Magnetofluid inclination angle sensor
A technology of tilt angle sensor and magnetic fluid, applied in the field of sensors, can solve problems such as nonlinear degree change, and achieve the effect of improving service life, solving contact wear and ensuring accuracy
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Embodiment 1
[0024] figure 1 It is a front view of a magnetic fluid inclination angle sensor provided in Embodiment 1 of the present invention. This embodiment is applicable to scenarios such as monitoring and measuring the inclination angle of large equipment buildings, and observing the inclination of mountains or the earth. The magnetic fluid tilt angle sensor can specifically include:
[0025] The glass tube 120 is cylindrical, sealable, and placed horizontally, and the inside of the glass tube is equipped with a magnetic fluid 130;
[0026] Coils 111-114, 4 coils are wound on the outer wall of the glass tube 120 in pairs, and the coils 111 and 113, 112 and 114 in each coil group are closely arranged, and there is a distance between the two groups of coil groups. The two coils 111 and 112 closest to the two ends of the tube 120 are connected in series, and AC power is added to the ends of the two coils with the same name; the voltage difference between the two coils 113 and 114 near t...
Embodiment 2
[0038] Figure 5 It is a front view of a magnetic fluid inclination angle sensor provided in Embodiment 2 of the present invention, Figure 6 It is the left side view of the magnetic fluid inclination angle sensor of the second embodiment of the present invention. On the basis of the first embodiment, the volume of the magnetic fluid 130 is half of the volume of the glass tube 120, so that when the tangent of the glass tube 120 inclination angle α is equal to the glass tube When the ratio of the diameter of the tube 120 to the length l of the glass tube 120 is equal, the magnetic fluid 130 is just inclined to the diagonal of the glass tube 120 .
[0039] According to the working principle of the magnetic fluid inclination angle sensor of the first embodiment, the liquid level of the magnetic fluid 130 is h=r, wherein the inner diameter r1 of the coil is approximately equal to the radius r of the glass tube, ie r1≈r. When the tangent of the glass tube 120 inclination angle α ...
Embodiment 3
[0048] Figure 7 It is a phase-sensitive rectifier circuit. On the basis of the above-mentioned embodiments, the output voltage of the magnetic fluid tilt angle sensor is low, which is difficult to detect, and can only reflect the magnitude of the tilt angle, but cannot determine the direction of the tilt angle. After adding the phase-sensitive rectification circuit, assuming that the left end of the glass tube 120 is downward and the right end is upward, the impedance of the upper coil 1 among the two coils of the phase-sensitive rectification circuit becomes larger, and the impedance of the lower coil 2 becomes smaller, regardless of the input voltage Whether it is in a positive half cycle or a negative half cycle, the amplitude of the output voltage Vout is always positive; and when the left end of the glass tube 120 is upward and the right end is inclined downward, the impedance of the upper coil 1 among the two coils of the phase-sensitive rectification circuit becomes sma...
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