- 标题
- 摘要
- 关键词
- 实验方案
- 产品
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[IEEE 2018 IEEE Asian Solid-State Circuits Conference (A-SSCC) - Tainan, Taiwan (2018.11.5-2018.11.7)] 2018 IEEE Asian Solid-State Circuits Conference (A-SSCC) - A Fully-Integrated 25Gb/s Low-Noise TIA+CDR Optical Receiver designed in 40nm-CMOS
摘要： A fully-integrated 25Gbps low-noise optical receiver is presented that integrates a Transimpedance Amplifier (TIA), Continuous-Time Linear Equalizer (CTLE), high gain and high bandwidth Limiting Amplifier (LA), and Clock and Data-Recovery (CDR) into a single die. The TIA employs an inverter-based pseudo differential TIA with Cross-Coupled Negative Gm pair and a Negative capacitor to increase the signal bandwidth, while a MOSFET Corner Compensation (MCC) circuit compensates for the CMOS corner variation. An Automatic Gain Control (AGC) scheme is proposed that solves the group delay issue caused by TIA input impedance variation from small input to overload current. Finally, a 2x-oversampling CDR using a bang-bang phase detector is included. The 850nm VCSEL-based full-link measurement results show that the optical receiver achieves a sensitivity (BER<1e-12) of 52uApp (RSSI Current=51uA, ER=4.89dB) with a 150fF Photodiode from the 3.3V and 1.3V supplies, respectively.
关键词： CDR,corner compensation,optical receiver,auto gain control,low noise
更新于2025-09-23 15:23:52
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Uniform position-sensitivity verification of novel electrochemically-etched panorama mega-size polymer ion image detectors
摘要： Recent novel applications of mega-size polycarbonate ion image detectors processed in mega-size electrochemical etching chambers have raised concerns on uniform position-sensitivity and consistency in ion energy responses of detectors with different effective areas. In this context, the uniform position-sensitivity, detection efficiency and track diameters of alpha particles over a broad energy range in detectors of different effective areas; i.e. small size (2 × 2 cm2), medium sizes (17 × 17 cm2) and (22.6 × 22.6 cm2), as well as large (33 × 33 cm2) were investigated in order to make them independent of the detector effective area. Alpha particles of 6 different energies from ~0.3 to ~3.0 MeV at a fluence of ~1.0 × 104 alphas·cm?2 were studied applying 50 Hz – HV field conditions. As an example, 36 positions on 6 rows and 6 columns of a 33 × 33 cm2 detector were studied. By having the same efficiency and mean track diameter only at ~0.8 MeV alpha energy in different detector effective areas under the conditions applied, it is concluded that: (1) position-sensitivity, efficiency and alpha energy responses are consistently uniform independent of the detector effective areas for particles with dE/dX)particle ≥ dE/dX)alpha at ~0.8 MeV, but (2) a "voltage compensation factor" (Vc) commensurate with each detector effective area and type of particle should be applied for particles with dE/dX)particle < dE/dX)alpha at ~0.8 MeV for efficient, consistent and uniform ion detection.
关键词： Electrochemical etching,Polycarbonate track detectors,Effective detector area,Position-sensitivity,Voltage compensation factor
更新于2025-09-23 15:23:52
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[IEEE 2018 9th International Conference on Information Technology in Medicine and Education (ITME) - Hangzhou, China (2018.10.19-2018.10.21)] 2018 9th International Conference on Information Technology in Medicine and Education (ITME) - Extracting Photoplethysmographic Waveform from Bulbar Conjunctiva Video
摘要： Recently the conjunctival vascularity measurement based on image analysis has shown great potential in physiological monitoring and biometrics. However, the motion artifacts in the conjunctiva videos cause both large displacement and distinct illumination variety. In this paper, a novel approach is proposed to extract photoplethysmographic waveform from conjunctiva video. Which consists of video stabilization and dual-channel extraction to eliminate the two facets of the motion artifacts respectively. The heart rate measuring results have shown a good agreement between our method and the fingertip oximeter.
