nova II™ UV-Vis/SW-NIR Spectrophotometer
The nova II is the heart of any spectrophotometric Applied Analytics system. This device performs absorbance spectroscopy by transmitting a light signal across the path of a sample fluid via fiber optic cables. The nova II's wavelength domain of spectral acquisition is known as UV-Vis/SW-NIR (shorthand for ultraviolet-visible / shortwave near infrared).
- The light source. The standard 200-800 nm model nova II uses a pulsed xenon lamp.
- The slit. This refers to the narrow aperture in the plate located at the focus of the spectrophotometer lens. It is exactly the size of one photodiode in the array, thus ensuring that each wavelength band is projected only onto the corresponding photodiode.
- The holographic grating. Physical separation (dispersion) of the received light signal and spectral imaging onto the diode array are both accomplished by the concave holographic grating. The angle in which the light is dispersed is proportional to the wavelength, such that each wavelength is differentiated and imaged onto a different point in the diode array.
- The photodiode array. The linear array contains 1,024 light-sensitive elements, each measuring an assigned wavelength; all the measurements occur in parallel such that the raw data comprises a complete spectral acquisition.