Application and Technical Analysis of Haze Light Transmission Meter in the Detection of Transparent and Translucent Materials

Abstract
In the production and quality control of transparent and translucent materials such as plastics, films, glass, and LCD panels, color consistency, haze, and light transmittance are core indicators for measuring product performance. Traditional testing equipment often suffers from limitations such as single function, complex operation, and insufficient data accuracy, making it difficult to meet the demand for one-stop measurement. This paper takes the LISUN HM-700 Haze Light Transmission Meter as the research object, and combines its technical parameters, functional characteristics, and application scenarios to conduct a detailed analysis of the core advantages of this equipment in the detection of transparent and translucent materials. By interpreting the equipment’s standard compliance, measurement accuracy, operational convenience, and scenario adaptability, this paper expounds its practical value in multiple industries, providing technical references for enterprises to improve product quality control efficiency and reduce testing costs.

1. Introduction
Transparent and translucent materials are widely used in fields such as packaging, electronics, construction materials, and displays. Their optical properties directly affect the product’s appearance, user experience, and functional stability. For example, excessively high haze of food packaging films will affect the visibility of the contents; color deviation of LCD panels will lead to distorted display effects; and insufficient light transmittance of automotive glass may affect driving safety. Therefore, accurate detection of parameters such as color, haze, and spectral transmittance of these materials is a key link for enterprises to ensure product quality and meet market demands.

Under the traditional testing mode, enterprises usually need to use multiple devices such as haze meters and spectrophotometers to measure different parameters separately. This not only increases the cost of equipment procurement but also has problems such as cumbersome testing processes, difficult data integration, and low testing efficiency. As a professional manufacturer of testing instruments, LISUN Group has launched the HM-700 Haze Light Transmission Meter, which innovatively integrates haze measurement, color analysis, and light transmittance detection functions into one, realizing “one-stop” detection of transparent and translucent materials. This paper will comprehensively analyze the technical value and practical significance of this equipment from aspects of its working principle, technical parameters, functional advantages, and application scenarios.

2. Working Principle and Core Functions of the Haze Light Transmission Meter
2.1 Working Principle
The LISUN HM-700 Haze Light Transmission Meter is based on the principle of optical transmission. It realizes the comprehensive measurement of optical parameters of transparent and translucent materials by precisely controlling the light source, optical filters, and detectors. Its working process is mainly divided into three stages: light source emission and modulation, sample transmission and optical signal separation, and signal detection and data calculation.

In the light source emission stage, the equipment selects a specific light source (such as CIE-A, CIE-D65, etc.) according to the measurement requirements, and modulates the light source into a stable parallel light beam through the optical system. In the sample transmission stage, after the light beam passes through the sample to be tested, it is divided into direct light and scattered light. The direct light maintains its original propagation direction, while the scattered light changes direction due to the internal structure of the sample (such as impurities, grain boundaries, surface defects). The equipment separates the two types of light through a dedicated optical component. In the signal detection stage, the detector receives the light intensity signals of direct light and scattered light respectively, and calculates the haze (the ratio of scattered light to total transmitted light), transmittance (the ratio of total transmitted light to incident light), and color parameters (values such as Lab and Luv based on the CIE standard color space) of the sample by combining the preset optical model and algorithm.

2.2 Core Functions
The core functions of the LISUN HM-700 Haze Light Transmission Meter focus on “one-stop measurement, high-precision analysis, and user-friendly operation”, which are specifically reflected in the following four aspects:
• Comprehensive Parameter Measurement Capability: It can simultaneously measure haze, total transmittance, spectral transmittance, and a variety of color parameters. Among them, the color parameters cover dozens of indicators such as Lab, LCh, CIE Luv, XYZ, whiteness (WI), yellowness (YI), platinum-cobalt index (Pt-Co), and Gardner index, meeting the testing needs of different industries for transparent and translucent materials.
• Multi-Standard Compatible Detection System: It strictly complies with authoritative domestic and foreign standards such as ASTM, ISO, GB, and JIS. For example, haze measurement complies with ASTM D1003 and GB/T 2410-08, and color measurement complies with CIE No.15 and ISO 7724/1. This ensures that the test results are universal and recognized, helping enterprises’ products meet the market access requirements of different regions.
• Flexible Light Source and Viewing Angle Configuration: It provides three light source options (CIE-A, CIE-C, CIE-D65) for haze measurement, adapting to lighting conditions in different scenarios. For color measurement, it offers 24 types of light sources (such as D50, D65, F1-F12, etc.) and two observation angles (10°/2°), which can simulate color perception effects in different usage environments and accurately evaluate the “metamerism” phenomenon.
• Intelligent Data Management and Operation: Equipped with a 7-inch Android-based capacitive touch screen, it supports intuitive touch operation. It comes standard with the “Haze QC” data analysis and management software for PC, which can realize data storage (supporting 20,000 values), curve plotting (spectral transmittance curve), report generation, and printing, greatly improving the management efficiency of test data.

