NIR Spectroscopy applications typically require long light guides incorporating 1, 2, or 4 silica fibers in a jacket with Kevlar strain relief. They serve to connect the spectrometer instrument and probe head. 300 and 600 micron fiber cores are the most common sizes. Cable lengths of 2M, 5M, 10M, are common, while 500M lengths (and longer) have been manufactured. The typical wavelengths of interest are 800nm to 2,500nm
A fiber assembly consisting of outer steel jacket, inner Polyurethane, PVC or Polypropylene tubing, a Kevlar strength member and a Polyimide coated fiber is called a “cable”. The O.D. is ~ 4.0mm (3.8mm).
Our cabling method uses a Kevlar braid, rather than a single Kevlar fiber, to completely surround the fibers and support the assembly. The Kevlar tube, inner plastic tube, a are bonded to both end tips, and the outer steel jacket is swaged at both ends.
These cable assemblies can be used with all detectors on the market today, including Silicon-based CCDs (for the shorter end of the NIR range), and InGaAs and PbS devices for wavelengths over 1000nm. Some instruments combine silicon-based and InGaAs detectors in the same instrument. Such instruments can record both UV-visible and NIR spectra ‘simultaneously’. We can customize the design of the cable to optimize signal collection of these instruments.
for shorter applications, (less than 10M) and depending on the wavelengths of interest, we can design a soft glass emitter, and combine the silica receiver for an optimal cost/performance package.
Due to the variety of configurations and lengths required, these cables are made to specification. Contact us with details.