Weak-rigidity two-axis four-frame photoelectric detection equipment

Abstract

The utility model discloses a weak rigidity two-shaft four-frame photoelectric detection device. Comprising a sensor group, an inner azimuth shaft system formed by connecting an inner azimuth shaft and an inner azimuth frame, an inner pitch shaft system formed by connecting an inner pitch shaft and an inner pitch frame, an outer pitch shaft system formed by connecting an outer pitch shaft and an outer pitch frame, and an outer orientation shaft system formed by connecting an outer orientation shaft and an outer orientation frame, the sensor group is mainly composed of an infrared sensor, a reference mirror, a television sensor and a laser distance measuring sensor and is connected with the inner pitching frame through a sensor support, and the left side and the right side of an inner pitching shaft system are connected with an angle measuring shaft end and a motor shaft end respectively. The angle measuring shaft end and the motor shaft end are fastened and connected through a height calibration tool to realize equal height of mounting surfaces; according to the utility model, the stability problem of a weak-rigidity structure is solved, the height difference between the mounting surfaces at the two ends is within 0.03 mm, and the optical axis parallelism is within 20 ''.

Description

TECHNICAL FIELD

[0001] The utility model belongs to photoelectric detection equipment, concretely relates to a weak rigidity two-axis four-frame photoelectric detection equipment. BACKGROUND

[0002] In recent years, helicopters tend to unmanned design, in order to provide powerful tracking, investigation ability of unmanned helicopter, unmanned helicopter will be equipped with photoelectric detection equipment, as the " eye " of unmanned driving.

[0003] Photoelectric detection equipment in order to have high-precision pointing accuracy and tracking accuracy, generally adopt two-axis two-frame structure. Figure 1 The current two-axis four-frame photoelectric detection equipment is mainly composed of outer azimuth axis system, outer pitch axis system, inner azimuth axis system, inner pitch axis system and optical sensor group.

[0004] Due to the vibration excitation of helicopter operating environment, temperature change is big, the structure stability and optical axis stability of photoelectric detection equipment are required severely. Meanwhile, the weight and space of airborne equipment are strictly limited, the frame structure form and weight of inner azimuth axis system and inner pitch axis system are constrained, the rigidity of itself is lower, and will produce deformation along with the installation of infrared, television and laser ranging sensor, thereby causing the change of sensor optical axis, affecting the pointing accuracy and tracking accuracy of product. UTILITY MODEL CONTENTS

[0005] In view of the above defects of prior art, the utility model aims at providing a weak rigidity two-axis four-frame photoelectric detection equipment.

[0006] The utility model discloses a weak rigidity two-axis four-frame photoelectric detection equipment, including sensor group, by the inner azimuth axis and the inner azimuth frame connection the inner azimuth axis system, by the inner pitch axis and the inner pitch frame connection the inner pitch axis system, by the outer pitch axis and the outer pitch frame connection the outer pitch axis system and by the outer azimuth axis and the outer azimuth frame connection the outer azimuth axis system, the sensor group mainly by infrared sensor, reference mirror, television sensor and laser ranging sensor are connected, and the sensor group is connected with the inner pitch frame through the sensor support, and the left and right sides of the inner pitch axis system are connected angle measuring shaft end and motor shaft end respectively, the angle measuring shaft end and motor shaft end are connected by height calibration tool fastening and realize the installation surface isofacial.

[0007] The weak rigidity two-axis four-frame photoelectric detection equipment, the height difference of the two ends of the inner pitch axis system is not more than 0.03mm.

[0008] The weak rigidity two-axis four-frame photoelectric detection equipment, and the height calibration tool is connected with the angle measuring shaft end and the motor shaft end through the pin respectively.

[0009] The gap between the motor shaft end of the inner tilt axis system and the stop opening of the inner tilt frame is not less than 1mm.

[0010] Further, the inner azimuth frame, the inner tilt frame, the outer tilt frame, the outer azimuth frame and the sensor support are all made of aluminum alloy.

