Maximum expected speed to be measured is 1 km/hour.
Inputting into a Siemens PLC. 4-20 ma preferred, can use 0-10 v or profibus
Will need to be able to mounted at least 1 meter from the carriage.
Environmental factors include coal dust and water

One I have found that looks promising is http://www.polytec.com/us/products/...rs/lsv-6000-series-laser-surface-velocimeter/

Does anyone have any feedback on this device or others that I could look into.

 

[JordanCClark]

Here's a company I've used in the past. I don't think they come with analog out of the box, though. We've always used the quadrature outputs.

http://www.betalasermike.com/index.php/en/

 

[Oleksandr_Husyev]

We use KELK Accuspeed ASD2100A to measure speed of plates after mill. It works fine but sometimes he doesn't like start/stop mode

Analog velocity output is built in. Also you can choose option with one of industrial interface, such as Profibus, Modbus etc.

http://www.kelk.com/velocity.html

http://www.luchsinger.it/public/luchsinger/productlines/pdf/ds_aspd_885_10pdf.pdf

 

[shooter]

1km/h is very slow so better is position measurement and then calculate the speed.