CN210400408U - Laser gyro pre-amplification circuit - Google Patents
Laser gyro pre-amplification circuit Download PDFInfo
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- CN210400408U CN210400408U CN201920943208.5U CN201920943208U CN210400408U CN 210400408 U CN210400408 U CN 210400408U CN 201920943208 U CN201920943208 U CN 201920943208U CN 210400408 U CN210400408 U CN 210400408U
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Abstract
The utility model discloses a laser gyro pre-amplification circuit, which comprises a photoelectric detector, wherein the photoelectric detector is electrically connected with an I-V conversion circuit, the I-V conversion circuit is electrically connected with an amplification circuit, the amplification circuit is electrically connected with a comparator circuit, and the laser gyro pre-amplification circuit also comprises a power module; the power module is a +/-5V power supply. The bandwidth of the circuit is increased by controlling the frequency band, increasing the feedback resistance and selecting a proper operational amplifier; the circuit noise is reduced, and the signal-to-noise ratio is favorably improved and the conversion coefficient of current-voltage conversion is favorably improved by increasing the feedback resistance Rf. The whole preamplifier circuit system adopts a shielding design, so that the anti-interference capability of the system is improved.
Description
Technical Field
The utility model belongs to the technical field of laser gyro amplification equipment, concretely relates to laser gyro preamplifier circuit.
Background
The laser gyro is an optical gyro based on the Sagnac effect, and the angular velocity of a carrier is measured by means of the resonance frequency difference between two-way traveling waves in a ring-shaped laser cavity. The detection circuit is used as a component of the laser gyro and mainly has the task of performing photoelectric conversion, amplification, shaping, counting and the like on a weak light intensity signal output from the resonant cavity and outputting a pulse signal which is in direct proportion to the rotating speed of the gyro. Laser gyroscopes generally utilize photodiodes as laser detection devices to photoelectrically convert gyroscope signals. Because the gyro signal is very weak, the signal must be amplified by an amplifier first to carry out shaping, phase discrimination and counting. Therefore, the preamplifier is the most important component of the whole laser gyro detection circuit.
From the development trend of the laser gyroscope at present, the laser gyroscope is mainly developed towards the high-requirement direction of higher precision and higher reliability and the subminiature tactics application direction of smaller volume, cheaper price and firmer structure. Correspondingly, on one hand, the laser gyro circuit is developed towards high performance, high precision and high reliability, and further the precision and the reliability of the laser gyro are improved; on the other hand, as the development of application specific integrated circuits in the electronic product industry becomes a basic means for developing electronic products, the laser gyro preamplifier circuit will be developed towards high integration level by using a dedicated chip. However, the existing laser gyro preamplifier circuit has the following disadvantages, firstly, the bandwidth is insufficient: the laser gyro has a high theoretical bandwidth, but in practical application, the output signal of the laser gyro needs to be subjected to photoelectric conversion, pre-amplification, shaping, phase discrimination, digital filtering and the like, and the factors limit the bandwidth of the laser gyro to a certain extent; secondly, the noise is big: the noise mainly includes photodetector noise, resistance thermal noise, and operational amplifier noise. And no noise processing circuit part exists in the current circuit design; thirdly, the volume is large: at present, an older integrated circuit chip is generally selected, the size is large, and the layout of a circuit board is not regular, so that the size of a system is overlarge; fourth, signal-to-noise ratio difference: the poor signal-to-noise ratio of the output signal can cause the conditions of the hop count of the output signal and the like; fifth, dark current is large: dark current exists in the photoelectric detector, and the dark current of the photoelectric tube can be effectively reduced by using the non-bias circuit; sixthly, the interference resistance is poor: the noise of the circuit is large, and the signal-to-noise ratio is poor, so the anti-interference capability of the system is relatively poor.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a laser gyro preamplification circuit has reduced the circuit noise, has improved the conversion coefficient of current-voltage conversion.
