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Identical bonds within a polyatomic group can stretch symmetrically (in-phase) or asymmetrically (out-of-phase). Similar to hydrogen bonding, these vibrations also influence the shape of the IR peak. Generally, asymmetric stretching frequencies are higher than symmetric stretching frequencies. For example, primary amines exhibit two distinct IR peaks between 3300–3500 cm−1 corresponding to the symmetric and asymmetric N-H stretching, while secondary amines exhibit a single...
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A covalently bonded heteronuclear diatomic molecule can be modeled as two vibrating masses connected by a spring. The vibrational frequency of the bond can be expressed using an equation derived from Hooke's law, which describes how the force applied to stretch or compress a spring is proportional to the displacement of the spring. In this case, the atoms behave like masses, and the bond acts like a spring.
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Thermosensation

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Peripheral thermosensation is the perception of external temperature. A change in temperature (on the surface of the skin and other tissues) is detected by a family of temperature-sensitive ion channels called Transient Receptor Potential, or TRP, receptors. These receptors are located on free nerve endings. Those detecting cold temperatures are closer to the surface of the skin than the nerve endings detecting warmth. These thermoTRP channels, while temperature selective, have relatively...
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Measurement of Vibration Detection Threshold and Tactile Spatial Acuity in Human Subjects
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Temperature-insensitive polarimetric vibration sensor.

Chunyang Han, Chenyu Zhao, Hui Ding

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    This study presents a novel optical vibration sensor. The sensor uses a unique photonic crystal fiber cantilever design for accurate, temperature-independent vibration measurements up to 5 kHz.

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    Area of Science:

    • Photonics
    • Optical Sensing
    • Materials Science

    Background:

    • Vibration measurement is crucial across various fields.
    • Existing optical vibration sensors face challenges with temperature cross-sensitivity and mechanical instability.
    • These limitations hinder reliable vibration detection.

    Purpose of the Study:

    • To develop a temperature-insensitive optical vibration sensor.
    • To overcome the limitations of conventional vibration measurement techniques.
    • To enable in-line vibration monitoring with enhanced reliability.

    Main Methods:

    • Fabrication of a cantilever from highly birefringent photonic crystal fiber via chemical etching.
    • Integration of the cantilever with a single-polarization fiber for readout.
    • Utilizing the polarization modulation of light propagating through the cantilever to detect vibration.
    • Converting polarization fluctuations into output optical power changes for demodulation.

    Main Results:

    • Demonstration of a vibration sensor with suppressed temperature-induced polarization fluctuations.
    • Achieved a linear response from 5 Hz to 5 kHz.
    • Obtained a maximum signal-to-noise ratio of 60 dB.
    • The sensor exhibited near-complete temperature independence.

    Conclusions:

    • The proposed sensor design effectively mitigates temperature cross-sensitivity.
    • The sensor provides reliable and accurate vibration measurements.
    • This technology offers a promising solution for advanced optical vibration sensing applications.