Jitter aging device and aging method for optical resonant cavity of laser gyroscope

Abstract

The invention discloses a jittering aging device and an aging method for a laser gyroscope optical resonant cavity. The jittering aging device comprises an external jittering wheel, piezoelectric ceramics, a fixing tool, a jittering bottom plate and a control system, wherein the external shaking wheel is fixed on the shaking bottom plate; the piezoelectric ceramic is adhered to the external shaking wheel; the resonant cavity is placed on the external shaking wheel; the fixing tool is placed on the resonant cavity, and the resonant cavity is fixed on the external shaking wheel; the control system is connected with the piezoelectric ceramics and the resonant cavity electrode through wires and used for controlling the external shaking wheel to work and controlling the resonant cavity to be lightened. According to the invention, the batch quality problem caused by equipment failure in the aging process is avoided.

Description

Technical Field

[0001] The invention relates to an aging device, in particular to a jitter aging device and an aging method for a laser gyroscope optical resonant cavity. Background Art

[0002] The laser gyro resonant cavity consists of a gyro cavity, glass high-reflection diaphragms placed at the four ends, and helium-neon working gas. When the gyro discharges and excites, some of the neon atoms achieve population inversion, thereby radiating photons, which will form a closed loop between the four reflectors, and after frequency selection and amplification, form lasers. The glass high-reflection diaphragm is a key component in forming an optical closed loop. According to the failure rate curve, the working state of the glass high-reflection diaphragm is unstable in the early stage. In order to make the laser gyro quickly enter the stage where it can work stably, the laser gyro needs to be lit for a long time and with a large current, so that the reflector diaphragm can achieve a rapid aging effect under the bombardment of the laser.

[0003] The closed optical path formed by the laser gyro resonant cavity is a circular optical path, so there are two laser beams propagating in the clockwise and counterclockwise directions in the optical path. The two laser beams will interfere with each other on the reflector diaphragm. When the laser gyro is stationary, the interference fringes are also stationary at a certain position on the reflector diaphragm. The light intensity of the bright area of ​​the interference fringes is relatively large. Long-term exposure will damage the reflective film at that position, causing uneven loss of the film area, resulting in a larger lock area of ​​the laser gyro, affecting the performance of the instrument. According to the Sagnac effect, when the laser gyro is in a rotating environment, the frequency of the two clockwise and counterclockwise laser beams will change with the rotation speed, and the light intensity distribution of the interference fringes on the film area will change with the change of the laser frequency, so that each area of ​​the reflective film is evenly lost, and finally a stable output is obtained.

[0004] At present, the aging method of laser gyroscope is rotation aging, which is as follows: several laser gyroscope optical resonant cavities are placed outside a large circular rotation aging table, and several high-voltage power supplies are placed in the center of the rotation aging table. The high-voltage power supplies are turned on, the laser gyroscope is lit, and the rotation aging table is turned on. The rotation aging table rotates in a single direction or back and forth, and the rotation aging process begins. Since this method is a batch production, it has extremely high requirements for equipment stability and reliability. Once the equipment is abnormal, it will cause batch quality problems in the laser gyroscope optical resonant cavity; since the laser gyroscope has a lock area, sufficient angular velocity is required to change the laser frequency, and rotation aging is different from the jitter state in the actual work of the laser gyroscope. The rotation axis of the rotation aging table is located at the center of the turntable, and the laser gyroscope resonant cavity is placed outside the turntable. The actual angular velocity of each laser gyroscope resonant cavity is jointly acted by the rotation aging table and the earth. In order to make the laser gyroscope produce enough angular velocity to get out of the lock, the rotation aging table needs to use a larger rotation speed for rotation aging, which has high requirements for the performance and safety of the rotation aging equipment; the rotation aging equipment adopts a mechatronic design, occupies a large area, and has strict requirements on the production site. Summary of the invention

[0005] The technical problem solved by the present invention is: to overcome the deficiencies of the prior art and to provide a jitter aging device and an aging method for a laser gyroscope optical resonant cavity, thereby avoiding batch quality problems caused by equipment failure during the aging process.

