Development of an Optical Temperature Sensor on Liquid Crystals
Keywords:industrial sensors, optical temperature sensors, liquid crystals, phase transitions
Introduction. High-tech production requires careful control of the technological process, the operation of factory equipment, as well as the parameters of work premises, which have to meet the criteria of safety and comfort of employees. For this, there are used sensors of physical parameters, including temperature.
Problem Statement. Inside industrial premises and near factory equipment, special temperature sensors that are not affected by various technological factors, such as high concentration of dust, aerosols of chemical substances, and high noise, shall be employed.
Purpose. The purpose of the research is to illustrate the possibility of creating an optical temperature sensor on liquid crystals, which reliably operates in the conditions of high-tech industrial production.
Material and Methods. Analytical review of scholarly research publications. Experiment, numerical analysis of experimental data.
Results. A design of optical threshold temperature sensor has been proposed. The sensor comprises an optical radiation source that is connected to the input optical pole of the optical switch. The sensor is capable of fixing a number of threshold temperatures that correspond to the phase transition temperatures of each temperaturesensitive element. Composites based on a liquid crystal 6CB doped with magnetic Fe3O4 nanoparticles have been used as heat-sensitive elements. The phase transition temperature of these composites varies from 22 to 29 °C depending on the concentration and size of the Fe3O4 nanoparticles. Due to it, the sensor is able to record threshold temperatures in the range of 22—29 °C with an accuracy of 0.05 °C.
Conclusions. The design of temperature sensor on liquid crystals, which can be used in manufacturing enterprises, in particular, in modern battery production for monitoring temperature conditions inside industrial premises and near technological equipment has been proposed.
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