Ocean Optics S1024DW Install - Manual (Page 39)

36
Sampling Optics
Ocean Optics offers numerous spectroscopic accessories. A short description of those accessories featured
in this manual is listed below.
•
The 74-UV and 74-VIS Collimating Lenses screw on to the end of SMA-terminated optical fibers and
other sampling optics to convert divergent beams of radiation (light) into a parallel beam.
•
The 74-UV-90 Reflector for collimating lenses has a mirror located under its cap that reflects light
from the collimating lens to 90°.
•
The 74-OPM Optical Post Mount is a 3/8-24 threaded black anodized aluminum assembly used for
mounting collimating lenses on breadboard laboratory tables, rail carriers and other bench plates.
•
The 74-ACH Adjustable Collimating Lens Holder is a versatile assembly for mounting lenses at
multiple positions, and is especially useful for large or thick samples.
•
FVA-UV Fiber Optic Variable Attenuator decreases the magnitude of light entering the optical bench.
•
The WS-1 Diffuse Reflectance Standard is a compact physical standard for use in performing diffuse
reflectance measurements, especially color analysis.
•
The ISP-REF Integrating Sphere is an illuminated sampling optic that couples via optical fiber to our
spectrometers to measure reflectance of solid objects or emission of spectral sources.
Sampling Optics: 74-UV and 74-VIS Collimating Lenses
The 74-UV and 74-VIS C OLLIMATING L ENSES screw on to the end of SMA-terminated optical fibers and
other sampling optics to convert divergent beams of radiation (light) into a parallel beam. In order to
obtain accurate data, the light entering the sample and the light collected after exiting the sample must be
well collimated.
Application Tips
•
Using a collimating lens is easy. Screw a collimating lens onto the end of any SMA-terminated port to
collect, shape, or focus light.
•
Collimating lenses are useful for any optical setup that requires the acceptance or transmission of
parallel beams of light at either the illumination source or at the entrance optics -- or at both ends
(illumination and read) of the setup. That's important because the optical fibers Ocean Optics specifies
for use with its spectrometers and light sources have a field of view (FOV) of ~25
°
-- an acceptance
angle that may not be appropriate for some experiments. Collimating lenses are adjustable, providing
FOV angles from collimation (near 0
°
) to ~45
°
. Without the collimating lenses, the light would
disperse more than is required for efficient transmission and collection of the signal.
•
For directions on adjusting the focus of a collimating lens, see Appendix A .
Specifications
Lens diameter: 5 mm
Lens length: 10 mm
f-number: f/2
74-UV material: Dynasil 1100 quartz (200 nm – 1.5
µ
m)
74-VIS material: BK 7 glass (360 nm - 2
µ
m)
Lens barrel: stainless steel with black oxide finish
Threads: 3/8-24