The Experts below are selected from a list of 63846 Experts worldwide ranked by ideXlab platform
Guofan Jin - One of the best experts on this subject based on the ideXlab platform.
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compact Optical roll angle sensor with large measurement range and high sensitivity
Optics Letters, 2005Co-Authors: Changxi Yang, Enyao Zhang, Guofan JinAbstract:A simple and effective Optical roll-angle sensor based on a magnetic garnet single crystal is demonstrated. The measurement is based on the principle that, when linearly polarized light whose polarization varies alternately in two orthogonal directions passes through a polarization analyzer, the transmitted Optical intensity varies. The output voltage from an Optical Detector located after the analyzer can be used to determine the roll angle. The chief advantages of the sensor are that it is compact, flexible, low cost, and power effective and provides a fast response. Most importantly, the sensor is insensitive to various fluctuations such as Optical intensity, photodiode responsivity, and temperature and to vibrations. This performance is most advantageous in long-distance or long-term measurements. Experimental results have shown that the angular resolution is 0.01° in a ±30° range.
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compact Optical roll angle sensor with large measurement range and high sensitivity
Optics Letters, 2005Co-Authors: Changxi Yang, Enyao Zhang, Guofan JinAbstract:A simple and effective Optical roll-angle sensor based on a magnetic garnet single crystal is demonstrated. The measurement is based on the principle that, when linearly polarized light whose polarization varies alternately in two orthogonal directions passes through a polarization analyzer, the transmitted Optical intensity varies. The output voltage from an Optical Detector located after the analyzer can be used to determine the roll angle. The chief advantages of the sensor are that it is compact, flexible, low cost, and power effective and provides a fast response. Most importantly, the sensor is insensitive to various fluctuations such as Optical intensity, photodiode responsivity, and temperature and to vibrations. This performance is most advantageous in long-distance or long-term measurements. Experimental results have shown that the angular resolution is 0.01 degree in a +/-30 degree range.
Changxi Yang - One of the best experts on this subject based on the ideXlab platform.
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compact Optical roll angle sensor with large measurement range and high sensitivity
Optics Letters, 2005Co-Authors: Changxi Yang, Enyao Zhang, Guofan JinAbstract:A simple and effective Optical roll-angle sensor based on a magnetic garnet single crystal is demonstrated. The measurement is based on the principle that, when linearly polarized light whose polarization varies alternately in two orthogonal directions passes through a polarization analyzer, the transmitted Optical intensity varies. The output voltage from an Optical Detector located after the analyzer can be used to determine the roll angle. The chief advantages of the sensor are that it is compact, flexible, low cost, and power effective and provides a fast response. Most importantly, the sensor is insensitive to various fluctuations such as Optical intensity, photodiode responsivity, and temperature and to vibrations. This performance is most advantageous in long-distance or long-term measurements. Experimental results have shown that the angular resolution is 0.01° in a ±30° range.
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compact Optical roll angle sensor with large measurement range and high sensitivity
Optics Letters, 2005Co-Authors: Changxi Yang, Enyao Zhang, Guofan JinAbstract:A simple and effective Optical roll-angle sensor based on a magnetic garnet single crystal is demonstrated. The measurement is based on the principle that, when linearly polarized light whose polarization varies alternately in two orthogonal directions passes through a polarization analyzer, the transmitted Optical intensity varies. The output voltage from an Optical Detector located after the analyzer can be used to determine the roll angle. The chief advantages of the sensor are that it is compact, flexible, low cost, and power effective and provides a fast response. Most importantly, the sensor is insensitive to various fluctuations such as Optical intensity, photodiode responsivity, and temperature and to vibrations. This performance is most advantageous in long-distance or long-term measurements. Experimental results have shown that the angular resolution is 0.01 degree in a +/-30 degree range.
Juha Kostamovaara - One of the best experts on this subject based on the ideXlab platform.
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integrated receiver including both receiver channel and tdc for a pulsed time of flight laser rangefinder with cm level accuracy
IEEE Journal of Solid-state Circuits, 2009Co-Authors: Jan Nissinen, Ilkka Nissinen, Juha KostamovaaraAbstract:An integrated receiver that includes both the time-to-digital converter (TDC) and the receiver channel and is intended for a pulsed time-of-flight laser rangefinder with a measurement range of approximately 10 m has been designed and fabricated in a standard 0.13 mum CMOS process. The receiver operates by detecting the current pulse of an Optical Detector and producing a stop timing mark for the TDC by means of a leading edge timing discriminator. The TDC is used to measure the actual time interval between the start and stop pulses and the slew-rate of the stop pulse, to compensate for a walk error produced in the discriminator. The single-shot precision of the whole receiver is 250 ps for a minimum detectable signal, and its accuracy and power consumption are plusmn 37 ps with compensation within a dynamic range of at least 1:10,000 and less than 45 mW, respectively. The size of the die is 1300 mum times1300 mum including pads.
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receiver channel with resonance based timing detection for a laser range finder
IEEE Transactions on Circuits and Systems, 2006Co-Authors: Jani Pehkonen, P Palojarvi, Juha KostamovaaraAbstract:An integrated receiver channel for a pulsed time-of-flight laser range finder is presented. The receiver operates in a wide dynamic range without gain control. This is achieved by converting the received unipolar pulse to a bipolar waveform already after the Optical Detector before the signal is fed to amplifier blocks. Thus the nonlinearities of the amplifiers have the minimum effect on the timing point, which is located in the zero crossing of the bipolar pulse. A parallel resonant circuit is used to shape the pulse in the input of the channel, which consists of a cascade of limiting voltage amplifiers followed by a comparator. The measurements show that the receiver has a walk error of 74 ps in the dynamic range of 1:1280. This corresponds to 11 mm in distance. The minimum usable input signal is limited by the noise of the receiver and equals 1.9 muA
Enyao Zhang - One of the best experts on this subject based on the ideXlab platform.
