• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

Physics - Sensor Project

Extracts from this document...

Introduction

Jayan Solanki

Physics Coursework

Sensor Project

Introduction

I shall be undertaking a individual instrumentation project, in my project I shall be building and testing a sensor - exploring the characteristics of a sensor and it to design and assembling a system to allow a sensor to make a measurement.

For my task of building and testing a sensor I shall be adapting the problem of not knowing the level of water in your Cold Water Tank or in Toilets in housing and offices. When building my sensor I shall be following a specification that I shall construct to allow me to stick to my idea and not to begin design things that do not apply to my idea.

When testing my sensor I shall have be limited to using school appliance and equipment therefore I shall simply fill sink or a bucket up with water, clamp my sensor with my construction of the ability to measure the water level, then slowly I shall reduce the amount of water to test the sensor for its sensitivity.

For my sensor I shall also have to use mechanical objects to allow my sensor to work in its environment, such as gearing ratios to allow the ball on the water level to go up and down.

...read more.

Middle

image10.pngimage05.pngimage12.pngimage11.pngimage06.pngimage00.pngimage03.pngimage10.pngimage04.pngimage12.pngimage00.pngimage01.pngimage13.png

Potentiometer diagram...

image19.png

http://sub.allaboutcircuits.com/images/05112.png

Materials

  1. 4x AA 1.5V Batteries + Battery Holder
  1. 1x Coloured 5V LED 1.5mm.
  1. 1x 1K Resistor.
  1. 1x 1K Rotary Potentiometer.
  1. 2x Voltmeter.

Method

To begin my practical side of my project I firstly need to measure the resistance of the resistors in my circuit by using a Ammeter and connecting it in parallel with the fixed resistor first and set the meter to 2k Ohms, it should read 0.96 or higher, it shall be lower than the provided data with the resistor due to the resistance of the wire in the resistor. Following this I shall be following the same stages that you need for measuring the resistance of the fixed resistor for the variable one (rotary potentiometer) by connecting the meter in parallel with the resistor connecting the middle and the left or right connector to the suitable ports to measure resistance.

For my circuit to work in classroom conditions I shall calibrate my sensor by connecting a LED as a indicator to view if the circuit is operating and if it is it should dim as the resistance increases on the variable resistor. Although to measure the resistance as it changes I shall connect the voltmeter in parallel to the variable resistor.

...read more.

Conclusion

Also wires tend to be fray with excessive use, before using the cables I checked each cable of any danger of fray wires which could result in a cut or scratch on me.

Evaluation

My instrumentation project went according to the plan and method I had written. Also my predication that I wrote about my experiment was correct as the intensity of the light decreased as the resistance of the rotary potentiometer increased when turning it 10o c clockwise.

I feel I could have improved my project by attempting to reduce the internal resistance of the wires and semi conductors in the circuit, to resolve this the only option I would have is to change the wires to a better conductor such as Gold or Platinum, although due to being limited to the school equipment I had no choice in using standard copper wire. Also I could have increased the surface area of the components for connecting in the circuit to once again   reduce any short or loose connection to enable the P.D to travel through the ions more freely.

Also in my experiment I could have made it more of a fair test by carrying out my practical experiment by repeating the experiment 3 or 5 times then finding the average from the results that I collected from calibrating of the sensor.

...read more.

This student written piece of work is one of many that can be found in our AS and A Level Modern Physics section.

Found what you're looking for?

  • Start learning 29% faster today
  • 150,000+ documents available
  • Just £6.99 a month

Not the one? Search for your essay title...
  • Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

See related essaysSee related essays

Related AS and A Level Modern Physics essays

  1. Using an LDR to detect the intensity of plane polarised light allowed through a ...

    I was careful to stop this happening, however, by taking each reading in succession, then restarting, thereby taking the 0o reading both early, mid- and late afternoon to eliminate possible discrepancies, among other reasons. Random Variation What is random variation?

  2. Physics - Rotary Potentiometer

    Another item to take in consideration is how accurate the calibration is, after the experiment I intend to use 100g weights to repeat the experiment and compare to see the difference in voltage readings. This will enable to me to see how accurate and consistent the readings are.

  1. Characteristics of Ohmic and non-Ohmic Conductors.

    Thermistor: In Semi-conductors, as voltage increases, the energy in the semi-conductor is used to liberate more electrons. If there are more electrons free to move, this may outweigh the effect due to the vibrating atoms, and thus the flow of electrons, or the current, will increase. Thus the resistance decreases.

  2. Sensors Project Report

    The circuit will be set up with other variable resister will have the lowest resistance to make the sensor more sensitive so that it can be accurate and experiment will all be done on the same day to get sensible results.

  1. Making, Calibrating and Testing a Sensor

    In my experiment for selecting a resistor with the maximum range of sensitivity, many different resistors will be used, in conjunction with an LDR. I will then connect the LDR to a multimeter which will measure the voltage across it.

  2. Sensors cwk. The aim of this coursework is to construct a potential divider circuit ...

    Preliminary Experiment: Carrying out a preliminary experiment can be very useful and this is why it was essential that I carried one. In the preliminary experiment I constructed a potentiometer which could be used to measure the rainfall over a given time.

  1. physics sensor coursework

    Including 0 lux and in increasing intervals of ten lux, I will record the voltage output up to and including 60 lux. For each light intensity, I will take two readings. The equipment involved in this investigation includes; * Power supply - To supply power to the lamp and to the sensor circuit.

  2. Practical Project (2863/02): The Characteristics of a Shunt Wound Motor

    The angular velocity can be measured by using a stroboscope, which determines how many turns the motor makes per second. Method of Choice I have chosen to use Method 2, because it is much more practical to carry out, in that I don't need to go and find a tall building and mark the wall all the way up.

  • Over 160,000 pieces
    of student written work
  • Annotated by
    experienced teachers
  • Ideas and feedback to
    improve your own work