[0011] The angle measuring shaft end and the motor shaft end are fastened and connected by the height calibration tooling to realize the same height of the mounting surface, the stability problem of the weak rigid structure is solved, the height difference of the two ends is ensured to be within 0.03mm, the parallelism of the optical axis is realized to be within 20", the inner tilt axis system adopts the gap fit, the influence on the optical axis stability of the sensor group is reduced, the internal stress of the sensor group is eliminated, and the optical axis stability is improved. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 It is a structural schematic view of a traditional two-axis four-frame photoelectric detection device;

[0013] Figure 2 It is a structural schematic view of the utility model;

[0014] Figure 3 It is a calibration operation schematic view of the sensor group of the utility model;

[0015] Figure 4 It is a calibration operation schematic view of the inner frame of the utility model.

[0016] The reference signs are as follows: 11-inner azimuth axis system, 13-inner tilt axis system, 14-height calibration tooling, 2-sensor group, 21-infrared sensor, 22-reference mirror, 23-television sensor, 24-laser ranging sensor, 25-autocollimator, 26-target plate, 27-aspheric mirror, 28-parallel light pipe. DETAILED DESCRIPTION

[0017] The utility model will be further described in combination with the drawings and specific embodiments.

[0018] Figure 1 The two-axis four-frame photoelectric detection structure is shown, the inner azimuth axis and the inner azimuth frame are connected with the outer tilt axis and the outer tilt frame, the inner tilt axis and the inner tilt frame are connected with the inner azimuth axis and the inner azimuth frame, and the outer tilt axis and the outer tilt frame are connected with the outer azimuth axis and the outer azimuth frame. The rotation angle of the inner azimuth axis system and the inner tilt axis system is relatively small (generally ±1.5°), the shaft wobble of the axis system and the angle measuring accuracy cannot be measured, therefore, the small gap stop opening fit is generally used for direct fixed connection of the connection of each place in the two-axis four-frame, but the sensor support of the project is weak in rigidity, is easily affected by the inner frame axis system to produce deformation, and the optical axis stability is poor.

[0019] Referring to Figure 2 The utility model discloses a weak rigidity two -axis four frame photoelectric detection equipment, including sensor group, by the inner azimuth axis and the inner azimuth frame connection into the inner azimuth axle 11, by the inner pitch axis and the inner pitch frame connection into the inner pitch axle 13, by the outer pitch axis and the outer pitch frame connection into the outer pitch axle and by the outer azimuth axis and the outer azimuth frame connection into the outer azimuth axle, on this basis, the sensor group 2 mainly consists of infrared sensor 21, reference mirror 22, television sensor 23 and laser ranging sensor 24, the sensor group is connected with the inner pitch frame through the sensor support, and the left and right sides of the inner pitch axle 13 are connected with the angle measuring axle end and the motor axle end respectively, the angle measuring axle end and the motor axle end are connected tightly through the height calibration tool 14 to realize the installation surface isofacies, specifically, the motor axle end of the inner pitch axle 13 and the stopper of the inner pitch frame are changed from small gap cooperation to big gap (1mm), the installation surface height difference of the motor end and the angle measuring end of the inner pitch axle 13 and the sensor support is controlled to be within 0.03mm through the height calibration tool 14 of additional, and the position is adjusted using the pin fastening.

[0020] The inner azimuth frame, the inner pitch frame, the outer pitch frame, the outer azimuth frame and the sensor support of the two-axis four-frame structure photoelectric product corresponding to the patent application adopt aluminum alloy materials with thin thickness and light weight, and after optical axis calibration, the optical axis stability of the product is good, and high-precision pointing accuracy and tracking accuracy can be provided.

[0021] The weak rigidity two-axis four-frame structure integrates each component, clearly defines the internal reference of each component and the transmission mode, and ensures that the optical axis of the product can withstand environmental tests.

[0022] The method for calibrating the sensor group 2 of the utility model is shown as Figure 3 As shown in the figure, taking the reference mirror 22 as the reference, using the autocollimator 25 for autocollimation, rotating 180 degrees in azimuth, aiming at the parallel light pipe 28, installing the infrared sensor 21, adjusting the installation surface angle (flatness ≤0.02mm) of the infrared sensor 21, calibrating the optical axis of the infrared sensor 21 to coincide with the target of the parallel light pipe 28, and the error is ≤5". Then install the television sensor 23, adjust the installation surface angle (flatness ≤0.02mm) of the television sensor 23, calibrate the parallelism of the optical axes of the television sensor 23 and the infrared sensor 21 ≤5". The laser ranging sensor 24 is powered on, emits laser, and calibrates the parallelism of the laser ranging emission optical axis and the optical axis of the infrared sensor 21 ≤5" through the aspheric mirror 27 and the target plate 26. After optical axis calibration, the sensor group 2 is placed in a sealed test cylinder to carry out high-low temperature cycle test, eliminate the sensor installation stress of the sensor group 2, and ensure the stability of the optical axis parallelism.