关键词： conjunctiva vessel,pulse wave,video stabilization,illumination compensation
更新于2025-09-23 15:23:52
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A Novel Method for Compensating Temperature Measurement Error Caused by Dust Using Infrared Thermal Imager
摘要： The dust generated in industrial processes has a serious impact on the accuracy of infrared thermometry, which is also the main reason for the limited use of infrared industrial temperature measurement methods applications. To reduce the influence of dust on infrared temperature measurement, this paper proposes a new method for compensating measurement error caused by dust. Firstly, the source of temperature measurement error caused by dust is analyzed, and a compensation method, in which the dust transmittance is important but difficult to determine, is proposed based on the principle of infrared temperature measurement. Then, to solve the difficulty of determining dust transmittance, we define a spatial temperature level co-occurrence matrix and a neighboring temperature level dependence matrix which can be utilized to extract the infrared thermal image’s texture features affected by dust. Finally, by integrating stacked denoising auto-encoder with optimized parameters and support vector regression, a dust transmittance model is established to determine dust transmittance based on the extracted features. Experimental results indicate that the proposed compensation method can reduce the influence of dust on infrared thermal imager’s accuracy effectively.
关键词： temperature measurement,dust transmittance,dust,texture feature,Compensation model,infrared thermal imager
更新于2025-09-23 15:23:52
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Two-Branch Fiber Link for International Clock Networks
摘要： We present our work on realizing two-branch fiber links enabling multiple-partner clock comparisons in Europe. We report in detail on the setup connecting two long-haul links and report for the relative frequency stability and accuracy. We report on a combined uptime of 90% for our dual-branch link during almost 1 month. We finally discuss the combined uncertainty contribution of the ensemble of the link architecture to a clock comparison. We show that the frequency transfer uncertainty is 2 × 10^{-19}.
关键词： two-way noise compensation,phase measurement,ultrastable frequency transfer,Optical fiber links,phase lock loop
更新于2025-09-23 15:23:52
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[IEEE 2018 25th IEEE International Conference on Image Processing (ICIP) - Athens, Greece (2018.10.7-2018.10.10)] 2018 25th IEEE International Conference on Image Processing (ICIP) - HSVCNN: CNN-Based Hyperspectral Reconstruction from RGB Videos
摘要： Hyperspectral video acquisition usually requires high complexity hardware and reconstruction algorithms. In this paper, we propose a low complexity CNN-based method for hyperspectral reconstruction from ubiquitous RGB videos, which effectively exploits the temporal redundancies within RGB videos and generates high-quality hyperspectral output. Specifically, given an RGB video, we first design an efficient motion compensation network to align the RGB frames and reduce the large motion. Then, we design a temporal-adaptive fusion network to exploit the inter-frame correlation. The fusion network has the ability to determine the optimum temporal dependency within successive frames, which further promotes the hyperspectral reconstruction fidelity. Preliminary experimental results validate the superior performance of the proposed method over previous learning-based methods. To the best of our knowledge, this is the first time that RGB videos are utilized for hyperspectral reconstruction through deep learning.
关键词： Hyperspectral reconstruction,temporal-adaptive fusion,RGB videos,motion compensation
更新于2025-09-23 15:23:52
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[IEEE IGARSS 2018 - 2018 IEEE International Geoscience and Remote Sensing Symposium - Valencia (2018.7.22-2018.7.27)] IGARSS 2018 - 2018 IEEE International Geoscience and Remote Sensing Symposium - Processing a New Hyperspectral Data Set for Target Detection and Atmospheric Compensation Algorithm Assessment: The RIT2017 Data Set
摘要： This paper introduces a new and challenging hyperspectral dataset to the remote sensing community called the 'RIT2017 Data Set' which can be used for the assessment of target detection algorithms. This dataset encompasses 90 targets in a background of up to 8 million pixels (or less if sub-setting). The same dataset can also be used for atmospheric compensation studies for it has identical sets of large panels in both the sun and full shadow. This paper briefly introduces the data collection campaign, the target objects, and addresses the radiometric fidelity of the imaging spectrometer data, which showed very good results. Lastly, the data is atmospherically compensated using an in-scene technique, which also showed fairly good results.
