Research on Intelligent, Convenient and Accurate Benchtop Transmittance Spectrophotometer and Its Application — A Case Study of LISUN DSCD-950P Benchtop Spectrophotometer (Transmittance & Reflectance)

Abstract
With the growing demand for quantitative color detection in industrial production and material laboratories, traditional color measuring instruments suffer from cumbersome operation, insufficient measurement accuracy, and the inability to integrate transmittance and reflectance detection. Taking the LISUN DSCD-950P Benchtop Spectrophotometer (Transmittance & Reflectance) as the research object, this paper centers on the core equipment architecture of the Benchtop Transmittance Spectrophotometer. It analyzes the software and hardware advantages of the instrument equipped with a 7-inch TFT true-color capacitive touch screen, full-spectrum spectroscopic system and Android intelligent operating system. The performance of the equipment is elaborated from three dimensions: high-precision optical light path, intelligent interactive system and multi-scenario adaptability. A table of core parameter data is used to quantify the precision indicators of the instrument, and the application scenarios in industries including plastics, liquids, textiles and printing are sorted out. The study shows that this Benchtop Transmittance Spectrophotometer balances measurement accuracy, operational convenience and intelligence, and can meet standardized color measurement requirements for laboratory color analysis and industrial quality inspection, with high promotion and application value.

1. Introduction
Color serves as a core evaluation indicator for the appearance quality and batch consistency of materials. Manual visual identification produces subjective errors and fails to realize digital and standardized control. As a precision optical testing instrument integrating transmittance and reflectance dual modes, the Benchtop Transmittance Spectrophotometer converts subjective human color perception into objective values such as spectrum, chromaticity and color difference, acting as a core testing instrument for material research and finished product quality inspection.

Most conventional benchtop color measuring instruments on the market adopt key-press display screens and closed operating systems, accompanied by drawbacks such as high operation thresholds, limited sizes of transmittance samples, single detection capacity for fluorescent samples, and manual replacement of multiple apertures. LISUN launches the DSCD-950P Benchtop Spectrophotometer (Transmittance & Reflectance), a new-generation Benchtop Transmittance Spectrophotometer integrated with dual optical path spectral analysis, four-speed ultraviolet detection, automatic aperture identification and Android intelligent touch control system. It realizes integrated transmittance and reflectance detection, compatible with multi-form samples such as large-size films, liquids, solid particles and powders, greatly lowering the operation difficulty of laboratory color measurement while improving long-term measurement stability and data repeatability. This paper systematically analyzes the intelligent design, convenient structure and high-precision optical system of this Benchtop Transmittance Spectrophotometer.

2. Core Intelligent Design of LISUN DSCD-950P Benchtop Transmittance Spectrophotometer
2.1 7-inch Rotatable TFT True-color Capacitive Touch Screen & Android Intelligent Operating System
This Benchtop Transmittance Spectrophotometer is equipped with a rotatable 7-inch TFT true-color capacitive touch screen paired with a deeply customized Android operating system, a core intelligent highlight distinguishing it from traditional embedded key-type color measuring instruments. A dedicated color measurement APP is built in the equipment, whose interaction logic conforms to smartphone operation habits, supporting multi-point touch, page scaling and spectral curve zoom viewing. New operators can independently complete the full process including calibration, measurement, data retrieval and color difference judgment without long-term training.

The system has an 8GB local storage space for mass storage of spectral curves, chromaticity data and color difference reports, and supports switching between more than ten languages (Simplified/Traditional Chinese, English, Japanese, Korean, German, French, etc.) to meet domestic and international laboratory testing standards. A built-in camera realizes sample positioning preview before measurement to avoid data deviation caused by sample displacement. Matched with an automatic temperature and humidity compensation algorithm, it offsets the interference of ambient temperature and humidity fluctuations on spectral signals to achieve stable all-weather detection. The whole machine supports multi-interfaces including RS-232, USB and USB-B for data export, which can connect to professional PC color analysis software to complete batch data export, report generation and color trend analysis, expanding the data management capacity of laboratories.

DSCD-950P_AL

2.2 Full-spectrum Spectroscopic System for Synchronous High-precision Transmittance & Reflectance Detection
As a high-performance Benchtop Transmittance Spectrophotometer, DSCD-950P adopts independent dual optical path structures of transmittance D/0° and reflectance D/8°, matched with a 152mm large-diameter integrating sphere, concave grating spectroscopic components and silicon photodiode array sensors. It covers the complete visible full spectrum of 360nm–780nm with a wavelength interval of 10nm and half bandwidth controlled at 5nm, whose spectral resolution meets the demand of high-precision color traceability.

The instrument applies dual optical path spectral analysis technology to synchronously collect spectral data of samples and internal environmental reference spectra, eliminating systematic errors induced by light source attenuation and stray light interference. It supports separate measurement and rapid synchronous detection of SCI (specular component included) and SCE (specular component excluded). The synchronous measurement time of dual modes is less than 4 seconds, while single-mode measurement takes less than 2 seconds, greatly boosting detection efficiency. Meanwhile, four ultraviolet measurement modes (UV included, 400nm cutoff, 420nm cutoff, 460nm cutoff) are equipped to accurately identify fluorescent whitening components in films, coatings and textile fabrics and solve the problem of distorted color measurement of fluorescent samples.

