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# aspects of physics

Extracts from this document...

Introduction

Aspects of Physics                                                                                                Page

Aspects of Physics in the Grove leisure Centre

Automatic door system

Pool lighting

Purpose of each one

Automatic door system

The purpose is for the doors to open automatically when anyone is a certain distance from the door. The distance should be right for when they are walking up to the door so it has enough time to open when the person is close enough to go through it.

The automatic door is needed for disabled access as it is a legal requirement. The grove has had them since the year 2000 because legal reasons state that all public places have to have access for disabled people.

It makes it a lot easier for school parties, so the teacher doesn’t have to hold the door so they can make sure the children at the front of the queue are looked after and not left unattended.

Some people who are medically referred to the leisure centre by their doctors might be very weak and wouldn’t be able to open a door, so an automatic door overcomes this problem.

Another helpful thing is that the doors will not be left open in winter time, and therefore will not let heat out, which in turn will save money as the building will not need excess heating because heat is being lost.

Pool Lighting

The lights

Middle

P.I.R.

M

P.M

P.I.R. = Passive Infrared Detector

P.M = Pressure Mat

Logic Gates

The circuit has an OR logic gate in it, this is where either of the two devices will make the doors open.

 INPUT OUTPUT P.I.R. P.M. Automatic Doors 0 0 Doesn’t Open 0 1 Open 1 0 Open 1 1 Open

This table shows that when one of the devices, P.I.R. or P.M. is activated that the automatic doors open. On the left half of the table a 1 represents the device being activated and the 0 represents it not being activated. So either one on its own, or both being activated will result in the doors opening.

Photons

In the crystal there are electrons, and photons are absorbed by the electrons, this is what gives the electrons the energy to move about, and therefore this is what sets up the voltage, and makes the current flow.

Conclusion

Future Developments

In the future the PIR sensor is hoped to be able to recognise individual people as everyone has a different infrared signature. These could be used in situations such as  in a bank where only staff with a infrared frequency that has been registered are allowed into the back room with access to certain information, or in hospitals, only the correct staff will be let into the drugs cupboard. This could also work in football where any hooligans which have been banned from attending certain matches at certain grounds will have there infrared frequency registered with the system so the doors will not open for them. Also in development is a system for when people cross the road, as drivers sometimes ignore pedestrian signs and pedestrians walk across the road without pressing the button. The system is that a P.I.R. will detect a person walking towards the road and will set off a warning such as a light or flashing sign for the driver to see, therefore making them aware of the fact that there is a pedestrian crossing the road which will enable them slow down or stop.

Bibliography

http://en.wikipedia.org/wiki/Wiki

http://www.glolab.com/

http://www.howstuffworks.com/

http://id.mind.net/~zona/mstm/physics/light/rayOptics/reflection/reflection1.html

http://pubsindex.trb.org/document/view/default.asp?lbid=541903

Mark Everitt

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