Comparison of the Frequency Response and Voltage Tuning Characteristics of a FFP and a MEMS Fiber Optic Tunable Filter

2004 ◽  
Author(s):  
Frank Bucholtz ◽  
Mark Seaver ◽  
Michael D. Todd
Keyword(s):  
Frequency Response ◽  
Fiber Optic ◽  
Tunable Filter ◽  
Voltage Tuning

Dryer Effluent Monitoring in a Chemical Pilot Plant via Fiber-Optic Near-Infrared Spectroscopy

1998 ◽  
Vol 52 (5) ◽  
pp. 717-724 ◽  
Author(s):  
Charity Coffey ◽  
Alex Predoehl ◽  
Dwight S. Walker
Keyword(s):  
Real Time ◽  
Pilot Plant ◽  
Near Infrared ◽  
Fiber Optic ◽  
Tunable Filter ◽  
Calibration Model ◽  
Gas Cell ◽  
Rotary Dryer ◽  
Vapor Stream ◽  
Effluent Stream

The monitoring of the effluent of a rotary dryer has been developed and implemented. The vapor stream between the dryer and the vacuum is monitored in real time by a process fiber-optic coupled near-infrared (NIR) spectrometer. A partial least-squares (PLS) calibration model was developed on the basis of solvents typically used in a chemical pilot plant and uploaded to an acousto-optic tunable filter NIR (AOTF-NIR). The AOTF-NIR is well suited to process monitoring as it electrically scans a crystal and hence has no moving parts. The AOTF-NIR continuously fits the PLS model to the currently collected spectrum. The returned values can be used to follow the drying process and determine when the material can be unloaded from the dryer. The effluent stream was monitored by placing a gas cell in-line with the vapor stream. The gas cell is fiber-optic coupled to a NIR instrument located 20 m away. The results indicate that the percent vapor in the effluent stream can be monitored in real time and thus be used to determine when the product is free of solvent.

Efficient miniature fiber-optic tunable filter based on intracore Bragg grating and electrically resistive coating

1998 ◽  
Vol 10 (3) ◽  
pp. 361-363 ◽  
Author(s):  
H.G. Limberger ◽  
Nguyen Hong Ky ◽  
D.M. Costantini ◽  
R.P. Salathe ◽  
C.A.P. Muller ◽  
...  
Keyword(s):  
Fiber Optic ◽  
Tunable Filter ◽  
Bragg Grating ◽  
Resistive Coating

Distributed single fiber optic vibration sensing with high frequency response and multi-points accurate location

2020 ◽  
Vol 129 ◽  
pp. 106060 ◽  
Author(s):  
Pengfei Ma ◽  
Kun Liu ◽  
Zhenshi Sun ◽  
Junfeng Jiang ◽  
Shuang Wang ◽  
...  
Keyword(s):  
Frequency Response ◽  
High Frequency ◽  
Fiber Optic ◽  
Single Fiber ◽  
High Frequency Response ◽  
Vibration Sensing

Frequency response of interferometric fiber‐optic coil hydrophones

1980 ◽  
Vol 67 (S1) ◽  
pp. S31-S31
Author(s):  
J. Jarzyuski ◽  
R. Hughes ◽  
T. R. Hickman ◽  
J. A. Bucaro
Keyword(s):  
Frequency Response ◽  
Fiber Optic
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