The utility model adopts the technical scheme that the laser gyro pre-amplification circuit comprises a photoelectric detector, wherein the photoelectric detector is electrically connected with an I-V conversion circuit, the I-V conversion circuit is electrically connected with an amplification circuit, and the amplification circuit is electrically connected with a comparator circuit, and also comprises a power module; the power supply module is a +/-5V power supply;
an I-V conversion circuit comprises a resistor R5, one end of a resistor R5 is respectively connected with a port of a photoelectric detector and a +5V power supply, the other end of a resistor R5 is respectively connected with one end of a capacitor C4 and one end of a resistor R7, the other end of a capacitor C4 is respectively connected with one end of a resistor R1, one end of a resistor R3, one end of a capacitor C3 and a4 pin of an operational amplifier U1, one end of a resistor R1, one end of a resistor R3 and one end of a capacitor C3 are respectively connected with a 5 pin of an operational amplifier U1, the other end of a resistor R1 is respectively connected with a +5V power supply and one end of a capacitor C1, the other ends of the resistor R1 and the capacitor C1 are respectively connected with a 1 pin of the operational amplifier U1, a 3 pin of the operational amplifier U1 is respectively connected with one end of the resistor R1 and one end of the capacitor C1, a 2 pin of the operational amplifier U1 is respectively connected with one end of the resistor R, the other end of the resistor R6 is respectively connected with one end of a capacitor C2, one end of a resistor R2, one end of a resistor R4 and a pin 2 of an operational amplifier U4, one end of a capacitor C2, one end of a resistor R2 and one end of a resistor R4 are also connected with a pin 8 of an operational amplifier U4, the other end of the resistor R2 is connected with a +5V power supply, the other end of the resistor R4 is connected with a pin 1 of an operational amplifier U4, a pin 3 of the operational amplifier U4 is connected with one end of a resistor R10, a pin 4 of the operational amplifier U4 is respectively connected with one end of a resistor R12 and one end of a capacitor C8, the other end of the resistor R12 is connected with a-5V; the other ends of the resistor R7, the capacitor C1, the resistor R8, the capacitor C6, the capacitor C7, the capacitor C2, the resistor R10, the capacitor C8 and the capacitor C5 are all grounded;
the amplifying circuit comprises a resistor R26, the port of the photodetector is further connected with one end of a resistor R26, one end of a resistor R26 is further connected with a +5V power supply, the other end of a resistor R26 is respectively connected with one end of a capacitor C16 and one end of a resistor R28, the other end of a capacitor C16 is respectively connected with one end of a capacitor C11, one end of a resistor R19, one end of a resistor R21, one end of a capacitor C21 and 4 feet of an operational amplifier U21, one end of a capacitor C21, one end of a resistor R21 and one end of the capacitor C21 are also connected with a 5 foot of the operational amplifier U21, the other end of the resistor R21 is connected with a +5V power supply, the other ends of the resistor R21 and the capacitor C21 are respectively connected with a 1 foot of the operational amplifier U21, a 3 foot of the operational amplifier U21 is respectively connected with one end of the resistor R21 and one end of the capacitor C21, a 2 foot of the operational amplifier U21 is connected with one end, the other end of the resistor R27 is respectively connected with one end of a resistor R24 and a pin 6 of an operational amplifier U4, a pin 5 of the operational amplifier U4 is connected with one end of a resistor R31, and a pin 7 of the operational amplifier U4 is connected with the other end of a resistor R24; the other ends of the resistor R28, the capacitor C11, the resistor R29, the capacitor C18, the capacitor C19 and the resistor R31 are all grounded.
The utility model is also characterized in that,
the comparator circuit comprises a comparator U3, wherein pins 2 and 3 of the comparator U3 are respectively connected with pins 1 and 7 of an operational amplifier U4, pin 1 of the comparator U3 is respectively connected with one end of a resistor R13, one end of a resistor R14 and one end of a resistor R11, the other end of the resistor R14 is connected with VREF, the other end of the resistor R11 is respectively connected with pin 8 of the comparator U3 and one end of a resistor R3, the other end of the resistor R3 is connected with pin 2 of an output terminal P3 through a port SIN, pin 4 of the comparator U3 is respectively connected with one end of a resistor R3, one end of a resistor R3 and one end of a resistor R3, the other end of the resistor R3 is connected with VREF, the other end of the resistor R3 is respectively connected with pin 7 of the U3 and one end of the resistor R3, the other end of the resistor R3 is connected with pin 1 of the output terminal P3 through a port COS, pin 5 of the comparator U3 is respectively connected with one end of a capacitor C3, the other end of the power supply and one, One end of the capacitor C9 and one end of the resistor R15, and the other end of the resistor R15 is connected with a +5V power supply; the other end of the resistor R13, the other end of the resistor R22, the other end of the capacitor C9, the other end of the capacitor C10, the other end of the capacitor C13, the other end of the capacitor C14 and a pin 6 of the comparator U3 are all grounded.