[0006] The technical solution of the present invention is:

[0007] The invention discloses a jitter aging device for an optical resonant cavity of a laser gyroscope, comprising: an external jitter wheel, piezoelectric ceramics, a fixing tool, a jitter base plate and a control system; wherein the external jitter wheel is fixed on the jitter base plate; the piezoelectric ceramics are bonded to the external jitter wheel; the resonant cavity is placed on the external jitter wheel; the fixing tool is placed on the resonant cavity to fix the resonant cavity on the external jitter wheel; the control system is connected to the piezoelectric ceramics and the resonant cavity electrodes through a wire, and is used to control the operation of the external jitter wheel and the lighting of the resonant cavity.

[0008] Furthermore, in the above device, the piezoelectric ceramic includes: a plurality of drive plates and feedback plates; wherein the drive plates are used to drive the external shaking wheel and the resonant cavity to shake; and the feedback plates are used to feedback the shaking state of the external shaking wheel.

[0009] Furthermore, in the above-mentioned device, the control system includes: a signal output module, a real-time monitoring module and a high-voltage power supply module; wherein the signal output module is connected to the driving plate through a wire, and outputs a sinusoidal wave or square wave signal, so that the driving plate vibrates according to the frequency of the output signal; the real-time detection module is connected to the feedback plate through a wire, and detects the amplitude of the feedback signal generated by the forced vibration of the feedback plate; the high-voltage power supply module is connected to the resonant cavity electrode through a high-voltage wire, and outputs DC high voltage electricity to the electrode to ionize and break down the working gas in the resonant cavity and maintain it in a glow discharge state.

[0010] Furthermore, in the above device, the resonant cavity coincides with the central axis of the external shaking wheel.

[0011] Furthermore, in the above device, the three electrodes of the resonant cavity are connected to a high-voltage power supply module via wires.

[0012] Furthermore, in the above-mentioned device, the external shaking wheel includes an inner ring, an outer ring and a plurality of spokes; wherein, the outer ring and the inner ring are connected by a plurality of evenly distributed spokes; the resonant cavity is fixed on the inner ring; the piezoelectric ceramics are bonded to both sides of each spoke by epoxy resin; and the outer ring is fixed on the shaking base plate.

[0013] Furthermore, in the above-mentioned device, the shaking base plate meets the specified stiffness, ensuring that the outer ring of the external shaking wheel does not displace, so that the vibration of the spokes of the external shaking wheel is completely transmitted to the inner ring, driving the resonant cavity fixed on the inner ring to produce a small reciprocating rotation with the same amplitude as the signal frequency.

[0014] Furthermore, in the above device, the signal output module outputs a variable frequency signal with a frequency of 200 to 1000 Hz to drive the spokes of the external shaking wheel to vibrate; the feedback piece of the piezoelectric ceramic undergoes forced vibration.

[0015] Furthermore, in the above-mentioned device, the real-time monitoring module adjusts the output signal frequency of the signal output module according to the amplitude of the received feedback signal, so that the output signal frequency is fixed at the resonant frequency when the feedback signal amplitude is maximum; if the feedback signal amplitude drops by more than 30%, the real-time monitoring module controls the signal output module and the high-voltage power supply module to stop working, and starts the sound and light alarm at the same time.

[0016] The present invention discloses a jitter aging method for a laser gyroscope optical resonant cavity using a jitter aging device for the laser gyroscope optical resonant cavity, comprising:

[0017] Fix the resonant cavity to the external shaking wheel through a fixing fixture, and connect the line between it and the shaking control system;

[0018] The signal output module applies a variable frequency sine wave or square wave voltage to the piezoelectric ceramic drive sheet, so that the external shaking wheel drives the resonant cavity to shake. The real-time monitoring module adjusts the signal frequency parameters of the signal output module according to the amplitude of the received signal from the piezoelectric ceramic feedback sheet, so that the external shaking wheel works at the resonant frequency.

[0019] After the external jitter wheel works at the resonant frequency, the high-voltage power supply module is turned on and the gyro is lit. The gyro working current is adjusted according to the process and the jitter aging begins.

[0020] The real-time monitoring module receives the signal from the piezoelectric ceramic feedback piece and monitors the jitter state of the laser gyro resonant cavity. When the jitter state is abnormal, the real-time monitoring module will control the high-voltage power supply module to cut off the power supply and start the sound and light alarm to prevent the gyro from emitting light in the static state.