3. Technical Parameters and Advantages of the LISUN HM-700 Haze Light Transmission Meter
3.1 Detailed Technical Parameters
The technical parameters of the LISUN HM-700 Haze Light Transmission Meter directly determine its detection accuracy and application range. The core parameters are shown in Table 1. From the parameters, this equipment performs well in wavelength coverage, repeatability, and sample adaptability. Especially, the haze measurement repeatability (≤0.05%) and transmittance resolution (0.01%) reach a high level in the industry, which can meet the demand for high-precision detection.
Table 1 Core Technical Parameters of LISUN HM-700 Haze Light Transmission Meter

Parameter Category	Parameter Name	Parameter Specification
Light Source Configuration	Haze/Transmittance Light Source	CIE-A, CIE-C, CIE-D65
	Color Measurement Light Source	A, C, D50, D55, D65, D75, F1-F12, CMF, U30, DLF, NBF, TL83, TL84 (24 types in total)
Compliance Standards	Detection Standards	ASTM D1003/D1044, ISO13468/ISO14782, JIS K 7105, GB/T 2410-08, CIE No.15, etc.
Measurement Parameters	Optical Parameters	Haze (HAZE), Total Transmittance (T), Spectral Transmittance
	Color Parameters	CIE Lab, LCh, CIE Luv, XYZ, Yxy, Hunter Lab, CMYK, Whiteness, Yellowness, Platinum-Cobalt Index, etc.
Optical Performance	Wavelength Range	400-700nm (visible light range)
	Wavelength Interval	10nm
	Optical Path Structure	0/d (Vertical Illumination, Diffuse Reflection Reception)
	Illumination/Sample Aperture	16.5mm/21mm
Accuracy and Repeatability	Measurement Range	0-100% (Transmittance/Haze)
	Resolution	0.01 unit
	Repeatability	Haze ≤0.05% when haze <10%; Haze ≤0.1% when haze ≥10%; Light transmittance ≤0.1%
Sample Adaptability	Sample Thickness	≤145mm
	Sample Placement Method	Open sample chamber, supporting horizontal/vertical measurement
Operation and Storage	Display Screen	7-inch capacitive touch screen
	Data Storage Capacity	20,000 values
	Interface	USB interface (for connecting to PC/printer)
Environment and Power	Operating Temperature/Humidity	0~45℃, relative humidity ≤80% (at 35℃, no condensation)
	Storage Temperature/Humidity	-25℃~55℃, relative humidity ≤80% (at 35℃, no condensation)
	Operating Power Supply	AC 220V (with power cord included)
Standard and Optional Accessories	Standard Accessories	PC management software (Haze QC)
	Optional Accessories	Measuring fixtures, haze standard plates, 5mm/7mm/10mm aperture plates, 40×10 cuvettes

