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- 实验方案
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A fast interrogation system of FBG sensors based on low loss jammed-array wideband sawtooth filter
摘要： In this paper, a low loss jammed-array wideband sawtooth (JAWS) filter is built based on a finite reflection virtually imaged array (FRVIA) which has a lower reflectivity of the exit surface compared to a virtually imaged phased array (VIPA). This filter can be used as an edge filter to interrogate the fiber Bragg grating (FBG) sensors. A fast FBG sensing system is set up to detect the strain wave of iron pipe to demonstrate the use of this interrogator. The result shows that the JAWS based interrogation system has advantages of high speed, low loss and high sensitivity.
关键词： JAWS filter,Fiber Bragg grating (FBG) interrogator,Finite reflection virtually imaged array
更新于2025-11-28 14:24:03
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Optogenetic control of perforant pathway kindled seizures by photoinhibition of CA3 after insertion of Jaws into CA3 neuronal cells
摘要： Medial temporal lobe epilepsy (MTLE) is among the most common and most drug-resistant types of epilepsies associated with remodeling of the trisynaptic circuit of the hippocampus. The cornu ammonis (CA)3 region, as the “pacemaker” of the circuit, and CA3 → CA1 synapse (Scha?er collaterals) are potential targets for suppression of MTLE. We examined optogenetic manipulation of CA3 neurons in controlling the perforant pathway kindled seizures. One week after implantation of stimulating electrodes in perforant pathway, a recording electrode in CA1, and an optic ?ber in CA3, rats underwent rapid kindling procedure. A lentivector with capability to move in retrograde monosynaptic direction and to insert the gene of red light sensitive opsin Jaws in neurons was injected into CA1 of the kindled rats. One week later, the kindled rats were stimulated at after-discharge (AD) threshold under red light illumination to CA3; and duration of AD (ADD), generalized seizures (S5D), and total seizure behavior (SD) were recorded. Encoding Jaws in CA1, CA3, and entorhinal neuronal cells of the vector injected rats was veri?ed by immunohistochemistry. More than 90% of CA1, CA3, and entorhinal neurons of the counted sections expressed Jaws. Red light (625 nm) illumination to CA3 of the kindled rats expressing Jaws entirely suppressed generalized seizures and signi?cantly diminished ADD and SD. Encoding the light-sensitive chloride pump Jaws in the CA3, is an e?cient optogenetic strategy to stop perforant pathway kindled seizures.
关键词： Optogenetics,Entorhinal cortex,Scha?er collaterals,Perforant pathway kindling,CA3,Jaws
更新于2025-09-23 15:19:57
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[IEEE 2018 Conference on Precision Electromagnetic Measurements (CPEM 2018) - Paris, France (2018.7.8-2018.7.13)] 2018 Conference on Precision Electromagnetic Measurements (CPEM 2018) - Towards Wideband Voltage Scaling to Quantum Standards at the Accuracy of the Stability
摘要： A divider architecture and measurement method to scale arbitrary waveforms to 'spectrally pure Josephson Voltage Standards' so called JAWS is presented. The architecture and measurement method are investigated by simulations. Challenging sides of the architecture and the method, and the solutions are defined. The constructed prototype divider and some of the preliminary measurements are presented
关键词： Arbitrary waveforms,Inductive Voltage Divider,JAWS,Thermal Transfer Techniques,Voltage ratio,Josephson Voltage Standards
更新于2025-09-10 09:29:36
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[IEEE 2018 Conference on Precision Electromagnetic Measurements (CPEM 2018) - Paris, France (2018.7.8-2018.7.13)] 2018 Conference on Precision Electromagnetic Measurements (CPEM 2018) - A Novel Method for Calibration of ADC Using JAWS
摘要： A new method for the calibration of digitizers was tested. This method uses the unique ability of Josephson Arbitrary Waveform Synthesizer (JAWS) to generate almost any waveform with high precision. A complex waveform has been prepared such that the gain of a digitizer at different frequencies and amplitudes was calibrated simultaneously. The stability of the gain was also evaluated.
关键词： calibration,Josephson arbitrary waveform synthesizer,analogue-digital converter,stability,ADC,JAWS
更新于2025-09-10 09:29:36