[0021] The beneficial effects of the present invention and the prior art are:

[0022] (1) The present invention adopts a highly reliable independent design. The jitter mechanism of the jitter aging device has a simple structure, no mechanical moving parts, and high device reliability. Each jitter aging device is equipped with a laser gyro optical resonator, and the jitter control system is independently controlled one-to-one, thereby avoiding batch quality problems caused by equipment failure during the aging process;

[0023] (2) The present invention adopts an integrated modular design, integrating the signal output module, the real-time monitoring module and the high-voltage power supply module into a control system. Multiple control systems can be placed in one cabinet, without the need to use a rotating aging table equipment with a large floor space, thus saving production space, reducing costs and improving production efficiency;

[0024] (3) The present invention adopts a digital intelligent design, and monitors the shaking state through a real-time monitoring module. When the shaking stops, the real-time monitoring module controls the high-voltage power supply module to stop supplying power at the same time, which effectively avoids damage to the film area of ​​the resonant cavity reflector and improves the safety of the aging process;

[0025] (4) The present invention is designed based on the actual working state of the laser gyroscope. When the laser gyroscope is jittered and aged, it is in a high-frequency and small-amplitude rotation state, which can ensure that the angular velocity of the resonant cavity meets the unlocking requirement. The central axis of the jitter aging device coincides with the sensitive axis of the laser gyroscope product, which is more in line with the actual working state of the laser gyroscope, and the aging effect is more in line with product requirements.

[0026] (5) The device of the present invention integrates the signal output module, the real-time monitoring module and the high-voltage power supply module into a control system, making the device miniaturized, integrated and intelligent, and realizing functions such as automatic control of the jitter frequency, real-time monitoring of the jitter aging state, and automatic start and stop of the high-voltage power supply; the control system and the jitter aging device are separated, and the jitter aging device has no mechanical moving parts, thereby improving the reliability of the jitter aging device;

[0027] (6) Each jitter device of the present invention is responsible for the jitter aging of the optical resonant cavity of a laser gyroscope, which can avoid batch quality problems. The angular velocity generated by the jitter aging is much larger than the angular velocity of the rotating aging table, ensuring that the laser gyroscope can be locked, and the central axis of the jitter aging device coincides with the sensitive axis of the laser gyroscope product, so that the aging effect is more in line with the product requirements of the laser gyroscope. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 is a side view of the jitter aging device of the present invention;

[0029] Figure 2 is a top view of the jitter aging device of the present invention;

[0030] Figure 3 It is a block diagram of the laser gyro jitter aging control system of the present invention;

[0031] Figure 4 It is a flow chart of the jitter aging method of the present invention. DETAILED DESCRIPTION

[0032] The present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0033] like Figure 1 and 2 As shown, the present invention discloses a jitter aging device for a laser gyroscope optical resonant cavity, comprising: an external jitter wheel 3, piezoelectric ceramics 2, a fixing tool 5, a jitter base plate 1 and a control system; wherein, the external jitter wheel 3 is fixed on the jitter base plate 1; the piezoelectric ceramics 2 are bonded to the external jitter wheel 3; the resonant cavity 4 is placed on the external jitter wheel 3; the fixing tool 5 is placed on the resonant cavity 4 to fix the resonant cavity 4 on the external jitter wheel 3; the control system is connected to the piezoelectric ceramics 2 and the electrodes of the resonant cavity 4 through a wire, and is used to control the operation of the external jitter wheel 3 and the lighting of the resonant cavity 4.

[0034] Preferably, the piezoelectric ceramic 2 includes: a plurality of drive plates and feedback plates; wherein the drive plates are used to drive the external shaking wheel 3 and the resonance cavity 4 to shake; and the feedback plates are used to feed back the shaking state of the external shaking wheel 3 .

[0035] like Figure 3 As shown, preferably, the control system includes: a signal output module, a real-time monitoring module and a high-voltage power supply module; wherein the signal output module is connected to the driving plate through a wire, and outputs a sine wave or square wave signal, so that the driving plate vibrates according to the frequency of the output signal; the real-time detection module is connected to the feedback plate through a wire, and detects the amplitude of the feedback signal generated by the forced vibration of the feedback plate; the high-voltage power supply module is connected to the electrode of the excited resonance cavity 4 through a high-voltage wire, and outputs DC high voltage to the electrode to ionize and break down the working gas in the resonance cavity 4 and maintain it in a glow discharge state.

