Experiment: Elevator - Revision history

Sebastian Kuhlen at 19:35, 15 June 2017

2017-06-15T19:35:21Z

Sebastian Kuhlen at 10:51, 24 February 2017

2017-02-24T10:51:02Z

Sebastian Kuhlen at 10:49, 24 February 2017

2017-02-24T10:49:23Z

Sebastian Kuhlen at 10:33, 24 February 2017

2017-02-24T10:33:20Z

Sebastian Kuhlen at 10:20, 24 February 2017

2017-02-24T10:20:28Z

Sebastian Kuhlen: Created page with "{{Infobox Experiment | Name = Elevator | Category = Everyday life | Sensors = Pressure }} The experiment "Elevator" determines the speed of an elevator by tracking the cha..."

2016-09-01T19:02:34Z

Created page with "{{Infobox Experiment | Name = Elevator | Category = Everyday life | Sensors = Pressure }} The experiment "Elevator" determines the speed of an elevator by tracking the cha..."

New page

{{Infobox Experiment
| Name = Elevator
| Category = Everyday life
| Sensors = Pressure
}}

The experiment "Elevator" determines the speed of an elevator by tracking the changes in atmospheric pressure.

==Requirements==
There are no requirements, but the results tend to be nicer if the elevator covers at least three floors.

==Setup==

There is no specific setup. Just enter an elevator and start the experiment

==Analysis==

The pressure sensor is extremely precise and designed to determine the user's vertical position. phyphox will take the first reading from this sensor as zero elevation and use the barometric formula to subsequently derive changes in height. As it does only need relative changes, no reference pressure is used, but an average value at sea level ("international barometric height formula"), which is sufficient to determine relative changes at ground level (absolute heights are more problematic).

The speed of the elevator is just the first derivative of the height data over time.

==Problems and resolutions==

* There is a significant rise/fall in the data just at the beginning of the experiment while the elevator is not even moving. This happens for many pressure sensors when turning them on at a different atmospheric pressure then the last time they were in use. Often, the change in atmospheric pressure due to the weather is enough for this to happen, if you have not used this sensor for a few hours. Some sensors may show some delay befor giving first data to cover up this effect, but it may still be visible. However, you can simply stop the experiment, clear the data and start over as it should not happen the second time. If you want to be sure that your measurement succeeds on the first try (for example if you had to wait in line for a special elevator or a theme park ride), just start and stop the experiment once before starting the actual measurement to avoid this effect.

[[Category:Built-in experiments]]

← Older revision		Revision as of 19:35, 15 June 2017
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	* There is a significant rise/fall in the data just at the beginning of the experiment while the elevator is not even moving. This happens for many pressure sensors when turning them on at a different atmospheric pressure then the last time they were in use. Often, the change in atmospheric pressure due to the weather is enough for this to happen, if you have not used this sensor for a few hours. Some sensors may show some delay befor giving first data to cover up this effect, but it may still be visible. However, you can simply stop the experiment, clear the data and start over as it should not happen the second time. If you want to be sure that your measurement succeeds on the first try (for example if you had to wait in line for a special elevator or a theme park ride), just start and stop the experiment once before starting the actual measurement to avoid this effect.		* There is a significant rise/fall in the data just at the beginning of the experiment while the elevator is not even moving. This happens for many pressure sensors when turning them on at a different atmospheric pressure then the last time they were in use. Often, the change in atmospheric pressure due to the weather is enough for this to happen, if you have not used this sensor for a few hours. Some sensors may show some delay befor giving first data to cover up this effect, but it may still be visible. However, you can simply stop the experiment, clear the data and start over as it should not happen the second time. If you want to be sure that your measurement succeeds on the first try (for example if you had to wait in line for a special elevator or a theme park ride), just start and stop the experiment once before starting the actual measurement to avoid this effect.

		+
		+	==Demonstration video==
		+	* [https://youtu.be/y-goBtfuXAM English version on youtube]
		+	* [https://youtu.be/Jgzym7tplVU German version on youtube]

	[[Category:Built-in experiments]]		[[Category:Built-in experiments]]

@@ Line 5: / Line 5: @@
 }}
-The experiment "Elevator" determines the speed of an elevator by tracking the changes in atmospheric pressure.
+The experiment "Elevator" determines the speed of an elevator by tracking the changes in atmospheric pressure. It shows the distance, velocity and acceleration (the latter one from the accelerometer).
 [[File:3 elevator.mp4 |thumb |400px |Example of an elevator over 5 floors. ]]

@@ Line 7: / Line 7: @@
 The experiment "Elevator" determines the speed of an elevator by tracking the changes in atmospheric pressure.
-[[File:3 elevator.mp4 |thumb | right |200px |Example of an elevator over 5 floors. ]]
+[[File:3 elevator.mp4 |thumb |400px |Example of an elevator over 5 floors. ]]
 ==Requirements==

@@ Line 7: / Line 7: @@
 The experiment "Elevator" determines the speed of an elevator by tracking the changes in atmospheric pressure.
-[[File:3 elevator.mp4 | thumb | 200px |alt=Example of an elevator over 5 floors.]]
+[[File:3 elevator.mp4 |thumb | right |200px |Example of an elevator over 5 floors. ]]
 ==Requirements==

← Older revision		Revision as of 10:20, 24 February 2017
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	The experiment "Elevator" determines the speed of an elevator by tracking the changes in atmospheric pressure.		The experiment "Elevator" determines the speed of an elevator by tracking the changes in atmospheric pressure.
		+
		+	[[File:3 elevator.mp4 \| thumb \| 200px \|alt=Example of an elevator over 5 floors.]]

	==Requirements==		==Requirements==