Acceleration detector based on resonance light tunneling effect and detection method
A technology of tunneling effect and acceleration, which is applied in speed/acceleration/shock measurement, acceleration measurement, instruments, etc., which can solve problems affecting the measurement accuracy of accelerometers, increasing the difficulty of processing technology, and bending deformation of conductive films.
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Embodiment 1
[0065] Such as Figure 1-3 As shown, an acceleration detector based on resonant light tunneling effect, including a fixed frame 1, an elastic cantilever beam 2 and a mass block 3,
[0066] The mass block 3 is composed of a semi-cylindrical unit 4, a cuboid unit 5 and a resonance unit 6. The number of the semi-cylindrical unit 4 and the cuboid unit 5 is two, and the resonance unit 6 and two cuboid units 5 are connected to form an I-shaped structure. The two cuboid units 5 are two parallel beams of I-shaped structure, the square faces of the two semi-cylindrical units 4 are opposite and connected by the I-shaped structure, the resonance unit 6 is parallel to the square faces of the semi-cylindrical unit 4; the semi-cylindrical unit 4. Two gaps are formed between the cuboid unit 5 and the resonant unit 6 to form two resonant cavities; the mass block 3 is formed by etching an oblong silicon chip;
[0067] There are four elastic cantilever beams 2, four elastic cantilever beams 2 ...
Embodiment 2
[0070] Select the wavelength λ of the incident light to be 1550nm, the angle between the direction of the incident light and the positive direction of the X-axis is always β, and the incident light is P-polarized light; the width of the resonance unit 6 is g λ =15.622μm, air layer width d λ =2280nm, the refractive index of air is 1.
[0071] Since the quality block is made of silicon, the refractive index of silicon is 3.42, so the critical angle θ is obtained according to Snell's law of refraction c is 17.0016 degrees, and this embodiment selects the initial incident angle as α 0 It is 17.9516 degrees, and the variation range of displacement is controlled within 150nm.
[0072] According to the above conditions, through simulation calculation, the change curve (fitting curve) of light transmission intensity T with angle change Δθ is as follows Figure 7 As shown, the change curve of the light transmission intensity T with the displacement ΔH is as follows Figure 8 shown....
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