Design and evaluation of a single-tube cross-capacitance fuel level sensor

In order to improve the accuracy and reduce the weight of the cross-capacitor fuel level sensor, a novel single-tube cross-capacitor fuel level sensor is designed. Specifically, the fuel level measurement model of the single-tube cross-capacitance sensor is established, and the relationship between the measured liquid level and the sensor output capacitance is derived. Then, a finite element analysis model is constructed to solve the capacitance output of the sensor. The results of experiments conducted demonstrate that the output capacitance value of the designed single-tube cross-capacitive sensor changes linearly in the range 0-14 pF, with linearity ? 0.8%, hysteresis error ? 0.1%, and maximum reference error ?1.0% FS at a liquid level of 120 mm. The optimized structural parameters were as follows: plate gap angle ? = 2?, quartz tube inner radius R0 = 11.5 mm, quartz tube thickness R1 ? R0 = 1.6 mm, and sensitivity = 0.0723 pF/mm (representing an 11.1% increase after optimization). The cross-capacitive fuel level sensor developed in this study is both lightweight and high precision.

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Design and Characteristic Analysis of Cross-Capacitance Fuel-Level Sensor

Sensors ◽

10.3390/s18113984 ◽

2018 ◽

Vol 18 (11) ◽

pp. 3984 ◽

Cited By ~ 2

Author(s):

Jing Yu ◽

Hang Yu ◽

Dongsheng Li

Keyword(s):

Capacitive Sensor ◽

Measurement Model ◽

Liquid Level ◽

Characteristic Analysis ◽

Single Tube ◽

Level Measurement ◽

Repeatability Error ◽

Level Sensor ◽

Fuel Level ◽

Liquid Level Sensor

A cross-capacitance liquid level sensor is based on the principle of cross capacitance. This study designed a new single-tube cross-capacitance fuel-level sensor. The fuel-level measurement model is established for a single-tube cross-capacitive sensor, and the relationship between the measured liquid level and sensor output capacitance is derived. The characteristics of the sensor were tested experimentally. The experimental results demonstrate that the linearity error of the liquid-level sensor of the single-tube calculation for the spacecraft is ±0.48%, the repeatability error is ±0.47%, and the hysteresis error is ±0.68%. The cross-capacitive fuel-level sensor developed in this study can be used in the fuel tank of spacecrafts owing to its low weight and high precision.

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Liquid Level Sensor Based on a V-Groove Structure Plastic Optical Fiber

Sensors ◽

10.3390/s18093111 ◽

2018 ◽

Vol 18 (9) ◽

pp. 3111 ◽

Cited By ~ 14

Author(s):

Chuanxin Teng ◽

Houquan Liu ◽

Hongchang Deng ◽

Shijie Deng ◽

Hongyan Yang ◽

...

Keyword(s):

Optical Fiber ◽

Structural Parameters ◽

High Sensitivity ◽

Cost Effective ◽

Liquid Level ◽

Plastic Optical Fiber ◽

Sensing Applications ◽

Level Sensor ◽

Groove Structure ◽

Liquid Level Sensor

A high sensitivity and easily fabricated liquid level sensor based on the V-groove structure plastic optical fiber (POF) was described. In the design, the V-groove structure on the POF is produced by using a die-press-print method, which effectively reduces the complexity of the fabrication process and makes it easier for mass production of liquid level sensors. This greatly enhances the usefulness of the proposed sensor in cost effective liquid level sensing applications. The transmission characteristic of the POF could be changed when the V-groove structure was immerged or emerged by the rising or falling liquid. The liquid level sensing performances for the sensor probes with different structural parameters were investigated, and the sensor performances for the liquids with different refractive indices and the sensor dynamic response were also tested. Experimental results show that the sensor’s sensitivity can reach 0.0698 mm−1, with a resolution of 2.5 mm. Results also show that the sensor has a fast response time of 920 ms.

