摘要:

The aim The purpose of the project was to build a spirit level which has two advantages over the conventional, simple, bubbletype device:(a) The user should not have to be above, or even necessarily close to, the level to be able to read it. Indeed it should be possible to have an entirely remote readout.(b) The device should tell the user not only whether a surface is level, but also by precisely how many degrees it is out of level.

ISSN:1754-5692    

DOI:10.1049/ee.1990.0011

出版商:IEE    

年代:1990

数据来源: IET

摘要:

Sometimes you might find it difficult to see the thread on a mercury-glass thermometer. How much more difficult it would be to read if you had poor sight or were even blind. As a project for a oneyear AS course in electronics, I set myself the task of building a thermometer which would work independently of sight.

ISSN:1754-5692    

DOI:10.1049/ee.1990.0012

出版商:IEE    

年代:1990

数据来源: IET

摘要:

Optical fibres are currently finding uses in a great many diverse areas such as communications, lighting, imaging and optical sensors. Basically they provide a means of carrying light between two points via a flexible secure medium. The purpose of this article is to explain how they operate, to show how they fit in with some of the applications mentioned above and finally to describe some simple circuitry and equipment which may be used to investigate the properties of fibres and which could be made the basis of more advanced projects.

ISSN:1754-5692    

DOI:10.1049/ee.1990.0013

出版商:IEE    

年代:1990

数据来源: IET

摘要:

BBC microcomputers can be used for the collection of data from sensing devices such as thermometers and for the control of processes, motion displays etc. Sensors can be used as simple switches as for example lightoperated switches, when the digital inputs of the user port would be appropriate. For situations in which measurements are to be made and perhaps decisions are determined by these measurements, as in temperature sensing for control, the analogue port may be used.

ISSN:1754-5692    

DOI:10.1049/ee.1990.0014

出版商:IEE    

年代:1990

数据来源: IET

ISSN:1754-5692    

DOI:10.1049/ee.1990.0015

出版商:IEE    

年代:1990

数据来源: IET