Spectral analysis technology has deeply penetrated into fields such as research, industry, and environmental monitoring - material development requires "precise positioning at the nanometer level", pollutant detection demands "precise capture of weak signals", and light source calibration relies on "high-purity monochromatic light output". However, traditional monochromators face four major industry pain points: insufficient suppression of stray light in single-grating structures (generally > 1×10^-6), resulting in interference of weak signals; spectral resolution is only about 0.3nm, unable to distinguish adjacent spectral lines; wavelength drift exceeds ±0.2nm/℃, causing distortion of long-term experimental data; imported high-end equipment costs over 150,000 yuan, with a customization cycle of up to 3 months, and core technology blockage leading to high maintenance costs.
Beijing Saifan Optoelectronics has been deeply engaged in optical core technologies for 22 years. In collaboration with the Institute of Optics and Mechanics of the Chinese Academy of Sciences, it has jointly developed the SGM-8000 series dual-grating scanning monochromator, leveraging "dual-grating coupling suppression of stray light, nanometer-level precise spectral division, global stable control, and flexible adaptation for multiple scenarios", to redefine the standard for high-end monochromators and become the "precise spectral division core equipment" in fields such as research spectral analysis, industrial precision detection, and environmental pollutant monitoring, completely resolving the industry predicament of "stray light interference, insufficient resolution, and unstable data" in spectral analysis.
1. Core Technology One: Dual-grating Common-mode Stray Light Suppression Technology - Stray light ≤ 1×10^-9, signal purity increased by 1000 times
In response to the pain point of weak single-grating monochromators' insufficient stray light suppression, Saifan adopts the "symmetrical Littrow dual-grating structure + dispersion subtraction mode" to achieve the ultimate suppression of stray light:
Technical principle: Innovatively adopts a "sandwich-like" dual-grating sandwich design, with two-level gratings precisely adjusted through a precise optical path, using common-mode error suppression technology to make the effective spectral signal converge along the original path after chromatic dispersion cancellation and be blocked by the stray light that deviates from the path; combined with the independently developed "multi-level slit optimization algorithm", through precise control of the height of the incident slit (0-20mm adjustable), to suppress the influence of spectral line curvature on stray light, further improving spectral purity;
Industry breakthrough: Stray light suppression level is low to ≤ 1×10^-9, 1000 times higher than that of single-grating equipment (1×10^-6), far exceeding the industry average, capable of accurately capturing weak signals such as Raman spectra and fluorescence spectra, completely eliminating the interference of stray light on the identification of characteristic spectral lines;
Precise guarantee: Spectral purity ≥ 99.999%, output single-color light wavelength half-width (FWHM) low to 0.1nm, capable of clearly distinguishing adjacent characteristic spectral lines with an interval of 0.2nm, data can be directly connected to ISO 17025 spectral analysis standards and NIST calibration system.
2. Core Technology Two: Nanometer-level Precise Spectral Division System - Resolution 0.1nm, wavelength repeatability ±0.05nm
Breaking through the limitation of traditional monochromators that "resolution and scanning speed cannot be achieved simultaneously", Saifan through optical design and drive technology upgrades, achieves dual breakthroughs in high precision and efficient scanning:
Technical principle: Adopting a 1200 lines/mm high etching density holographic闪耀 grating， combined with an optimized Czerny-Turner optical structure， with a focal length of 300mm， effectively improving spectral dispersion efficiency； integrating a high-precision grating displacement drive module， equipped with a "dynamic wavelength calibration algorithm"， through real-time compensation of grating rotation errors， ensuring precise wavelength positioning；
Industry breakthrough： Spectral resolution reaches 0.1nm (@435.8nm)， 2 times higher than the industry mainstream 0.3nm resolution， capable of accurately analyzing the fine spectral structure of materials； Wavelength accuracy ±0.1nm, repeatability ±0.05nm. During continuous operation for 2000 hours, the wavelength drift is ≤±0.08nm, which is far superior to the drift standard of imported equipment at ±0.2nm.
Efficiency innovation: Supports rapid scanning in a wide wavelength range of 190-1100nm, with a scanning speed of up to 1000nm/s. This is 5 times more efficient than traditional equipment, while also supporting step scanning (with a minimum step size of 0.01nm) and continuous scanning modes for free switching, suitable for different spectral analysis requirements.
