Pohl’s Pendulum Mechanics Lab Experiments

This apparatus is designed for the study of free and forced oscillations, damping effects, resonance phenomena, and phase relationships in vibrating systems. It enables accurate measurement of oscillation parameters and provides practical understanding of resonance characteristics using photoelectric sensing and stroboscopic techniques. Physics Lab Experiments from Atico Exports.

Experiments:

1. Free Oscillation Investigation

• Measure the relationship between balance wheel amplitude (θ) and free oscillation period (T)
• Study the characteristics of free vibration systems
• Analyze oscillatory motion under low damping conditions

2. Damping Factor Determination

• Measure and calculate the damping factor (β)
• Investigate energy dissipation in oscillating systems
• Study the influence of damping on vibration behavior

3. Forced Vibration Characteristics

• Plot amplitude-frequency characteristic curves
• Plot phase-frequency characteristic curves
• Analyze frequency response of forced oscillation systems

4. Resonance Phenomena Study

• Investigate the effect of different damping conditions on forced vibrations
• Observe resonance behavior experimentally
• Determine resonance frequency and maximum amplitude conditions

5. Phase Difference Measurement

• Use the stroboscopic method to determine phase difference
• Compare stroboscopic and metrological measurement techniques
• Analyze phase relationships between driving and driven oscillations

• Free and Forced Oscillation Studies
• Resonance Investigations
• Damping Analysis
• Frequency Response Measurements
• Phase Difference Measurements
• Mechanical Vibrations Education
• Physics Laboratory Training

Spring Constant Stability

• Free Vibration Period Variation: Less than 2%

Time Measurement

• Accuracy: 0.001 s
• Cycle Measurement Error: 0.2%

Mechanical Pendulum

• Indexed Slots with 2° Divisions
• Radius: 100 mm

Amplitude Measurement

• Accuracy: ±1°
• Photoelectric Detection Method

Photoelectric Sensor A

• Double Photoelectric Signal Detection

Photoelectric Sensor B

• Single Photoelectric Signal Detection

Motor Speed (Forcing Frequency)

• Range: 30 – 45 rpm
• Continuously Adjustable

Motor Speed Stability

• Instability: Less than 0.05%

System Damping

• Less than 2° Amplitude Decay Per Cycle

Phase Difference Measurement

• Stroboscopic and Metrological Measurement Methods
• Deviation Between Methods: Less than 3°
• Metrological Measurement Range: 50° to 160°
• Stroboscopic Measurement Range: 0° to 180°
• Repeated Measurement Deviation: Less than 2°

Stroboscopic Flash Unit

• Low-Voltage Operation
• Separate Flash Assembly
• Continuous Flash Duration: 2 ms
• High-Visibility Red Light Source

System Components

• Resonance Experimental Unit
• Experimental Controller
• Separate Stroboscopic Flash Assembly
• Photoelectric Sensor A
• Photoelectric Sensor B

• High-Accuracy Photoelectric Measurement System
• Integrated Data Acquisition and LCD Display
• Adjustable Forcing Frequency with Excellent Stability
• Dual Methods for Phase Difference Measurement
• Separate High-Visibility Stroboscopic Flash Unit
• Low-Noise Operation Suitable for Classroom Demonstrations
• Comprehensive Coverage of Oscillation and Resonance Phenomena

Controller Features

• Dedicated Data Acquisition and Display Controller
• Large Dot-Matrix LCD Display
• Menu-Guided Operation with Experiment Prompts
• Experimental Data Display and Review Function
• Dedicated Strobe Control Interface