• Join over 1.2 million students every month
• Accelerate your learning by 29%
• Unlimited access from just £6.99 per month
Page
1. 1
1
2. 2
2
3. 3
3
4. 4
4
5. 5
5
6. 6
6
7. 7
7
8. 8
8
9. 9
9
10. 10
10

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

Extracts from this document...

Introduction

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.

Middle

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.

Conclusion

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

# Related GCSE Systems and Control essays

1. ## Building a mass balance to measure small weights (0g-100g) using a rotary potentiometer

measured using this model but I have decided to use 0 to 100g for convenience. FITNESS FOR PURPOSE Resolution: Mass/g(10.00) Output/V +1.00 2.83 +2.00 2.86 Mass/g(30.00g) Output/V +1.00 3.34 +2.00 3.37 Basically, form the table above we can see that when 1.00g is added to known masses, the output is

2. ## 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

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

* It must be battery powered. Testing reverse switch for back door The proximity detectors worked every time that the door opened more than 10 cm. Test - shadow sensor to detect an intruder moving down a hallway. After adjustment the shadow sensor could detect a persons shadow, with 100% accuracy, up to 1.2 metres away.

2. ## Building a Sensor to Measure Weight, using a Potential Divider and Wheatstone Bridge.

Also I have resolved that placing the weights at the furthest point on the hacksaw blade will increase the leverage on the gauges so they will detect a larger range of strain. To calibrate the circuit I needed to use set amounts of weights; I used weights increasing from 0 g to 1600 g, increasing by 200 g each time.

1. ## Using a Rotary Potentiometer to Detect the Position of a Robotic Arm

Note, to see the mathematics involved in any of the figures I give, see the appendix at the end of this paper. The figures in brackets relates to the subsection in the appendix. In general, I have learnt that a normal rotary resistor is more than adequate for use in most robotic arms.

2. ## Finding the Spring Constant of a Copper Spring Using a Potential Divider

This will stop the spring recoiling and damaging your eyes. 4.5 Fair Test * Length of wire - keep length of wire the constant to make sure this variable doesn't affect the experiment.

1. ## Getting On Line Without a Computer or Internet Access at Home

Library; Bradley Beach Free PL; Bridgeton PL; Brielle PL; Burlington County Library; Burlington, Library Company of; Butler PL. C Caldwell PL; Camden Free PL; Camden County Library; Carlstadt (William E. Demody Free PL); Cape May County Library; Carteret PL; Cedar Grove Public Library; Chathams, Joint Free PL of the; Cherry

2. ## The paper discusses the issues associated with the risks assessed between the organizations bidding ...

investment proposals; different measures such as the net present value, internal rate return, and profitability index were used to evaluate the proposals. The reliability of these measures depends on the cash flow projections for the two organizations. Shang-wa Electronics CEO also looked at the positive potential outcome of a merger with Lester Electronics.

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