FOI release

Speed Camera LTI 20.20 Ultralyte 1000

The request for information on was sent to CAST on 27 May 2011. “I therefore formally request that as the public interest test is now so strong…

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The request for information on was sent to CAST on 27 May 2011.

“I therefore formally request that as the public interest test is now so strong and the supplier confidentiality argument so weak that all documents held by CAST formerly (HOSDB)regarding this device are now released .
    
In particular I would like to see the test results at distances of over 300M.
        
Laser Optical Peak Power measurements taken?
    
Beam divergence tests undertaken?
    
How the units performance varied over temperature?
    
Specific details on the firmware version that is now being used  which will have changed since the unit was type approved.  
 Pulse width
 Duty Cycle

The information was released on 27 June 2011:

The Home Office does not require tests of laser speedmeters at specified distances.  Nevertheless the police in their evaluations of the Ultralyte 1000 speedmeter did measure the speed of vehicles at distances over 300 m.  I attach all these measurements.  The data includes the distance from the Ultralyte 1000 speedmeter to the target, the speed measured by the Ultralyte 1000 speedmeter, and the speed measured by a reference system. This data is produced by the police for police purposes and are not precision measurements.
   
The laser has received class 1 laser certification. See the attached summary of tests against the Speedmeter Handbook v4. 
 
The nominal beam divergence is 3 mrad.
    
The Ultralyte 1000 has been tested against the sections of the Speedmeter Handbook v4 that deal with temperature storage and performance (§7.1 and §7.2).  I attach a copy of the test results summary.
    
The firmware in the Ultralyte 1000 has not changed since it was type approved.  The version number is v3.03e.
  
The pulse width of the transmitting laser is about 18 ns. 
 
The duty cycle of the transmitting laser is about 2.25 x 10-6 (from pulse width of 18ns and pulse repetition frequency of 125Hz).

Date: Thu Jun 30 15:45:31 BST 2011