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基于液晶盒作为传感元件的温频转换器。

Temperature-frequency converter using a liquid crystal cell as a sensing element.

机构信息

Departamento de Tecnología Electrónica, Universidad Carlos III de Madrid, Madrid, Spain.

出版信息

Sensors (Basel). 2012;12(3):3204-14. doi: 10.3390/s120303204. Epub 2012 Mar 7.

DOI:10.3390/s120303204
PMID:22737002
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC3376606/
Abstract

A new temperature-frequency converter based on the variation of the dielectric permittivity of the Liquid Crystal (LC) material with temperature has been demonstrated. Unlike other temperature sensors based on liquid crystal processing optical signals for determining the temperature, this work presents a system that is able to sense temperature by using only electrical signals. The variation of the dielectric permittivity with temperature is used to modify the capacitance of a plain capacitor using a LC material as non-ideal dielectric. An electric oscillator with an output frequency depending on variable capacitance made of a twisted-nematic (TN) liquid crystal (LC) cell has been built. The output frequency is related to the temperature of LC cell through the equations associated to the oscillator circuit. The experimental results show excellent temperature sensitivity, with a variation of 0.40% of the initial frequency per degree Celsius in the temperature range from -6 °C to 110 °C.

摘要

一种基于液晶（LC）材料介电常数随温度变化的新型温度-频率转换器已经得到演示。与其他基于液晶处理光学信号来确定温度的温度传感器不同，这项工作提出了一种仅使用电信号就能感测温度的系统。介电常数随温度的变化用于通过使用 LC 材料作为非理想介电来修改平板电容器的电容。使用扭曲向列（TN）液晶（LC）盒制成的可变电容的电振荡器已经构建。输出频率与 LC 盒的温度有关，通过与振荡器电路相关联的方程。实验结果表明具有出色的温度灵敏度，在-6°C 至 110°C 的温度范围内，初始频率的变化为每摄氏度 0.40%。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a701/3376606/3dbcaac1baab/sensors-12-03204f9.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a701/3376606/0f83b69c3967/sensors-12-03204f1.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a701/3376606/ba951527dbe9/sensors-12-03204f2.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a701/3376606/8aa579b5d058/sensors-12-03204f3.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a701/3376606/c97e932cc5e0/sensors-12-03204f4.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a701/3376606/07e04dcfbff6/sensors-12-03204f5.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a701/3376606/6ce2b94561a7/sensors-12-03204f6.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a701/3376606/94ac7814bb75/sensors-12-03204f7.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a701/3376606/ac2fe8b46a42/sensors-12-03204f8.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a701/3376606/3dbcaac1baab/sensors-12-03204f9.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a701/3376606/0f83b69c3967/sensors-12-03204f1.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a701/3376606/ba951527dbe9/sensors-12-03204f2.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a701/3376606/8aa579b5d058/sensors-12-03204f3.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a701/3376606/c97e932cc5e0/sensors-12-03204f4.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a701/3376606/07e04dcfbff6/sensors-12-03204f5.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a701/3376606/6ce2b94561a7/sensors-12-03204f6.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a701/3376606/94ac7814bb75/sensors-12-03204f7.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a701/3376606/ac2fe8b46a42/sensors-12-03204f8.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a701/3376606/3dbcaac1baab/sensors-12-03204f9.jpg

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Note: Phase-locked loop with a voltage controlled oscillator based on a liquid crystal cell as variable capacitance.注意：基于液晶盒作为可变电容的压控振荡器的锁相环。
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Adaptive liquid crystal lens with large focal length tunability.
Liq Cryst Rev. 2013;1(1):29-51. doi: 10.1080/21680396.2013.769310.
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A novel high-sensitivity, low-power, liquid crystal temperature sensor.一种新型高灵敏度、低功耗液晶温度传感器。
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具有大焦距可调性的自适应液晶透镜。
Opt Express. 2006 Nov 13;14(23):11292-8. doi: 10.1364/oe.14.011292.