Comparator U3 is model LT1715 IMS.
The operational amplifier U4 is model ADA4077-2 ARMZ.
The operational amplifier U1 and operational amplifier U2 are model OPA 656N.
The utility model has the advantages that,
the bandwidth of the circuit is increased by controlling the frequency band, increasing the feedback resistance and selecting a proper operational amplifier; the circuit noise is reduced, and the signal-to-noise ratio is favorably improved and the conversion coefficient of current-voltage conversion is favorably improved by increasing the feedback resistance Rf. The whole preamplifier circuit system adopts a shielding design, so that the anti-interference capability of the system is improved.
Drawings
Fig. 1 is a schematic structural diagram of a laser gyro preamplifier circuit according to the present invention;
FIG. 2 is a circuit diagram of an I-V conversion circuit in a pre-amplification circuit of a laser gyro according to the present invention;
fig. 3 is a circuit diagram of an amplifying circuit in a pre-amplifying circuit of a laser gyro according to the present invention;
fig. 4 is a circuit diagram of a comparator circuit in a preamplifier circuit of a laser gyro of the present invention.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings and specific embodiments.
The utility model relates to a laser gyro pre-amplification circuit, as shown in figure 1, which comprises a photoelectric detector, wherein the photoelectric detector is electrically connected with an I-V conversion circuit, the I-V conversion circuit is electrically connected with an amplification circuit, and the amplification circuit is electrically connected with a comparator circuit, and also comprises a power module, the photoelectric detector, the I-V conversion circuit and the amplification circuit, and the amplification circuit and the comparator circuit are respectively and electrically connected with the power module;
the power supply module is a +/-5V power supply;
an I-V conversion circuit, as shown in fig. 2, includes a resistor R5, one end of the resistor R5 is connected to a port of the photodetector and a +5V power supply, the other end of the resistor R5 is connected to one end of a capacitor C4 and one end of a resistor R7, the other end of the capacitor C4 is connected to one end of a resistor R1, one end of a resistor R3, one end of a capacitor C3 and 4 pins of an operational amplifier U1, one end of a resistor R1, one end of a resistor R3 and one end of a capacitor C3 are also connected to 5 pins of an operational amplifier U1, the other end of a resistor R1 is connected to one end of a +5V power supply and one end of a capacitor C1, the other ends of the resistor R1 and the capacitor C1 are both connected to 1 pin of the operational amplifier U1, 3 pins of the operational amplifier U1 are connected to one end of a resistor R1 and one end of a capacitor C1, 2 pins of the operational amplifier U1 are connected to one end of a resistor R1, the other end of the resistor R6 is respectively connected with one end of a capacitor C2, one end of a resistor R2, one end of a resistor R4 and a pin 2 of an operational amplifier U4, one end of a capacitor C2, one end of a resistor R2 and one end of a resistor R4 are also connected with a pin 8 of an operational amplifier U4, the other end of the resistor R2 is connected with a +5V power supply, the other end of the resistor R4 is connected with a pin 1 of an operational amplifier U4, a pin 3 of the operational amplifier U4 is connected with one end of a resistor R10, a pin 4 of the operational amplifier U4 is respectively connected with one end of a resistor R12 and one end of a capacitor C8, the other end of the resistor R12 is connected with a-5V;
the other ends of the resistor R7, the capacitor C1, the resistor R8, the capacitor C6, the capacitor C7, the capacitor C2, the resistor R10, the capacitor C8 and the capacitor C5 are all grounded;
as shown in fig. 3, the port of the photodetector is further connected to one end of a resistor R26, one end of the resistor R26 is further connected to a +5V power supply, the other end of the resistor R26 is connected to one end of a capacitor C16 and one end of a resistor R28, the other end of a capacitor C16 is connected to one end of a capacitor C11, one end of a resistor R19, one end of a resistor R21, one end of a capacitor C15 and 4 pins of an operational amplifier U2, one end of a capacitor C11, one end of a resistor R19 and one end of a capacitor C19 are further connected to 5 pins of the operational amplifier U19, the other end of the resistor R19 is connected to a +5V power supply, the other ends of the resistor R19 and the capacitor C19 are respectively connected to 1 pin of the operational amplifier U19, the 3 pin of the operational amplifier U19 is connected to one end of a resistor R19 and one end of a capacitor C19, the operational amplifier U19 is connected to one end of the resistor R19, the other end of the resistor R27 is respectively connected with one end of a resistor R24 and a pin 6 of an operational amplifier U4, a pin 5 of the operational amplifier U4 is connected with one end of a resistor R31, and a pin 7 of the operational amplifier U4 is connected with the other end of a resistor R24;
the other ends of the resistor R28, the capacitor C11, the resistor R29, the capacitor C18, the capacitor C19 and the resistor R31 are all grounded;