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A new interface weak-capacitance detection ASIC of capacitive liquid level sensor in the rocket

Modern Physics Letters B ◽

10.1142/s021798491750302x ◽

2017 ◽

Vol 31 (32) ◽

pp. 1750302 ◽

Cited By ~ 2

Author(s):

Liang Yin ◽

Yao Qin ◽

Xiao-Wei Liu

Keyword(s):

Liquid Level ◽

Cmos Process ◽

Test Results ◽

Zero Position ◽

Output Noise ◽

Capacitance Detection ◽

Level Sensor ◽

The Stability ◽

Liquid Level Sensor ◽

Output Capacitance

A new capacitive liquid level sensing interface weak-capacitance detection ASIC has been designed. This ASIC realized the detection of the output capacitance of the capacitive liquid level sensor, which converts the output capacitance of the capacitive liquid level sensor to voltage. The chip is fabricated in a standard [Formula: see text] CMOS process. The test results show that the linearity of capacitance detection of the ASIC is 0.05%, output noise is [Formula: see text] (when the capacitance which will be detected is 40 pF), the stability of capacitance detection is [Formula: see text] (1[Formula: see text], 1[Formula: see text]h), the output zero position temperature coefficient is 4.5 uV/[Formula: see text]C. The test results prove that this interface ASIC can meet the requirement of high accuracy capacitance detection. Therefore, this interface ASIC can be applied in capacitive liquid level sensing and capacitive humidity sensing field.

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Power-Type Liquid-Level Sensor for High Refractive Index Liquid Based on Long-Period Fiber Grating

Sensors and Actuators A Physical ◽

10.1016/j.sna.2021.112652 ◽

2021 ◽

pp. 112652

Author(s):

Ming Zhang ◽

Zhangjun Hu ◽

Xiao Wang ◽

Linlin Xue ◽

Jun Zou ◽

...

Keyword(s):

Refractive Index ◽

High Refractive Index ◽

Liquid Level ◽

Fiber Grating ◽

Power Type ◽

Long Period Fiber Grating ◽

Long Period ◽

Level Sensor ◽

Period Fiber Grating ◽

Liquid Level Sensor

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Liquid level sensor based on dynamic Fabry–Perot interferometers in processed capillary fiber

Scientific Reports ◽

10.1038/s41598-021-82193-5 ◽

2021 ◽

Vol 11 (1) ◽

Author(s):

Pablo Roldán-Varona ◽

Rosa Ana Pérez-Herrera ◽

Luis Rodríguez-Cobo ◽

Luis Reyes-González ◽

Manuel López-Amo ◽

...

Keyword(s):

Optical Fiber Sensor ◽

Liquid Level ◽

Hollow Core ◽

Immiscible Liquids ◽

Fabry Perot ◽

Detection Mode ◽

Level Sensor ◽

Core Fiber ◽

Liquid Level Sensor ◽

Silica Capillary

AbstractIn this work, a novel optical fiber sensor capable of measuring both the liquid level and its refractive index is designed, manufactured and demonstrated through simulations and experimentally. For this, a silica capillary hollow-core fiber is used. The fiber, with a sensing length of 1.55 mm, has been processed with a femtosecond laser, so that it incorporates four holes in its structure. In this way, the liquid enters the air core, and it is possible to perform the sensing through the Fabry–Perot cavities that the liquid generates. The detection mode is in reflection. With a resolution of 4 μm (liquid level), it is in the state of the art of this type of sensor. The system is designed so that in the future it will be capable of measuring the level of immiscible liquids, that is, liquids that form stratified layers. It can be useful to determine the presence of impurities in tanks.

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Development of non-contact fiber-optic fuel level sensor for automobile fuel tank

10.1063/5.0043582 ◽

2021 ◽

Author(s):

R. S. Laddha ◽

P. B. Buchade ◽

A. D. Shaligram

Keyword(s):

Fiber Optic ◽

Fuel Tank ◽

Level Sensor ◽

Fuel Level

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Light Path Model of Fiber Optic Liquid Level Sensor Considering Residual Liquid Film on the Wall

Journal of Sensors ◽

10.1155/2015/729507 ◽

2015 ◽

Vol 2015 ◽

pp. 1-8

Author(s):

Zhijun Zhang ◽

Shiwei Zhang

Keyword(s):

Liquid Film ◽

Fiber Optic ◽

Glass Tube ◽

Path Model ◽

Liquid Level ◽

Residual Liquid ◽

Light Refraction ◽

Special Cases ◽

Level Sensor ◽

Liquid Level Sensor

The working principle of the refractive-type fiber optic liquid level sensor is analyzed in detail based on the light refraction principle. The optic path models are developed in consideration of common simplification and the residual liquid film on the glass tube wall. The calculating formulae for the model are derived, constraint conditions are obtained, influencing factors are discussed, and the scopes and skills of application are analyzed through instance simulations. The research results are useful in directing the correct usage of the fiber optic liquid level sensor, especially in special cases, such as those involving viscous liquid in the glass tube monitoring.

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