S4 Static and Dynamic Interrogators

S4PC Product Image
S4PC Static and Dynamic Interrogators
November 30, 2022
SPIE Photonics West in San Francisco, January 30 to February 2, 2023
January 6, 2023
FSI S4 Product Image

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Resolution, accuracy and dynamic range: The S4 Interrogator provides measurements across its wavelength scanning range of 80nm. The instrument features 1pm resolution and +/- 12pm accuracy over the entire operating temperature of the instrument, and 30dB dynamic range with automatic control adjustments. Manual settings option for thresholds and gain stages also included.     

Excellent reliability: The S4 Interrogator is based on a solid-state IEC 60825-1 Class 1 laser platform that has been deployed in large volume in various field applications worldwide. The interrogator has no tunable filters. Excellent reliability over the standard operating temperature range of -5C to +50C. The S4 is suitable for use as an integral part of a very rugged and reliable sensing system. 

Adaptive to more types of sensors: The integrated electronics, depolarized light source, static and dynamic configurations, and embedded software allow the user to quickly adapt the instruments performance parameters to fit many different sensor configurations. Designed to monitor many types of sensors from narrow bandwidth (200pm) FBGs used in temperature, strain, displacement, tilt and pressure sensors, to wide bandwidth (3.0nm) FBGs used in bio-sensing. Hardware implementation of peak tracking algorithms for FBG sensors included. 

Low Cost and High Quality: The S4 Interrogator addresses applications demanding the lowest cost while maintaining the reliability of a high quality instrument.


The S4 optical sensing instrument is an economic commercial grade interrogator, featuring 4 monitoring channels. This Class 1 Laser instrument is enclosed in a field deployable enclosure, and can be operated in full spectrum and in sensor peak detection modes. The S4 is available in both static (1Hz scan rate) or dynamic (800Hz scan rate) models, and provides measurements of up to 30 Fiber Bragg Gratings (FBG) based sensors on each of its 4 channels. 

The rugged technology platform on which our SX interrogators pare based is used extensively in civil engineering, geotechnical, roads, mines, energy, industrial, medical, and many other commercial applications. This economy model is specifically useful for monitoring temperatures and the slow changes of strains, tilt or inclination, pressure, and other engineering parameters. The platform is also suitable for process control, material qualification labs, and R&D programs. The industrial grade design scales well for volume production.

Note 1: FBGs from 200pm to 3.0nm BW@3dB (FWHM) are supported. Best performance results obtained using 300pm FBGs.

Note 2: The enhanced NANOSENSE software available for the SX family of interrogators is the result of years of experience with field installations of Optical Sensing Systems and contains an easy to use sensors configurator, auto and/or manual threshold settings for each FBG, sensors referencing, post-processing of data with rolling functions over the collected data, notifications and alerts based on user set threshold values, replicating of existing sensors functions, and auto-recovery after accidental power outages. Includes provision for 3rd party developers via API support. The NanoSense software is provided free of charge with each S4 and/or S4PC interrogator. 

Applications in Civil Engineering, Geotechnical, Industrial, Energy, Material Qualification Labs, Research

Femto Sensing International undertakes a rigorous development process before product release. The company is also firmly committed to continuous improvements after release to ensure performance and reliability to the highest standards; hence, specifications are subject to update without notice.

Femto Sensing International, LLC
/ 3657 Peachtree Road, Suite 10A, Atlanta, GA, 30319, USA / T: +1 404 326 3469, E: sales@femtosensing.com, W: www.femtosensing.com

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