Microoptoelectromechanical acceleration transducer based on a roughly-accurate method of Fabry-Perot interferometer signal processing

2020 ◽  
pp. 34-41
Author(s):  
V. I. Busurin ◽  
V. V. Korobkov ◽  
K. A. Korobkov ◽  
N. A. Koshevarova
Keyword(s):  
Sensitive Element ◽  
Fractional Part ◽  
Accurate Method ◽  
Processing Method ◽  
Navigation Systems ◽  
Optical Signals ◽  
Acceleration Transducer ◽  
Fabry Perot ◽  
Measurement Results ◽  
Low Sensitivity

The use of microelectromechanical acceleration transducers is actual in control and navigation systems of aircraft. A microelectromechanical acceleration transducer with an optical reading unit based on a two-channel Fabry-Perot interferometer is considered. Proposed to analyze fractional part of the interference pattern’s fringe to improve the accuracy of the transducer. Changes in the output signal of the optical reading unit under the action of linear accelerations at various parameters of the beamtype sensitive element and change in the interferometer’s transmission at different reflectivity of the mirrors are investigated. The conditions for switching between two channels for bypassing zones with low sensitivity are determined according to the dependences of the interferometer transmission on displacement. A method for processing optical signals has been developed, which forms the output value by concatenating rough measurement results and the calculated accurate component. The proposed processing method makes it possible to increase the accuracy of the acceleration measurements without changing the conversion range.

scholarly journals Two-Parameter Elliptical Fitting Method for Short-Cavity Fiber Fabry–Perot Sensor Interrogation

Sensors ◽  
2018 ◽  
Vol 19 (1) ◽  
pp. 36 ◽  
Author(s):  
Xiongxing Zhang ◽  
Wei Wang ◽  
Haibin Chen ◽  
Ying Tang ◽  
Zhibo Ma ◽  
...  
Keyword(s):  
White Light ◽  
Cavity Length ◽  
Processing Method ◽  
Light Sources ◽  
Fitting Method ◽  
Data Processing Method ◽  
Fabry Perot ◽  
Gap Sensors ◽  
Two Parameter ◽  
Better Than

To solve the cavity interrogation problem of short cavity fiber Fabry–Perot sensors in white light spectral interrogation with amplified spontaneous emissions (ASEs) as the white light sources, a data processing method, using an improved elliptical fitting equation with only two undetermined coefficients, is proposed. Based on the method, the cavity length of a fiber Fabry–Perot sensor without a complete reflection spectrum period in the frequency domain can be interrogated with relatively high resolution. Extrinsic fiber Fabry–Perot air-gap sensors with cavity lengths less than 30 μm are used to experimentally verify the method, and are successfully interrogated with an accuracy better than 0.55%.

scholarly journals Frequency and temperature control for complex system engineering in optoelectronics and electronics: an overview

2020 ◽  
Vol 11 ◽  
pp. 7 ◽  
Author(s):  
Patrice Salzenstein
Keyword(s):  
Complex System ◽  
Temperature Control ◽  
Frequency Stability ◽  
Optical Components ◽  
Optical Signals ◽  
Microwave Oscillators ◽  
Measurement Results ◽  
Physical Principles ◽  
Control Complex

To take advantage of the physical principles of determining parameters, such as frequency stability, noise and also alignment of optical signals, it is necessary to control complex systems. This work allows explaining it through various concrete cases such as the determination of phase noise of microwave oscillators, the control of the temperature of the manufacturing process of optical components. We also discuss the estimation of the uncertainty associated with the measurement results, as it is fundamental to control the error range.

Improved Esterification of Mecoprop for Sensitive Detection on Capillary Gas Chromatography with Mass Selective and Electron Capture Detection

1994 ◽  
Vol 77 (5) ◽  
pp. 1077-1083
Author(s):  
Arthur S Lee ◽  
Moo-Ki Hong ◽  
Albert E Smith
Keyword(s):  
Gas Chromatography ◽  
Electron Capture ◽  
Accurate Method ◽  
Worker Safety ◽  
High Rate ◽  
Electron Capture Detection ◽  
Soil Leachate ◽  
Pentafluorobenzyl Bromide ◽  
Low Sensitivity ◽  
Capillary Column Gas Chromatography

Abstract Analytical methods for determination of the derivatives of the herbicide mecoprop, (±)-2-(4-chloro-2-methylphenoxy)propionic acid (MCPP), by capillary column gas chromatography with mass selective detection (GC-MSD) and electron capture detection (GC-ECD) were studied. A successful procedure was introduced for the ester preparation using H2SO4 as the catalyst and the alcohols 2,2,2-trichloroethanol (TCE) or 2,2,2-tri-fluoroethanol (TFE). The identification and elucidation of MCPP by GC-MSD following the esterifica-tion with diazomethane, BF3-methanol, H2SO4-methanol, TCE, TFE, or pentafluorobenzyl bromide (PFB) were carried out. A comparison of the response sensitivities among those MCPP esters was made with GC-ECD. Although the methyla-tion product of MCPP was confirmed with GC-MSD, its low sensitivity to the ECD limited the detection of MCPP. TCE, TFE, and PFB derivatiza-tion methods resulted in a high rate of MCPP esteri-fications and very sensitive ECD molecular responses. On the basis of efficiency, convenience, worker safety, and least sample contamination, TFE esterification was considered as the superior method for MCPP analysis compared with the other methods of derivatization. An accurate method is described for quantifying MCPP in soil leachates by GC-ECD at very low concentrations without the requirement of a complicated cleanup process. As a result, MCPP residues at concentrations of less than 0.1 μg in 100 mL soil leachate were detected.