the models of the operational amplifier U1 and the operational amplifier U2 are both OPA656N, and the model of the operational amplifier U4 is ADA4077-2 ARMZ;
as shown in fig. 4, in the comparator circuit, pins 2 and 3 of a comparator U3 are connected to pins 1 and 7 of an operational amplifier U4, pin 1 of a comparator U3 is connected to one end of a resistor R13, one end of a resistor R14, and one end of a resistor R11, the other end of a resistor R14 is connected to VREF (+2.5V power), the other end of a resistor R11 is connected to pin 8 of a comparator U3, and one end of a resistor R16, the other end of a resistor R16 is connected to pin 2 of an output terminal P2 through a port SIN, pin 4 of a comparator U3 is connected to one end of a resistor R22, one end of a resistor R23, and one end of a resistor R25, the other end of a resistor R23 is connected to VREF (+2.5V power), the other end of a resistor R25 is connected to pin 7 of a resistor U3, one end of a resistor R3, the other end of a resistor R3 is connected to pin 1 of an output terminal P3 through a port, the pin 5 of a capacitor C3, the other end of a resistor R3 is connected, the pin 9 and the pin 10 of the comparator U3 are respectively connected with one end of a capacitor C10, one end of a capacitor C9 and one end of a resistor R15, and the other end of the resistor R15 is connected with a +5V power supply;
the other end of the resistor R13, the other end of the resistor R22, the other end of the capacitor C9, the other end of the capacitor C10, the other end of the capacitor C13, the other end of the capacitor C14 and a pin 6 of the comparator U3 are all grounded;
the model of the comparator U3 is LT1715 IMS;
the utility model relates to a leading amplifier circuit of laser top, its concrete theory of operation is:
the amplifying system comprises a photoelectric detector module, a power module circuit, an I-V conversion circuit, an amplifying circuit, a comparator circuit, a square wave output circuit and the like. Two opposite traveling waves in the laser cavity form light and dark interference fringes through a light-combining prism and the like, an optical signal is converted into an electric signal by using a photoelectric detector, and then a weak current signal is converted into a voltage signal by using an I/V conversion circuit and amplified. Then, the square wave is amplified for the first stage through the amplifying circuit and then converted into square waves through the comparator circuit to be output to the control system;
as shown in fig. 2 and 3, resistor R5 is used to eliminate glitches in the detector output current; resistor R7 prevents the circuit from self-exciting while providing a dc path; the capacitor C4 is a DC blocking capacitor; the resistor R8 is used to compensate the dc error caused by the resistor R3 being too large, and the capacitor C6 is connected in parallel to the resistor R8 to remove the stray noise; the capacitor C3 connected in parallel with the resistor R3 is a vibration-eliminating capacitor, so that the noise bandwidth is reduced;
the signal shaped and amplified by the circuit is realized by a two-way comparator LT1715IMS, the cathode of the comparator is SIN/COS signal conditioned by the conditioning circuit, and the anode of the comparator is comparison voltage divided by resistors R13 and R14, and the comparison voltage is VREF x (R13/R13+ R14), which is about 25 mv.
The utility model relates to a leading amplifier circuit of laser top, its concrete advantage is:
(1) large bandwidth: the laser gyro has higher theoretical bandwidth, but in practical application, the output signal of the laser gyro needs to be subjected to photoelectric conversion, pre-amplification, shaping, phase discrimination, digital filtering and other processing, the factors limit the bandwidth of the laser gyro to a certain extent, and the bandwidth of a circuit is increased by controlling a frequency band, increasing a feedback resistor and selecting a proper operational amplifier;
(2) and (3) miniaturization: according to the miniaturization of the laser gyroscope, a miniaturized preamplification system is established, and the size of the system is reduced by mainly selecting a miniaturized integrated circuit and adopting 4-layer plate arrangement during plate arrangement;
(3) the signal-to-noise ratio is high: the distance from the output end of the photoelectric tube to the lead wire of the first-stage amplifier is as short as possible, and the lead wires are symmetrical as possible, so that impedance is basically matched; the two amplifiers are in consistent wiring layout, so that the impedance characteristics of the lines are ensured to be consistent; the input and the output of the amplifier avoid cross wiring, so that mutual coupling is prevented, and the signal-to-noise ratio of the system is increased;
(4) the anti-interference capability is strong: the operational amplifier has distributed capacitance between poles, and C6 should be selected appropriately so that RiC3 is R3C6 in order to cancel noise interference due to the distributed capacitance between poles. The output signal of the photoelectric detector is transmitted by adopting a shielding wire, and the preposed amplifying circuit is close to the laser gyro to the maximum extent. The whole preamplifier circuit system adopts a shielding design, so that the anti-interference capability of the system is improved.
