A laser vibrometer

Abstract

The present invention belongs to the technical field of vibration measuring equipment, and specifically relates to a laser vibrometer, comprising a fixed bracket and a vibrometer body, wherein the vibrometer body is detachably mounted on the fixed bracket, and further comprises a water tank, a monitoring module and an auxiliary lamp, wherein the water tank is detachably arranged on the vibrometer body, an opening is provided on the top of the water tank, the monitoring module comprises a floating block, a connecting rod, a metal ball and an induction switch, wherein the floating block is located in the water tank, one end of the connecting rod passes through the opening and is fixedly connected to the floating block, and the other end is fixedly connected to the metal ball, the induction switch is fixedly arranged on the vibrometer body and cooperates with the metal ball, the auxiliary lamp is fixedly arranged on one side of the scanning head of the vibrometer body and is electrically connected to the induction switch, and the present invention effectively solves the problem that the laser vibrometer is affected by the external environment and the vibration of the laser vibrometer itself during operation, thereby causing inaccurate measurement results.

Description

Technical Field

[0001] The present invention belongs to the technical field of vibration measuring equipment, and specifically relates to a laser vibrometer. Background Art

[0002] Laser vibrometers are based on the principle of optical interference and use a non-contact measurement method. They can be used in tasks that many other vibration measurement methods cannot measure. Both frequency and phase response are excellent, sufficient for high-precision, high-speed measurement applications. Using non-contact measurement methods, it is also possible to detect vibrations on liquid surfaces or very small objects, and at the same time, it can make up for the defect that contact measurement methods cannot measure large amplitude vibrations.

[0003] However, in the actual measurement process, the size of the glass and metal bracket used for the laser tube inside the laser vibrometer changes with temperature, which causes frequency drift. In addition, vibrations in the external environment during measurement may also cause the vibrometer to vibrate, causing the optical length of the resonant cavity to change, which in turn causes frequency drift, ultimately leading to inaccurate measurement results.

[0004] The invention patent with application number CN201910434648.2 discloses a laser vibrometer that can eliminate stray light from the emission system, thereby improving the detection capability and accuracy of the system.

[0005] However, in the actual measurement environment, some machines or mechanisms may cause vibrations in the site where the equipment to be measured is located when they are working, and the laser vibrometer itself may also vibrate. Such vibrations will also affect the measurement of the laser vibrometer, but such vibrations are often ignored, and there are currently no related improvements. Based on this, a vibrometer is needed that can eliminate or sense the vibration of the laser vibrometer itself or external vibrations, so as to obtain more accurate measurement data. Summary of the invention

[0006] The purpose of this solution is to provide a laser vibrometer to solve the problem that the laser vibrometer is affected by the external environment and the vibration of the laser vibrometer itself during operation, thereby causing inaccurate measurement results.

[0007] In order to achieve the above-mentioned purpose, the present scheme provides a laser vibrometer, comprising a fixed bracket and a vibrometer body, wherein the vibrometer body can be detachably mounted on the fixed bracket, and further comprising a water tank, a monitoring module and an auxiliary light, wherein the water tank can be detachably arranged on the vibrometer body, and an opening is provided on the top of the water tank, wherein the monitoring module comprises a floating block, a connecting rod, a metal ball and an induction switch, wherein the induction switch is arranged on the vibrometer body, and the induction switch is cylindrical, and the floating block is located in the water tank, one end of the connecting rod passes through the opening and is fixedly connected to the floating block, and the other end is fixedly connected to the metal ball, and the metal ball is located inside the cylindrical induction switch, and the auxiliary light is fixedly arranged on one side of the scanning head of the vibrometer body and is electrically connected to the induction switch.

[0008] The principle of this scheme is that when the main body of the laser vibrometer vibrates, the solution in the water tank shakes, driving the float to move, and then causing the metal ball fixed to the other end of the connecting rod to shift. The induction switch is cylindrical, and the induction switch can be triggered when the metal ball moves up and down or left and right, so that the auxiliary light is powered on. At this time, the auxiliary light emits rays to the object to be measured, causing the data measured by the laser vibrometer to deviate significantly, indicating that this section of data is inaccurate. The staff does not record this section of data when recording the data.

[0009] The technical effect of this solution is that when the vibration meter body vibrates, the auxiliary light emits rays to cause obvious deviations in this section of data, which can effectively prevent the staff from mistakenly collecting this section of data when the data deviation is not obvious due to slight vibration of the vibration meter, resulting in inaccurate final measurement results; during the operation of the vibration meter body, the temperature of the vibration meter body may rise due to the external ambient temperature or the heat of its own components, which in turn leads to inaccurate measurement results. The water tank can absorb part of the external heat of the vibration meter body to achieve the purpose of cooling.

