Light meter for visible and UV light with RS232 output series B103

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The sensor measures light intensity in micro Watt / square cm.  The results of these measurements are sent to a PC.  The letters shown on the screen are the following for the measured values:

UVL = UV light intensity     RED = Red light     GRE = Green light     BLU = Blue light


Technical Data:
Power: Powered from PC or PDA (3.2...5V @ 20mA)
Materials: Housing = ABS natural   Seal = Sealon PTFE   Screws = stainless steel 301
Color formula: see color patent
Connection: 9 pole D connector (Palm adaptor available)
Work Distance: Any, just point it towards incoming light
Resolution: A number between 0 and 999 within 0.1% accuracy

User Instructions



Like any analytical instrument there are many other things you can do with it.  The output from your measurement shows in the PC and instead of using the calculated data’s from the sensor you can create your own calibration by using the formula above or other manipulations.



Instant analysis calibrates the light intensity in the microprocessor from the sensor. To recalibrate simply use your own calibration method = light intensity and correct the incoming data’s from the sensor. You always can use the values from the sensor as default. You can calculate the new values  or put the formula in your PC software.  Calibrated to 10 micro watt / square cm for max output.


Figure 1:  Spectral Intensity of UV and visible light calibrated to 10 micro watt / square cm for max output.

Figure 2:  Same as figure 1 with the addition of a typical light bulb and its output.


Example to show total light energy (figure 1):

A halogen light with 3000 Lx is shown into the sensors aperture and the following calculations are done:

     a) total energy:  convert 3000 Lx to Watts  -  0.0015 × 3000 W = 5 Watts

     b) This energy has to be seen in a sphere of 1 meter radius, the surface area is 12.5 cm2

     c) The sensors aperture is 10 mm2

     d) The light energy going in to the sensor in one meter is: (5 watts × 10 mm2) ÷ (10 cm2) = 5 micro Watts


Example to show light measured with a sensor (figure 2):

The total amount of the energy of the light bulb includes a part of the infrared light.  Light energy seen over the spectra is measured in the light sensor.  Light energy for each color is the following:

The integral from the sensitivity of the sensor in its spectra x part of the light energy from the spectra going in the sensor.  In this example the sensor shows the following outputs:

     UV     -  1.33 micro Watt / cm2

     Blue   -  1.63 micro Watt / cm2

     Green -  2.38 micro Watt / cm2

     Red    -  3.12 micro Watt / cm2