All-fibre laser Doppler three-dimensional vibration meter
A Doppler three-dimensional, vibrometer technology, applied in instruments, measuring devices, measuring ultrasonic/sonic/infrasonic waves, etc., can solve the problems of expensive, complicated operation, and bulky, and achieve compact structure, low price, and adjustable convenient effect
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Embodiment 2
[0030] Embodiment two: On the basis of embodiment one, as figure 2 As shown, the combined fiber optic probe includes a first probe, a second probe 2, a third probe 3, a fourth probe 4, and a fifth probe 5. The first probe 1, the second probe 2, the third probe 3, the Four probes 4 and the fifth probe 5 are fixed on the support, the first probe 1, the second probe 2, the third probe 3, the fourth probe 4, and the fifth probe 5 are located on a plane perpendicular to the Z direction, and the second The probe 2, the third probe 3, the fourth probe 4, and the fifth probe 5 are arranged symmetrically around the first probe 1, respectively, and the second probe 2, the first probe 1, and the fourth probe 4 form a line centered on the first probe 1. point; the third probe 3, the first probe 1, and the fifth probe 5 form a straight line with the first probe 1 as the midpoint, and the straight line formed by the third probe 3, the first probe 1, and the fifth probe 5 is the same as Th...
Embodiment 3
[0055] Embodiment 3, on the basis of Embodiment 2, if the vibrating surface is an ideal mirror surface, it is impossible for the second probe 2 and the fourth probe 4 to receive the reflected light of the laser emitted by the first probe 1 at the same time. But in fact, there is no ideal mirror surface. The laser emitted from the first probe 1 is irradiated on the vibrating surface, and the vibrating surface will reflect light in all directions. Both the second probe 2 and the second probe 4 can receive part of the reflected light, or scattered light. .
[0056]The angle θ between the second probe 2 and the fourth probe 4 along the Z direction, and the angle θ between the third probe 3 and the fifth probe 5 along the Z direction should be selected appropriately, and the angle θ becomes larger. The second probe 2 and the fourth probe 4. The received light will decrease, the frequency of the interference signal will increase, and the included angle θ will become smaller. The lig...
Embodiment 4
[0057] Embodiment 4: On the basis of embodiment three, the first optical fiber signal processing module, the second optical fiber signal processing module, the third optical fiber signal processing module, and the fourth optical fiber signal processing module respectively include optical fiber amplifiers, i.e. erbium-doped optical fiber amplifiers. It is used to amplify the optical fiber signal; the optical fiber filter is used to filter the output signal of the optical fiber amplifier; the optical fiber attenuator is used to attenuate the output signal of the optical fiber filter; The signal is converted into a photoelectric signal), oscilloscope (used to display the signal processed by the photoelectric converter. The optical fiber displacement interferometer emits laser light with a wavelength of 1550nm, 1064nm or 1310nm, and the visible light laser emits laser light with a wavelength of 632nm or 532nm. The instrument and the visible light laser are connected to the two ...
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