[0010] Furthermore, the vibration meter body is also provided with a limit column matched with the connecting rod, and the limit column is located between the floating block and the metal ball. The limit column can ensure that the metal ball always moves within the sensing range of the sensing switch, so as to avoid the induction switch being unable to sense the metal ball when the vibration amplitude of the vibration meter body is too large.

[0011] Furthermore, two water tanks and monitoring modules are provided, and are symmetrically arranged on both sides of the vibration meter body. Such an arrangement can keep the vibration meter balanced on the fixed bracket; the two water tanks can achieve better heat dissipation effect; and when one monitoring module is damaged, the detection module on the other side can continue to work, preventing the staff from failing to discover the sudden damage of the detection module in time, thereby measuring inaccurate data.

[0012] Furthermore, a temperature detector is provided inside the water tank. When using a laser vibrometer, the temperature of the solution can be detected by the temperature detector, and when the temperature of the vibrometer is too high, it can be discovered by the staff in time, so as to avoid inaccurate data caused by measuring when the temperature is too high.

[0013] Furthermore, the water tank is also provided with a cooling module, which is electrically connected to the temperature detector. When the temperature detector detects that the temperature is too high, the solution in the water tank can be cooled by the cooling device.

[0014] Furthermore, a warning light is also provided on the main body of the vibrometer, and the warning light is electrically connected to the induction switch. With such a configuration, the laser vibrometer can be monitored by the staff in time when vibration occurs, and corresponding measures can be taken.

[0015] Furthermore, a battery for supplying power to the monitoring module and the auxiliary light is arranged on the fixed bracket, and a push switch is arranged at the bottom of the fixed bracket, and the push switch is electrically connected to the monitoring module and the auxiliary light. Only when the fixed bracket is placed on the ground and the push switch is turned on, the monitoring module and the auxiliary light are powered on. The setting of the battery and the push switch can independently control the on and off of the detection module and the auxiliary light to prevent false triggering of the mobile vibration meter; and the auxiliary light is powered by a battery, which is direct current; the vibration meter is usually powered by AC power. The different power supply modes make the light source frequencies emitted by the auxiliary light and the vibration meter different, and then when the auxiliary light is working, the difference between the measured data and the normal data is more obvious, and it is easier to exclude abnormal data. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic structural diagram of an embodiment of the present invention. DETAILED DESCRIPTION

[0017] The following is a further detailed description through specific implementation methods:

[0018] The figure marks in the drawings of the specification include: 1. fixed bracket; 2. vibration meter body; 3. water tank; 4. floating block; 5. metal ball; 6. induction switch; 7. limit column; 8. auxiliary light; 9. warning light; 10. battery; 11. push switch.

[0019] The embodiment is basically as shown in the attached Figure 1 As shown:

[0020] It includes a fixed bracket 1, which is specifically retractable. When in use, the height of the fixed bracket 1 can be adjusted according to the height of the object to be measured, and then locked by tightening bolts. The top of the fixed bracket 1 is connected to a vibrometer body 2 by threads. The front end of the vibrometer body 2 is a scanning head, and the rear end is a power interface. A battery 10 is installed inside the fixed bracket 1; a push switch 11 for controlling the on and off of the monitoring module and the auxiliary light is provided at the bottom of the fixed bracket 1.

[0021] It also includes a water tank 3, specifically, there are two water tanks 3, which are fixed to both sides of the vibration meter body 2 by straps, and floating blocks 4 are placed in the two water tanks 3, wherein the floating blocks 4 are bonded to the connecting rod, and an opening that matches the connecting rod is opened on the top of the water tank 3. Limiting columns 7 are bonded to the upper part of the water tank 3 on both sides of the vibration meter, and the specific limiting columns 7 have through holes in the vertical direction. After one end of the connecting rod is bonded to the floating block 4, the other end first passes through the opening, and then passes through the through hole of the limiting column 7 and is welded with a metal ball 5. An induction switch 6 is also bonded to the vibration meter body 2. The specific induction switch 6 is a pressure induction switch 6, which is cylindrical in shape and has a through hole near the water tank 3. The connecting rod passes through the through slot so that the metal ball 5 is located inside the cylindrical pressure sensing switch 6 but does not contact the pressure sensing switch 6. A warning light 9 is clamped on the top of the vibrometer body 2. The warning light 9 is electrically connected to the sensing switch 6 to ensure that when the vibrometer body 2 vibrates, the sensing switch 6 energizes the warning light 9 and emits light to remind the staff; an auxiliary light 8 is bonded to the front end of the vibrometer body 2 near the scanning head, and the auxiliary light 8 is electrically connected to the sensing switch 6 to ensure that when the vibrometer body 2 vibrates, the sensing switch 6 energizes the auxiliary light 8 and emits a light beam to interfere with the measurement of the vibrometer, thereby obtaining a vibration wave amplitude that is significantly different from normal data.

