Search results

1 – 10 of 71
Article
Publication date: 11 June 2019

Ning Jing

This paper aims to propose a liquid level sensor with a multi-S-bend plastic optical fiber.

Abstract

Purpose

This paper aims to propose a liquid level sensor with a multi-S-bend plastic optical fiber.

Design/methodology/approach

The principle of liquid sensing used is based on the leakage of higher modes out of the fiber and repeated regeneration in the following bend sections. Therefore, a propagation loss was introduced in every bend section of the fiber with the loss depending on the refractive index of the environment.

Findings

Therefore, a continue shift in the liquid level can be detected by observing changes in the propagation loss of the fiber. The sensor features compactness and a flexible resolution.

Originality/value

Compared with the exited ones, the sensor has capability of continue liquid measurement and a greater measurement range.

Details

Sensor Review, vol. 39 no. 4
Type: Research Article
ISSN: 0260-2288

Keywords

Article
Publication date: 3 July 2007

James A. Hunt

Examines the wide range of liquid and solid level sensors, their technologies and commercial application.

2081

Abstract

Purpose

Examines the wide range of liquid and solid level sensors, their technologies and commercial application.

Design/methodology/approach

Provides background information on trends in level sensing, on how each type works and the various applications. Some selection criteria are given.

Findings

There is a wide range of level sensors for every target liquid and solid sensing application, but the sector is technologically mature. There are some new application areas deriving from legislation and climate change.

Originality/value

Provides information of value for those involved with sensor applications.

Details

Sensor Review, vol. 27 no. 3
Type: Research Article
ISSN: 0260-2288

Keywords

Content available
Article
Publication date: 1 December 2004

120

Abstract

Details

Sensor Review, vol. 24 no. 4
Type: Research Article
ISSN: 0260-2288

Keywords

Article
Publication date: 31 December 2019

Sathies Thangavel and Senthil Ponnusamy

The purpose of this study is to demonstrate the usage of three-dimensionally (3D) printed polylactic acid (PLA)-carbon black (CB) conductive polymer composite in the…

Abstract

Purpose

The purpose of this study is to demonstrate the usage of three-dimensionally (3D) printed polylactic acid (PLA)-carbon black (CB) conductive polymer composite in the measurement of the void fraction and liquid level.

Design/methodology/approach

PLA-CB conductive polymer composite is 3D printed through fused deposition modelling (FDM) technique and used as a capacitive sensor for void fraction measurement and liquid level sensing. The sensitivity of 3D printed ring and concave type capacitive sensors are compared for void fraction measurement. The effect of electrode length, thickness and pipe dimension on the capacitance achievable for the particular void fraction is studied. Concept of fringing capacitance is used for the sensing of liquid level.

Findings

Compared to the concave design comprising four electrodes, the ring-type capacitive sensor produced better results in void fraction measurement. Increase in pipe diameter and electrode length results in the enhancement of capacitance arising from specific void fraction. For a 100 mm diameter pipe, the capacitance of the 150 mm-long concave electrode (0.4 mm thick) increased from 9.98 to 67.77 pF as the void fraction decreased from 100% to 0%. Development of the fringing capacitance in 3D printed PLA-CB composite helps in the measurement of liquid level. Both parallel finger topology and interdigital electrode configuration are able to sense the liquid level.

Originality/value

Ability of the 3D printed conductive PLA-CB composite to act as a capacitive sensor is experimentally analysed. Performance of different electrode configuration is tested for both void fraction measurement and liquid level sensing. Results of experimentation prove that FDM printed PLA-CB composite is suitable for the void fraction and liquid level measurement.

Details

Sensor Review, vol. 40 no. 1
Type: Research Article
ISSN: 0260-2288

Keywords

Content available
Article
Publication date: 3 July 2007

65

Abstract

Details

Sensor Review, vol. 27 no. 3
Type: Research Article
ISSN: 0260-2288

Article
Publication date: 25 September 2009

Yiqing Wang, Wanhua Zhao, Yucheng Ding, Zhongyun He and Bingheng Lu

The purpose of this paper is to detect and control the liquid‐level of stereolithography apparatus precisely.

Abstract

Purpose

The purpose of this paper is to detect and control the liquid‐level of stereolithography apparatus precisely.

Design/methodology/approach

A brightness‐variable laser source is adopted to remove the computational error of divider and a closed‐loop circuit is set to measure the terminal voltage directly proportional to the output current of photosensitive devices. It employs a sinking‐block device to control the liquid‐level.

Findings

The precise calibration result of this detecting device indicates that the resolution of the liquid‐level detection can reach ±1.5 μm.

Originality/value

This sinking‐block style liquid‐level control device can allow for the liquid‐level wave reduced from ±45 to ±15 μm.

Details

Rapid Prototyping Journal, vol. 15 no. 5
Type: Research Article
ISSN: 1355-2546

Keywords

Article
Publication date: 1 February 1989

D.J. Mobbs and D. Summerhayes

Sensor Review publishes the results of a major sensor survey.

Abstract

Sensor Review publishes the results of a major sensor survey.

Details

Sensor Review, vol. 9 no. 2
Type: Research Article
ISSN: 0260-2288

Article
Publication date: 1 March 1991

Mike Neame

The measurement of level is critical to many manufacturing operations and yet this supposedly straightforward task is full of traps for the unwary.

Abstract

The measurement of level is critical to many manufacturing operations and yet this supposedly straightforward task is full of traps for the unwary.

Details

Sensor Review, vol. 11 no. 3
Type: Research Article
ISSN: 0260-2288

Article
Publication date: 1 January 1989

Peter McGeehin

Optical sensor companies in the UK are getting together to organise their own research and development.

Abstract

Optical sensor companies in the UK are getting together to organise their own research and development.

Details

Sensor Review, vol. 9 no. 1
Type: Research Article
ISSN: 0260-2288

Article
Publication date: 23 May 2018

Wenlong Liu, Yongxing Guo, Li Xiong and Yi Kuang

The purpose of this paper is to present the latest sensing structure designs and principles of information detection of fiber Bragg grating (FBG) displacement sensors

Abstract

Purpose

The purpose of this paper is to present the latest sensing structure designs and principles of information detection of fiber Bragg grating (FBG) displacement sensors. Research advance and the future work in this field have been described, with the background that displacement and deformation measurements are universal and crucial for structural health monitoring.

Design/methodology/approach

This paper analyzes and summarizes the existing FBG displacement sensing technologies from two aspects principle of information detection (wavelength detection, spectral bandwidth detection, light intensity detection, among others) and principle of the sensing elastomer structure design (cantilever beam type, spring type, elastic ring type and other composite structures).

Findings

The current research on developing FBG displacement sensors is mainly focused on the sensing method, the construction and design of the elastic structure and the design of new information detection method. The authors hypothesize that the following research trends will be strengthened in future: temperature compensation technology for FBG displacement sensors based on wavelength detection; a study of more diverse elastic structures; and fiber gratings manufactured with special fibers will greatly improve the performance of sensors.

Originality/value

The latest sensing structure designs and principles of information detection of FBG displacement sensors have been proposed, which could provide important reference for research group.

Details

Sensor Review, vol. 39 no. 1
Type: Research Article
ISSN: 0260-2288

Keywords

1 – 10 of 71