International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395 -0056
Volume: 04 Issue: 02 | Feb -2017
p-ISSN: 2395-0072
www.irjet.net
BRIDGE STABILITY MONITORING USING RH SENSORS CONTROLLED BY LABVIEW SOFTWARE KALAIVANI.R1, DHARANI.K.R2, MALLESHBABU.V3, YOGALAKSHMI.K4 1 Asst. 2, 3& 4 Final
Professor, Dept. Of EEE, INFO Institute of Engineering, Tamil Nadu, India. Year Student, Dept. Of EEE, INFO Institute of Engineering, Tamil Nadu, India.
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Abstract - The main aim of our project is to continuously
content of air to the maximum (saturated.) moisture level that the air can hold at a same given temperature and pressure of the gas. RH is a temperature dependent magnitude, and hence it is a relative measurement. The RH measurement is stated as a percentage. Saturation Humidity is defined as the ratio of the mass of water vapour at saturation to the volume of air. RH sensor used here is of capacitive in nature and its construction is like two electrodes separated by a dielectric material. The sensor reads the value when there is a change in capacitance of the electrodes. When the moisture level remains normal or does not change then the sensor output remains to be normal [2].
monitor the concrete structures and give alert based on its condition. RH sensors are placed in the concrete structures and the datas from the sensor are continuously received and given to myRIO hardware where the data is compared, split and stored. While comparing the received data with the reference data if any abnormality or change is observed then alarm gives the alert. This alarm control and monitoring is done using LABVIEW software. This type of monitoring requires less space and accuracy will be more. Thus, it would help in preventing loss of many lives and provide control over concrete structure. This monitoring is common for all the concrete structures. The datas are also stored for future use. Data storage is done in the myRIO hardware. Key Words: RH sensors, Concrete Structures, LabVIEW, myRIO, Alarm
Figure 1.1 represents RH sensor.
1. INTRODUCTION
2.2 Saturation vapours pressure
Nowadays collapsing of concrete structures is becoming common this results in loss of many lives. On analyzing this problem we came to know that loss in lives would have been prevented if there was an alert regarding the condition of the concrete in the bridge. The stability can be analyzed by placing sensors in the bridge. The sensors used may be fiber optic sensor, RH sensor, acoustic touch sensor, etc., [1]. This analysis is done using the NI lab view software and the sensors output is given to the myRIO hardware that helps us to give analogue output. The analogue output is given to the alarm circuit if any deviations were found else it is stored in the memory.
Figure1.2 represents the temperature variation with respect to saturation vapour pressure.
Figure 1.2
2. RH SENSOR RH sensors are relative humidity sensors. These sensors measure both humidity and temperature. There are three different types of humidity they are Absolute humidity Relative humidity Saturation humidity Absolute Humidity (vapour density) is defined as a ratio of the mass of water vapour in air to the volume of air, with the unit of grams per cubic meter or grains per cubic foot. Relative Humidity (RH) is defined as ratio of the amount of moisture © 2017, IRJET
temperature
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Impact Factor value: 5.181
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3. BLOCK DIAGRAM
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