SEISMOACOUSTIC SIGNALS PROCESSING FOR EXTENDING OF THE INFORMATIVITY OF FIBER-OPTICAL SENSITIVE ELEMENTS

2021 ◽  
pp. 117-128
Author(s):  
I. V. Denisov ◽  
A. E. Sonin
Keyword(s):  
Sensitive Element ◽  
Optical Sensing ◽  
Acoustic Signals ◽  
Sensing Element ◽  
Optical Measuring ◽  
Fiber Optical ◽  
Measuring Network ◽  
Acoustic Component

The principles of recording and processing of the combination of seismic and acoustic signals from single intruder by means of the underground fiber-optical sensing element are given in this article. It shows distinctive informative features of the signals. They complement known features in terms of acoustic component. The novelty of the work is combining the processing of seismic and acoustic signals. The interferometric fiber-optical measuring network is used as distributed fiber-optical seismic acoustic sensitive element.

Ternary influences on the fiber-optical measuring network

2007 ◽  
Author(s):  
Igor V. Denisov ◽  
Nelly A. Rybalchenko ◽  
Viktor A. Sedov
Keyword(s):  
Optical Measuring ◽  
Fiber Optical ◽  
Measuring Network

scholarly journals PULSE METHOD FOR DETERMINATION OF TIME PARAMETERS THERMAL FIRE DETECTOR

2021 ◽  
Vol 4 (164) ◽  
pp. 166-170
Author(s):  
Ya. Kozak
Keyword(s):  
Electric Current ◽  
Time Constant ◽  
Sensitive Element ◽  
Integral Transformation ◽  
Pulse Method ◽  
Auxiliary Parameter ◽  
Sensing Element ◽  
Fire Detector ◽  
Time Parameters ◽  
Analytical Expressions

For thermal fire detectors with a thermoresistive sensitive element, the method of determining its time parameters is justified. The time parameters of operation and the time constant of the thermal fire detector are considered as time parameters. The method is based on the use of the Joule-Lenz effect, for the implementation of which single pulses of electric current are passed through the thermoresistive sensitive element of the fire detector. Pulses having the shape of a quarter sinusoid or a quarter cosinusoid are used as such test signals. Using the Laplace integral transformation, analytical expressions are obtained, which represent the formalization of the reaction of the thermoresistive sensitive element of the fire detector to the corresponding test signals. These analytical expressions are used to obtain the functional dependences of the fire detector time constants on the pulse duration of the electric current and the auxiliary parameter. The auxiliary parameter is the ratio of the values ​​of the output signal of the thermal fire detector at two fixed points in time. This choice of auxiliary parameter allows to ensure invariance with respect to the transfer coefficient of the thermal fire detector with a thermoresistive sensing element. The fixed moments of time are chosen to be equal to half and three quarters of the duration of the pulses of electric current flowing through the thermoresistive sensitive element of the fire detector. The time of operation of the thermal fire detector is determined in the form of two additive components, one of which is a time constant of the fire detector, and the other is determined by the values ​​of normalized parameters in accordance with existing regulations. A sequence of procedures is given, which together represent a method of determining the time parameters of thermal fire detectors of this type.

All-fiber optical sensor of electrical current with a SPUN fiber sensing element

2006 ◽  
Author(s):  
V. P. Gubin ◽  
V. A. Isaev ◽  
S. K. Morshnev ◽  
A. I. Sazonov ◽  
N. I. Starostin ◽  
...  
Keyword(s):  
Optical Sensor ◽  
Electrical Current ◽  
Sensing Element ◽  
Fiber Sensing ◽  
Fiber Optical Sensor ◽  
Fiber Optical ◽  
Spun Fiber

Multi-Channel Fiber Optical Sensing System for Urban Bridge Cluster Health Monitoring

2012 ◽  
Vol 557-559 ◽  
pp. 2075-2080
Author(s):  
Yi Li ◽  
Zhong Guo ◽  
Yi Qiang Xiang
Keyword(s):  
Health Monitoring ◽  
Optical Sensing ◽  
Measurement Data ◽  
Traffic Load ◽  
Sensor Data ◽  
Effect Of Temperature ◽  
Seismic Safety ◽  
Sensing System ◽  
Fiber Optical ◽  
Strain Responses

Modern technologies are increasingly facilitating real-time monitoring of urban bridges and transportation networks. The advances in multi-channel fiber optical sensing system for instance, enable practical deployments for large extended bridge structural systems. Sensor data, can be used for long-term condition assessment, traffic-load regulation, emergency response, and seismic safety applications. In this paper, A flexible and scalable urban bridge Cluster Health Monitoring system is being developed and implemented. A typical concrete tied arch bridge was selected to introduce the computer-based automated signal analysis algorithms to process the monitoring data and one-year measurement data obtained from the fiber optical strain and temperature sensors are used for this study. The correlation analysis technique is applied to quantify the effect of temperature on the strain responses. The results show that the linear regression model exhibits good capabilities for mapping the strain responses with temperature.

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