Refractive index determination

The refractive index is used for a lot of applications. We offer the determining of the refractive index at a speficic temperature and wavelength as a service for our customers. You can generate a reference material for checks independent of temperature of your refractometers to verify, if your instruments are still working correctly. Furthermore we can measure your own samples to validate your measuring results.

RI_Water_589nm vs temp vs wavel

Figure: left: Exemplary graph of the refractive index  of water with temperature at the sodium D-line(nD), 589nm. Right: Exemplary graph of the refractive index  of water with wavelength at 20°C.

Determining of refractive index is possible for:

  • Solid and liquid samples
  • Temperature in the range of 5…95°C (liquids and solids), other temperatures on request
  • Wavelengths (selected examples): 404.7nm, 546.1nm, 578.5nm, 589.3nm, 643.8nm, 852.9nm, 895.2nm, more wavelengths on request
  • We are using our reference refractometer or for highest demands our reference goniometer as well
  • Precision for the whole measuring range at all wavelengths: up to ΔRI = 2*10-5 (depends on used sample)

ri_water eyecandy

Figure: Refractive index of water via temperature and wavelength

Dear valued customer and business friend,

We are taking all possible measures to secure the health of our employees as well as our customers.

As we have already informed you, Schmidt+Haensch remains fully operational.

We are organising whenever possible work from home offices. Our production lines are continuously producing and our supply chains are so far secured.

We are most interested to offer our services as usual. Instead of personal visits we have built up internet communications in order to help you remotely.

All our contacts as well as phone numbers remain accessible.

For service issues please do not hesitate to contact us via e-mail to or telephone under +49 (030) 417 072 – 41 / - 42

For sales inquiries please contact us via e-mail to or call our sales engineers.

We wish you to stay well and healthy.

Let us try to overcome these most exceptional circumstances by looking after each other with the necessary care and distance.

Best regards

Mathis Kuchejda


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