scholarly journals Water Temperature and Salinity Measurement Using Frequency Comb

2019 ◽  
Vol 9 (23) ◽  
pp. 5043
Author(s):  
Haoyun Zhang ◽  
Xinyang Xu ◽  
Haihan Zhao ◽  
Fanpeng Dong ◽  
Zhiwen Qian ◽  
...  
Keyword(s):  
Water Temperature ◽  
Real Time ◽  
Cross Correlation ◽  
Frequency Comb ◽  
Michelson Interferometer ◽  
Laser Frequency ◽  
Empirical Formulas ◽  
Distance Information ◽  
Optical Distance ◽  
Distance Difference

Water temperature and salinity are key parameters in many fields such as industry, forestry and agriculture. In this paper, we, theoretically and experimentally, demonstrate a method which is capable of water temperature and salinity measurement based on a laser frequency comb at 518 nm. We have developed a simple Michelson interferometer system. By scanning a mirror on a precision displacement platform, a pair of cross-correlation patterns can be obtained. The real-time optical distance information from these cross-correlation patterns can be used to calculate the optical distance difference changes. Temperature and salinity can be measured via these changes, aided by the empirical formulas. Compared with the reference values, our results show the differences of below 0.12 °C for temperature measurements, and 0.06 ‰ for salinity measurements. The obtained results indicate that our method can offer a powerful scheme for future temperature and salinity measurement.

scholarly journals Three-Dimensional Imaging by Frequency-Comb Spectral Interferometry

Sensors ◽  
2020 ◽  
Vol 20 (6) ◽  
pp. 1743
Author(s):  
Haihan Zhao ◽  
Ziqiang Zhang ◽  
Xinyang Xu ◽  
Haoyun Zhang ◽  
Jingsheng Zhai ◽  
...  
Keyword(s):  
Imaging System ◽  
Frequency Comb ◽  
Michelson Interferometer ◽  
Three Dimensional ◽  
Fiber Amplifier ◽  
Laser Frequency ◽  
Linear Cavity ◽  
Three Dimensional Imaging ◽  
Spectral Interferometry ◽  
The Difference

In this paper, we demonstrate a three-dimensional imaging system based on the laser frequency comb. We develop a compact, all-fiber mode-locked laser at 1 μm, whose repetition frequency can be tightly synchronized to the external frequency reference. The mode-locked state is achieved via the saturable absorber mirror in a linear cavity, and the laser output power can be amplified from 4 mW to 150 mW after a Yb-doped fiber amplifier. Three-dimensional imaging is realized via the spectral interferometry with the aid of an equal-arm Michelson interferometer. Compared with the reference values, the measurement results show the difference can be below 4 μm. Our system could provide a pathway to the real industry applications in future.

scholarly journals Controlling and Phase‐Locking a THz Quantum Cascade Laser Frequency Comb by Small Optical Frequency Tuning

2021 ◽  
pp. 2000417
Author(s):  
Luigi Consolino ◽  
Annamaria Campa ◽  
Michele De Regis ◽  
Francesco Cappelli ◽  
Giacomo Scalari ◽  
...  
Keyword(s):  
Quantum Cascade Laser ◽  
Frequency Tuning ◽  
Frequency Comb ◽  
Phase Locking ◽  
Laser Frequency ◽  
Optical Frequency ◽  
Quantum Cascade

Line profile analysis of an astronomical spectrograph with a laser frequency comb

2014 ◽  
Vol 14 (8) ◽  
pp. 1037-1045 ◽  
Author(s):  
Fei Zhao ◽  
Gang Zhao ◽  
Gaspare Lo Curto ◽  
Hui-Juan Wang ◽  
Yu-Juan Liu ◽  
...  
Keyword(s):  
Line Profile ◽  
Profile Analysis ◽  
Frequency Comb ◽  
Laser Frequency ◽  
Line Profile Analysis

scholarly journals Traceability of laser frequency/wavelength calibration through the frequency comb at Inmetro

2016 ◽  
Vol 733 ◽  
pp. 012058 ◽  
Author(s):  
I L M Silva ◽  
I B Couceiro ◽  
M A C Torres ◽  
P A Costa ◽  
H P H Grieneisen
Keyword(s):  
Frequency Comb ◽  
Laser Frequency ◽  
Wavelength Calibration

Design of Swimming Pool Temperature Dot Matrix Screen Display

2014 ◽  
Vol 556-562 ◽  
pp. 2208-2211
Author(s):  
Xue Feng Yang
Keyword(s):  
Water Temperature ◽  
Real Time ◽  
Room Temperature ◽  
Detection Method ◽  
Swimming Pool ◽  
Real Time Monitoring ◽  
Real Time Processing ◽  
The Core ◽  
Swimming Pool Water ◽  
Point Detection

According to the need of the real-time monitoring and displaying of the environment in many areas,to put forward a method of temperature monitoring and displaying, using STC11F32XE microcontroller as the core controller, DS18B20 as temperature acquisition chip, 32X64LED dot matrix screen as a display screen,using the mothod of multi point detection method,real-time monitoring of swimming pool water temperature and room temperature, real-time displaying of Multipoint collecting information, Real time processing the detected temperature, the page display to multipoint temperature display through the wireless remote control module,the system will alarm When the water temperature is too high or too low, to remind managers of real-time processing.To design a clear temperature display for the swimming pool,real time monitoring and controlling is very convenient,after the experimental verification, the system reaches the anticipative goal,the system is an ideal and effective.

scholarly journals Self referenced Yb-fiber-laser frequency comb using a dispersion micromanaged tapered holey fiber

2007 ◽  
Vol 15 (19) ◽  
pp. 12161 ◽  
Author(s):  
Parama Pal ◽  
Wayne H. Knox ◽  
Ingmar Hartl ◽  
Martin E. Fermann
Keyword(s):  
Fiber Laser ◽  
Frequency Comb ◽  
Laser Frequency ◽  
Holey Fiber

Y-coupled THz Quantum Cascade Laser Frequency Comb

2021 ◽  
Author(s):  
Urban Senica ◽  
Tudor Olariu ◽  
Paolo Micheletti ◽  
Mattias Beck ◽  
Jérôme Faist ◽  
...  
Keyword(s):  
Quantum Cascade Laser ◽  
Frequency Comb ◽  
Laser Frequency ◽  
Quantum Cascade

Modified Posicast Control Design Method Based on the Parameters of a Fractional Order System

2021 ◽  
Vol 143 (4) ◽  
Author(s):  
Erhan Yumuk ◽  
Müjde Güzelkaya ◽  
İbrahim Eksin
Keyword(s):  
Real Time ◽  
Fractional Order ◽  
Control Method ◽  
Design Method ◽  
Order System ◽  
Half Cycle ◽  
Empirical Formulas ◽  
Real Time System ◽  
Novel Design ◽  
Better Than

Abstract In this study, a novel design method for half-cycle and modified posicast controller structures is proposed for a class of the fractional order systems. In this method, all required design variable values, namely, the input step magnitudes and their application times are obtained as functions of fractional system parameters. Moreover, empirical formulas are obtained for the overshoot values of the compensated system with half-cycle and modified posicast controllers designed utilizing this method. The proposed design methodology has been tested via simulations and ball balancing real-time system. It is observed that the derived formulas are in coherence with outcomes of the simulation and real-time application. Furthermore, the performance of modified posicast controller designed using proposed method is much better than other posicast control method.

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