1 清华大学精密仪器系精密测试技术及仪器国家重点实验室, 北京 100084
2 清华大学深圳国际研究生院先进制造学部, 广东 深圳 518055
距离测量作为几何量测量关键共性基础技术之一,在科学研究、高端装备制造及空间探测等领域有重要应用。新兴的双光梳绝对测距技术充分发挥了光学频率梳的时域超短脉冲和频域高分辨特性,能实现大范围、高精度、高测速的绝对距离测量。首先,在简要阐述双光梳基本原理的基础上,着重介绍了双光梳飞行时间法测距和相位法测距的研究进展;然后,介绍了双光梳测距技术的功能拓展、仪器化进程及应用实例;最后,对双光梳测距的发展进行了展望。
测量 绝对距离测量 双光梳 飞行时间法测距 相位法测距 仪器化及应用 中国激光
2021, 48(15): 1504002
Author Affiliations
Abstract
1 State Key Laboratory of Precision Measurement Technology and Instruments, Department of Precision Instrument, Tsinghua University, Beijing 100084, China
2 Division of Advanced Manufacturing, Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, China
Precise and fast determination of position and orientation, which is normally achieved by distance and angle measurements, has broad applications in academia and industry. We propose a dynamic three-degree-of-freedom measurement technique based on dual-comb interferometry and a self-designed grating-corner-cube (GCC) combined sensor. Benefiting from its unique combination of diffraction and reflection characteristics, the absolute distance, pitch, and yaw of the GCC sensor can be determined simultaneously by resolving the phase spectra of the corresponding diffracted beams. We experimentally demonstrate that the method exhibits a ranging precision (Allan deviation) of 13.7 nm and an angular precision of 0.088 arcsec, alongside a 1 ms reaction time. The proposed technique is capable of precise and fast measurement of distances and two-dimensional angles over long stand-off distances. A system with such an overall performance may be potentially applied to space missions, including in tight formation-flying satellites, for spacecraft rendezvous and docking, and for antenna measurement as well as the precise manufacture of components including lithography machines and aircraft-manufacturing devices.
Photonics Research
2021, 9(2): 02000243
1 昆明物理研究所,云南昆明 650223
2 清华大学深圳研究生院,深圳 518055
研究了远程迎头探测飞机目标的红外辐射特性。分别介绍了飞机迎头的主要红外辐射源,飞机红外辐射特性的计算流程,以及红外光电系统入瞳接收到的蒙皮红外辐射能通量的计算模型,最后对远程探测水平路径大气透过率和飞机目标红外辐射强度进行仿真计算。
红外辐射特性 飞机目标 红外辐射强度 infrared infrared signature aircraft target Infrared radiation intensity
Author Affiliations
Abstract
Division of Advanced Manufacturing, Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, China
A new miniature spectrometer with two entrance slits is proposed to expand the spectral band. The proposed spectrometer is designed such that the two entrance slits share the same concave grating and detector array. The two slits are located at different positions such that the spectral range of the same light source incident on the detector array varies greatly between the two slits. Only one of the two slits is illuminated at a given time; as such, the two spectral ranges are sequentially measured. Theoretical calculation and experimentation are conducted to verify the proposed design.
050.1950 Diffraction gratings 220.4830 Systems design 300.6190 Spectrometers Chinese Optics Letters
2015, 13(11): 110501
Author Affiliations
Abstract
Institute of Optoelectronic Technology, China Jiliang University, Hangzhou, 310018, China
A tilt sensor based on an intermodal photonic crystal fiber (PCF) interferometer is demonstrated. The sensor consists of a tubular filled with NaCl aqueous solutions and an intermodal PCF interferometer, which is formed by using a short PCF with two single-mode fibers (SMFs) spliced at both ends, and the air-holes in the splice regions are fully collapsed. The intermodal PCF interferometer is fixed in a rigid glass tubular with a slant orientation, and a half of the PCF is immersed in the NaCl aqueous solutions, while the other half is exposed in air. When tilting the tubular, the length of the PCF immersed changes so that the transmission spectrum moves. Therefore, by monitoring the wavelength shift, the tilt angle can be achieved. In the experiment, a 0.8-cm-length intermodal PCF interferometer was adopted. The sensitivity of the proposed sensor was obtained from -1.5461 nm/° to -30.1244 nm/° when measuring from -35.1° to 37.05°.
Tilt sensors photonic crystal fiber interferometer intermodal Photonic Sensors
2014, 4(3): 209
1 浙江大学 现代光学仪器国家重点实验室,浙江 杭州 310027
2 中国计量学院 光电子技术研究所,浙江 杭州 310018
提出了一种新颖的光纤布拉格光栅(FBG)倾斜传感器设计,采用4根反射波长不同的FBG,该结构更简单和稳定,可用来测量平面内两维方向的倾斜角度,具有高灵敏性和测量精度,且无需附加的温度补偿装置即可消除环境温度的影响。初步的实验结果证实了该设计的可行性,表明此倾斜传感器的角度准确度和精度非常好,可以达到约0.3°的精度。需要强调的是,此倾斜传感器的性能还可进一步提高,通过增加悬垂物重量,或减小每对光纤之间的夹角来提高准确度和精度。
光纤布拉格光栅(FBG) 光纤传感器 温度不敏感 倾斜度测量
1 浙江大学现代光学仪器国家重点实验室, 浙江 杭州 310027
2 中国计量学院光电子技术研究所, 浙江 杭州 310018
设计了一种用于二维平面内的倾斜角测量的光纤布拉格光栅(FBG)传感器,采用4根光纤布拉格光栅,可用来测量平面内二维方向的倾斜角度,且无需附加温度补偿装置即可消除环境温度的影响。实验结果表明该设计具有高灵敏性和测量精度,其倾斜角度的准确度和精度非常好,大约可以达到0.009°的精度。此外,该倾斜传感器的准确度和精度还可通过增加设计中的悬垂重物质量,减小每对光纤之间的夹角来提高。如果进一步缩小该设计的整体结构大小,还可消除因空气扰动引起的4个光纤布拉格光栅温度不一致而引起的误差,减小环境温度对测量结果的影响。
光纤布拉格光栅 光纤传感器 温度不敏感 倾斜度测量