scholarly journals Enhancement of UV Excited Photoluminescence by Fabry-Perot Microcavity

2015 ◽  
Vol 2015 ◽  
pp. 1-6
Author(s):  
Chunxian Tao ◽  
Jun Ruan ◽  
Dong Liang ◽  
Zhaoxia Han ◽  
Liang He ◽  
...  
Keyword(s):  
Uv Light ◽  
Resonant Cavity ◽  
Fluorescence Emission ◽  
Light Emitting ◽  
Dielectric Mirror ◽  
Fabry Perot ◽  
Measurement Results ◽  
Phosphor Coating ◽  
Uv Visible ◽  
Higher Sensitivity

A light-emitting microcavity with the structure of dielectric mirror/phosphor coating/dielectric mirror for the enhancement of PL efficiency excited under UV light was designed and fabricated. The fluorescence emission of Lumogen S0795 coating within microcavity structure is significantly enhanced compared with the coating on bare substrate. The measurement results indicate the possibility of developing front illuminated CCD based on optical resonant cavity for UV-visible imaging with higher sensitivity.

scholarly journals Novel scotoma detection method using time required for fixation to the random targets

2021 ◽  
Author(s):  
Nobuyuki Takahashi ◽  
Shozo Saeki ◽  
Minoru Kawahara ◽  
Hirohisa Aman ◽  
Eri Nakano ◽  
...  
Keyword(s):  
Detection Method ◽  
Detection System ◽  
False Negative ◽  
False Negative Rate ◽  
The Novel ◽  
Point Distribution ◽  
Humphrey Perimetry ◽  
Measurement Results ◽  
Low Sensitivity ◽  
Time Required

We developed a novel scotoma detection system using time required for fixation to the random targets, or the "eye-guided scotoma detection method". In order to verify the "eye-guided scotoma detection method", we measured 78 eyes of 40 subjects, and examined the measurement results in comparison with the results of measurement by Humphrey perimetry. The results were as follows: (1) Mariotte scotomas were detected in 100\% of the eyes tested; (2) The false-negative rate (the percentage of cases where a scotoma was evaluated as a non-scotoma) was less than 10\%; (3) The positive point distribution in the low-sensitivity eyes was well matched. These findings suggested that the novel scotoma detection method in the current study will pave the way for the realization of mass screening to detect pathological scotoma earlier.

scholarly journals THE APPLICATION OF METHODS OF ROBUST M-ESTIMATION IN ESTABLISHING SHIP POSITION IN MARINE TRAFFIC SURVEILLANCE SYSTEMS BASED ON RADAR OBSERVATIONS

2013 ◽  
Vol 20 (1) ◽  
pp. 127-147 ◽  
Author(s):  
Sławomir Świerczyński ◽  
Krzysztof Czaplewski
Keyword(s):  
Estimation Methods ◽  
Surveillance Systems ◽  
Navigation Systems ◽  
Traffic Surveillance ◽  
Human Errors ◽  
Navigation Data ◽  
Marine Traffic ◽  
Simultaneous Acquisition ◽  
Measurement Results ◽  
M Estimation

ABSTRACT In the last years considerable emphasis has been placed on safety at sea. There is the maritime security and surveillance system whose main aim is to execute tasks in the interests of maritime safety and to react in case of emergency. They are monitored by networks of radar stations. On such areas we obtain a lot of navigation data which could be used to improve ship’s parameters (position), using know in geodesy modern M-estimation methods. Simultaneous acquisition of navigational information from many independent radar stations will render it possible to obtain a more accurate ship position in marine traffic surveillance systems in relation to the calculated position. A position expected in an adjustment calculus is received from a watch officer. It is burdened with a fallacy of navigation systems and the quality of marking ship’s route on a map. In the case of navigational-parameter measurements used for depicting ship position, one can obtain incorrect results due to a disturbance in the measurement process. In extreme cases, such erroneous data could significantly differ from the anticipated results. Deviating observations could significantly influence the values of measurement results. In order to eliminate the determination of erroneous measurements, one could use resistant estimation methods with suitably selected attenuation functions. The accuracy of a determined position will not be better than the capabilities of the device used. Adjustment gives the possibility of eliminating or minimizing human errors as well as the errors in the indications of navigational devices. This paper presents the latest robust estimation methods using Danish attenuation function for adjustment of navigational observation, using radar observation.

Sign in / Sign up

Export Citation Format

Share Document