[0036] Preferably, the resonance cavity 4 coincides with the central axis of the external shaking wheel 3 .

[0037] Preferably, the three electrodes of the resonant cavity 4 are connected to the high-voltage power supply module through wires.

[0038] Preferably, the external shaking wheel 3 includes an inner ring, an outer ring and a plurality of spokes; wherein the outer ring and the inner ring are connected by a plurality of evenly distributed spokes; the resonant cavity 4 is fixed on the inner ring; the piezoelectric ceramic 2 is bonded to both sides of each spoke by epoxy resin; and the outer ring is fixed on the shaking base plate 1.

[0039] Preferably, the shaking base plate 1 meets the specified stiffness to ensure that the outer ring of the external shaking wheel 3 does not displace, so that the vibration of the spokes of the external shaking wheel 3 is completely transmitted to the inner ring, driving the resonance cavity 4 fixed on the inner ring to produce a small reciprocating rotation with the same amplitude as the signal frequency.

[0040] Preferably, the signal output module outputs a variable frequency signal with a frequency of 200 to 1000 Hz to drive the spokes of the external shaking wheel 3 to vibrate; the feedback piece of the piezoelectric ceramic 2 undergoes forced vibration.

[0041] Preferably, the real-time monitoring module adjusts the output signal frequency of the signal output module according to the amplitude of the received feedback signal, so that the output signal frequency is fixed at the resonant frequency when the feedback signal amplitude is maximum; if the feedback signal amplitude drops by more than 30%, the real-time monitoring module controls the signal output module and the high-voltage power supply module to stop working, and starts the sound and light alarm at the same time.

[0042] like Figure 4 As shown, the present invention discloses a jitter aging method for a laser gyroscope optical resonant cavity using a jitter aging device for a laser gyroscope optical resonant cavity, comprising:

[0043] Fix the resonant cavity 4 on the external shaking wheel 3 through the fixing fixture 5, and connect the line between the resonant cavity 4 and the shaking control system;

[0044] The signal output module applies a variable frequency sine wave or square wave voltage to the piezoelectric ceramic drive sheet, so that the external shaking wheel 3 drives the resonant cavity 4 to shake. The real-time monitoring module adjusts the signal frequency parameters of the signal output module according to the received signal amplitude of the piezoelectric ceramic feedback sheet, so that the external shaking wheel 3 works at the resonant frequency;

[0045] After the external jitter wheel 3 works at the resonant frequency, the high-voltage power supply module is turned on and the gyroscope is lit. The gyroscope working current is adjusted according to the process and the jitter aging begins.

[0046] The real-time monitoring module receives the signal from the piezoelectric ceramic feedback piece and monitors the jitter state of the laser gyro resonant cavity. When the jitter state is abnormal, the real-time monitoring module will control the high-voltage power supply module to cut off the power supply and start the sound and light alarm to prevent the gyro from emitting light in the static state.

[0047] Example

[0048] The jitter aging device in this embodiment is as follows Figure 1 and Figure 2 As shown:

[0049] The external jitter wheel 3 adopts an inner and outer ring design, which is connected by six spokes, and the spokes are evenly distributed in the radial direction; piezoelectric ceramics 2 with different polarities are bonded on both sides of each spoke, a total of twelve pieces, divided into eleven drive pieces and one feedback piece, the drive piece is connected in series to the signal output module 9 with a wire, and the feedback piece is connected to the real-time monitoring module 10 with a wire; the outer ring of the external jitter wheel 3 is fixed to the jitter base plate 1 with six screws, and the laser gyroscope optical resonant cavity 4 is fixed to the inner ring of the external jitter wheel 3 by a fixing tool 5 and screws, so that the resonant cavity 4 coincides with the central axis of the external jitter wheel 3, and the three electrodes are connected to the high-voltage power supply module 11 with wires.

[0050] The jitter aging control system of the present invention is as follows Figure 3 As shown:

[0051] The signal output module 9 outputs a sine wave or square wave signal, driving the driving plate of the piezoelectric ceramic 2 to vibrate according to the signal frequency, driving the spokes of the external shaking wheel 3 to vibrate at the same frequency. Since the shaking base plate 1 has sufficient rigidity, it can fix the outer ring of the external shaking wheel 3 without displacement, so that the vibration of the spokes is completely transmitted to the inner ring, driving the laser gyroscope optical resonant cavity 4 fixed on the inner ring to produce a small reciprocating rotation with the same frequency as the signal, which is manifested macroscopically as the shaking of the resonant cavity.

