KEYWORDS: Sensors, Electronics, Microcontrollers, Infrared sensors, Infrared radiation, Analog electronics, Power supplies, Standards development, Digital electronics, Data communications
Differential inductive displacement sensors are widely used in hydraulic applications because they offer good accuracy,
large displacement range (up to 200mm) and have a rugged construction. Displacement information is usually extracted with analog electronics techniques - sinusoidal excitation of coils, quadrate modulation and synchronous demodulation – but this method is not well suited for implementation in digital embedded systems. Using a novel method for displacement measurement, based on switching voltages applied to the coils of the inductive device, the displacement sensor can be implemented with a standard microcontroller with integrated analog to digital converter and timer. Commissioning, configuring and data communication can be performed using standard serial interface. To avoid wires and cables, an infrared communication based on a standard IrDA transceiver module can be implemented. Presented paper focuses on measurement and construction aspects of an inductive displacement sensor with infrared
communication interface option implemented and tested by authors.
KEYWORDS: Analog electronics, Microcontrollers, Mechatronics, Switches, Power supplies, Transducers, Multiplexing, Clocks, Neodymium, Data communications
The large scale use of hydropneumatic equipments into fabrication process, combined with the production pursuit informational systems impose complex measurements of parameters must be transmitted to the informational systems. The integration of some mechatronic ensembles into the hydropneumatic equipments, ensembles which allow the measurement and the network transmission of the measurement results through the informational systems, makes an easy way for the production centers to informational improve their fabrication process whit all the benefits implied. The global evolution of embedded systems, combined whit new tips of sensors and measuring methods of hydro pneumatic devices specific physic parameters, allows the tackle of those measuring mechatronic ensembles in partnership whit the European research centers that have the same goals in those fields.
The paper refers to some experimental research activities carried out with a view to accommodate the functional parameters of a laser controlled system with the actual horizontal grading conditions (the slopes in x and y directions of the grading plane are null). Experimental research activities were carried on a device which comprises two electrohydraulic servomechanisms: one mechano-hydraulic servomechanism, which the quota laser sensor is mounted on and simulates the land profile; one electro-hydraulic laser controlled servomechanism, identical with the one on the machinery, which traces the first servomechanism and brings the quota laser sensor back into the optimum reference plane (generated by the rotary laser generator) whenever this one is offset of the laser plane. Experiments were meant to determine: the dynamic of the tracing laser controlled system for various land profiles; the stability and response time of this system; the dynamic of the tracing laser controlled system under simulating external noise comparable with the vibrations generated by the grading machinery.
KEYWORDS: Sensors, Transducers, Electronics, Calibration, Signal processing, Power supplies, Environmental sensing, Temperature metrology, Humidity, Mechanics
The paper describes a systematic approach regarding the development of a linear position and speed transducer used in hydraulic applications. The electronic module of the transducer is integrated into the LVDT sensor body, to obtain an assembly capable to operate into hydraulic specific environment conditions: vibrations, wide range of operating temperature and high humidity with condensation, significant mechanic and hydraulic shocks, important electromagnetic interference with the intense electric current circuits specific for hydraulic equipment a.o. To obtain the functioning and precision performances needed, it was assessed the use of a reduced number of small size electronic components. It was chosen an original solution for excitation and processing of the signal from the sensor that allows the direct connection of the sensor with the microcontroller used into the electronic module of the transducer. The power supply of the transducer was implemented throughout commutation (buck-converter) providing a superior efficiency and reducing the risk of overheating the electronic module by Joule effect. The performances determined by experiment confirms the designing data by meaning to obtain the position indication of 10000 of stabile divisions and the speed indication of 1000 stabile divisions; the process time of the electronic module is 40ms.
This paper presents an electropneumatical system computer assisted for compensate the sag of an optoelectronical detector. This system is used for compensate the sag of a frame of an optoelectronical detector during the fabrication. For push-up group we use pneumatically servocylinders which allowed a very precise control of the sag through force. Each servo cylinder includes a proportional pressure regulator for regulating the pressure proportional to a specified electrical nominal value. The system is controlling by a PC with 2 acquisition board, one of them for monitoring the force of the transducer and the other board for controlling the pressure of the gas in servo cylinders. The software subsystem for developing the tuning numerical algorithm contents WIN 98 operating system, TestPoint rapid application development platform for data acquisition and graphic user software and Delphi rapid application developing platform for real time control algorithm module.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.