用于工业现场的傅里叶变换红外光谱仪往往要求具备与实验室设备相近的性能指标,且对体积、重量、抗震等方面的要求更为严格。在完美地利用立体角镜与平面折返镜组合的光学特性基础上,设计了一种高效稳定双摆式的干涉仪结构,能够从原理...用于工业现场的傅里叶变换红外光谱仪往往要求具备与实验室设备相近的性能指标,且对体积、重量、抗震等方面的要求更为严格。在完美地利用立体角镜与平面折返镜组合的光学特性基础上,设计了一种高效稳定双摆式的干涉仪结构,能够从原理上解决干涉仪调制度稳定性的问题。通过对动镜扫描系统的分析建模,建立动镜扫描速度与驱动器之间的数学关系,并利用数字信号处理器实现对其的闭环控制,使扫描误差大约在±0.2%的范围内。通过对仪器性能的测试以及标准样品的测试表明,仪器具有较高的信噪比与稳定性,能够满足工业应用的需求。When FTIR is used in industrial applications, it often requires performance similar to laboratory equipment, and is more stringent in terms of volume, weight, and seismic resistance. A highly efficient and stable pendulum structure interferometer based on the combination of cube corner mirror and planar retro-mirror was designed, the combination of cube corner mirror and flat retro-mirror is a perfect solution for interferometer modulation depth issues, because of their own optical characteristics, in principle, tilts and shift would have no effect on the modulation depth. Through the analysis and modeling of the moving mirror scanning system, the mathematical relationship between the scanning speed and the driver is established, and a closed-loop control is realized by using the digital signal processor so that the scanning error is about ± 0.2%. Through the test of the performance of the instrument and the test of some standard samples shows that the instrument has a good signal to noise ratio and stability, to meet the needs of industrial applications.展开更多
The infrared Fourier transform spectrometer needs a cold view field diaphragm to reduce stray radiation.For an infrared spectrometer with linear array detectors,the part of the view field diaphragm where the light pas...The infrared Fourier transform spectrometer needs a cold view field diaphragm to reduce stray radiation.For an infrared spectrometer with linear array detectors,the part of the view field diaphragm where the light passes can be regarded as a slit.If the infrared detectors are small in size,the width of the slit is also small,which will cause serious diffraction phenomena.If the widths of the view field diaphragm and the optical system are designed by geometric optics theory,the diffraction light cannot be fully received by the detectors,which will cause energy loss.Expanding the width of the view field diaphragm will introduce stray radiation.Meanwhile,spectrometer follow-up optics should be set in cold environments to reduce the infrared background of the instrument.Optical materials have different thermal characteristics,the optical and mechanical structures will deform at lowtemperature,and the cold view field diaphragm is installed at room temperature,so it is impossible to guarantee that the cold view field diaphragm remains in its design position when working at low-temperature.This paper solves the above problems by designing an adjustable cold view field diaphragm installed in its cryogenic vacuum chamber.The width and position of the view field diaphragm can be adjusted when working in cold temperatures,without opening the cryogenic vacuum chamber.Contrasting the interference signal obtained by the detectors in the adjustment process,the system can get the most suitable width and position of the cold view field diaphragm.The above works are based on the spectrometer used in the study named Accurate Infrared Magnetic Field Measurements of the Sun.展开更多
文摘用于工业现场的傅里叶变换红外光谱仪往往要求具备与实验室设备相近的性能指标,且对体积、重量、抗震等方面的要求更为严格。在完美地利用立体角镜与平面折返镜组合的光学特性基础上,设计了一种高效稳定双摆式的干涉仪结构,能够从原理上解决干涉仪调制度稳定性的问题。通过对动镜扫描系统的分析建模,建立动镜扫描速度与驱动器之间的数学关系,并利用数字信号处理器实现对其的闭环控制,使扫描误差大约在±0.2%的范围内。通过对仪器性能的测试以及标准样品的测试表明,仪器具有较高的信噪比与稳定性,能够满足工业应用的需求。When FTIR is used in industrial applications, it often requires performance similar to laboratory equipment, and is more stringent in terms of volume, weight, and seismic resistance. A highly efficient and stable pendulum structure interferometer based on the combination of cube corner mirror and planar retro-mirror was designed, the combination of cube corner mirror and flat retro-mirror is a perfect solution for interferometer modulation depth issues, because of their own optical characteristics, in principle, tilts and shift would have no effect on the modulation depth. Through the analysis and modeling of the moving mirror scanning system, the mathematical relationship between the scanning speed and the driver is established, and a closed-loop control is realized by using the digital signal processor so that the scanning error is about ± 0.2%. Through the test of the performance of the instrument and the test of some standard samples shows that the instrument has a good signal to noise ratio and stability, to meet the needs of industrial applications.
基金supported by the National Natural Science Foundation of China(NSFC,Grant No.11427901)。
文摘The infrared Fourier transform spectrometer needs a cold view field diaphragm to reduce stray radiation.For an infrared spectrometer with linear array detectors,the part of the view field diaphragm where the light passes can be regarded as a slit.If the infrared detectors are small in size,the width of the slit is also small,which will cause serious diffraction phenomena.If the widths of the view field diaphragm and the optical system are designed by geometric optics theory,the diffraction light cannot be fully received by the detectors,which will cause energy loss.Expanding the width of the view field diaphragm will introduce stray radiation.Meanwhile,spectrometer follow-up optics should be set in cold environments to reduce the infrared background of the instrument.Optical materials have different thermal characteristics,the optical and mechanical structures will deform at lowtemperature,and the cold view field diaphragm is installed at room temperature,so it is impossible to guarantee that the cold view field diaphragm remains in its design position when working at low-temperature.This paper solves the above problems by designing an adjustable cold view field diaphragm installed in its cryogenic vacuum chamber.The width and position of the view field diaphragm can be adjusted when working in cold temperatures,without opening the cryogenic vacuum chamber.Contrasting the interference signal obtained by the detectors in the adjustment process,the system can get the most suitable width and position of the cold view field diaphragm.The above works are based on the spectrometer used in the study named Accurate Infrared Magnetic Field Measurements of the Sun.