3.2 Core Technical Advantages
Compared with traditional single-function testing equipment, the LISUN HM-700 Haze Light Transmission Meter has the following four core technical advantages:
• High-Precision Detection Capability: It adopts a compensation measurement technology, which can correct the influence of factors such as ambient light and sample placement deviation on the test results. The haze measurement repeatability is up to 0.05%, and the transmittance resolution is 0.01%, ensuring the accuracy and stability of the data. It is especially suitable for scenarios with strict requirements on optical parameters, such as high-end display panels (LCD, OLED).
• Strong Scenario Adaptability: The open sample chamber design breaks the limitation of traditional equipment on sample size, supporting horizontal or vertical measurement of samples with a thickness of ≤145mm. At the same time, it provides a variety of optional fixtures (such as liquid cuvettes, aperture plates of different sizes), which can be adapted to transparent and translucent samples of various forms, including sheets (plastic plates, glass), films, and liquids (coatings, resins).
• Convenient and Efficient Operation: The Android-based touch screen simplifies the operation process, allowing operators to get started quickly without professional training. The “one-stop” measurement function avoids sample transfer and parameter calibration between multiple devices, shortening the single test time by more than 50% and greatly improving the detection efficiency on the production line.
• Intelligent Data Management: The PC software supports spectral curve comparison, historical data traceability, and custom generation of test reports. It can be directly connected to the enterprise’s MES (Manufacturing Execution System) to realize real-time upload and analysis of test data, helping enterprises build a digital quality control system.

4. Application Scenarios of the LISUN HM-700 Haze Light Transmission Meter
With its full-function measurement, high precision, and strong adaptability, the LISUN HM-700 Haze Light Transmission Meter is widely used in industries such as plastics, films, glass, and electronic displays. The specific application scenarios are as follows:
• Industry: It is used for haze and color detection of plastic sheets/pipes such as PVC, PET, and PC. For example, food-contact plastic containers need to pass haze detection to ensure that the transparency meets food safety standards; colored plastic parts need to control the color consistency between batches through color parameters (such as Lab, color difference ΔE*ab) to avoid “excessive color difference” problems.
• Film Industry: It is used for transmittance and haze detection of packaging films (such as BOPP films, PE films). High-transparency packaging films need to have a transmittance of more than 90% and a haze of less than 3% to ensure that the contents are clearly visible. This equipment can quickly detect the optical parameters of the film, helping enterprises optimize the production process (such as extrusion temperature, stretching speed) and improve the transparency of the film.
• Glass Industry: It is suitable for transmittance and haze testing of automotive glass, architectural glass, and optical glass. The visible light transmittance of automotive front windshields must comply with national mandatory standards (such as GB 9656-2021 requiring ≥70%). This equipment can accurately measure the total transmittance and spectral transmittance of glass to ensure that the optical performance of the glass meets the standards. At the same time, it can detect the color deviation of the glass to avoid uneven coloring of the glass affecting the appearance.
• Electronic Display Industry: It is used for color and haze detection of LCD panels, touch screens, and OLED cover glass. The color parameters (such as white balance, color gamut) of LCD panels need to strictly match the design standards. Through 24 types of light sources and multi-angle configuration, this equipment can simulate the display effect in different usage environments and accurately evaluate the color consistency of the panel. Excessively high haze of the touch screen cover glass will affect the touch sensitivity and display clarity. The equipment can realize high-precision haze detection to ensure the user experience of the product.
• Coating and Chemical Industry: It is used for color and transmittance detection of liquid samples such as transparent coatings, resins, and adhesives. For example, automotive clear coats need to control the degree of yellowing after aging through color measurement (such as yellowness YI). Equipped with a 40×10 cuvette, this equipment can directly measure the optical parameters of liquid samples, providing data support for product formula optimization.

5. Conclusion
The optical performance detection of transparent and translucent materials is a key link in product quality control, but the functional limitations of traditional testing equipment have been difficult to meet the needs of high efficiency and precision in modern industry. The LISUN HM-700 Haze Light Transmission Meter effectively solves the pain points of the traditional detection mode through “one-stop” measurement design, multi-standard compatibility, high-precision detection, and intelligent operation, providing an efficient and reliable detection solution for industries such as plastics, films, glass, and electronic displays.

From a technical perspective, this equipment covers the core optical parameters of transparent and translucent materials, and its measurement accuracy and repeatability reach the advanced level in the industry, which can meet the strict detection needs of different industries. From the perspective of application value, its open sample chamber and rich optional fixtures improve scenario adaptability, and the intelligent data management function helps enterprises build a digital quality control system, reducing testing costs and labor input.

Tags：HM-700