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compact Optical roll angle sensor with large measurement range and high sensitivity
Optics Letters, 2005Co-Authors: Changxi Yang, Enyao Zhang, Guofan JinAbstract:A simple and effective Optical roll-angle sensor based on a magnetic garnet single crystal is demonstrated. The measurement is based on the principle that, when linearly polarized light whose polarization varies alternately in two orthogonal directions passes through a polarization analyzer, the transmitted Optical intensity varies. The output voltage from an Optical Detector located after the analyzer can be used to determine the roll angle. The chief advantages of the sensor are that it is compact, flexible, low cost, and power effective and provides a fast response. Most importantly, the sensor is insensitive to various fluctuations such as Optical intensity, photodiode responsivity, and temperature and to vibrations. This performance is most advantageous in long-distance or long-term measurements. Experimental results have shown that the angular resolution is 0.01° in a ±30° range.
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compact Optical roll angle sensor with large measurement range and high sensitivity
Optics Letters, 2005Co-Authors: Changxi Yang, Enyao Zhang, Guofan JinAbstract:A simple and effective Optical roll-angle sensor based on a magnetic garnet single crystal is demonstrated. The measurement is based on the principle that, when linearly polarized light whose polarization varies alternately in two orthogonal directions passes through a polarization analyzer, the transmitted Optical intensity varies. The output voltage from an Optical Detector located after the analyzer can be used to determine the roll angle. The chief advantages of the sensor are that it is compact, flexible, low cost, and power effective and provides a fast response. Most importantly, the sensor is insensitive to various fluctuations such as Optical intensity, photodiode responsivity, and temperature and to vibrations. This performance is most advantageous in long-distance or long-term measurements. Experimental results have shown that the angular resolution is 0.01 degree in a +/-30 degree range.
Lijian Zhang - One of the best experts on this subject based on the ideXlab platform.
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experimental quantification of coherence of a tunable quantum Detector
Physical Review Letters, 2020Co-Authors: Thomas Theurer, Dario Egloff, Ziwen Liu, Martin B Plenio, Lijian ZhangAbstract:Quantum coherence is a fundamental resource that quantum technologies exploit to achieve performance beyond that of classical devices. A necessary prerequisite to achieve this advantage is the ability of measurement devices to detect coherence from the measurement statistics. Based on a recently developed resource theory of quantum operations, here we quantify experimentally the ability of a typical quantum-Optical Detector, the weak-field homodyne Detector, to detect coherence. We derive an improved algorithm for quantum Detector tomography and apply it to reconstruct the positive-operator-valued measures of the Detector in different configurations. The reconstructed positive-operator-valued measures are then employed to evaluate how well the Detector can detect coherence using two computable measures. As the first experimental investigation of quantum measurements from a resource theoretical perspective, our work sheds new light on the rigorous evaluation of the performance of a quantum measurement apparatus.
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recursive quantum Detector tomography
arXiv: Quantum Physics, 2012Co-Authors: H B Coldenstrodtronge, Martin B Plenio, Lijian Zhang, Animesh Datta, Xianmin Jin, Jens Eisert, Ian A WalmsleyAbstract:Conventional tomographic techniques are becoming increasingly infeasible for reconstructing the operators of quantum devices of growing sophistication. We describe a novel tomographic procedure using coherent states which begins by reconstructing the diagonals of the operator, and then each successive off-diagonal in a recursive manner. Each recursion is considerably more efficient than reconstructing the operator in its entirety, and each successive recursion involves fewer parameters. We apply our technique to reconstruct the positive-operator-valued measure (POVM) corresponding to a recently developed coherent Optical Detector with phase sensitivity and number resolution. We discuss the effect of various parameters on the reconstruction accuracy. The results show the efficiency of the method and its robustness to experimental noise.
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mapping coherence in measurement via full quantum tomography of a hybrid Optical Detector
Nature Photonics, 2012Co-Authors: Graciana Puentes, J S Lundeen, H B Coldenstrodtronge, Brian J Smith, Lijian Zhang, Animesh Datta, Xianmin Jin, Martin B PlenioAbstract:Quantum states and measurements exhibit wave-like (continuous) or particle-like (discrete) character. Hybrid discrete–continuous photonic systems are key to investigating fundamental quantum phenomena1,2,3, generating superpositions of macroscopic states4, and form essential resources for quantum-enhanced applications5 such as entanglement distillation6,7 and quantum computation8, as well as highly efficient Optical telecommunications9,10. Realizing the full potential of these hybrid systems requires quantum-Optical measurements sensitive to non-commuting observables such as field quadrature amplitude and photon number11,12,13. However, a thorough understanding of the practical performance of an Optical Detector interpolating between these two regions is absent. Here, we report the implementation of full quantum Detector tomography, enabling the characterization of the simultaneous wave and photon-number sensitivities of quantum-Optical Detectors. This yields the largest parameterization to date in quantum tomography experiments, requiring the development of novel theoretical tools. Our results reveal the role of coherence in quantum measurements and demonstrate the tunability of hybrid quantum-Optical Detectors. By developing full quantum Detector tomography, researchers simultaneously characterize the wave- and photon-number sensitivities of quantum-Optical Detectors to yield the largest ever parametrization in a quantum tomography experiment. The presented results reveal the role of coherence in quantum measurements and demonstrate the tunability of hybrid quantum-Optical Detectors.