Cary 14 Spectrophotometer

The double beam design of the Cary 14 provided rapid, simplified analysis by simultaneously measuring the transmittance of both the sample and the reference over the entire spectral range.

[7] To take readings in the ultraviolet or visible range, either a deuterium or tungsten lamp was used, with the light focussed into the entrance slit.

[9] By combining the Littrow prism and the echelette grating, the Cary design minimized noise and interference (stray light) while obtaining high resolution measurements over a very wide dynamic range.

[16] Integrating sphere accessories were available which enabled diffuse reflectance measurements, The Cary 14 was produced until 1980.

[18] Although the Cary 14 is out of production, refurbished versions of it that retain the original optics but with an air cooled deuterium lamp, a lead-sulphide IR detector, modernized, digital electronics and recording, automatic lamp and detector change at selected wavelengths, extensive accessories, and flexible operation automation that includes the ability to integrate the instrument into a larger system are commercially available as of 2017.

[19] Versions of modernized Cary 14 spectrophotometers extend the wavelength range to 2500 nanometers in the near infrared spectrum.