DATA LOGGING

AYU NADIA BT MOHD ZAHIDD2010103753

8

NURSYAKHILA BT ZAHARID2010103752

3NORFAZREEN

A BT MA’AMOR

D20101037526

INFORMATION AND

COMMUNICATION TECHNOLOGY

IN SCIENCESBB3013

• An electronics instrument that record measurement

• Characteristics: the ability to take sensor measurement and store the data

Data logge

r

• The process of using a computer to collect data through sensors, analyze the data and save and output the result of the collection and analysis.

Data loggin

g

COMPONENTS OF DATA LOGGING.

SPEED

OF SOUND..

SPEED OF SOUND

This experiment describes the use of the ADC -212 virtual oscilloscope to measure the speed of sound.

Scientific concept : The speed of sound is the distance travelled during a unit of time by a sound wave propagating through an elastic medium. In common everyday speech, speed of sound refers to the speed of sound waves in air. However, the speed of sound varies from substance to substance. Sound travels faster in liquids and non-porous solids than it does in air. 

ENGAGE

Last weekend, my family and I decided to go to Gua Kelam in Perlis. As we walk through the cave there is a lot of nice things to watch. Then, I notice something interesting, when we talk through the cave, we can hear our voice be reflected. We hear our own voice echo. Why this happened? I also notice the same phenomena when I talk in empty house or when I shout in the tunnel. How can this happen and what is the cause?

EMPOWEREquipment required2 microphones-crystal Mics were used since

they are cheap and give a large output1 metre wooden ruleFast digital storage oscilloscope-the ADC-212

was usedA balloon-to burst for a sudden loud sound

source

Experiment set upThe experiment was set up as shown below

with two crystal microphones placed 1 metre apart

Results :The balloon was burst approximately 2 m away from

the foremost Mic. The plot below shows the results clearly.

The lefthand “BLUE” trace is from the fpremost Mic (Mic 1) and the righthand “red” trace is from mic

( Mic 2)The waveform from Mic 1 between -164µs and 500 s

is clearly visible in the trace from Mic 2 delayed by 2929 µs. There is second variation , in the waveform from Mic 1, around 1.5 ms caused by an echo from one wall or ceiling.

ENHANCETelling how far away a person with a starter’s

gun, at a running race, is by comparing the time difference from when you can see the gun’s smoke to when you hear the sound.

Telling how far away a cliff is by making a sound and measuring how long it takes for the echo to return

Telling where an enemies gun was fired.Telling how far away a lighting strike.

CONCLUSIONThe speed of sound wave refers to how fast the

disturbance is passed from particle to particle. Frequency refers to the number of vibrations that

an individual particle makes per unit of time, speed refers to the distance that the disturbance travels per unit of time. 

Data logging is commonly used in scientific experiments and in monitoring systems where there is the need to collect information faster than a human can possibly collect the information and in cases where accuracy is essential. 

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