Spectrometer-Based Transmittance Measurement Solutions

2025-12-12

From everyday eyeglass lenses to advanced optical sensors, material transmittance is a key performance indicator. Spectrometer-based transmittance measurement solutions, with their precise measurement capabilities, have become essential tools across various industries.

Principles of Transmittance Measurement

When light strikes a material, it can be reflected, absorbed, or transmitted. Different materials transmit light of varying wavelengths differently based on their intrinsic properties. In transmittance measurements, materials like glass and optical filters are categorized as transparent or semi-transparent. Colorless transparent materials, for instance, allow most light to pass through. To quantify this property, transmittance is defined as: Transmittance (T) = (Transmitted Light Intensity / Incident Light Intensity) × 100%

Core Components of the Solution

Spectrometer: Taking the Optosky ATP2000P spectrometer as an example, its advantages include a broad spectral range (200-1100nm), high resolution (0.1-2nm), excellent stability, fast response (up to 4K fps in ultra-high-speed versions), and flexible integration.
Light Source: Commonly used sources include stable deuterium-halogen combi lamps, such as the Optosky ATG1020. These typically require a 10-minute warm-up period to ensure optimal and stable output.

Optical Fiber: Enable flexible transmission of light signals, expanding potential measurement scenarios.

Transmittance Integrating Sphere Holder: Constructed from special materials to diffuse transmitted light uniformly, ensuring stable and reliable measurements. Features strong interface compatibility for easy setup.

Measurement Workflow

System Setup: Connect all components using optical fibers. Connect the spectrometer to a computer and launch the control software. Power on the light source.
Calibration: First, measure and record a dark background spectrum (with the light source off). Then, measure a reference spectrum (with no sample in place). This step eliminates system noise and baseline drift.
Sample Measurement: Place the sample securely in the holder. The spectrometer software automatically performs the measurement, calculates the transmittance, and generates a transmittance curve.

Application Areas

Optical Material R&D and Production: Aids in the research and optimization of material properties. Enables rapid quality inspection during manufacturing to ensure product consistency.
Solar Photovoltaic Industry: Helps optimize components to improve energy conversion efficiency. Facilitates the detection and screening of substandard products. Assists in the maintenance of solar power stations.
Biomedical Field: Supports disease diagnosis through optical methods. Used for quality control testing of medical optical components, ensuring the reliable performance of healthcare devices.