Physics Lab Equipment

LEMI-37 Comprehensive Experiments on Rotating Liquid

LEMI-37 Comprehensive Experiments on Rotating Liquid

Features

  • Resonable in structure design

  • Stable and reliable experimental data

  • Rich experiment contents




Introduction


The study of rotating fluids provides valuable insights into both the principles of mechanics and optics. By examining the behavior of liquids under rotational forces, we can explore fundamental concepts such as gravity, surface tension, and optical properties. In physics, experiments involving rotating liquids have long been used to understand the relationship between rotational motion and gravitational acceleration.


The LEMI-37 Apparatus offers a hands-on approach to these classic experiments by combining modern sensors and measurement techniques. Using a semiconductor laser to detect surface inclination and a Hall sensor to measure rotational speed, the apparatus accurately reproduces the rotating liquid experiment. The unique parabolic surface formed by the rotating liquid serves as both a tool for studying gravity and an optical element for experiments in light reflection and focusing.


The LEMI-37 Apparatus allows users to perform the following experiments:

1. Measure Gravity Acceleration (g):

Method 1: Measure the height difference between the highest and lowest points of the rotating liquid surface to calculate gravity acceleration.

Method 2: Directly measure the surface slope using a laser beam incident parallel to the rotation axis to derive gravity acceleration.

2. Verify the Relationship Between Focal Length and Rotation Period: Investigate how the parabolic shape of the rotating liquid surface focuses light. Measure the focal length of the surface and verify its relationship to the rotational period of the liquid, based on the parabolic equation.

3. Study Concave Mirror Imaging: Analyze how the rotating liquid surface acts as a concave mirror and explore the behavior of light imaging on the surface. Examine how changes in rotational speed affect the concave mirror’s ability to focus light.


The LEMI-37 Apparatus provides a comprehensive learning experience, allowing students to:

1. Understand the relationship between gravity and rotating fluids by measuring gravity acceleration through multiple methods.

2. Explore the optical properties of a rotating liquid surface, such as its function as a concave mirror and its ability to focus light.

3. Investigate the behavior of rotating fluids and their parabolic surfaces, bridging the gap between theoretical mechanics and practical optical applications.


The instruction manual provides clear experimental configurations and step-by-step instructions for setting up and performing each experiment, detailed explanations of the principles behind rotating liquid experiments, including the derivation of gravity acceleration and the analysis of optical properties, and example results to help students interpret data and validate experimental findings.


For further exploration into the mechanics of rotating fluids and their optical properties, refer to the Experiment Theory and Contents. The LEMI-37 Apparatus of Comprehensive Experiments on Rotating Liquid is an invaluable tool for university-level physics labs, offering a unique blend of mechanics and optics experiments in one comprehensive apparatus.


Specifications

DescriptionSpecifications
Semiconductor laser

2 pcs, power 2 mW 

one spot beam with diameter < 1 mm (adjustable)

one divergent beam

2-D adjustable mount

Cylinder container

colorless transparent plexiglass

height 90 mm

inner diameter 140 ± 2 mm 

Motor

speed adjustable, max speed < 0.45 sec/turn

speed measurement range 0 ~ 9.999 sec, accuracy 0.001 sec

Scale rulers

vertical ruler: length 490 mm, min div 1 mm

horizontal ruler: length 220 mm, min div 1 mm


Parts List

DescriptionQty
Main electric unit1
Rotation stage1
Beam1
Semiconductor laser2 (one spot, one divergent)
2-D adjustable support1
Observation screen
1
Cylinder container1
Bubble level1
Power cord1
Instruction manual1


 LEMI-37-1.jpg

Cross section of rotating liquid surface

LEMI-37-2.jpg

Schematic of measuring gravity acceleration

LEMI-37-3.jpg

Plot of slope and reciprocal of period square 

LEMI-37-4.jpg

Plot of log of focal length and log of period

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