High-precision fiber-optic temperature sensor based on Fabry-Perot interferometer with reflective thin-film multilayer structures
Annotation
An embodiment of a fiber-optic temperature sensor based on a Fabry-Perot interferometer and a scheme for interrogating an experimental sample of the sensor are proposed. The proposed solution makes it possible not to use expensive spectral measuring devices (spectrum analyzer, interrogator). The region of free dispersion and the phase sensitivity of the developed Fabry-Perot interferometer were determined in the temperature range from 20 °C to 590 °C. The accuracy of measuring the ambient temperature is calculated. The long-term stability of the measuring setup at room temperature has been evaluated. The phase shift of the Fabry-Perot interferometer with temperature change was registered. The design of the Fabry-Perot interferometer is implemented using reflective thin-film multilayer structures obtained by stage-by-stage electron-beam deposition in vacuum on polished end cleavages of an optical fiber. The interferometer interrogation method is based on the use of a vertical-cavity surface-emitting laser (VCSEL) operating in a pulsed mode. The principle of registering the phase shift of the interferometer with a change in temperature is based on the use of auxiliary modulation of laser radiation along the wavelength due to modulation (periodic change) of the duration of optical pulses. Auxiliary modulation makes it possible to obtain additional harmonic components in the interferometer signal, which are further used in homodyne demodulation to restore the interferometer phase shift signal proportional to the change in the optical path difference between the interferometer mirrors. The design of the high-temperature sensor is based on a Fabry-Perot interferometer the reflecting mirrors of which are five alternating layers of thin films of TiO2 and Al2O3. Based on the results of the temperature experiment, it was concluded that an increase in the ambient temperature leads to a decrease in the free dispersion region of the Fabry-Perot interferometer. The conclusion made is consistent with the theoretical data. According to the results of the experiment, it is shown that the phase sensitivity of the interferometer to temperature changes is 0.94 rad/K. The accuracy of temperature measurements at the 3σ level was 0.017 K. The results of the study may be of great importance in creating systems for monitoring temperatures above 300 °C. The use of such an interferometer makes it possible to carry out high-precision relative temperature measurements.
Keywords
Постоянный URL
Articles in current issue
- Methods for audiovisual recognition of people in masks
- Influence of the ratio of the intensities of the reference and object waves on the intensity distribution in the holographic field
- Optical system design method for the concentration of radiation from a high-power LED
- Detection of potholes on road surfaces using photogrammetry and remote sensing methods
- Adaptive control of nonlinear plant with unmatched parametric uncertainties and input saturation
- Application of failure detection methods to detect information attacks on the control system
- DC motor fault detection and isolation scheme with the use of directional residual set
- Synthesis and implementation of λ-approach of slide control in heat-consumption system
- Photocatalytic properties of Ag-AgBr nanostructures in ion-exchanged layers of bromide sodium-zinc-aluminosilicate glass matrix
- Mechanization of pomset languages in the Coq proof assistant for the specification of weak memory models
- Cloud-based intelligent monitoring system to implement mask violation detection and alert simulation
- Efficient incremental hash chain with probabilistic filter-based method to updateblockchain light nodes
- Method for generating masks on face images and systems for their recognition
- Improving sign language processing via few-shot machine learning
- Quantum-probabilistic SVD: complex-valued factorization of matrix data
- Modelling of basic Indonesian Sign Language translator based on Raspberry Pi technology
- A method of multimodal machine sign language translation for natural human-computer interaction
- Web app for quick evaluation of subjective answers using natural language processing
- Substantiation of construction and evaluation ways of the application efficiency for spatially distributed system of information sensors to provide environment monitoring
- Monitoring of infiltration processes in hydraulic structures using distributed acoustic sensing technology
- Slotted waveguide antenna design for maritime radar system