CN216134526U

CN216134526U - High-speed data acquisition device of infrared camera front end

Info

Publication number: CN216134526U
Application number: CN202121893868.0U
Authority: CN
Inventors: 林长青; 周双喜; 孙胜利; 李璐芳; 喻琪超
Original assignee: Shanghai Institute of Technical Physics of CAS
Current assignee: Shanghai Institute of Technical Physics of CAS
Priority date: 2021-08-13
Filing date: 2021-08-13
Publication date: 2022-03-25
Anticipated expiration: 2031-08-13

Abstract

The utility model belongs to the technical field of data acquisition equipment, and discloses a front-end high-speed data acquisition device of an infrared camera, which comprises a multi-channel analog signal conditioning device, a multi-channel signal channel acquisition device, a time sequence control and data acquisition device, a multi-channel high-speed data transmission device, a power supply device, a mechanical structure and a thermal control device; the multi-channel analog signal conditioning device comprises a first filter, a follower, a second filter, a background level regulator and a main amplifier; the multi-channel signal channel acquisition device comprises an A/D converter array and a D/A converter array; the time sequence control and data acquisition device comprises a first FPGA processor, a second FPGA processor and a memory. The utility model has good expansibility, is suitable for being applied to a large-scale space infrared camera stared at a high frame frequency, can also be applied to a space infrared camera adopting a light machine to scan in a reciprocating way, and is beneficial to the further development of a remote sensing technology.

Description

High-speed data acquisition device of infrared camera front end

Technical Field

The utility model belongs to the technical field of data acquisition equipment, and particularly relates to a front-end high-speed data acquisition device of an infrared camera.

Background

At present: the core device of a modern infrared imaging system is a Focal Plane Array (FPA), and with the continuous improvement of the demand of human beings on the remote sensing field, especially the pursuit of high time resolution, high spatial resolution, high sensitivity and high spectral resolution, the rapid development of the infrared focal plane device on performance, scale and imaging speed is further driven.

In recent years, with the development of infrared remote sensing technology, the scale of an infrared detector of a space infrared camera is expanded rapidly, and currently, large-scale infrared linear array detectors or area array detectors are gradually applied to satellite-borne infrared cameras at home and abroad, the scale of the linear array detectors reaches more than 2000 yuan, the scale of a single area array detector exceeds 1 Kx 1K pixels, and the highest frame frequency exceeds 50 frames. The JWST (James weber telescope) in foreign countries adopts 18 pieces of infrared detectors with 4K multiplied by 4K.

This has led to increased demands on the scale and speed of information acquisition and data acquisition circuits. Compared with the previous generation of infrared detector, the new generation of large-scale infrared detector has the following general requirements on the information acquisition circuit: and reading out 0.5 MHz-16 MHz and outputting an analog signal of 0-3.5V. Corresponding information acquisition circuits are often designed according to channels, each high-speed channel corresponds to a complete signal conditioning and acquisition circuit, a core processor of a modern high-speed acquisition circuit is generally an FPGA (field programmable gate array), and if an analog part and a digital time sequence circuit of the acquisition circuit are designed separately, as the number of paths is increased, more interfaces are needed for time sequence control, data access and the like, expansion is difficult, and the whole framework cannot be used due to requirement improvement; and if each channel is acquired by 1 FPGA, obviously, more resources are needed, and the requirements on resources such as power consumption, volume, weight and the like cannot be met. The satellite platform resources are extremely limited, so that the prior art route cannot meet performance indexes, and conflicts exist with the resource constraint of the platform, so that the development of the infrared information acquisition and processing technology is restricted.

Through the above analysis, the problems and defects of the prior art are as follows:

the existing infrared camera information acquisition and data acquisition method does not have modularization capability, the design is usually directly developed around technical indexes, the expandability is neglected, along with the increase of the number of paths or the increase of the scale of a detector and the improvement of sampling frequency, the original acquisition architecture cannot meet the requirements, the redesign is required to be overturned, the new design is easy to have problems in the test and experiment, the waste of design resources and the delay of progress are caused, and the method is not suitable for the information acquisition requirement of the existing large-scale infrared detector and cannot be matched with the development process of an infrared camera. On the other hand, conventional industrial bus technologies such as VPX are faced with digitizing high-speed signals at the back end, while large-scale interface schemes for the front-end sensor or detector end involve less effort, and are difficult to solve the high-speed quantization problem caused by large-scale detectors.