[0022] In order to avoid the influence of temperature on the measurement accuracy of the laser vibrometer, a temperature detector and a cooling module are also connected to the outside of the water tank 3. Specifically, the temperature detector and the cooling module are electrically connected. After the temperature detector measures the temperature data, the data is transmitted to the cooling module. The cooling module determines whether cooling is needed and then takes measures.

[0023] During specific operation, the vibration meter body 2 is installed on the fixed bracket 1, and then the fixed bracket 1 is placed on the ground. At this time, the push switch 11 at the bottom of the fixed bracket 1 is turned on, so that the monitoring module and the auxiliary light 8 are powered on, and the vibration meter body 2 is powered on to start working. When the vibration meter body 2 is vibrated by environmental vibration or vibration of the internal components of the vibration meter body 2, the water inside the water tank 3 begins to shake, which causes the floating block 4, the connecting rod and the metal ball 5 to shake together. At this time, the metal ball 5 continuously hits the pressure sensing switch 6 during the shaking process, and the pressure sensing switch 6 turns on the warning light 9 after being hit. The auxiliary lamp 8 is powered on, and the warning lamp 9 lights up to remind the staff that the vibrometer is in a vibrating state. The auxiliary lamp 8 emits a light beam to the object to be measured. At this time, the light beam emitted by the auxiliary lamp 8 and the laser emitted by the vibrometer itself act on the object to be measured together. Since the power supply of the vibrometer is AC, the auxiliary lamp 8 is powered by a battery 10, and the battery is DC, the frequency of the light source emitted by the auxiliary lamp 8 and the vibrometer is greatly different. The data measured by the vibrometer deviates significantly from the normal data. When recording and analyzing the data, the staff will exclude the data with obvious deviations and obtain the data of the normal data segment.

[0024] After the vibration meter has been working for a period of time, if the ambient temperature rises or the equipment generates heat after long-term operation, causing the water temperature in the water tank 3 to rise, the temperature monitor measures the outlet water temperature and transmits the temperature data to the background and the cooling module. The staff can monitor the water temperature in real time to determine whether the vibration meter measurement data is affected by the temperature. When the temperature is higher than the set value, the cooling module cools the water until it returns to the initial temperature.

[0025] When the vibration meter is used up or needs to be moved, the vibration meter is picked up, and the fixed bracket 1 leaves the ground, the push switch 11 at the bottom of the fixed bracket 1 is disconnected, and the monitoring module and the auxiliary light 8 do not work, thereby avoiding the alarm being triggered by mistake or the auxiliary light 8 being turned on during the movement of the vibration meter.

[0026] The above is only an embodiment of the present invention, and the common knowledge such as the known specific structure and characteristics in the scheme is not described in detail here. It should be pointed out that for those skilled in the art, several deformations and improvements can be made without departing from the structure of the present invention, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A laser vibrometer, comprising a fixed support (1) and a vibrometer body (2), wherein the vibrometer body (2) is detachably mounted on the fixed support (1), and characterized in that: The invention also comprises a water tank (3), a monitoring module and an auxiliary light (8); the water tank (3) is detachably arranged on the vibration meter body (2); an opening is provided on the top of the water tank (3); the monitoring module comprises a floating block (4), a connecting rod, a metal ball (5) and an induction switch (6); the induction switch (6) is arranged on the vibration meter body (2); the induction switch (6) is cylindrical; the floating block (4) is located in the water tank (3); one end of the connecting rod passes through the opening and is fixedly connected to the floating block (4); the other end of the connecting rod is fixedly connected to the metal ball (5); the metal ball (5) is located inside the cylindrical induction switch (6); the auxiliary light (8) is fixedly arranged on one side of the scanning head of the vibration meter body (2) and is electrically connected to the induction switch (6).

2. A laser vibrometer according to claim 1, characterized in that: The vibration meter body (2) is also provided with a limit column (7) matched with the connecting rod, and the limit column (7) is located between the floating block (4) and the metal ball (5).

3. A laser vibrometer according to claim 1, characterized in that: The water tank (3) and the monitoring module are both provided in pairs and are symmetrically arranged on both sides of the vibration meter body (2).

4. A laser vibrometer according to claim 1, characterized in that: A temperature detector is arranged inside the water tank (3).

5. A laser vibrometer according to claim 4, characterized in that: The water tank (3) is also provided with a cooling module, and the cooling module is electrically connected to the temperature detector.

6. The laser vibrometer according to claim 1, characterized in that: A warning light (9) is also provided on the vibration meter body (2), and the warning light (9) is electrically connected to the induction switch (6).

7. The laser vibrometer according to claim 1, characterized in that: A battery (10) for supplying power to the monitoring module and the auxiliary light (8) is arranged on the fixing bracket (1), and a push switch (11) is arranged at the bottom of the fixing bracket (1), wherein the push switch (11) is electrically connected to the monitoring module and the auxiliary light (8).

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