Design Research And Application Of LED-based Portable UV-NIR Full-spectrum Tunable Light Source System

Compared with traditional light sources,LEDs have the advantages of environmental friendliness,long lifespan,and high efficiency as a solid-state electroluminescent light source.They have been widely applied in daily life,industrial productio n,and scientific research.In addition,the adjustable spectral characteristics and convenient dimming methods of LEDs provide infinite possibilities to meet the requirements of high color quality and diversification in multiple fields such as multispectr al imaging,color calibration,biological lighting,detection,and solar simulators.However,the existing spectrum-adjustable light source systems often use a combination of multi-color LEDs and integrating spheres to achieve narrow wavelength range,few spectral bands,and large volume.At the same time,they lack software for convenient spectral adjustment and cannot meet some applications that demand both performance and portability.Therefore,this thesis aims to address the limitations of existing sys tems and develop a portable UV-NIR full-spectrum adjustable LED light source system.The specific research contents are as follows:(1)Firstly,a UV-NIR broad-spectrum adjustable LED light source system covering the range of 36 7 nm to 987 nm was designed.The system includes 81 LED chips of different wavelengths and hardware circuits.The wavelength adjustment is achieved by controlling any combination of LED chips to cover hundreds of spectral wavelengths.(2)Using phosphors,quantum dots,band gap gradient semiconductor materials and other light-emitting materials to optimally supplement the missing spectral bands of LED arrays and further enhance the spectral resolution of LED spectrally tunable light sources.(3)The entire hardware circuit sy stem adopts a three-layer stacked design,reducing the volume to 7 cm *8 cm*6 cm.After being equipped with an optical system housing,the volume of the entire adjustable light source system is 9 cm *9 cm*15 cm,which is convenient to carry arou nd.Each LED control circuit outputs current to drive an LED independently without interference.Using the high-precision,low-noise DAC6311 chip,the current of each circuit can be finely adjusted within the range of 0～1 A to achieve small-volume,high-precision LED driving.(4)The optical path design is optimized to achieve small volume and high light collection efficiency.Using high-reflectivity materials to reflect and collect light,uniform light plates to homogenize the light beam,and lenses to focus the light beam into an optical fiber,it is convenient for use in different application scenarios.(5)An Android-based mobile APP is designed for on-site detection.The entire adjustable light source can be wirelessly controlled through the Bluetooth communication protocol.Users can adjust the LED and change the color and brightness of the LED group through the control interface of the mobile APP.(6)Finally,the application of the LED spectrum-adjustable light source designed in this thesis was explored in simula ting arbitrary spectral light sources,reconstructing reflectance,and analyzing material composition.