Therefore, the data acquisition device of the existing infrared camera cannot meet performance indexes, and conflicts with resource constraints of a platform exist, so that the development of infrared information acquisition and processing technology is restricted.

SUMMERY OF THE UTILITY MODEL

Aiming at the problems in the prior art, the utility model provides a front-end high-speed data acquisition device of an infrared camera.

The utility model is realized in such a way that the front-end high-speed data acquisition device of the infrared camera is provided with:

the system comprises a multi-channel analog signal conditioning device, a multi-channel signal channel acquisition device, a time sequence control and data acquisition device, a multi-channel high-speed data transmission device, a power supply device, a mechanical structure and a thermal control device;

the multi-channel analog signal conditioning device comprises a first filter, a follower, a second filter, a background level regulator and a main amplifier;

the multi-channel signal channel acquisition device comprises an A/D converter array and a D/A converter array;

the time sequence control and data acquisition device comprises a first FPGA processor, a second FPGA processor and a memory;

the multi-path high-speed data transmission device comprises a plurality of high-speed serial transceivers.

Furthermore, the multi-channel analog signal conditioning device, the multi-channel signal channel acquisition device, the time sequence control and data acquisition device and the multi-channel high-speed data transmission device are connected with the power supply device through connecting lines, and are connected with the mechanical structure and the thermal control device through mechanical installation.

Furthermore, the multi-channel analog signal conditioning device is connected with the large-scale infrared detector through a connecting circuit.

By combining all the technical schemes, the utility model has the advantages and positive effects that:

after the space infrared camera adopts the method to acquire information and data, each module can carry out program reconstruction, hundreds of paths of high-speed signals and hundreds of Gbps data can be acquired conveniently through the expansion of a plurality of modules, and the acquisition of the multi-path infrared detector high-speed signals of the space infrared camera can be realized by a small volume. Therefore, the utility model has the advantages of modularization and expandability, can effectively solve the problem that the scale of the infrared detector is continuously increased and the existing data acquisition architecture cannot adapt to, avoids the problems of continuous repeated design and retest verification, considers the requirements of high electromagnetic compatibility, low power consumption and circuit miniaturization of hundreds of signals in the data acquisition of the infrared camera, and solves the resource contradiction between the scale of the signal acquisition circuit of the ultra-large-scale infrared detector and the platform; the infrared camera has good expansion capability for observation imaging infrared cameras.

The utility model meets the requirements of large-scale infrared detector information acquisition and data acquisition, has good expansibility, is suitable for being applied to a large-scale space infrared camera staring at high frame frequency, can also be applied to a space infrared camera adopting an optical machine to perform reciprocating scanning, and is beneficial to the further development of a remote sensing technology.

The utility model can conveniently realize acquisition of hundreds of paths of high-speed signals and data up to hundreds of Gbps, and finally can realize acquisition of multi-path infrared detector high-speed signals of the space infrared camera with smaller volume. The problem that the existing data acquisition framework cannot adapt to the continuously-increased scale of the infrared detector is effectively solved, the problems of continuously repeated design and retest verification are avoided, the requirements of high electromagnetic compatibility, low power consumption and circuit miniaturization of hundreds of signals in the data acquisition of the infrared camera are met, and the resource contradiction between the scale of a super-large-scale infrared detector signal acquisition circuit and a platform is solved; the infrared camera has good expansion capability for observation imaging infrared cameras.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments of the present application will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present application, and it is obvious for those skilled in the art that other drawings can be obtained from the drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a front-end high-speed data acquisition device of an infrared camera provided in an embodiment of the present invention, where 1 is a mechanical structure, 2 is a thermal control device, 3 is a multi-channel analog signal conditioning module, 4 is a multi-channel signal channel acquisition module, 5 is a timing control and data acquisition module, and 6 is a multi-channel high-speed data transmission module.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the utility model and are not intended to limit the utility model.

In view of the problems in the prior art, the present invention provides a front-end high-speed data acquisition device for an infrared camera, which is described in detail below with reference to the accompanying drawings.

