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Production & Testing > Phos-4 LED Source
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Production & Testing

The Phos-4 makes an indispensable tool for production and testing.  It’s multiple control interfaces can dovetail to a huge range of test systems.  Whether you need to provide a voltage controlled intensity, trigger a low intensity light pulse using a logic input or provide a predefined set of intensities and wavelengths using the UART or USB interfaces, the Phos-4 can do it all

Case Study : A 10 nano-Watt Light Source for Routine Production

Generating a precise, stable low intensity light pulse can be a complex design problem.  Measuring low light levels whether with a calibrated PIN photodiode or thermopile is fraught with difficulties such as back ground light, sources of heat and instrumentation drift.  The Phos-4 can be used to provide a solution to this problem. The method is based on making a pair of measurements at high and low current. This allows the ratio of the intensities between the two currents to be known. First pair of measurements is made with the LED Module positioned adjacent to the fibre optic mount to maximise the powers. The LED module is then moved away until the power at the maximum current is the desired output intensity times the intensity ratio. The LED current is then simply switched to the lower current, giving the desired optical intensity.

Step 1

Position the LED module adjacent to the Fibre optic connector;
Set the current to 800mA;
Wait for the temperature to settle to within 0.1°C then measure the power;
[Example values = 444µW]
Set the current to 2mA;
Wait for the temperature to settle to within 0.1°C then measure the power;
[Example values = 1.55µW]

Step 2

Set the LED current to 800 mA and wait for the temperature to settle to 0.1°C;
Calculate the power to be measured at 800mA;
[Example values : (10nW x 444µW)/1.55µW = 2.86µW]
Slide the LED module away from the fibre connector until the power is just smaller than the required power;
Lock the LED on to the pushrod and then use the Z-Adjustment Screw to set the power to the required level;
Turn off the LED and Zero the optical power meter;
Set the LED current to 2 mA and wait for the temperature to settle to 0.1°C;
Check the optical power output
[Example values : 10nW]