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Reflection Probe Stands![]()
RPS-SMA Adjustable SMA RPH-SMA Compact SMA RPH Compact Ø1/4" Application Idea RPS Ø1/4" Probe Stand Holding ![]() Please Wait Features
These fiber optic probe holders secure Ø1/4" probes or SMA-connectorized fiber optic bundles or cables in close proximity to a sample. They are easily adjustable and will not allow the fiber to move during measurements. Fiber optic probes, such as our reflection/backscatter bundle probes, can be secured with a vertical orientation for specular reflection spectroscopy, or at 45° for diffuse reflection spectroscopy. In addition, the twin 45° mounting bulkheads of the RPS-SMA and RPH-SMA allow two separate fiber patch cables to be used for specular reflection measurements with a 45° angle of incidence (AOI). Reflection Spectroscopy ApplicationThorlabs offers reflection spectroscopy probes that can be used along with our CCD spectrometers, broadband fiber-coupled light sources, and the fiber probe holders sold below to take diffuse reflection, specular reflection, and color measurements. Spectrometers Light Sources ![]() Click to Enlarge Diffuse Measurement Taken at 45° Using RPH Holder Block Reflection Probe Fiber Bundles Reflection Probe Holders
![]() ![]() Click to Enlarge Underside of the RPA-SMA Fiber Holder Arm ![]() Click for Details Specular Reflectance Measurements at 90° ![]() Click for Details Diffuse Reflectance Measurements at 45°
Thorlabs' RPS and RPS-SMA Adjustable Fiber Optic Probe Stands are designed to hold Ø1/4" or SMA-connectorized fiber bundle probes (respectively) above a sample at 45° for diffuse measurements or 90° for specular measurements. Each set is comprised of an adjustable fiber holder arm (also available separately), a Ø1/2" optical post with engraved metric height scale, and a Ø6" (Ø152.4 mm) base with engraved concentric circles and grid pattern. The 90° mount of the RPS-SMA stand and RPA-SMA arm places the end of the probe flush with the bottom of the arm, allowing it to be in direct contact with the sample, as seen in the photo to the far right; the arm also features twin 45° mounting bulkheads that allow two separate fiber patch cables to be used for specular reflection measurements with a 45° angle of incidence (AOI). Sample legs with Ø1/4" probes are held in place on the RPA arm using a TS25H thumbscrew, while SMA-connectorized sample ends screw into the bulkheads on the RPA-SMA arm. Each arm's height can be adjusted using a TS25H thumbscrew, which has a spring-loaded, retractable Delrin®* tip. The spring-loaded tip provides sufficient force to hold the arm in place as final positional adjustments are being made, allowing for precise height adjustments. When using the RPS stand, samples up to 2.16" (55 mm) tall can be accommodated using the included optical post. The RPS-SMA stand can accommodate samples up to 2.36" (60 mm) tall. For taller samples, the included post can be easily replaced with a longer imperial or metric Ø1/2" post. The post is secured to the base by an M6 cap screw on the underside of the base, which can be removed using a 3/16" or 5 mm balldriver. If replacing the original post with an imperial Ø1/2" post, a SH25S063 1/4"-20 cap screw is also required. Replacement RPA and RPA-SMA post holder arms are also available separately. These arms can also be used to mount Ø1/4" probes or SMA-connectorized optical fiber within custom optomechanical setups by mounting them to Ø1/2" posts. *Delrin® is a registered trademark of DuPont Polymers, Inc. ![]() ![]() Click to Enlarge Diffuse Reflectance Measurement Using an RPH-SMA Mount ![]() Click to Enlarge Specular Reflectance Measurement Using an RPH Ø1/4" Probe Holder ![]() Click to Enlarge Schematic of the RPH
The RPH Holder Block for Ø1/4" Fiber Optic Probes allows a fiber bundle tip to be placed directly above a sample. Background light may be blocked by covering the bore that is not in use with masking tape. Two ports are available for securing the probe at 45° or 90° with respect to the sample. The probe can be secured at various heights using one of two TS25H thumbscrews. The probe tip should never be inserted all the way through the block or flush with the bottom of the block, as any contact with the sample can result in damage to the fiber end face. The RPH-SMA Holder Block for Fiber Optic Probes allows a fiber tip with an SMA905 connector to be placed 0.48" (12 mm) from a sample while subsequently blocking out background light. To use, place the RPH-SMA directly on a flat sample, with the exit port on the bottom of the unit (visible in the photo above) over the area to be measured. The block has three SMA connector bulkheads and two removable CAPN1 bulkhead caps (additional caps sold below). These caps can be used to cover the unused SMA ports during a measurement to block stray room light. In addition, the twin 45° mounting bulkheads allow two separate fiber patch cables to be used for specular reflection measurements with a 45° angle of incidence (AOI). On both of the holder blocks, the 45° and the 90° ports share a common exit hole, as illustrated in the schematic of the RPH and the photo of the underside of the RPH-SMA above. | |||||||||||||||||
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