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Enlightening Spectroscopy Spectrometers | Light Sources | Fiber Optics | Software | Accessories

INTRODUCTION Dear customer, After being in this industry for over 25 years, I am still excited and proud to present to you our new catalog. In this edition, we showcase all of our instruments and accessories for fiberoptic spectroscopy. As the leading innovator in the development and application of miniature spectrometers we continue to develop and introduce new instruments. Avantes’ instruments and accessories are also integrated into many OEM applications in many industries and markets throughout the world. With a quarter of a century of experience in fiber optic spectroscopy and...

NEW IN THIS CATALOG AvaSpec-Mini-NIR256-1.7 The latest addition to our popular CompactLine Mini-series: the AvaSpec-Mini-NIR! This compact, versatile near-infrared spectrometer operates in a 900-1750 nm range and is suitable for various applications, including food analysis and recycling. Find out more on page 31! AvaSpec-ULS2048x64TEC-EVO Updated and improved: this spectrometer has a thermoelectrically cooled, back-thinned detector that enables long integration times with low noise levels. The cooling of this spectrometer can reduce the temperature of the CCD chip to -30°C against ambient....

Spectrometers 6 Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Optical Bench Design. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 How to Configure a Spectrometer for Your Application. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ....

Transmission Dip Probes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 124 Transmission Dip Probes with Variable Path Length. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 125 Custom Fiber Assemblies and Probes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 126 Collimating...

INTRODUCTION A spectroscopic instrument or spectrometer generally consists of entrance slit, collimator, a dispersive element, such as a grating or prism, focusing optics and detector. In a monochromator system there is normally also an exit slit, and only a narrow portion of the spectrum is projected on a oneelement detector. In monochromators the entrance and exit slits are in a fixed position and can be changed in width. Rotating the grating scans the spectrum. The development of micro-electronics during the 90’s in the field of multi-element optical detectors, such as Charged Coupled...

Thanks to the need for fiber-optics in communication technology, low-absorption silica fibers have been developed. Similar fibers can be used as measurement fibers to transport light from the sample to the optical bench of the spectrometer. The easy coupling of fibers allows a modular build up of a system that consists of a light source, sampling accessories and a fiber-optic spectrometer. Fiber-optic spectrometers enable the introduction of sampling into harsh and difficult to access environments as well. The modularity, flexibility and speed of measurement made possible by fiber-optic...

Optical Bench Design Spectrometers Avaspec-ULS Optical Bench Design: Symmetrical Czerny-Turner 1. 2. 3. 4. 5. 6. Detector SMA Connector Grating Slit, mode stripper 2nd mode stripper Collimating mirror Focusing mirror CPC light traps CPC light traps DCL-UV/VIS OSC-filter The heart of most AvaSpec fiber-optic spectrometers is an optical bench with 37.5, 50, 75 or 100 mm focal length, developed in a symmetrical Czerny-Turner design. Light enters the optical bench through a standard SMA-905 connector and is collimated by a spherical mirror. A plain grating diffracts the collimated light; a...

Avantes offers a variety of different detector types, each with different sensitivity curves (see Figure 3a and 3b on page 20). The AvaSpec instrument line is divided into multiple groups based on general requirements. The AvaSpec-Starline is comprised of general purpose UV/VIS instruments with low-cost CCD or CMOS detectors. The AvaSpec Sensline is comprised of higher performance back-thinned CCDs and thermo-electrically cooled CCD UV/VIS instruments. These instruments are particularly better in the UV and NIR range, compared to standard CCD and CMOS detectors. The AvaSpec NIRLine is...

Table 1 Quick Reference Guide for Spectrometer Configuration AvaSpec model Laser diode Thin films Fruit sugar Gemology High resolution High UV/NIR sensitivity The grating can only be changed by Avantes. Therefore, choose your grating wisely. Our application specialists are available to support you with your choice. In general, a higher resolution means a lower bandwidth. By combining multiple spectrometers in our AvaSpec-Dual or rack-mountable versions, you can create one virtual spectrometer with high-resolution and high bandwidth.

How to Choose the Right Grating A diffraction grating is an optical element that separates incident polychromatic radiation into its constituent wavelengths. A grating consists of series of equally spaced parallel grooves formed in a reflective coating deposited on a suitable substrate. The way in which the grooves are formed separates gratings in two types, holo-graphic and ruled. The ruled gratings are physically formed onto a reflective surface with a diamond on a ruling machine. Gratings produced from laser constructed interference patterns and a photolithographic process are known as...