The research of a frequency-modulated displacement sensor

Tian, Guohui; Chang, Ning; Liao, Jubi; Zhao, Z.X.

doi:10.1016/s0924-4247(97)80071-4

Cited by 17 publications

(4 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As discussed in references [10,11], multi-counters can improve measurement resolution or measurement dynamic responses. The re-investigation of the approach will determine whether it meets the requirements of LAMOST in terms of time drift and in comparison with recent developments of LDC for frequency output.…”

Section: Signal Conditioning and Digitalization Based On Ldc Chipsmentioning

confidence: 99%

“…It was first proposed and invented by professors Zhang and Tian in 1988 [9]. Using multi-differential design (structure, signal conditioning circuit), its performance indicators have reached the sub-micron level, which fully meets the requirements of industrial automation, and has been widely adopted in various equipment developed by Sichuan University (previously known as Chengdu University of Science and Technology) for different industrial fields, e.g., metrology instrument, automobile and pipeline inspection [10,11].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Research on the Time Drift Stability of Differential Inductive Displacement Sensors with Frequency Output

Tian

Wang

et al. 2022

Sensors

Self Cite

View full text Add to dashboard Cite

An edge displacement sensor is one of the key technologies for building large segmented mirror astronomical optical telescopes. A digital interface is one novel approach for sensor technologies, digital transformation and the Internet of Things (IoT) in particular. Frequency output sensors and inductance-to-digital converter (LDC) demonstrated significant advantages in comparison with conventional sensors with analog-to-digital converter (ADC) interfaces. In order for the differential inductive frequency output displacement (DIFOD) sensor to meet the high-stability requirements of segmented mirror astronomical telescopes, it is important to understand the factors for time drift of the sensor. This paper focuses on the investigation of key factors of sensor structure and material, signal conditioning and interface, and fixtures for time drift to permanently installed applications. First, the measurement principle and probe structural characteristics of the sensor are analyzed. Then, two kinds of signal conditioning and digitalization methods using resonance circuits and LDC chips are implemented and compared. Finally, the time drift stability experiments are performed on the sensors with different signal conditioning methods and fixtures under controlled temperature. Experimental results show that the magnetic shield ring effectively improves the sensitivity and quality factor of the sensors, the time drift stability of the sensor using the signal conditioning based on resonance circuits is better than that of the sensors using LDC chips, and the root mean square (RMS) of the sensor time drift meets the requirement of 0.01 μm/24 h. This study will help further development of high-stability of frequency output sensors and IoT-based systems for scaled-up applications in the future.

show abstract

Section: Signal Conditioning and Digitalization Based On Ldc Chipsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Research on the Time Drift Stability of Differential Inductive Displacement Sensors with Frequency Output

Tian

Wang

et al. 2022

Sensors

Self Cite

View full text Add to dashboard Cite

show abstract

“…Even for these sensor types, it was found that the linear range of the sensor strongly depended on the parameters of the mirror(s). Yet another study used an inductive probe and measured oscillation frequencies to achieve a digital value for the displacement of an object [9]. This approach lends itself well to complex measuring systems.…”

Section: Related Work 21 Displacement/gesture Sensorsmentioning

confidence: 99%

3D Projected Imagery Freespace Control Unit (PIFCU): Design, Implementation, and Analysis

Ferguson

Turner

2013

Power and Energy / 807: Intelligent Systems and Control / 808: Technology for Education and Learning

View full text Add to dashboard Cite

A desirable mechanism to control a computer would be to use a multifaceted, three-dimensional interactive display system that provides varying levels of control of an API via a visually bounded freespace containing projected imagery for interactions. This work presents such a system and its proof-of-concept, which includes two components: the 3D Projected Imagery Freespace Control Unit (PIFCU)-the built hardware used to create 3D imagery and function as the system's control unit, and the Gesture-Controlled 3D Interface Freespace (GCIF)-the term used for this "sensorized" volume of space in which the 3D images and gestures will reside. This system is intended to ultimately remove the need for keyboards and similar interface hardware. The hardware of this device consists of an array of linearly adjoining slices of concave mirrored surfaces with openings at the top and bottom. This combination advances related work such that the imagery can be perceived as threedimensional images in free-space, and the computer is controlled using hand gestures recognized by sensors. The benefits to other professions include providing new methods of construction, navigation, gaming, as well as presenting a solution for certain physical limitations that traditional computing experiences currently exert on users (i.e. rigid hand angles for typing).

show abstract

“…The importance of accurate measurement of surface roughness and micro-displacement in engineering applications can rarely be overemphasized. In recent years many techniques for measuring the surface roughness and micro-displacement have been developed [1][2][3][4][5][6][7][8][9]. Most of the reported works employ techniques that evaluate surface roughness and microdisplacement separately.…”

Section: Introductionmentioning

confidence: 99%

Laser integrated measurement of surface roughness and micro-displacement

Wang

Tay

Quan

et al. 2000

Meas. Sci. Technol.

View full text Add to dashboard Cite

An optical method based on laser scattering and optical triangulation for measurement of surface roughness and micro-displacement measurement is proposed. The technique allows evaluation of surface roughness and micro-displacement of a specimen using just one device. The principle of the method and the basic instrumentation design are described and the validity of the principle is demonstrated by experimental evaluations. Results show that, for specimens with surface roughnesses (R a ) in the range 0.005-0.1 µm, displacements in the range ±300 µm can be readily measured.

show abstract

The research of a frequency-modulated displacement sensor

Cited by 17 publications

References 2 publications

Research on the Time Drift Stability of Differential Inductive Displacement Sensors with Frequency Output

Research on the Time Drift Stability of Differential Inductive Displacement Sensors with Frequency Output

3D Projected Imagery Freespace Control Unit (PIFCU): Design, Implementation, and Analysis

Laser integrated measurement of surface roughness and micro-displacement

Contact Info

Product

Resources

About