Three. Core Technology Three: Global Stability Control System - Temperature drift suppression ≤±0.01nm/℃, no distortion during long-term operation
In response to the problem of wavelength drift caused by environmental temperature changes, Saifan has constructed a "mechanical - electronic - algorithm" three-in-one stable control system:
Technical principle: Uses an aerospace-grade aluminum alloy integrated body, which undergoes constant temperature aging treatment to effectively suppress mechanical deformation; includes a high-precision temperature control module to control the temperature difference of the grating cavity within ±0.1℃, eliminating the influence of temperature on the optical path; integrates Xilinx Artix-7 series FPGA chips, which can monitor the grating position in real time at 10kHz frequency sampling, correcting the drive error within milliseconds to ensure long-term operation stability;
Industry breakthrough: The temperature drift suppression capability is low to ≤±0.01nm/℃, which is 10 times higher than the industry standard of ±0.1nm/℃, and still maintains precise output in the -10℃ to 45℃ wide temperature range; during continuous operation for 72 hours, the spectral intensity fluctuation is ≤±0.5%, the data repeatability is 99.8%, perfectly adapting to long-term experimental requirements such as photovoltaic material aging tests and environmental long-term monitoring;
Intelligent protection: Includes designs such as grating overload protection and dust-proof sealing of the optical path, reducing environmental interference and mechanical wear, with a device lifespan exceeding 15 years and a failure rate of less than 0.5% per year.
Four. Core Technology Four: Multi-scenario Modular Adaptation - Interface compatibility + function customization, seamless integration with detection systems
Break through the limitation of "single equipment adapting to a single scenario", Saifan achieves seamless collaboration among multiple fields and devices through modular design and standardized interfaces:
Technical principle: Uses standardized SMA interfaces, which can directly adapt to Saifan 7ILXC300 xenon light source, detector, integrating sphere, etc., and is also compatible with third-party spectral analysis systems; supports grating customization (600-2400 lines/mm selectable), which can optimize the resolution of specific wavelength bands according to application scenarios, such as the ultraviolet band (190-400nm) and the visible light band (400-760nm);
Scenario breakthrough: For Raman spectral analysis, optimize the suppression of stray light in the near-infrared band, improving the sensitivity of weak signal detection by 30%; for environmental monitoring, support multi-channel synchronous acquisition, capable of simultaneously analyzing multiple gas components (such as SO₂, NOx), with a detection limit as low as ppb level; for biomedical scenarios, adopt a low-noise optical path design, suitable for fluorescence spectroscopy, infrared absorption spectroscopy, and other biological molecule analysis requirements;
Intelligent linkage: Supports RS485, Ethernet, and USB3.0 interfaces, is equipped with independently developed spectral analysis software, which can achieve integrated operations of wavelength setting, scanning control, data acquisition, and analysis, and also supports secondary development with LabVIEW and Python, suitable for the construction of automated detection systems.
Scenario implementation: Verification of "precise spectral separation capabilities" in three major fields Research and Experiment Field: The materials science laboratory of a certain university selected the SGM-8000 to conduct spectral characterization of perovskite materials. With its 0.1nm high-resolution capability, it successfully analyzed the defect state characteristic peaks of perovskite films. The related research results were published in "Advanced Functional Materials".
Industrial Inspection Field: A semiconductor enterprise used the SGM-8000 to conduct optical performance detection of chip coatings. Through nanoscale wavelength positioning, it precisely controlled the coating thickness deviation ≤ ±5nm, and the product qualification rate increased by 20%. A photovoltaic component factory used it for the calibration of the solar simulator light source, with the wavelength calibration accuracy reaching ±0.05nm, ensuring the stable output of the simulator at the 3A standard.
Environmental and Medical Field: A certain environmental protection institution used the SGM-8000 to build an atmospheric pollutant monitoring system, achieving ppb-level detection of pollutants such as SO₂ and NOx. The data had a correlation of 99.5% with the national standard method. A biomedicine enterprise used it for fluorescence immunoassay, with the accuracy of biological molecule characteristic spectral recognition increasing by 30% and the detection cycle shortened by 40%.
Brand Technology Endorsement: Domestic substitution, breaking overseas monopoly
Patent Protection: It has 32 core patents including dual grating coupling design and wavelength stable control. It cooperated with the Institute of Optics and Fine Mechanics of the Chinese Academy of Sciences to formulate the "Technical Requirements for Dual Grating Monochromator" industry standard. The technical level reached international leading, and some indicators exceeded similar products from Newport and Zhuoli Han Guang;
Cost Advantage: The product price is only 50% of the imported similar products. Core components provide 3-year warranty, lifetime free technical upgrade, and maintenance costs are only 1/5 of the imported equipment, significantly reducing the equipment investment threshold for research and industrial inspection;
Customization Capability: It supports customizing the spectral range, grating type, interface specification, etc. according to customer needs. The customization cycle is only 30 days, which is 60% shorter than the imported equipment. A vacuum environment adaptation version customized by a certain aerospace institute still maintains stable output under 10^-5Pa vacuum.
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