CN-121977684-A - Doppler vibration meter remote optical path simulation calibration system and method

CN121977684ACN 121977684 ACN121977684 ACN 121977684ACN-121977684-A

Abstract

The application relates to a Doppler vibration meter remote light path simulation calibration system and method, wherein the system comprises a calibration station module, a double-laser emission module, a simulation remote target module, a detection and processing module, a control and adjustment module and a control and adjustment module, wherein the calibration station module is used for fixing the Doppler vibration meter and installing the simulation remote target module, the double-laser emission module is installed on the Doppler vibration meter and used for emitting infrared laser and detecting laser, the simulation remote target module is used for enabling an optical axis of the simulation remote target module to coincide with an optical axis of a simulation system and converting laser beams emitted by the double-laser emission module into parallel light and dynamically zooming the parallel light to form clear double light spots on a standard reflection target surface, the detection and processing module is used for shooting the double light spots formed on the standard reflection target surface, calculating the light spot offset based on shot images of the double light spots and transmitting the light spot offset to the control and adjustment module, and the control and adjustment module is used for adjusting the position and the gesture of the simulation remote target module according to the light spot offset so as to realize coaxial alignment of the light paths.

Inventors

TAN MIN
YUAN FENFANG
JIA HUI
ZHOU XIANG
DING XIAOHUA

Assignees

深圳市鹰眼视觉科技股份有限公司

Dates

Publication Date: 20260505
Application Date: 20260409

Claims (10)

