Inline Filter Holders for Measuring Absorbance and Transmission

Inline filter holders from Ocean Optics are sturdy, convenient accessories for measuring the absorbance and transmission of optical filters and solid samples. Several options are available depending on your application needs.

The FHS-UV inline filter holder is an affordable accessory for quick absorbance or transmission measurement of optical filters. It includes 74-UV 5-mm f/2 collimating lenses for maximum light throughput and a manual light-block wheel for dark readings. This holder is a simple, effective tool for measuring and accommodating filters in optical setups.

The FHS-LVF (Linear Variable Filter Holder) is an inline sampling optic designed for absorbance and transmission measurements. It features two collimating lenses and accommodates both single-filter and double-filter slide carriers. This setup is particularly useful for experiments requiring high-pass, low-pass, or bandpass filters.

The FHS-VF (Variable Filter Holder) is an inline filter holder designed for absorbance and transmission measurements. It features two collimating lenses and accommodates various filter types, including single-filter and double-filter slide carriers. This setup is particularly useful for experiments requiring precise control over light filtering.

The INLINE-SFH is a compact inline filter holder that connects to optical fibers on either side, allowing users to measure optical filters directly in the light path. It accommodates filters 10–12.7 mm in diameter and up to 9 mm thick, making it ideal for absorbance and transmission measurements in fiber-coupled spectroscopy setups.

Feature / Part Number	FHS-UV	FHS-LVF	FHS-VF	INLINE-SFH
Filter Type	Standard round filters	Linear Variable Filters (LVFs)	Standard slide filters	Round filters
Filter Size	Up to 25 mm diameter, 6 mm thick	LVF slide carriers	Single/double slide carriers	10–12.7 mm diameter, up to 9 mm thick
Collimating Lenses	74-UV f/2 lenses for high throughput	Dual lenses for precise light control	Dual lenses for accurate alignment	Not included
Special Features	Manual light-block wheel for dark readings	Supports spectral shaping and dynamic filtering	General-purpose absorbance/transmission	Compact design for inline fiber setups
Fiber Connections	SMA connectors	SMA connectors	SMA connectors	SMA connectors
Applications	Quick absorbance/transmission measurements	Fluorescence, stray light reduction	Fixed-wavelength filtering	Inline absorbance/transmission in tight setups
Use Case	Affordable and practical	Flexible and filter-precise	Precise and versatile	Compact and fiber-ready