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Related Concept Videos

Passive Filters01:27

Passive Filters

700
Passive filters are utilized to shape the frequency spectrum of signals across a diverse array of applications. These filters, using only passive elements like resistors (R), inductors (L), and capacitors (C), are capable of selectively allowing or blocking certain frequency ranges without the need for external power sources.
Low-Pass Filters
Low-pass filters are designed to transmit signals with frequencies lower than the cutoff frequency, ωc, and attenuate those above it. The cutoff...
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Design Example: Capacitance Multiplier Circuit01:20

Design Example: Capacitance Multiplier Circuit

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In integrated circuit technology, a capacitance multiplier is often utilized to produce a larger capacitance value when a small physical capacitance falls short. This is achieved by a circuit that multiplies capacitance values by a factor of up to 1000, such that a 10-pF capacitor can replicate the performance of a 100-nF capacitor.
The circuit illustrated in Figure 1 below incorporates two op-amps, with the first operating as a voltage follower and the second acting as an inverting amplifier.
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NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences01:17

NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences

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A pulse is a short burst of radio waves distributed over a range of frequencies that simultaneously excites all the nuclei in the sample. Upon passing a radio frequency pulse along the x-axis, the nuclei absorb energy corresponding to their Larmor frequencies and achieve resonance. This shifts the net magnetization vector from the z-axis toward the transverse plane. This angle of rotation of the magnetization vector, or the flip angle, is proportional to the duration and intensity of the pulse.
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Bandpass Sampling01:17

Bandpass Sampling

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In signal processing, bandpass sampling is an effective technique for sampling signals that have most of their energy concentrated within a narrow frequency band. This type of signal is known as a bandpass signal. The key principle of bandpass sampling involves sampling the signal at a rate that is greater than twice the signal's bandwidth to prevent aliasing.
A bandpass signal has a spectrum with a lower frequency limit, denoted as ω1, and an upper frequency limit, denoted as ω2....
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Active Filters01:25

Active Filters

1.0K
Active filters are electronic circuits that use operational amplifiers (op-amps), resistors, and capacitors to filter out unwanted frequency components from a signal. A first-order low-pass active filter is designed to pass signals with a frequency lower than a certain cutoff frequency and attenuate frequencies higher than that cutoff frequency. The transfer function for a first-order low-pass active filter is:
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Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

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Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
Spin decoupling is usually achieved by...
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Multiplexed sensing interrogation technique based on a flexibly switchable multi-passband RF filter by using a

Weiying Rao, Weiyu Dai, Xun Cai

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    This study introduces a novel multiplexed sensing technique using a switchable multi-passband filter and a Solc-Sagnac loop. This method enables simultaneous monitoring of multiple environmental parameters with high sensitivity and stability.

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    Area of Science:

    • Photonics
    • Optical Sensing
    • Microwave Photonics

    Background:

    • Multiplexed sensing is crucial for simultaneous environmental monitoring.
    • Existing interrogation techniques face limitations in multiplexing capacity and flexibility.
    • Polarization maintaining fiber (PMF) Solc-Sagnac loops offer potential for advanced optical filtering.

    Purpose of the Study:

    • To propose and experimentally demonstrate a novel multiplexed sensing interrogation technique.
    • To develop a flexibly switchable multi-passband microwave photonic filter (MPF) for sensing applications.
    • To enable simultaneous monitoring of multiple environmental parameters using a single interrogation system.

    Main Methods:

    • Utilized a second-order Solc-Sagnac loop as a spectrum slicer and sensing head.
    • Integrated a dispersive medium to achieve a multi-passband microwave photonic filter (MPF).
    • Experimentally applied temperature variations to different sensor heads (PMF) to validate sensing capabilities.

    Main Results:

    • Demonstrated a flexibly switchable multi-passband MPF.
    • Achieved simultaneous temperature sensing using two distinct sensor heads.
    • Quantified sensitivities of -0.275 ± 0.011 MHz/℃ and -0.811 ± 0.013 MHz/℃ for the two sensor heads, respectively.
    • Observed good sensing linearity and stability.

    Conclusions:

    • The proposed technique effectively enables multiplexed sensing of environmental parameters.
    • Higher sensitivity can be achieved by increasing the length of the sensing PMF.
    • Employing higher-order Solc-Sagnac loops allows for multiplexing a greater number of sensors.