关键词： atmospheric compensation,physics-based modeling,hyperspectral imaging,target detection,radiative transfer
更新于2025-09-23 15:23:52
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Reduction and compensation of humidity measurement errors at cold temperatures using dual QCM humidity sensors based on graphene oxides
摘要： One of the difficulties in measurements of relative humidity in a variety of environments is temperature-dependence especially at cold temperatures. Here, we report on the reduction and the compensation of temperature effects on humidity measurements using dual humidity sensors based on quartz crystal microbalance (QCM). Graphene oxide film is coated on quartz crystals as a humidity sensing layer for the detection of water sorption by the change of resonance frequency. Relative humidity in a test chamber, where dual QCM humidity sensors are located, is precisely controlled using a humidity generator at the temperature range from 20 °C to ?60 °C. It is found that single QCM humidity sensors measure humidity significantly higher than reference relative humidity by the generator as temperature is lowered due to the temperature-dependent resonance of quartz crystals. In an attempt to cancel out the temperature-dependent oscillation of QCM sensors, the ratio of resonance frequencies of dual QCM humidity sensors is used. Consequently, temperature-dependent errors in humidity measurement at low temperatures are evidently reduced. For the compensation of the remaining errors in the humidity measurement by dual QCM humidity sensors, a single formula is empirically obtained. After the compensation of low temperature effects, the dual QCM humidity sensors provide the measurement capability in terms of residual errors less than 1.1%rh throughout temperatures from 20 °C to ?60 °C. This study provides a useful insight to extend the applicability of QCM-based humidity sensors to environments with cold temperatures.
关键词： Compensation,Graphene oxide,Cold temperature,Quartz crystal microbalance,Humidity measurement,Humidity sensor
更新于2025-09-23 15:23:52
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Recovering distance information in spectral domain interferometry
摘要： This work evaluates the performance of the Complex Master Slave (CMS) method, that processes the spectra at the interferometer output of a spectral domain interferometry device without involving Fourier transforms (FT) after data acquisition. Reliability and performance of CMS are compared side by side with the conventional method based on FT, phase calibration with dispersion compensation (PCDC). We demonstrate that both methods provide similar results in terms of resolution and sensitivity drop-off. The mathematical operations required to produce CMS results are highly parallelizable, allowing real-time, simultaneous delivery of data from several points of different optical path differences in the interferometer, not possible via PCDC.
关键词： distance measurement,spectral domain interferometry,optical coherence tomography,dispersion compensation,phase calibration,Complex Master Slave,Fourier transforms
更新于2025-09-23 15:23:52
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Incoherent Range Walk Compensation for Spaceborne GNSS-R Imaging
摘要： Global navigation satellite system reflectometry (GNSS-R) receivers produce delay-Doppler maps (DDMs) by incoherently integrating coherent integration results. Due to system dynamics, during incoherent integration, the receiver aligns each coherent result by tracking the delay and Doppler of the specular point. This is known to cause a blurring of the spatial footprint of the Woodward ambiguity function (WAF) on the reflecting surface. In this paper, we demonstrate that the blurring of the WAF varies over the glistening zone (GZ), and even if a fixed point on the ground is tracked, blurring still occurs. We derive the expressions for the delay and Doppler change rates over the GZ and then predict the error introduced by range walk for typical GNSS-R scatterometry configurations. We find that ≈6 dB of loss is expected for a point scatterer near the edge of the GZ when a fixed point on the surface is tracked. The incoherent range walk compensation (IRWC) method is then presented for GNSS-R receivers to mitigate this loss. The IRWC method focuses the power in the DDM to the isodelay and iso-Doppler configuration occurring at the midpoint of the integration time. DDMs produced by tracking a fixed point with and without IRWC are simulated, and errors are found to be in agreement with those predicted. Spatial domain GNSS-R products will be improved with IRWC. Target detection will benefit from a larger usable swath, allowing longer tracking and detection times as a result of the increased target to clutter and noise ratio. At the same time, imaging applications will no longer suffer from a spatially variant blurring of the WAF, which limits the resolution of the estimated products. IRWC is shown to mitigate the range migration losses and improve the SNR of an imaging GNSS-R receiver by ≈6 dB near the edge of the GZ.
关键词： integration,global navigation satellite system reflectometry (GNSS-R),reflectometry,imaging,target detection,receiver,incoherent range walk compensation (IRWC),Dynamic corrections
更新于2025-09-23 15:23:52