[0052] The real-time monitoring module 10 receives the signal generated by the feedback sheet and regulates the signal output module 9 and the high-voltage power supply module 11. When the jitter aging begins, the signal output module 9 outputs a variable frequency signal with a frequency of 200-1000Hz to drive the spokes of the external jitter wheel 3 to vibrate, and the feedback sheet of the piezoelectric ceramic 2 is forced to vibrate. According to the piezoelectric effect, a sine wave or square wave signal with the same frequency as the spoke vibration and an amplitude that varies with the spoke vibration amplitude is generated. The real-time monitoring module 10 regulates the output signal frequency of the signal output module 9 according to the amplitude of the received feedback signal, so that the output signal frequency is fixed at the maximum feedback signal amplitude, that is, the resonance frequency, and at the same time starts the high-voltage power supply module 11 to light up the laser gyro optical resonant cavity 4; when the jitter aging is in progress, the real-time monitoring module 10 monitors the feedback signal. If the feedback signal amplitude drops by more than 30%, the real-time monitoring module 10 will control the signal output module 9 and the high-voltage power supply module 11 to stop working, and at the same time start the sound and light alarm.

[0053] The high-voltage power supply module 11 outputs a DC high voltage to ionize and break down the working gas in the laser gyro optical resonant cavity 4 and maintain it in a glow discharge state.

[0054] The jitter aging operation process of the present invention is as follows Figure 4 Shown: assembling the gyro and the jitter aging device; debugging the jitter parameters; lighting up the gyro jitter aging; and monitoring the jitter status.

[0055] Step 1, assembling the laser gyro and the jitter aging device: first, fix the laser gyro optical resonant cavity 4 on the external jitter wheel 3 through the fixing fixture 5, and connect the line between the jitter control system.

[0056] Step 2, jitter parameter debugging: the signal output module 9 applies a variable frequency sinusoidal wave or square wave voltage to the piezoelectric ceramic 2 driving plate, so that the external jitter wheel 3 drives the gyroscope resonant cavity 4 to jitter, and the real-time monitoring module 10 automatically debugs the signal frequency parameters of the signal output module 9 according to the received signal amplitude of the piezoelectric ceramic 2 feedback plate, so that the external jitter wheel 3 works at the resonant frequency.

[0057] Step 3, lighting up the gyro for shaking and aging: After the external shaking wheel 3 works at the resonance frequency, the high-voltage power supply module 11 is turned on and lights up the gyro, and the gyro working current is adjusted according to the process to start shaking and aging.

[0058] Step 4, jitter state monitoring: the real-time monitoring module 10 receives the feedback signal of the piezoelectric ceramic 2 and monitors the jitter state of the laser gyro resonant cavity 4. When the jitter state is abnormal, the real-time monitoring module 10 will control the high-voltage power supply module 11 to cut off the power supply and start the sound and light alarm to prevent the gyro from emitting light in the static state.

[0059] Although the content of the present invention has been described in detail through the above preferred embodiments, it should be appreciated that the above description should not be considered as a limitation of the present invention. After reading the above content, it will be apparent to those skilled in the art that various modifications and substitutions of the present invention will occur. Therefore, the protection scope of the present invention should be limited by the appended claims.

[0060] The contents not described in detail in the specification of the present invention belong to the common knowledge of the professionals in this field.

Claims

1. A jitter aging device for a laser gyro optical resonator, characterized in that: include: An external shaking wheel (3), piezoelectric ceramics (2), a fixing tool (5), a shaking base plate (1) and a control system; wherein the external shaking wheel (3) is fixed on the shaking base plate (1); the piezoelectric ceramics (2) are bonded to the external shaking wheel (3); the resonant cavity (4) is placed on the external shaking wheel (3); the fixing tool (5) is placed on the resonant cavity (4) to fix the resonant cavity (4) on the external shaking wheel (3); the control system is connected to the piezoelectric ceramics (2) and the resonant cavity (4) electrodes through wires, and is used to control the operation of the external shaking wheel (3) and the lighting of the resonant cavity (4).

