Spectroradiometer with Integrating Sphere and Goniophotometer: An Overview
In the field of optical testing, the spectroradiometer with integrating sphere and the goniophotometer are two critically important measurement instruments—indispensable for accurate light source characterization.
Structure and Coating of the Spectroradiometer with Integrating Sphere
The spectroradiometer with integrating sphere—also known as a luminous flux sphere—consists of a hollow, fully enclosed spherical shell. Its interior surface is coated with a white, diffuse-reflecting layer, ensuring uniform diffused illumination across all points on the inner wall. When a light source *S* illuminates any point *B* on the sphere’s inner surface, the illuminance at that point results from the superposition of multiple reflected light components. Key performance indicators for such an instrument include the spectral reflectance *ρ(λ)* of the sphere’s inner coating and the sphere’s effective transmittance *τ(λ)*. Two common types of integrating sphere coatings are employed: one is SPEKTRON™ coating, exhibiting a reflectance *ρ(λ)* of approximately 80% across the 380–780 nm wavelength range; the other is standard barium sulfate (BaSO₄) coating, which also achieves roughly 80% reflectance over the same spectral band. Spectroradiometers with integrating spheres find widespread application in optical fabrication, metrology, materials science, and optomechanical alignment.
Jingyi Optoelectronics’ Spectroradiometer with Integrating Sphere System
Jingyi Optoelectronics’ spectroradiometer-based spectral power measurement system delivers outstanding performance in light source characterization. It utilizes a high-quality PTFE-based integrating sphere with exceptional diffuse reflectance to collect light from sources. Its unique geometric design ensures that laser power measurements remain unaffected by beam polarization or calibration drift, enabling simultaneous acquisition of spectral and power data. Light source power and wavelength are measured separately using a calibrated optical power meter and a fiber-coupled spectrometer, respectively; measurement results are then processed and displayed via dedicated software. For specialized applications requiring adjustable light intensity—such as attenuation control—the system supports integration of neutral-density filters or other attenuation methods. Moreover, the system’s calibration is traceable to the National Institute of Metrology (NIM), thereby guaranteeing the accuracy and reliability of all measurement outcomes.
Functionality and Features of the Goniophotometer
The goniophotometer is primarily used to measure the spatial light distribution of light sources (i.e., luminaires or emitters). When equipped with colorimetric measurement modules, it can further determine total luminous flux, chromaticity coordinates, correlated color temperature (CCT), and other photometric and colorimetric parameters. While offering high measurement accuracy, its acquisition speed is comparatively slow—typically requiring 15–20 minutes per full measurement cycle.
Measurement Advantages of the Spectroradiometer with Integrating Sphere
By contrast, although the spectroradiometer with integrating sphere delivers slightly lower absolute accuracy, it excels in speed: a complete measurement takes only 1–2 seconds. In practical applications, users may select the most appropriate instrument based on their specific requirements—prioritizing either precision or throughput.
Jingyi Optoelectronics’ Products and Industry Contributions
Within today’s rapidly evolving optical industry, Jingyi Optoelectronics consistently upholds principles of innovation and technical excellence, continuously advancing optical measurement technologies. Its flagship products—including the spectroradiometer-based spectral power measurement system—deliver reliable, high-performance solutions for light source characterization across diverse sectors, supporting industrial progress and technological innovation.
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