Array FLDI integrated receiving mechanism

Abstract

The invention discloses an integrated receiving mechanism of an array type FLDI, belongs to the field of fluid mechanics measurement, and is applied to an array type focused laser differential interference measurement system in a wind tunnel test. The invention aims to solve the problems of complicated equipment, complicated operation, large occupied space, high cost, low efficiency and easy loss of optical signals in the traditional array FLDI measurement scheme. According to the mechanism, an array type photoelectric chip is arranged at the tail end of a receiving light path, a front photosensitive area of the chip comprises a plurality of independent photosensitive units which are in one-to-one correspondence with light measuring points and synchronously complete light-electric signal conversion, and a back PCB pin is connected with an anti-interference line to stably export an electric signal; the chip is installed on the optical bench underframe through the sliding table capable of being adjusted back and forth and the connecting rod capable of being adjusted in height, and the adaptability is high. The receiving device is simplified, the signal loss is reduced, the measurement efficiency and precision are improved, and reliable support is provided for aerodynamic characteristic measurement of the aircraft.

Description

Technical Field

[0001] This invention relates to the field of fluid dynamics measurement, specifically to an integrated receiving mechanism for an array-type FLDI. Background Technology

[0002] The integrated receiver mechanism of an array-type FLDI (Focused Laser Differential Interferometry) system is a crucial component of the receiver end of an array-type focused laser differential interferometry system. It plays a vital role in wind tunnel testing, primarily in the aerospace field. Based on traditional focused laser differential interferometry, it incorporates array technology to achieve high-precision measurement of the aerodynamic characteristics of aircraft surfaces. By simulating airflow environments under different flight conditions in a wind tunnel, the system can accurately observe and record surface deformation and airflow distribution of the aircraft under various aerodynamic conditions, providing critical data for aircraft design optimization, aerodynamic performance evaluation, and structural improvements. The application of this measurement system ensures that the aircraft achieves optimal performance in actual flight and improves the efficiency and accuracy of wind tunnel testing.

[0003] Existing array-based focused laser differential interferometry (FLDI) techniques suffer from limitations due to the small spacing between measurement points in an array-like distribution. Furthermore, traditional photodetectors cannot simultaneously measure multiple measurement points, necessitating a method of first expanding the measurement points and then using fiber optic probes to receive and transmit the signals to the photodetector. This approach involves numerous devices, complex procedures, large space requirements, high costs, low efficiency, and cannot avoid signal loss at the measurement points. Therefore, an integrated receiving mechanism for array-based FLDI has emerged. This mechanism directly receives the optical signals from the array-distributed measurement points, replacing the cumbersome receiving devices at the receiver end. It effectively addresses signal loss at the measurement points, simplifies operation, saves space, and improves efficiency. Summary of the Invention

[0004] The purpose of this invention is to provide an integrated receiving mechanism for an array-type FLDI to solve the problems in the background art where traditional photodetector chips cannot simultaneously measure signals from multiple optical measurement points, resulting in numerous devices, complex operation procedures, large space occupation, high cost, low efficiency, and the inability to avoid loss of optical signals at measurement points.

[0005] To achieve the above objectives, the present invention provides the following technical solution: an integrated receiving mechanism for an array-type FLDI, wherein an array-type optoelectronic chip is provided at the end of the receiving optical path, the array-type optoelectronic chip includes a PCB board on the back and a photosensitive area on the front, the photosensitive area is configured as multiple independent photosensitive units, each photosensitive unit corresponds to a light measurement point, and individually converts the received optical signal into an electrical signal.

[0006] Preferably, it also includes an optical bench base, a connecting rod, and a slide. The array of photoelectric chips is mounted on the connecting rod, and the bottom of the connecting rod is mounted on the slide. The slide has a front-to-back adjustment degree of freedom relative to the optical bench base, and the connecting rod can be height adjusted relative to the slide.

[0007] Preferably, the photosensitive area of ​​the array-type optoelectronic chip is adapted to the distribution density of the light measurement points to achieve synchronous acquisition of signals from multiple points.

[0008] Preferably, the array-type optoelectronic chip has multiple pins on the back PCB board, and the pins are connected to external anti-interference lines to stably export the electrical signals converted by each independent photosensitive unit on the chip.

[0009] Preferably, the receiving mechanism is a component of the receiving end of the array-type focused laser differential interferometry system and is used in wind tunnel testing in conjunction with the array-type focused laser differential interferometry system.

[0010] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0011] 1. Enables simultaneous acquisition of signals from multiple points. The photosensitive units of the array-type optoelectronic chip correspond one-to-one with the optical measurement points and are adapted to the distribution density, breaking through the limitation of traditional photodetectors that cannot simultaneously measure signals from multiple measurement points, thus greatly improving measurement efficiency.