Claims (5)
1. The laser gyro pre-amplification circuit is characterized by comprising a photoelectric detector, a power module and a control module, wherein the photoelectric detector is electrically connected with an I-V conversion circuit, the I-V conversion circuit is electrically connected with an amplification circuit, the amplification circuit is electrically connected with a comparator circuit, and the photoelectric detector, the I-V conversion circuit, the amplification circuit and the comparator circuit are respectively and electrically connected with the power module; the power supply module is a +/-5V power supply;
the I-V conversion circuit comprises a resistor R5, one end of a resistor R5 is respectively connected with a port of a photoelectric detector and a +5V power supply, the other end of a resistor R5 is respectively connected with one end of a capacitor C4 and one end of a resistor R7, the other end of a capacitor C4 is respectively connected with one end of a resistor R1, one end of a resistor R3, one end of a capacitor C3 and 4 pins of an operational amplifier U1, one end of a resistor R1, one end of a resistor R3 and one end of a capacitor C3 are respectively connected with 5 pins of an operational amplifier U1, the other end of a resistor R1 is respectively connected with a +5V power supply and one end of a capacitor C1, the other ends of the resistor R1 and the capacitor C1 are respectively connected with 1 pin of the operational amplifier U1, a 3 pin of the operational amplifier U1 is respectively connected with one end of the resistor R1 and one end of the capacitor C1, a 2 pin of the operational amplifier U1 is respectively connected with one end of the resistor R1 and one, the other end of the resistor R6 is respectively connected with one end of a capacitor C2, one end of a resistor R2, one end of a resistor R4 and a pin 2 of an operational amplifier U4, one end of a capacitor C2, one end of a resistor R2 and one end of a resistor R4 are also connected with a pin 8 of an operational amplifier U4, the other end of the resistor R2 is connected with a +5V power supply, the other end of the resistor R4 is connected with a pin 1 of an operational amplifier U4, a pin 3 of the operational amplifier U4 is connected with one end of a resistor R10, a pin 4 of the operational amplifier U4 is respectively connected with one end of a resistor R12 and one end of a capacitor C8, the other end of the resistor R12 is connected with a-5V; the other ends of the resistor R7, the capacitor C1, the resistor R8, the capacitor C6, the capacitor C7, the capacitor C2, the resistor R10, the capacitor C8 and the capacitor C5 are all grounded,
the amplifying circuit comprises a resistor R26, a port of the photodetector is further connected with one end of a resistor R26, one end of a resistor R26 is further connected with a +5V power supply, the other end of a resistor R26 is respectively connected with one end of a capacitor C16 and one end of a resistor R28, the other end of a capacitor C16 is respectively connected with one end of a capacitor C11, one end of a resistor R19, one end of a resistor R21, one end of a capacitor C21 and 4 feet of an operational amplifier U21, one end of a capacitor C21, one end of a resistor R21 and one end of the capacitor C21 are further connected with a 5 foot of the operational amplifier U21, the other end of the resistor R21 is connected with a +5V power supply, the other ends of the resistor R21 and the capacitor C21 are respectively connected with a 1 foot of the operational amplifier U21, a 3 foot of the operational amplifier U21 is respectively connected with one end of the resistor R21 and one end of the capacitor C21, a 2 foot of the operational amplifier U21 is connected with one end of, the other end of the resistor R27 is respectively connected with one end of a resistor R24 and a pin 6 of an operational amplifier U4, a pin 5 of the operational amplifier U4 is connected with one end of a resistor R31, and a pin 7 of the operational amplifier U4 is connected with the other end of a resistor R24; the other ends of the resistor R28, the capacitor C11, the resistor R29, the capacitor C18, the capacitor C19 and the resistor R31 are all grounded.