[0023] The method for calibrating the inner frame of the utility model is shown as Figure 4As shown, the sensor group 2 is placed into the inner frame pitch axis system 1, the autocollimator theodolite 33 is collimated with the reference mirror 22, the azimuth is rotated by 180 degrees, the collimator 28 is aimed, the sensor group 2 is powered to align the collimator 28 to form an image, as a light axis monitoring mode for installing and fastening the sensor group 2, then the connection between the inner frame pitch axis system 1 and the sensor group 2 is fastened to ensure that the collimator does not deviate during assembly. After installation, the inner frame is placed into the sealed test cylinder to carry out high-low temperature cycle test, eliminate assembly stress and ensure the stability of the parallel light axis.

[0024] In the sensor group 2 calibration process, the installation surface flatness (≤0.02mm) of each sensor can be detected to reduce the assembly stress caused by the installation of the sensor. After calibration, the sensor group 2 is subjected to high-low temperature cycle test to release the assembly stress of the sensor installation. When the sensor group and the inner pitch of the inner frame are connected, the light axis monitoring link is added to quantify the assembly stress of this link through optical imaging, reduce the influence of the assembly stress of the connection position on the stability of the light axis, and ensure that the installation surface of the inner pitch axis system does not affect the stability of the light axis of the sensor group.

[0025] By analyzing various factors affecting the stability of the light axis of the weak rigid sensor group 2, the influence relationship of each influencing factor is determined, and corresponding processing measures are proposed. The front and rear relationship of each processing measure is analyzed, the calibration order of each measure is formulated, and the stress release link is added to ensure that the light axis of the sensor group 2 of the product remains stable after high-low temperature and vibration tests. The problem of unstable light axis caused by the low rigidity of the product and the deformation of the sensor group 2 is solved.

[0026] The above embodiments only exemplarily illustrate the principle and effect of the present application, and part of the embodiments used, for those skilled in the art, without departing from the creative concept of the present application, a number of modifications and improvements can be made, which belong to the protection scope of the present application.

Claims

1. A weakly rigid two-axis four-frame optoelectronic detection device comprising a sensor group (2), an inner azimuth axis system (11) connected by an inner azimuth axis and an inner azimuth frame, an inner pitch axis system (13) connected by an inner pitch axis and an inner pitch frame, an outer pitch axis system connected by an outer pitch axis and an outer pitch frame, and an outer azimuth axis system connected by an outer azimuth axis and an outer azimuth frame, characterized in that, The sensor group (2) is composed of an infrared sensor (21), a reference mirror (22), a television sensor (23) and a laser ranging sensor (24), the sensor group (2) is connected with the inner pitch frame through a sensor support, the left and right sides of the inner pitch shaft system (13) are respectively connected with an angle measuring shaft end and a motor shaft end, and the angle measuring shaft end and the motor shaft end are tightly connected through a height calibration tool (14).

2. A weak rigid two-axis four-frame photodetector device according to claim 1, characterized in that, The height difference of the two end mounting surfaces of the inner pitch shaft system (13) is not greater than 0.03 mm.

3. A weak rigid two-axis four-frame photodetector device according to claim 1, wherein, The height calibration tool (14) is connected with the angle measuring shaft end and the motor shaft end through pins.

4. The weak rigid two-axis four-frame photodetector device according to claim 1 or 2 or 3, characterized in that, The gap between the motor shaft end of the inner pitch shaft system (13) and the stop opening of the inner pitch frame is not less than 1 mm.

5. A weakly rigid two-axis four-frame photodetection device according to claim 4, wherein, The inner orientation frame, the inner pitch frame, the outer pitch frame, the outer orientation frame and the sensor support are all made of aluminum alloy.

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