3. Convenient Structural Design of the Instrument
3.1 Open Transmittance Sample Chamber for Unlimited Large-size Transmittance Samples
Most traditional Benchtop Transmittance Spectrophotometers adopt closed narrow sample slots, only compatible with standard cuvettes and unable to measure wide films and thick plates. The transmittance chamber of DSCD-950P features an open design with no size restrictions on sample width and height, and the maximum supported thickness of transmittance samples is 50mm. Films and thick glass plates can be directly placed for measurement. Standard dual transmittance apertures (Φ17mm/Φ25mm) are provided, and optional accessories including micro transmittance fixture and heating transmittance fixture can be matched to meet special detection scenarios of trace liquids and high-temperature molten samples.

3.2 Automatic Multi-aperture Identification and Integrated Accessory Storage
Four switchable measurement apertures are configured for reflectance measurement (XLAV Φ25.4/30mm, LAV Φ15/18mm, MAV Φ8/11mm, SAV Φ3/6mm). After replacing the aperture, the instrument automatically identifies the optical path specifications without manual parameter setting, adapting to different-sized samples such as large plates, tiny particles, yarns and micro pills. A dedicated accessory drawer is embedded in the machine body to store 15 sets of standard accessories including white calibration plate, black cavity and various aperture plates and cuvettes. It is also compatible with 12 optional accessories (film fixture, fiber test box, pneumatic ejector rod, etc.), enabling one single instrument to cover color measurement demands of all industries. The whole machine supports three measurement postures: side placement, upward placement and downward placement. Matched with a vertical stand, it can realize stable measurement of powders and particles. The damping handle optimizes sample pressing operation and reduces human-induced measurement errors.

4. Precision Performance Indicators of the Instrument (Core Parameter Table)
The table below lists key performance parameters of the LISUN DSCD-950P Benchtop Transmittance Spectrophotometer, intuitively reflecting its measurement precision, stability and compliance:
Table 1 Core Performance Parameters of LISUN DSCD-950P Benchtop Transmittance Spectrophotometer

It can be seen from the parameters that this Benchtop Transmittance Spectrophotometer reaches laboratory benchmark level in core precision indicators including repeatability and inter-instrument agreement. Meanwhile, it balances the universality of transmittance samples and testing speed, reconciling precision and detection efficiency. The instrument has a built-in automatic calibration program, and baseline correction can be completed with matched standard white plate and black cavity. The drift volume after long-term use is low, eliminating frequent factory calibration and reducing laboratory operation and maintenance costs.

5. Multi-industry Application Scenarios of Benchtop Transmittance Spectrophotometer
Equipped with dual transmittance and reflectance modes, DSCD-950P Benchtop Transmittance Spectrophotometer covers full industrial chain color detection scenarios:
• Plastic and Color Masterbatch Industry: Measure plastic plates and color masterbatch particles via reflectance mode, and test transparent plastic films via transmittance mode to control batch color difference, yellowness and haze;
• Petroleum, Grain & Oil Liquid Detection: Matched with cuvettes and micro transmittance fixtures to determine platinum-cobalt index, Gardner color number and light transmittance of edible oil and crude oil;
• Powder Coatings and Inorganic Powders: Equipped with powder test boxes to test color difference, hiding power and tinting strength of powders via reflectance mode;
• Textile Yarn and Fabric: Measure color fastness to staining and color fastness to change of fabrics, and distinguish differences of fluorescent whitening agents on fabrics;
• Packaging & Printing Industry: Detect transparent packaging films via transmittance mode and measure printing paper and ink color difference via reflectance mode to control metamerism issues;
• Pharmaceutical Particle Testing: Small apertures matched with micro fixtures to measure chromaticity, whiteness and yellowness indicators of pills and tablets.

The instrument can output spectral graphs, multiple color spaces such as Lab and LCh, calculate mainstream color difference formulas including ΔE*ab, ΔE00 and CMC, automatically judge pass/fail status of samples, and synchronously output dozens of chromaticity indicators such as haze, total transmittance, metamerism index, whiteness WI and yellowness YI, meeting the requirements of national standard test reports in various industries.

6. Conclusion
As a new-generation Benchtop Transmittance Spectrophotometer, LISUN DSCD-950P realizes intelligent operation relying on a 7-inch TFT capacitive touch screen and Android intelligent operating system; its open transmittance chamber, automatic multi-aperture identification and integrated accessory drawer deliver convenient structural design; the dual optical path full-spectrum spectroscopic system, four-speed ultraviolet detection and ultra-high repeatability optical system guarantee accurate measurement performance. It solves industry pain points of traditional color measuring instruments such as complicated operation, limited transmittance samples, insufficient precision and lack of fluorescent detection capacity.

This Benchtop Transmittance Spectrophotometer is compatible with multi-form samples including solids, liquids, powders and films, satisfying laboratory R&D and production line quality inspection demands of plastics, chemical engineering, textiles, printing, food, pharmaceutical and other industries. Domestic precision optical equipment realizes integrated intelligent color measurement for transmittance and reflectance, possessing promising market application and promotion value. Subsequent upgrades can expand cloud data upload and remote calibration functions based on the Android system to further optimize the intelligent color control system.