[0012] 2. Reduce optical signal loss and interference. An integrated direct receiving structure is adopted to replace cumbersome beam expanders and fiber optic transmission devices, avoiding signal transmission loss; anti-interference lines are connected to the pins of the rear PCB to ensure stable output of electrical signals and improve measurement accuracy.

[0013] 3. Simplified structure and reduced costs. Integrated design reduces the number of devices, saves installation space, simplifies operation processes, and reduces system setup and maintenance costs.

[0014] 4. Flexible adjustment and strong adaptability. The array-type optoelectronic chip is installed through a slide that can be adjusted forward and backward and a connecting rod that can be adjusted in height. It can be flexibly adjusted in position according to the distribution requirements of optical measurement points in different wind tunnel tests, making it more adaptable.

[0015] 5. Facilitates efficient wind tunnel testing. As a core receiving component of the array-type FLDI system, it effectively supports high-precision measurement of the aerodynamic characteristics of the aircraft surface, providing reliable data for aircraft design optimization and performance evaluation, and further enhancing the practicality and accuracy of wind tunnel testing. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of an array-type focused laser differential interferometry system.

[0017] Figure 2 This is an external diagram of an array-type optoelectronic chip;

[0018] Figure 3 This is a structural diagram of an array-type optoelectronic chip. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] Example 1

[0021] like Figure 1 As shown, the array-type focused laser differential interferometry system includes a transmitting optical path and a receiving optical path. The transmitting optical path includes, in sequence, a coherent light source generator, a concave lens, a diffractive optical element, a polarizer, a Wollaston prism, and a convex lens. The diffractive optical element splits the cone-shaped beam diverged by the concave lens into multiple beams, which are then filtered out by the polarizer to remove interference. The Wollaston prism splits each linearly polarized beam into two beams with a certain separation angle, mutually perpendicular polarization directions, and equal intensity. The convex lens then converges the diverged beams into multiple pairs of separate focal points in the observation area. The receiving optical path includes, in sequence, a convex lens, a Wollaston prism, a polarizer, a concave lens, and an array-type photoelectric chip.

[0022] The optical components for the transmitting and receiving optical paths are mounted on connecting rods, which are then mounted on slides. All slides are mounted together on a single optical bench base. The height and spacing of each component are adjustable. Specifically, the slides have a forward and backward adjustment degree relative to the optical bench base, and the connecting rods are height-adjustable relative to the slides.

[0023] like Figure 3 As shown, the array-type optoelectronic chip includes a PCB board on the back and a photosensitive area on the front. The photosensitive area is set with multiple independent photosensitive units, each corresponding to a photometric point, and converts the received light signal into an electrical signal individually. The array-type optoelectronic chip used in this embodiment is a silicon ADP array, model Hamamatsu S15249, which contains 16 photosensitive units (ch1~ch16) and 16 corresponding pins on the back (1~8 and 10~17). The pins are connected to external anti-interference lines to stably export the electrical signals converted by each independent photosensitive unit on the chip.

[0024] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An integrated receiver mechanism for an array-type FLDI, characterized in that: An array of photoelectric chips is set at the end of the receiving optical path. The array of photoelectric chips includes a PCB board on the back and a photosensitive area on the front. The photosensitive area is set as multiple independent photosensitive units. Each photosensitive unit corresponds to a light measurement point and converts the received optical signal into an electrical signal individually.

2. The integrated receiver mechanism for array-type FLDI according to claim 1, characterized in that: It also includes an optical bench base, a connecting rod, and a slide. The array of photoelectric chips is mounted on the connecting rod, and the bottom of the connecting rod is mounted on the slide. The slide has a front-to-back adjustment degree of freedom relative to the optical bench base, and the connecting rod can be height adjusted relative to the slide.

3. The integrated receiver mechanism for array-type FLDI according to claim 1, characterized in that: The photosensitive area of ​​the array-type optoelectronic chip is adapted to the distribution density of the light measurement points, enabling synchronous acquisition of signals from multiple points.

4. The integrated receiver mechanism for array-type FLDI according to claim 1, characterized in that: The array-type optoelectronic chip has multiple pins on its back PCB board. The number of pins matches the number of photosensitive units. The pins are connected to external anti-interference lines to stably export the electrical signals converted by each independent photosensitive unit on the chip.

5. An application of an integrated receiving mechanism for an array-type FLDI as described in any one of claims 1-4, characterized in that: This receiving mechanism is a component of the receiving end of the array-type focused laser differential interferometry system. It is used in conjunction with the system for wind tunnel testing in the aerospace field to measure the aerodynamic characteristics of aircraft surfaces.

Images