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

Test and evaluate a linear position sensor, and identify a possible use for this sensor in every day life.

Extracts from this document...


Outline For my experiment, I chose to test and evaluate a linear position sensor, and identify a possible use for this sensor in every day life. The experiment was done using a variety of apparatus, as seen in the list below, and was set up as shown in the diagram which follows. Apparatus: Retort stand with two clamps 100g, 20g, and 10g weights with holder Piece of string Sensor Precautions and Safety Safety was not a big issue when doing this experiment, as no harmful materials or apparatus were used. However, some precautions were taken. I made sure that I had enough space to carry out my experiment effectively, without worrying about knocking anything over; and when applying the weights to the sensor's mechanical contact, I made sure to this gently, and not drop the weights on, which could damage the sensor. Procedure After gathering and setting up my apparatus, the circuit was connected using a pair of connecting wires, a few crocodile clips, a power source, multimeter, and of course the position sensor. In this sensor, the exact circuit set up is not known, however there are two possibilities, both of which are shown in the two diagrams which follow. ...read more.


300 2.48 2.53 250 3.56 3.60 200 4.95 4.95 150 4.95 4.95 100 4.95 4.95 Analysis From the results you can clearly see that increasing the amount of mass applied to the mechanical contact, that is, the force applied to the mechanical contact, decreases the output P.D or voltage. As the mechanical contact experiences a force, it is pushed inwards, which consequently reduces the resistance of the sensor's variable resistor. This therefore, in accordance with V= IR, produces a smaller output P.D or voltage. This type of circuit is known as a potential divider circuit, where the sensor's resistance changes in response to the environment, (in this case an applied force) and so the proportion of the P.D across the sensor changes, which is used to give an output P.D or voltage. From the results we see that the maximum output P.D, is 4.95 V. This then means that at this point, the P.D across the fixed resistor (if first circuit) would be 0.05 V. During the experiment, some anomalies were experienced. When carrying out the experiment by starting with a maximum weight and decreasing gradually, there was unusually low output P.D readings recorded, for the 950g- 850g masses. ...read more.


This then also relates to the sensitivity of the sensor, as gradual minor changes may not be detected as that itself, but rather as a big jump when it reaches a certain point. Conclusion From this experiment we can see that using a linear position sensor in a potential divider circuit gives an output P.D or voltage, relative to the changes in resistance, in response to the environment. An increase in the force applied to the sensor's mechanical contact is associated with a decrease in the resistance of the sensor, and so the output P.D or voltage also decreases. In light of this experiment, and other background research of this sensor, I believe that a contact linear position sensor would be ideal for automotive applications. This is because there needs to be a constant track of the positions of the engine compartments, especially the movement of the engine's cylinders and pistons, and this sensor is protected against an engine compartment environment, (such as high temperatures), which can be harsh. It is also cost-effective, with a long endurance life, and can be 'tailored' and configured to fit the customer's needs or specifications. Here is a picture of the linear position sensor used in my experiment By: Scott de Silvia ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our GCSE Systems and Control 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 GCSE Systems and Control essays

  1. Water level sensor

    all the time, so I should collect the data after a bit while waiting until the float stop moving any more. Tables & Graphs 1st try Water/ml Voltage cross the sensor (v) Voltage cross the resistor (v) 0 1.74 4.15 100 2.04 3.85 200 2.25 3.64 300 2.58 3.31 400

  2. The aim of this investigation is to design, build and test a sensor.

    Wooden Metre Rule with mm Scale - easy to measure a large range of distances and does not expand like metal or plastic rulers when exposed to heat * Scissors - to cut open the top and sides of the box so that it is easier to manoeuvre around the

  1. Use a sensor to make a measurement.

    The process is continued until the LDR is totally covered. All readings are tabulated in a table as shown below: Measured lux (in lux) Mean lux (in lux) Voltage reading (in V) Mean voltage (in V) Explanation When bright light falls on the LDR, its resistance falls.

  2. The aim of my project is to produce a working 'People Counter', which will ...

    1 1 1 2 0 0 1 0 0 1 0 3 0 0 0 0 1 1 0 4 1 0 0 1 1 0 0 5 0 1 0 0 1 0 0 6 0 1 0 0 0 0 0 7 0 0 0 1 1 1

  1. An electronics firm wishes to introduce a range burglar alarms. This coursework contains the ...

    Alpha building and testing manual and multi-meter. 20 min. The buzzer was soldered in upside down. Solder the reverse switch components in place 10 min. Soldering iron, stand, pliers, cutters. Heat mat and solder. 5 min. None Test the correct working of the reverse switch 10 min.

  2. Design and build an electrical toy for children aged 5 years and over.

    fails to sell well and is sold to James Brunot who changed the name to Scrabble. The sales averaged just 8,000 but from 1953 to 1955 it suddenly takes off and sales reach 4.5 million sets. 1949 - Leeds-based Waddington's produced a mystery board game.

  1. Calibrating a Potentiometer sensor.

    the readings, which will allow me to plot them accurately on a graph and come up with the calibration curve. The range needs to large enough so any anomalous results will not drastically affect my curve and small enough to be able to be done in the allocated amount of time.

  2. Linear position sensor and Mass.

    Output V a fraction of input V I already know that as the mass increases the output voltage will become higher Factors about the sensor: Resistance 5K? linear Linearity 2% Temp. Coefficient 0 to 200ppm/?C Output smoothness 0.5% max Operating Temp.

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