In fields such as photovoltaic cell efficiency testing, space environment simulation of aerospace materials, research on photocatalytic reactions, and light regulation in precision agriculture, the demand for a "controllable light environment" is becoming increasingly strict - it not only requires the spectral matching degree to conform to the characteristics of natural light or specific scene light, but also needs to ensure the stability of light intensity, spatial uniformity, and long-term operational reliability. Saifan Optoelectronics has been deeply engaged in optoelectronic technology for 20 years. Based on the "hybrid light source architecture + intelligent calibration algorithm + extreme environment adaptation design", the solar simulator it has developed has achieved high-precision coverage of the entire wavelength range from 350nm to 1100nm, meeting international standards such as IEC 60904-9 and ASTM E927. At the same time, customized technical solutions have been formed for special scenarios such as aerospace and agriculture, becoming the core equipment for the construction of light environments in multiple industries.
I. Core Technical Architecture: Collaborative Design of Hybrid light Source and intelligent light Control System
The technical core of the Saifan solar simulator lies in addressing the pain points of traditional devices such as incomplete spectral coverage, poor light intensity stability, and weak scene adaptability through "hardware architecture optimization + software algorithm empowerment". Its core technical module can be decomposed into three parts:
1. Hybrid light source system: A full-spectrum coverage solution featuring xenon lamps and LED supplementary lighting
Traditional single xenon lamp light sources have problems such as insufficient energy in the near-infrared band and poor continuity in the ultraviolet band of LED light sources. Saifan adopts a hybrid architecture of "short-arc xenon lamps as the main and multi-channel LED supplementary lighting as the auxiliary", achieving seamless coverage of the entire band from 350nm to 1100nm.
Selection of short-arc xenon lamps: Imported 1500W ultra-high pressure short-arc xenon lamps are adopted. The color temperature is stable at 5500K±200K. The energy distribution in the 400nm-800nm visible light band matches the AM1.5G standard spectrum by more than 95%, and it has a continuous operation life of 1000 hours.
LED supplementary light array To address the energy gap of xenon lamps in the 350nm-400nm ultraviolet band and 800nm-1100nm near-infrared band, a 128-channel high-power LED array is designed (365nm/385nm chips are used in the ultraviolet band, and 850nm/940nm/1050nm chips are used in the near-infrared band). The power regulation of each channel from 0 to 100% is achieved through an independent current drive module to ensure that the spectral matching degree of the entire band reaches grade A + (under the IEC 60904-9 standard, the matching error is ≤±2%).
Optical uniform light design It adopts a three-stage uniform light system of "aspheric condenser + integrating sphere + cosine corrector". The inner diameter of the integrating sphere reaches 500mm, and the inner wall is sprayed with high diffuse reflection material (reflectivity ≥99%). Combined with a 25mm diameter cosine corrector, it ensures that the light intensity uniformity within the 100mm×100mm range at the light outlet is ≤±3%. Meet the testing requirements of large-area samples.
2. High-precision temperature control and stable drive technology
The stability of light intensity is directly related to the operating temperature of the equipment. Through the design of "dual circulation temperature control + constant current drive", Saifan has maintained the long-term stability of light intensity at 0.08%/h (better than the industry average of 0.3%/h).
Dual circulation water cooling system: Independent water cooling circuits are designed for xenon lamps and LED arrays respectively. The xenon lamp circuit adopts titanium alloy heat exchangers, with a temperature control accuracy of ±0.1℃, to avoid light intensity drift caused by temperature fluctuations of the lamp body. The LED array circuit adopts microchannel water cooling plates, with each LED chip corresponding to an independent heat dissipation channel, ensuring that the array temperature uniformity is ≤±2℃ and preventing spectral shift caused by local overheating.
Constant current and constant voltage drive module: It adopts a constant current drive circuit controlled by an imported DSP chip, with a current stability of ≤±0.01% and a voltage ripple of ≤5mV. It also features overcurrent, overvoltage, and over-temperature protection functions to ensure the stability and safety of the light source during long-term operation.
Light intensity feedback regulation: High-precision silicon photovoltaic cells (with a measurement range of 0-2000W/m² and an accuracy of ±0.5%) are set at the light outlet to collect light intensity data in real time and feed it back to the control system. The power of the light source is dynamically adjusted through the PID algorithm to achieve a light intensity fluctuation of ≤±0.1%/h.
3. Intelligent calibration and scene adaptation algorithms
In response to the diverse lighting environment requirements of different industries, Saifan has developed a dual algorithm module of "spectral calibration + scene simulation" to enhance the flexibility and accuracy of the equipment
The 5th generation spectral fitting algorithm Based on a database of 2 million sets of measured spectra (covering standard light sources such as AM1.5G, AM0, D65, as well as surface light characteristic data of Mars and the Moon), the spectra of mixed light sources are fitted by the least square method, supporting user-defined spectral curves (such as enhancement and attenuation in specific bands), with a fitting error of ≤±0.5%.
Multi-scenario simulation algorithm: Equipped with 12 preset scenario modes such as "Photovoltaic testing", "Aerospace material aging", "photocatalytic reaction", and "plant growth", users can invoke them with one click. It simultaneously supports setting dynamic light environments (such as day-night alternation, light intensity gradient changes, and pulsed light) through the upper computer software, with a time accuracy of up to 1ms, meeting the requirements of dynamic light response testing.
Data traceability and calibration: The device is equipped with an internal spectrometer (wavelength accuracy ±0.1nm, resolution 0.5nm), supporting regular automatic calibration. Calibration data can be stored and exported, meeting the data traceability requirements of ISO 17025 laboratory certification.
Ii. Compliance of key performance indicators with industry standards
The core performance indicators of the Saifan solar simulator all reach or exceed the international mainstream standards, and can meet the strict testing requirements of multiple industries
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