Abstract
Transparent and translucent materials such as plastic sheets, films, glass, LCD panels, and touch screens play a critical role in industries ranging from electronics to packaging. Their optical properties, including color, haze, spectral transmittance, and total transmittance, directly determine product quality and performance. Traditional measurement methods often require multiple instruments, leading to inefficiencies and inconsistencies. This paper introduces a comprehensive one-stop solution for haze and transmittance measurement using the LISUN HM-700 Haze Meter and Spectrophotometer (Transmittance). It details the instrument’s capabilities in integrating color, haze, spectral transmittance, and total transmittance measurements, highlights its compliance with international standards, and demonstrates its applications across various materials. The HM-700’s technical specifications, operational advantages, and real-world utility are analyzed to illustrate its role in streamlining optical property evaluation.
1. Introduction
In modern manufacturing, the optical performance of transparent and translucent materials is a key quality indicator. For example, plastic films used in food packaging require precise haze control to ensure clarity; glass for automotive windshields demands high total transmittance for safety; LCD panels and touch screens rely on consistent color parameters to guarantee display accuracy. Haze and transmittance measurement, along with color analysis, are therefore essential steps in quality control.
Haze refers to the percentage of transmitted light that is scattered by more than 2.5° from the incident beam, affecting a material’s clarity. Transmittance, including total transmittance and spectral transmittance, measures the proportion of light passing through a material, critical for applications like optical lenses and display technologies. Color parameters (e.g., Lab, yellowness index) further define visual appearance, especially for consumer-facing products.
Traditional approaches often separate these measurements: using a haze meter for haze and total transmittance, a spectrophotometer for spectral transmittance and color, and additional tools for specific indices (e.g., yellowness). This fragmentation increases operational complexity, raises costs, and introduces errors from inconsistent sample handling. A unified solution for haze and transmittance measurement, combined with color analysis, is thus necessary to enhance efficiency and data reliability. The LISUN HM-700 addresses this need by integrating all key measurements into a single instrument.
HM-700 Haze Meter and Spectrophotometer(Transmittance)
2. The LISUN HM-700: A Comprehensive Measurement Platform
The LISUN HM-700 Haze Meter and Spectrophotometer is specifically designed for transparent and translucent materials, offering a one-stop solution for color, haze, spectral transmittance, and total transmittance measurement. Its design prioritizes versatility, accuracy, and compliance with global standards, making it suitable for diverse industrial applications.
2.1 Core Functions and Measured Parameters
The HM-700 excels in measuring a wide range of optical parameters, eliminating the need for multiple devices. Its core capabilities include:
• Haze and Transmittance Measurement: It accurately measures haze (HAZE) and total transmittance (T) across a range of 0-100%, with a resolution of 0.01 unit. Spectral transmittance is measured over a wavelength range of 400-700nm (10nm interval), aligning with the visible light spectrum critical for human perception.
• Comprehensive Color Parameters: The instrument quantifies dozens of color indices, including:
• Color spaces: CIE Lab, LCh, Luv, XYZ, Yxy, Hunter Lab, CMYK;
• Whiteness indices: WI (CIE, Ganz, Hunter, Taube, Berger, AATCC, ASTM E313-73);
• Yellowness indices: YI (ASTM D1925, ASTM E313-00/73);
• Other indices: Gardner, Pt-Co/APHA/Hazen colors, tint (CIE, E313, Ganz), and color differences (ΔEab, ΔE00, etc.).
This breadth ensures that users can evaluate both functional (e.g., transmittance) and aesthetic (e.g., color consistency) properties in one measurement cycle.
2.2 Compliance with International Standards
Reliable haze and transmittance measurement requires adherence to globally recognized standards to ensure data comparability across industries and regions. The HM-700 complies with a comprehensive set of standards, including:
• ASTM: D1003 (haze and luminous transmittance), D1044 (abrasion resistance), E1164 (spectrometric data for color), E313 (whiteness/yellowness indices), D1925 (plastic yellowness);
• ISO: 13468 (total luminous transmittance), 14782 (haze), 7724-1 (colorimetry);
• JIS: K7105, K7361, K7163 (plastic optical properties), Z8722 (color measurement conditions);
• Others: GB/T 2410-08 (Chinese standard for haze), CIE No.15 (colorimetry), DIN 5033-7 (object color measurement).
This compliance ensures that measurements from the HM-700 are accepted globally, facilitating international trade and quality benchmarking.
2.3 Technical Advantages Enhancing Measurement Accuracy
The HM-700 incorporates several design features to optimize haze and transmittance measurement accuracy and user experience:
• Multi-Source Illumination: It offers flexible light source selection, including A (incandescent), C (average daylight), and D65 (daylight) for haze and transmittance, plus 24 light sources for color measurement (e.g., F1-F12, D50, D55). This accommodates different application requirements—for example, D65 simulates natural daylight, critical for evaluating display materials.
• Compensation Measurement: The instrument supports transmittance compensation measurement, minimizing errors from environmental factors (e.g., ambient light) or sample thickness variations, ensuring precise results even for non-uniform materials.
• User-Friendly Interface: Equipped with a 7-inch Android touch screen, the HM-700 simplifies parameter setup, measurement initiation, and data review. Its software allows customizing displayed parameters (e.g., adding Lab, removing dE*ab) and generating reports via PC-connected Haze QC software, streamlining data analysis and documentation.
• Flexible Sample Handling: The open measurement area accommodates samples of varying sizes, with horizontal or vertical measurement options. This versatility suits materials from thin films to thick glass sheets, eliminating the need for custom fixtures in most cases (optional fixtures are available for specialized samples).
3. Technical Specifications of LISUN HM-700
Parameter
Specification
Model
HM-700
Measuring Range (Haze/Transmittance)
0-100%
Wavelength Range
400-700nm
Wavelength Interval
10nm
Spectral Response
CIE Y/V(λ) spectrum function
Geometry
0/d (illumination at 0°, detection at diffuse angle)
Illumination Area/Aperture
16.5mm/21mm
Resolution
0.01 unit
Repeatability
Haze https://www.lisungroup.com/news/technology-news/haze-and-transmittance-measurement-a-one-stop-solution-for-optical-property-evaluation-of-transparent-and-translucent-materials-using-lisun-hm-700.html
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