FAZT I4W Interrogator

September 20, 2018
FAZT I4-16W Interrogator
September 20, 2018

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The FAZT I4W optical sensing instrument is a revolutionary new breed of interrogator. Featuring 4 monitoring channels the FAZT-I4W is the company’s lower cost workhorse model instrument. Enclosed in a field deployable stainless-steel casing, the instrument provides peak detection for up to 30 Fiber Bragg Gratings (FBG) based sensors on each of its 4 channels. The instrument can be operated in full spectrum and sensor peak detection modes. The FAZT I4W is optimized for both static and dynamic measurements.

Our family of rugged FAZ Technology interrogators is used extensively in marine, railways, roads, energy, civil, geotechnical, industrial, security, medical, and many other commercial applications. This workhorse model is specifically useful for security, civil engineering, energy, process control, material qualification labs and R&D programs. The industrial grade design scales well in volume production.


High resolution, precision and accuracy: The FAZT I4W Interrogator returns measurements in 1pm steps across its wavelength range. Using patented FAZ Technology scan-by-scan calibration to its internal Gas Cell, the instrument features 0.5pm absolute precision and absolute accuracy of 3pm.

Top reliability: The FAZT I4W Interrogator is based on a semiconductor tunable laser that has no movable parts, no tunable filters, and no opto-mechanical switches, which delivers top reliability over a broad temperature range to form an integral part of a very rugged and reliable sensing system.

Adaptive to more types of sensors: The integrated electronics and embedded software allow the user to quickly adapt the instrument’s performance parameters to fit many different sensor configurations. Designed to monitor many types of sensors from narrow bandwidth (100pm) FBGs used in highsensitivity accelerometers, pressure sensors, hydrophones, and microphones, to wide bandwidth (1.5nm) FBGs used in bio-sensing. Hardware implementation of peak tracking algorithms for FBG sensors including programmable gain per sensor, width/height thresholds, and distance to sensor setting for accuracy at long distance. The laser output power is -1 dBm to -3 dBm and performance is maintained even with 20dB optical power loss on each sensors channel.

Systems and network ready: High speed data acquisition and on-board computer processing make the FAZT I4W easy to use and easy to transmit large volumes of data by network connection. Trigger Input support enabling synchronization of multiple optical and electrical sensor systems. The Ethernet port for high speed data transfer is 100Mbit/s, with all interrogator settings programmable over a REST interface. NTP (<10ms timestamps) Time accuracy with optional GPS time (<10µs timestamps).

Low Cost and High Quality: The FAZT I4W Interrogator is based on the company’s flagship ultimate performance FAZT I4G Interrogator and it has been optimized to address applications demanding a lower cost while maintaining the quality and reliability of a premium grade instrument.

Note 1: FBGs from 100pm to 1.5nm BW@3dB (FWHM) are supported. Best performance results obtained using 160pm FBGs.
Note 2: Dynamic programmable receiver gain per sensor (4 levels covering 12dB of gain) delivering >25dB optical power dynamic range (saturation – minimum detectable power levels) at kHz sweep rate.

Applications include Security, Civil Engineering, Industrial, Energy, Material Qualification Labs, and Research Centers

Femto Sensing International undertakes a rigorous development process before products 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: femtosensing.com

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