2. The jitter aging device for the laser gyro optical resonant cavity according to claim 1, characterized in that: The piezoelectric ceramic (2) comprises: a plurality of drive plates and feedback plates; wherein the drive plates are used to drive the external shaking wheel (3) and the resonant cavity (4) to shake; and the feedback plates are used to feedback the shaking state of the external shaking wheel (3).

3. The jitter aging device for the laser gyro optical resonator according to claim 2, characterized in that: The control system comprises: a signal output module, a real-time monitoring module and a high-voltage power supply module; wherein the signal output module is connected to the driving plate via a wire, outputs a sine wave or square wave signal, and causes the driving plate to vibrate according to the frequency of the output signal; the real-time detection module is connected to the feedback plate via a wire, and detects the amplitude of the feedback signal generated by the forced vibration of the feedback plate; the high-voltage power supply module is connected to the electrode of the excited resonance cavity (4) via a high-voltage wire, and outputs a direct current high voltage to the electrode to ionize and break down the working gas in the resonance cavity (4) and maintain it in a glow discharge state.

4. The jitter aging device for a laser gyro optical resonant cavity according to claim 3, characterized in that: The resonant cavity (4) coincides with the central axis of the external shaking wheel (3).

5. The jitter aging device for the laser gyro optical resonator according to claim 4, characterized in that: The three electrodes of the resonant cavity (4) are connected to a high-voltage power supply module via wires.

6. The jitter aging device for the laser gyro optical resonant cavity according to claim 5, characterized in that: The external shaking wheel (3) comprises an inner ring, an outer ring and a plurality of spokes; wherein the outer ring and the inner ring are connected by a plurality of evenly distributed spokes; the resonant cavity (4) is fixed on the inner ring; the piezoelectric ceramic (2) is bonded to both sides of each spoke by epoxy resin; and the outer ring is fixed on the shaking base plate (1).

7. The jitter aging device for the laser gyro optical resonator according to claim 6, characterized in that: The shaking base plate (1) meets the specified rigidity, ensuring that the outer ring of the external shaking wheel (3) does not move, so that the vibration of the spokes of the external shaking wheel (3) is completely transmitted to the inner ring, driving the resonance cavity (4) fixed on the inner ring to generate a small amplitude reciprocating rotation with the same frequency as the signal.

8. The jitter aging device for the laser gyro optical resonant cavity according to claim 7, characterized in that: The signal output module outputs a variable frequency signal with a frequency of 200 to 1000 Hz, driving the spokes of the external shaking wheel (3) to vibrate; the feedback sheet of the piezoelectric ceramic (2) undergoes forced vibration.

9. The jitter aging device for the laser gyro optical resonator according to claim 8, characterized in that: The real-time monitoring module adjusts the output signal frequency of the signal output module according to the amplitude of the received feedback signal, so that the output signal frequency is fixed at the resonant frequency when the feedback signal amplitude is maximum; if the feedback signal amplitude drops by more than 30%, the real-time monitoring module controls the signal output module and the high-voltage power supply module to stop working, and starts the sound and light alarm at the same time.

10. A jitter aging method for a laser gyro optical resonator cavity using the jitter aging device for a laser gyro optical resonator cavity as claimed in claim 9, characterized in that: include: The resonant cavity (4) is fixed to the external shaking wheel (3) through a fixing device (5), and connected to the line between the shaking control system; The signal output module applies a variable frequency sine wave or square wave voltage to the piezoelectric ceramic drive sheet, so that the external shaking wheel (3) drives the resonant cavity (4) to shake, and the real-time monitoring module adjusts the signal frequency parameters of the signal output module according to the amplitude of the signal received from the piezoelectric ceramic feedback sheet, so that the external shaking wheel (3) works at the resonant frequency; After the external shaking wheel (3) operates at the resonance frequency, the high-voltage power supply module is turned on and the gyroscope is lit, and the working current of the gyroscope is adjusted according to the process, and the shaking aging begins; The real-time monitoring module receives the signal from the piezoelectric ceramic feedback piece and monitors the jitter state of the laser gyro resonant cavity. When the jitter state is abnormal, the real-time monitoring module will control the high-voltage power supply module to cut off the power supply and start the sound and light alarm to prevent the gyro from emitting light in the static state.

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