VibroMicro Laser Vibrometer for Frequency Testing

VibroMicro Laser Vibrometer Non-Contact Testing System
——Integrated Non-Contact Excitation Solution for Natural Frequency Testing

Natural frequency testing is fundamental to structural dynamics analysis, especially in high-precision fields like aerospace, biomedical engineering, and MEMS development. The VibroMicro Laser Vibrometer Non-Contact Testing System by Dynatronic combines laser measurement and contactless excitation in a fully integrated platform. This article presents the system’s components, testing principles, and technical advantages for accurate and efficient modal analysis.

1. System Components

1. VibroMicro Laser Vibrometer

• Measurement range: DC–25MHz

• Displacement resolution: 0.001nm

• Supports 1D vibration measurement (X/Y/Z-axis acquisition)

2. Non-Contact Excitation System

• Types: Acoustic/electromagnetic/air-bearing exciters

• Frequency range: DC–10kHz

• Maximum excitation force: 20N (customizable)

3. Intelligent Control Platform

• Frequency sweep range: 0.1Hz–500kHz

• Sweep modes: Linear/logarithmic/custom

• Real-time FFT analysis

2. Testing Principle

A "non-contact excitation & non-contact measurement" closed-loop system:

1. Wideband excitation via acoustic/magnetic fields

2. Real-time structural response capture using laser vibrometer

3. Automatic resonance peak detection (±0.01Hz sensitivity)

4. Frequency Response Function (FRF) curve generation

3. Technical Advantages

Technical advantages

Feature	Traditional Methods	This Solution
Excitation Method	Contact (impact hammer/shaker)	Fully non-contact
Added Mass	Affects modal characteristics	Zero added mass
Applicable Scenarios	Lab environments	Harsh conditions (high temp/vacuum, etc.)

4. Standard Testing Procedure

1. Pre-Test Setup

• Laser positioning (auto-focus accuracy: ±2μm)

• Exciter parameter configuration (frequency/amplitude/sweep rate)

2. Automated Frequency Sweep Test

• Step precision: 0.001Hz

• Maximum sampling rate: 256kHz

3. Modal Analysis

• Automatic identification of first 10 natural frequencies

• Vibration mode animation (4K output supported)

5. Application Cases

Case 1: Surgical Blade Modal Testing

• Test object: Titanium alloy ultrasonic blade (15mm length)

• Results:

• 1st bending mode: 28.5kHz

• 2nd torsional mode: 67.3kHz

• Damping ratio: 0.0021 (ambient air)

Case 2: Precision MEMS Testing

• Achieved 0.1Hz resolution testing on 2mg microstructures

• Identified unexpected 12.7kHz resonance due to design error
  

The VibroMicro Laser Vibrometer Non-Contact Testing System offers a fully integrated solution for high-precision natural frequency testing—eliminating the drawbacks of traditional contact methods. Its ability to excite and measure structures without physical interference enables accurate modal analysis across a wide range of test objects, from delicate surgical blades to micro-scale MEMS components. With high resolution, automated workflows, and robust environmental adaptability, VibroMicro empowers engineers and researchers to confidently validate designs, detect structural anomalies, and ensure optimal performance under real-world conditions.