As shown in fig. 1, the front-end high-speed data acquisition device of an infrared camera provided in the embodiment of the present invention is composed of a configurable module, and the configurable module includes: the device comprises a multi-channel analog signal conditioning module, a multi-channel signal channel acquisition module, a time sequence control and data acquisition module, a multi-channel high-speed data transmission module, a power supply module, a mechanical structure and a thermal control module. The number of the channels in each module can be configured as required, program reconstruction can be carried out, collection of high-speed signals of a plurality of channels of infrared detectors of the space infrared camera can be finally achieved through a small-size and convenient design, stable acquisition of hundreds of high-speed signals and hundreds of Gbps data in a limited installation space of a space thermal environment can be conveniently achieved, and the problem of resource contradiction between the scale of a signal acquisition circuit of the ultra-large-scale infrared detector and a platform is solved.

The analog signal conditioning channel is realized by a multi-channel analog signal conditioning module and comprises a first filter, a follower, a second filter, a background level regulator and a main amplifier; the bandwidth of the filter is determined according to the sampling frequency S and is set to be 3-5 times of the sampling rate;

the signal acquisition channel consists of an A/D converter array and a D/A converter array, the A/D converter is used for converting analog signals of each channel into digital signals, the D/A converter is used for acquiring the background of the infrared instrument, feeding the background level regulator back to the front end and removing the instrument background; the A/D conversion rate is determined by the sampling frequency;

the FPGA processor selects an FPGA which can be applied to a space thermal environment and is provided with a high-speed SERDES interface; the memory is selected from SDRAM and FLASH.

The working principle of the utility model is as follows:

the utility model is based on the idea of task-based module multiplexing design, a multi-channel information acquisition module is constructed by combining electromechanical and thermal cooperative design through configurable module design, a single module can realize the data acquisition of 20Gbps with 80-channel 16MSPS sampling rate and 16-bit quantization digits, a multi-channel high-speed serial bus is adopted in the module for data transmission, each module can carry out program reconstruction, hundreds of channels of high-speed signals and hundreds of Gbps data can be acquired conveniently through the expansion of a plurality of modules, and finally the acquisition of the multi-channel high-speed signals of the space infrared camera and the multi-channel infrared detector can be realized by a small volume.

When the system is used, based on a task-based module multiplexing design idea, a data acquisition module configuration scheme is divided and formulated according to the size, power consumption resource constraint and data acquisition requirements of the space infrared camera; under the condition of meeting the space and power consumption requirements, the number of taps of the detector, namely the number M of input signal paths, the channel sampling rate S, the quantization bit number N, the number O of output paths and the output data rate R are main input conditions of the dividing module.

Then according to the division result, performing modular design on the analog signal conditioning channel and the signal acquisition channel, and selecting a core FPGA processing chip and an onboard memory array according to the interface requirement;

configuring a serial communication interface according to the multiplexing number of the modules and whether special requirements exist in the communication between the modules;

configuring a plurality of high-speed serial bus transceivers according to the data throughput rate of the modules; and finally, according to the power consumption service condition in the module, the power module is distributed and the cooperative design of machine installation and thermal control is carried out.

In the description of the present invention, "a plurality" means two or more unless otherwise specified; the terms "upper", "lower", "left", "right", "inner", "outer", "front", "rear", "head", "tail", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, should not be construed as limiting the utility model. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

The above description is only for the purpose of illustrating the present invention and the appended claims are not to be construed as limiting the scope of the utility model, which is intended to cover all modifications, equivalents and improvements that are within the spirit and scope of the utility model as defined by the appended claims.

Claims

1. The utility model provides a high-speed data acquisition device of infrared camera front end which characterized in that, high-speed data acquisition device of infrared camera front end is provided with:

2. The infrared camera front-end high-speed data acquisition device as claimed in claim 1, wherein the multiple analog signal conditioning devices, the multiple signal channel acquisition devices, the timing control and data acquisition device and the multiple high-speed data transmission device are all connected with the power supply device, the mechanical structure and the thermal control device through connection lines.

3. The infrared camera front-end high-speed data acquisition device as claimed in claim 1, wherein said multi-channel analog signal conditioning device is connected to the large-scale infrared detector through a connection line.