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Related Concept Videos

Aliasing01:18

Aliasing

263
Accurate signal sampling and reconstruction are crucial in various signal-processing applications. A time-domain signal's spectrum can be revealed using its Fourier transform. When this signal is sampled at a specific frequency, it results in multiple scaled replicas of the original spectrum in the frequency domain. The spacing of these replicas is determined by the sampling frequency.
If the sampling frequency is below the Nyquist rate, these replicas overlap, preventing the original...
263
Phase-lead and Phase-lag Controllers01:22

Phase-lead and Phase-lag Controllers

234
Understanding the working function of different types of controllers can be illustrated with practical analogies, such as adjusting a stereo's volume equalizer. Cranking up the bass involves a phase-lead controller, which functions as a high-pass filter, while increasing the treble uses a phase-lag controller, which acts as a low-pass filter. PD controllers, similar to high-pass filters, enhance the system's response to high-frequency components. PI controllers, akin to low-pass...
234
Time and frequency -Domain Interpretation of Phase-lead Control01:24

Time and frequency -Domain Interpretation of Phase-lead Control

144
Phase-lead controllers are commonly used in various control systems to enhance response speed and stability. Adjusting the brightness on a television screen offers a practical example of phase-lead control. When contrast is enhanced, a phase-lead controller is employed. Mathematically, phase-lead control is identified when the first parameter is smaller than the second.
The design of phase-lead control involves the strategic placement of poles and zeros to balance steady-state error and system...
144
Phasor Arithmetics01:13

Phasor Arithmetics

401
Phasors and their corresponding sinusoids are interrelated, offering unique insights into the behavior of alternating current (AC) circuits. One way to understand this relationship is through the operations of differentiation and integration in both the time and phasor domains.
When the derivative of a sinusoid is taken in the time domain, it transforms into its corresponding phasor multiplied by j-omega (jω) in the phasor domain, where j is the imaginary unit, and ω is the angular...
401
Time and frequency -Domain Interpretation of Phase-lag Control01:21

Time and frequency -Domain Interpretation of Phase-lag Control

155
Phase-lag controllers are widely used in control systems to improve stability and reduce steady-state errors. A dimmer switch controlling the brightness of a light bulb serves as a practical example of phase-lag control, gradually adjusting the bulb's brightness. Mathematically, phase-lag control or low-pass filtering is represented when the factor 'a' is less than 1.
Phase-lag controllers do not place a pole at zero, but instead influence the steady-state error by amplifying any...
155
Phase Contrast and Differential Interference Contrast Microscopy01:26

Phase Contrast and Differential Interference Contrast Microscopy

10.8K
Phase-Contrast Microscopes
In-phase-contrast microscopes, interference between light directly passing through a cell and light refracted by cellular components is used to create high-contrast, high-resolution images without staining. It is the oldest and simplest type of microscope that creates an image by altering the wavelengths of light rays passing through the specimen. Altered wavelength paths are created using an annular stop in the condenser. The annular stop produces a hollow cone of...
10.8K

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Quasi-light Storage for Optical Data Packets
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Phase-combining unit for aliasing suppression in an optical phased array.

Dachuan Wu, Bowen Yu, Yasha Yi

    Optics Letters
    |April 15, 2022
    PubMed
    Summary
    This summary is machine-generated.

    A novel phase-combining unit (PCU) enhances integrated optical phased array (OPA) devices for autonomous driving. This PCU effectively suppresses aliasing effects, improving light detection and ranging performance.

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    Area of Science:

    • Photonics and Optical Engineering
    • Autonomous Systems Technology

    Background:

    • Integrated optical phased arrays (OPAs) are crucial for solid-state light detection and ranging (LiDAR) in autonomous driving.
    • Existing OPA control methods face limitations in aliasing suppression.

    Purpose of the Study:

    • To propose and investigate a novel phase-combining unit (PCU) for integrated OPAs.
    • To enhance aliasing suppression capabilities in OPA devices.

    Main Methods:

    • Theoretical analysis of the PCU architecture.
    • Numerical simulations to evaluate performance.
    • Experimental proof-of-concept validation.

    Main Results:

    • The PCU enables N phase shifters to control 2N-1 emitters, improving control efficiency.
    • Simulations demonstrated a maximum grating lobe suppression of 92.54%.
    • Experiments achieved an average of 53.76% suppression for a single grating lobe.

    Conclusions:

    • The PCU is a universal unit for aliasing suppression in integrated OPAs.
    • This technology offers significant improvements for LiDAR in autonomous vehicles.