2. The preamplifier circuit of claim 1, wherein the comparator circuit comprises a comparator U3, the 2 and 3 pins of the comparator U3 are respectively connected with the 1 and 7 pins of the operational amplifier U4, the 1 pin of the comparator U3 is respectively connected with one end of a resistor R13, one end of a resistor R14 and one end of R11, the other end of a resistor R14 is connected with VREF, the other end of a resistor R11 is respectively connected with the 8 pin of a comparator U3 and one end of a resistor R16, the other end of a resistor R16 is connected with the 2 pin of an output terminal P2 through a port SIN, the 4 pins of the comparator U3 are respectively connected with one end of a resistor R22, one end of a resistor R23 and one end of a resistor R9, the other end of a resistor R23 is connected with VREF, the other end of a resistor R25 is respectively connected with the 7 pin of a U3 and one end of a resistor R17, the other end of a resistor R17 is connected with the 1 pin of a COS output terminal P2 through a port, and one end of a capacitor, One end of a capacitor C14 and one end of a resistor R18, the other end of the resistor R18 is connected with a-5V power supply, a pin 9 and a pin 10 of a comparator U3 are respectively connected with one end of a capacitor C10, one end of a capacitor C9 and one end of a resistor R15, and the other end of the resistor R15 is connected with a +5V power supply; the other end of the resistor R13, the other end of the resistor R22, the other end of the capacitor C9, the other end of the capacitor C10, the other end of the capacitor C13, the other end of the capacitor C14 and a pin 6 of the comparator U3 are all grounded.
3. The preamplifier circuit of claim 2, wherein the comparator U3 is LT1715 IMS.
4. The preamplifier circuit of any of claims 1-2, wherein the operational amplifier U4 is model ADA4077-2 ARMZ.
5. The preamplifier circuit of claim 1, wherein the operational amplifier U1 and the operational amplifier U2 are both OPA 656N.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920943208.5U CN210400408U (en) | 2019-06-21 | 2019-06-21 | Laser gyro pre-amplification circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920943208.5U CN210400408U (en) | 2019-06-21 | 2019-06-21 | Laser gyro pre-amplification circuit |
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| CN210400408U true CN210400408U (en) | 2020-04-24 |
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| CN201920943208.5U Active CN210400408U (en) | 2019-06-21 | 2019-06-21 | Laser gyro pre-amplification circuit |
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Effective date of registration: 20200812 Address after: Room 301, building 1, coffee Angel building, No.9, Gaoxin 2nd Road, hi tech Zone, Xi'an City, Shaanxi Province Patentee after: Huaxing Aerospace (Xi'an) measurement and Control Technology Co.,Ltd. Address before: 710077 G43F Xi'an Industrial Park, Xi'an, Shaanxi. Patentee before: XI'AN DEXUNWEI PHOTOELECTRIC MEASUREMENT AND CONTROL TECHNOLOGY Co.,Ltd. |
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Effective date of registration: 20210113 Address after: 442000 No. 127, Huichuan village committee, Yuanyang Township People's government, Maojian District, Shiyan City, Hubei Province Patentee after: Huaxing Aerospace (Hubei) measurement and Control Technology Co.,Ltd. Address before: Room 301, building 1, coffee Angel building, garage, No.9, Gaoxin 2nd Road, high tech Zone, Xi'an City, Shaanxi Province, 710077 Patentee before: Huaxing Aerospace (Xi'an) measurement and Control Technology Co.,Ltd. |
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Effective date of registration: 20220608 Address after: 442099 No. 102, unit 2, building 1, No. 2, dongfangli, Yichang Road, Maojian District, Shiyan City, Hubei Province Patentee after: Zhang Qi Address before: 442000 No. 127, Huichuan village committee, Yuanyang Township People's government, Maojian District, Shiyan City, Hubei Province Patentee before: Huaxing Aerospace (Hubei) measurement and Control Technology Co.,Ltd. |
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Effective date of registration: 20220922 Address after: 442012 No. 127, Huichuan village committee, Yuanyang Township People's government, Maojian District, Shiyan City, Hubei Province Patentee after: Huaxing Aerospace (Hubei) Aerospace Technology Co.,Ltd. Address before: 442099 No. 102, unit 2, building 1, No. 2, dongfangli, Yichang Road, Maojian District, Shiyan City, Hubei Province Patentee before: Zhang Qi |