Introduction to Type C Goniophotometry

A Type C Goniophotometer is a precision optical instrument designed to measure the spatial distribution of luminous intensity, luminous flux, and chromaticity characteristics of light sources. Unlike Type A or B Goniophotometer, which rely on single-axis rotation, Type C systems employ a dual-axis (azimuth and elevation) movement mechanism, enabling comprehensive photometric analysis across a hemispherical or full-sphere geometry. This configuration is particularly advantageous for evaluating omnidirectional light sources, including LED luminaires, OLED panels, and complex optical systems.

The LSG-6000, a high-performance Type C goniophotometer developed by LISUN, exemplifies the technological advancements in photometric testing. Its design adheres to international standards such as IEC 60598-1, LM-79, CIE 70, and EN 13032-1, ensuring compliance with global lighting industry requirements.

Technische Daten des Goniophotometers LSG-6000

The LSG-6000 is engineered for high-precision measurements, incorporating a robust mechanical structure, advanced photodetectors, and automated control systems. Key specifications include:

The system’s high angular resolution and wide dynamic range make it suitable for testing both low-intensity medical lighting and high-power urban luminaires.

Testprinzipien und -methodik

The LSG-6000 operates on the fundamental principle of far-field photometry, where the detector maintains a fixed distance from the light source while the goniometer rotates the sample along two orthogonal axes. This ensures that the inverse-square law is preserved, allowing for accurate luminous intensity distribution (LID) measurements.

Key Measurement Modes

1. Luminous Intensity Distribution (LID):

   • Captures angular intensity variations to generate polar candela plots.
   • Essential for beam angle characterization in automotive and stage lighting.

2. Total Luminous Flux (TLF):

   • Integrates intensity data over a 4π steradian sphere for omnidirectional sources.
   • Validates compliance with ANSI/IES LM-79 for LED efficacy.

3. Colorimetric Analysis:

   • Measures correlated color temperature (CCT), color rendering index (CRI), and chromaticity coordinates (CIE 1931/1976).
   • Critical for OLED display uniformity and medical lighting applications.

4. Zonal Lumen Calculation:

   • Segregates flux into angular zones (e.g., 0-30°, 30-60°, 60-90°) for architectural lighting design.

Industry Applications and Compliance Standards

1. Lighting Industry & LED/OLED Manufacturing

The LSG-6000 is widely used in LED module testing, ensuring compliance with IEC 62612 for self-ballasted LED lamps. Its ability to measure near-field and far-field distributions aids in optimizing secondary optics for uniform illumination.

2. Display Equipment Testing

Für OLED and micro-LED displays, the system evaluates angular color shift and luminance uniformity per IEC 62341-6-1, ensuring consistent viewing experiences.

3. Photovoltaic Industry

In solar simulators and PV module testing, the goniophotometer verifies spatial irradiance homogeneity, aligning with IEC 60904-9 Anforderungen.

4. Urban Lighting Design

Municipalities rely on the LSG-6000 to assess streetlight glare and light trespass, adhering to CIE 150:2017 guidelines for obtrusive light reduction.

5. Medical Lighting Equipment

Surgical and diagnostic lighting must meet ISO 15004-2 for photobiological safety. The LSG-6000’s spectroradiometric capabilities ensure compliance.

Wettbewerbsvorteile des LSG-6000

1. High-Speed Data Acquisition:

   • The integrated CCD spectrometer reduces measurement time by 40% compared to traditional scanning systems.

2. Einhaltung mehrerer Normen:

   • Unterstützt DIN 5032-7 (Germany), JIS C 8156 (Japan), and ANSI C78.377 (USA), facilitating global market access.

3. Automated Workflow:

   • Pre-programmed test sequences minimize operator intervention, reducing human error.

4. Modularer Aufbau:

   • Optional darkroom extensions and temperature-controlled chambers accommodate specialized testing environments.

FAQ-Abschnitt

Q1: What is the difference between Type A, B, and C goniophotometers?
Type A rotates the detector around a fixed source, Type B rotates the source on one axis, and Type C (LSG-6000) employs dual-axis rotation for full-sphere analysis.

Q2: Can the LSG-6000 measure UV or IR emissions?
Yes, with optional extended-range detectors (250 nm – 2500 nm), it supports UV/IR radiometric testing.

Q3: How does the LSG-6000 ensure measurement traceability?
It is calibrated against NIST-traceable reference standards, with uncertainty budgets documented per ISO/IEC 17025.

Q4: What software features are included?
The system includes 3D luminous intensity visualization, automated report generation, and real-time data logging.

Q5: Is the LSG-6000 suitable for high-bay industrial luminaires?
Yes, its 50 kg payload capacity accommodates large fixtures, and the 5-meter measurement distance ensures far-field accuracy.