1. A doppler vibrometer remote optical path analog calibration system, comprising: The calibration station module is used for fixing the Doppler vibration meter and installing the simulation remote target module; the double-laser emission module is arranged on the Doppler vibration meter and is used for emitting infrared laser and detecting laser; The simulation remote target module is used for converting the laser beam emitted by the double laser emission module into parallel light, and forming clear double light spots on the standard reflection target surface after dynamically zooming the parallel light; the detection and processing module is used for shooting double light spots formed on the standard reflection target surface, calculating the light spot offset based on the shot images of the double light spots, and transmitting the light spot offset to the control and regulation module; And the control and adjustment module is used for adjusting the position and the gesture of the simulated remote target module according to the light spot offset to realize the coaxial alignment of the light path.
2. The Doppler vibration meter remote optical path simulation calibration system according to claim 1, wherein the simulation remote target module comprises a front collimation group, an intermediate zoom group, a rear focusing group, a standard reflecting target surface and a linear driving mechanism which are sequentially arranged along an optical axis of the simulation system, wherein the intermediate zoom group is arranged at a moving end of the linear driving mechanism, a fixed end of the linear driving mechanism is arranged on a mounting platform of the calibration station module, and the linear driving mechanism is electrically connected with the control and regulation module; the front collimation group consists of convex lenses, and the optical axis of the front collimation group coincides with the optical axis of the simulation system and is used for converting laser beams emitted by the double-laser emission module into parallel light; The intermediate zoom group is composed of converging optical lenses, and the optical axis of the intermediate zoom group coincides with the optical axis of the analog system and is used for changing the converging angle of parallel light to form a theoretical focus; The rear focusing group consists of a focusing lens, and the optical axis of the rear focusing group coincides with the optical axis of the simulation system and is used for converging all theoretical focuses into clear double light spots on a standard reflection target surface; the linear driving mechanism is used for driving the middle zoom group to linearly move along the optical axis of the analog system according to the control signal of the control and adjustment module so as to realize adjustment of the equivalent focal length.
3. The doppler vibrometer remote optical path simulation calibration system of claim 1, wherein the detection and processing module comprises an infrared camera, an FPGA processing unit; The infrared camera is arranged on one side of the standard reflecting target surface, the lens faces the standard reflecting target surface and is parallel to the standard reflecting target surface, the infrared camera is electrically connected with the FPGA processing unit, and the infrared camera is used for shooting double light spots formed on the standard reflecting target surface and transmitting shot images of the double light spots to the FPGA processing unit; The FPGA processing unit is electrically connected with the control and adjustment module and is used for calculating the light spot offset based on the photographed images of the double light spots and transmitting the light spot offset to the control and adjustment module.
4. The Doppler vibration meter remote optical path simulation calibration system according to claim 3, wherein the light spot offset comprises an offset in a horizontal direction and an offset in a vertical direction, and the offset calculation comprises: Extracting the center coordinates of the two light spots; Respectively calculating the offset in the horizontal direction between the central coordinates of the two light spots and the optical axis of the simulation system; and respectively calculating the offset in the vertical direction between the central coordinates of the two light spots and the optical axis of the simulation system.
5. The doppler vibrometer remote optical path simulation calibration system of claim 2, wherein the detection and processing module further comprises a doppler vibrometer receive optical path, a vibrometer signal detection unit; the Doppler vibration meter receiving optical path is integrated in the Doppler vibration meter, the optical axis of the Doppler vibration meter receiving optical path coincides with the reference optical axis of the Doppler vibration meter, the Doppler vibration meter receiving optical path is electrically connected with the vibration meter signal detection unit, and the Doppler vibration meter receiving optical path is used for collecting laser reflected by the standard reflection target surface and transmitting laser signals to the vibration meter signal detection unit; the vibration meter signal detection unit is electrically connected with the control and adjustment module and is used for carrying out signal-to-noise ratio detection based on laser signals and transmitting signal-to-noise ratio data to the control and adjustment module.
6. The system of claim 5, wherein the control and adjustment module comprises a main control module and a fine adjustment module; The main control module is respectively and electrically connected with each component in the double-laser emission module, the simulated remote target module and the detection and processing module and is used for receiving each feedback and sending corresponding control signals according to a corresponding built-in algorithm; The precise adjusting module is fixed on the mounting platform of the calibration station module and is electrically connected with the main control module, and is used for adjusting the position and the gesture of the simulated remote target module according to the control signal of the simulated remote target module and adjusting the position of the self-focusing lens according to the control signal of the self-focusing lens of the Doppler vibration meter.
7. The doppler vibrometer remote optical path simulation calibration system of claim 6, wherein the built-in algorithm comprises: Initializing a control algorithm, namely setting an equivalent distance of a simulated lens according to a calibration requirement, controlling a linear driving mechanism to drive the middle zoom group to translate to a corresponding position, and controlling the dual-laser emitting module to start synchronously; the spot offset adjustment algorithm is used for judging whether the spot offset exceeds an offset threshold value, if so, generating a control signal aiming at the simulation remote target module and driving the precise adjustment module to adjust the position and the posture of the simulation remote target module, otherwise, performing no processing; judging whether the signal-to-noise ratio data reach a signal-to-noise ratio threshold value or not, if so, generating a control signal aiming at a self-focusing lens of the Doppler vibration meter, and driving the precise adjustment module to adjust the position of the self-focusing lens; And (3) circularly executing a spot offset adjustment algorithm and a self-focusing adjustment algorithm until the calibration qualified standard is met.
8. The doppler vibrometer remote optical path simulation calibration system of claim 7, further comprising an environmental control module comprising a temperature controller, a humidity controller, a vibration isolation platform, an electromagnetic screen, the environmental control module configured to reduce the effects of temperature, humidity, external vibrations, external electromagnetic waves in the environment on the calibration system.
9. A method for applying to the doppler vibrometer remote optical path simulation calibration system of claim 8, comprising: The method comprises the steps of 1, fixing a Doppler vibration meter on a fixed clamp of a calibration station module, and installing a simulated remote target module on an installation platform, manually adjusting the installation platform to enable an optical lens axis of the simulated remote target module to be parallel to a reference optical axis of the Doppler vibration meter, and controlling the distance between the optical lens axis and the reference optical axis within a range of 0.5-1 m; step 2, the control and regulation module operates an initialization control algorithm, and the double-laser emission module emits laser beams; Step 3, converting the laser beam emitted by the double laser emission module into parallel light through the simulation remote target module, and forming clear double light spots on the standard reflecting target surface after dynamically zooming the parallel light; Shooting double light spots formed on a standard reflecting target surface through a detection and processing module, calculating a light spot offset based on a shot image of the double light spots, collecting laser reflected by the standard reflecting target surface, transmitting the light spot offset to a control and regulation module, detecting signal-to-noise ratio based on the collected laser reflected by the standard reflecting target surface, and transmitting signal-to-noise ratio data to the control and regulation module; And 5, the control and adjustment module circularly operates a light spot offset adjustment algorithm and a self-focusing adjustment algorithm based on the light spot offset and the signal-to-noise ratio data until the light spot offset adjustment algorithm and the self-focusing adjustment algorithm meet the calibration standard, and the Doppler vibration meter remote light path simulation calibration is completed.
10. The method of claim 9, further comprising pre-activating the environmental control module to reduce the effects of ambient temperature, humidity, external vibrations, external electromagnetic waves on the calibration system before the control and regulation module runs the initialization control algorithm.

