Julixing Instruments

Julixing Instruments

Julixing Instruments

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What Is an Integrating Sphere?

What it’s not

Okay, so you know that you can measure laser power with a thermal or photodiode head.  An integrating sphere is actually not an additional sensor category.  It is more like a super-accessory for a photodiode detector, which does the actual power measurement.

What it is


Integrating Sphere

As you can see in this picture, a widely diverging beam enters the aperture of an integrating sphere and bounces around.  The unique quality of an integrating sphere is its highly-reflective, scattering coating.  This effectively takes the incident beam and spreads it evenly throughout the sphere.

Click here to read more about how integrating sphere laser sensors work.

So what’s it good for?

Now, you might be asking yourself, “Well, that seems pretty nifty, but why not just use the photodiode itself?”

In many cases, a photodiode is indeed more than sufficient.  However, for some lasers with very high divergence, the photodiode will not be able to measure the entire beam.  Since the integrating sphere divides the beam uniformly in the sphere, we can use a small photodiode detector to measure a known fraction of the beam’s power.  (This fraction is the ratio of the photodiode aperture to the entire sphere.)

On top of that, the integrating sphere also lowers the power entering the photodiode, so one can use an integrating sphere sensor for much higher powers than a regular photodiode.

    Standard:       IEC 61032 IEC 60061 IEC 60335 IEC 60529 IEC 60068 IEC 60695 VDE 0620 UL AS/NZS3112
Test Probe Go No Go Gauge Spring Impact Hammer Integrating Sphere Finger Probe Test Test Probe Pin Probe Weighing Sensor
Glow Wire Tester Impact Test Hammer Go Gauge UL Test Finger Probe Hipot Tester Test Probe Needle Impact Testing Machine
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