CN-121994445-A - Integrated receiving mechanism of array FLDI

CN121994445ACN 121994445 ACN121994445 ACN 121994445ACN-121994445-A

Abstract

The invention discloses an integrated receiving mechanism of an array FLDI, which belongs to the field of hydrodynamic measurement and is applied to an array focusing laser differential interferometry system in a wind tunnel test. The method aims at solving the problems of complicated equipment, complex operation, large occupied space, high cost, low efficiency and easy loss of optical signals in the traditional array FLDI measurement scheme. The mechanism is characterized in that an array photoelectric chip is arranged at the tail end of a receiving light path, a plurality of independent photosensitive units are arranged in a photosensitive area on the front side of the chip, the photosensitive units are in one-to-one correspondence with optical measuring points and synchronously complete optical-electrical signal conversion, pins of a back PCB (printed circuit board) are connected with anti-interference wires to stably lead out electrical signals, and the chip is mounted on an optical bench underframe through a sliding table capable of being adjusted back and forth and a connecting rod capable of being adjusted in height, so that the adaptability is high. The invention simplifies the receiving device, reduces signal loss, improves measurement efficiency and precision, and provides reliable support for the measurement of the aerodynamic characteristics of the aircraft.

Inventors

ZHU YIDING

Assignees

北京大学

Dates

Publication Date: 20260508
Application Date: 20260224

Claims (5)

1. An integrated receiving mechanism of an array FLDI is characterized in that an array photoelectric chip is arranged at the tail end of a receiving light path, the array photoelectric chip comprises a back PCB and a front photosensitive area, the photosensitive area is arranged into a plurality of independent photosensitive units, each photosensitive unit corresponds to one optical measuring point, and received optical signals are converted into electric signals independently.
2. The integrated receiving mechanism of claim 1, further comprising an optical bench chassis, a connection rod, and a sliding table, wherein the array type photoelectric chip is mounted on the connection rod, the bottom of the connection rod is mounted on the sliding table, the sliding table has a degree of freedom of adjusting in a front-back direction relative to the optical bench chassis, and the connection rod can be adjusted in height relative to the sliding table.
3. The integrated receiving mechanism of the array FLDI of claim 1, wherein the photosensitive area of the array photoelectric chip is matched with the distribution density of the optical measurement points, so that multi-point signal synchronous acquisition is realized.
4. The integrated receiving mechanism of the array FLDI of claim 1, wherein a plurality of pins are arranged on a PCB (printed circuit board) on the back of the array photoelectric chip, the number of the pins is matched with that of the photosensitive units, and the pins are connected with external anti-interference wires to stably guide out electric signals converted by the independent photosensitive units on the chip.
5. An integrated receiving structure of array FLDI as defined in any one of claims 1 to 4, wherein the receiving structure is a component of a receiving end of an array focusing laser differential interferometry system, and the integrated receiving structure is used for wind tunnel test in the aerospace field to measure aerodynamic characteristics of an aircraft surface.

Description

Integrated receiving mechanism of array FLDI Technical Field The invention relates to the field of hydrodynamic measurement, in particular to an integrated receiving mechanism of an array FLDI. Background The integrated receiving mechanism of the array FLDI is an important component of the receiving end of the array focusing laser differential interferometry system, plays an important role in wind tunnel test in cooperation with the array focusing laser differential interferometry system, and is mainly applied to the field of aerospace. Based on the traditional focusing laser differential interferometry, the high-precision measurement of the aerodynamic characteristics of the surface of the aircraft is realized by introducing an array technology. According to the system, through simulating airflow environments under different flight conditions in the wind tunnel, the surface deformation and airflow distribution of the aircraft under various aerodynamic conditions can be accurately observed and recorded, so that key data are provided for design optimization, aerodynamic performance evaluation and structural improvement of the aircraft. The application of the measuring system ensures that the aircraft can achieve the best performance in actual flight, and improves the efficiency and accuracy of wind tunnel tests. The existing array focusing laser differential interferometry technology can only adopt a scheme of firstly expanding measuring points and then receiving and transmitting the measuring points to a photoelectric detector by using an optical fiber probe because the measuring points are distributed in an array manner and the distance is small and because the traditional photoelectric detector photosensitive chip cannot synchronously measure signals of a plurality of optical measuring points. The scheme involves more equipment, has complex operation flow, large occupied space, high cost and low efficiency, and cannot avoid the loss of the measuring point optical signals. An integrated receiving mechanism of the array FLDI is thus created. The mechanism directly receives the measuring point optical signals distributed in an array mode, replaces a receiving device with a complex receiving end, can well solve the loss of the measuring point optical signals, simplifies the operation, saves the space and improves the efficiency. Disclosure of Invention The invention aims to provide an integrated receiving mechanism of an array FLDI, which solves the problems that in the background technology, a traditional photoelectric detector photosensitive chip cannot synchronously measure a plurality of optical measuring point signals, so that the equipment is more, the operation flow is complex, the occupied space is large, the cost is high, the efficiency is low, and the loss of the measuring point optical signals cannot be avoided. In order to achieve the above purpose, the invention provides the technical scheme that an integrated receiving mechanism of an array FLDI is provided, an array photoelectric chip is arranged at the tail end of a receiving light path, the array photoelectric chip comprises a back PCB and a front photosensitive area, the photosensitive area is provided with a plurality of independent photosensitive units, each photosensitive unit corresponds to one optical measuring point, and the received optical signals are converted into electric signals independently. Preferably, the device further comprises an optical bench underframe, a connecting rod and a sliding table, wherein the array type photoelectric chip is arranged on the connecting rod, the bottom of the connecting rod is arranged on the sliding table, the sliding table has a front-back direction adjusting degree of freedom relative to the optical bench underframe, and the height of the connecting rod can be adjusted relative to the sliding table. Preferably, the photosensitive area of the array type photoelectric chip is matched with the distribution density of the optical measurement points, so that synchronous acquisition of multi-point signals is realized. Preferably, a plurality of pins are arranged on the PCB at the back of the array photoelectric chip, the pins are connected with external anti-interference wires, and the electric signals converted by the independent photosensitive units on the chip are stably led out. Preferably, the receiving mechanism is a component part of a receiving end of the array type focusing laser differential interferometry system, and is matched with the array type focusing laser differential interferometry system to be applied to wind tunnel tests. Compared with the prior art, the invention has the following beneficial effects: 1. And realizing synchronous acquisition of multi-point signals. The photosensitive units of the array type photoelectric chip are in one-to-one correspondence with the optical measuring points and adapt to the distribution density, so that the limitation that the traditional photo