Description

Doppler vibration meter remote optical path simulation calibration system and method Technical Field The application relates to the technical field of Doppler vibration meter optical path calibration, in particular to a Doppler vibration meter remote optical path simulation calibration system and method. Background At present, the calibration link of the Doppler vibration meter after production and manufacture mainly needs to complete two core tasks, namely optical path coaxial alignment and remote detection performance simulation verification, and the industry is generally divided into two independent systems for optical path coaxial alignment and remote optical path simulation respectively. The existing independent scheme has the following remarkable defects, and the calibration efficiency, the calibration precision and the product delivery quality are seriously restricted: (1) The calibration flow is separated, the efficiency is extremely low, the light path alignment and the remote simulation are two independent operation flows, a remote simulation system (or a lens group is replaced) is required to be built, then the light path alignment is carried out, and the calibration period is long. If the simulation distance needs to be replaced, the whole process of disassembly-replacement-alignment needs to be repeated, and the requirement of mass production cannot be met. (2) The alignment precision is low, the uniformity is poor, the manual adjustment is influenced by the experience of operators, the ambient light, the visual fatigue and other factors, the alignment precision cannot be ensured, the single light spot feedback adjustment has no reference, only the position of the light spot on the target surface can be ensured, the coaxial alignment of the transmitting light path and the receiving light path of the vibration meter and the optical axis of the simulation system cannot be truly realized, and the alignment uniformity of different batches of products is poor. (3) The remote simulation has poor flexibility and high cost, the real remote calibration is limited by sites and cannot be realized in a production workshop, the fixed focal length lens group simulation needs to be provided with a plurality of groups of lenses, the equipment purchase and storage cost is increased, and mechanical errors are easily introduced in the lens replacement process, so that the optical path is deviated, and the calibration precision is further reduced. (4) The calibration judgment standard is single, and the reliability is insufficient, in the prior art, only 'whether the spot position is qualified' is used as a unique judgment standard for the qualification of the calibration, and the comprehensive judgment is carried out by not combining the core performance index of the Doppler vibration meter, namely the reflected light signal-to-noise ratio (SNR). Although part of the system can detect the signal-to-noise ratio, when the signal-to-noise ratio does not reach the standard, an effective linkage adjustment mechanism is lacked, and the system can only rely on manual repeated error test, so that the reliability of a calibration result is extremely low. (5) The environment adaptability is poor, the calibration result is unstable, the influence of environmental factors is not considered in the existing calibration system, the optical element thermal deformation caused by temperature change, the thermal expansion and contraction of a mechanical structure, the external vibration, the electromagnetic interference and the like can cause the light path deviation, and the deviation of the calibration result is caused. Disclosure of Invention In one aspect, a system for performing analog calibration on a remote optical path of a doppler vibrometer is provided, including: the calibration station module is used for fixing the Doppler vibration meter and installing the simulation remote target module; the double-laser emission module is arranged on the Doppler vibration meter and is used for emitting infrared laser and detecting laser; The simulation remote target module is used for converting the laser beam emitted by the double laser emission module into parallel light, and forming clear double light spots on the standard reflection target surface after dynamically zooming the parallel light; the detection and processing module is used for shooting double light spots formed on the standard reflection target surface, calculating the light spot offset based on the shot images of the double light spots, and transmitting the light spot offset to the control and regulation module; And the control and adjustment module is used for adjusting the position and the gesture of the simulated remote target module according to the light spot offset to realize the coaxial alignment of the light path. Preferably, the simulation remote target module comprises a front collimation group, a middle zoom group, a rear focusing group, a standard reflec