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Related Concept Videos

Pulse01:16

Pulse

2.2K
When the heart pumps blood out, arterial elastic fibers play a crucial role in sustaining a high-pressure gradient. They expand to accommodate the received blood and then recoil - a process known as the pulse that can be either manually palpated or electronically quantified. Despite a reduction in its effect with increased distance from the heart, elements of the pulse's systolic and diastolic components persist, observable even at the arteriole level.
The pulse serves as a clinical...
2.2K
Pulse01:05

Pulse

4.1K
The pulse is one of the most fundamental physiological indicators of the body's cardiovascular health. It is the rhythmic expansion and contraction of the arterial walls in response to the pressure generated by the heart's pumping action.
Pulse Rate and its Significance
Pulse rate, often measured in beats per minute (bpm), reflects the heart rate (HR), which is influenced by numerous factors such as stress, physical activity, and hormonal changes. A normal resting adult pulse rate falls...
4.1K
NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences01:17

NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences

1.8K
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.
1.8K
Pulse Oximetry01:24

Pulse Oximetry

1.4K
Pulse oximetry, or SpO2, is a non-invasive method for continuously monitoring arterial oxygen saturation (SaO2). This procedure involves attaching a probe or sensor to the patient's fingertip, forehead, earlobe, or nose bridge. The sensor works by detecting changes in oxygen saturation levels through light signals generated by the oximeter and reflected by the pulsing blood under the probe.
Purpose
Average SpO2 values are greater than 95%. If the readings fall below 90%, it indicates that...
1.4K
Regulation of Pulse01:20

Regulation of Pulse

2.3K
Pulse regulation involves physiological mechanisms that ensure adequate blood flow throughout the body. The heartbeat, regulated by the autonomic nervous system, is influenced by hormonal balance, physical activity, and emotional state.
2.3K
Pulse rhythm01:30

Pulse rhythm

1.4K
Pulse rhythm refers to the pattern of pulsations within specific intervals, offering valuable insights into the regularity or irregularity of the heart's beats as observed through the pattern of pulsation within specific intervals. A regular pulse exhibits a consistent heart rate with uniform waveforms and pulsation force, variations of which can be classified as normal, weak, or bounding.
Conversely, an irregular pulse pattern is termed dysrhythmia, stemming from disruptions in cardiac...
1.4K

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Related Experiment Video

Updated: Feb 7, 2026

Dependence of Laser-induced Breakdown Spectroscopy Results on Pulse Energies and Timing Parameters Using Soil Simulants
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Dependence of Laser-induced Breakdown Spectroscopy Results on Pulse Energies and Timing Parameters Using Soil Simulants

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Pyroelectric detection of submicrosecond laser pulses between 230 and 530 microm.

W S Zhu, J R Izatt, B K Deka

    Applied Optics
    |June 18, 2010
    PubMed
    Summary

    Lithium tantalate (LiTaO3) pyroelectric detectors show significant spectral variations due to internal reflections. These interference fringes, observed between 230-530 micrometers, impact detector performance and require careful consideration in far-infrared applications.

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    Area of Science:

    • Solid-state physics
    • Infrared spectroscopy
    • Materials science

    Background:

    • Pyroelectric detectors are crucial for infrared (IR) sensing.
    • Lithium tantalate (LiTaO3) is a common material for pyroelectric detectors.
    • Understanding spectral response is vital for accurate IR measurements.

    Purpose of the Study:

    • To measure the spectral response and responsivity of LiTaO3 pyroelectric detectors.
    • To investigate the cause of observed variations in spectral response.
    • To analyze detector performance in the far-infrared (230-530 micrometers).

    Main Methods:

    • Utilized a continuously tunable far-IR Raman laser.
    • Measured responsivity and spectral response of uncoated LiTaO3 detectors.
    • Applied Fabry-Perot etalon theory for analysis.

    Main Results:

    • Observed a periodic sequence of maxima and minima in spectral response curves.
    • Modulation factor of the spectral variations exceeded 75%.
    • Attributed these variations to interference fringes from multiple reflections within the LiTaO3 crystal.

    Conclusions:

    • Internal reflections within LiTaO3 crystals significantly affect far-IR spectral response.
    • Fabry-Perot interference explains the observed periodic spectral modulations.
    • These findings are critical for designing and calibrating LiTaO3 pyroelectric detectors for specific far-IR applications.