CN205212948U

CN205212948U - Double vision field thermal imaging system

Info

Publication number: CN205212948U
Application number: CN201521092020.2U
Authority: CN
Inventors: 高倩; 丁鉴彬; 牛慧卓; 张帆
Original assignee: Shandong Sheenrun Optics Electronics Co Ltd
Current assignee: Shandong Sheenrun Optics Electronics Co Ltd
Priority date: 2015-12-25
Filing date: 2015-12-25
Publication date: 2016-05-04
Anticipated expiration: 2025-12-25

Abstract

The utility model discloses a double vision field thermal imaging system, including hot imaging lens, infrared detector, signal processing and control circuit and servo motor control system, signal processing and control circuit comprise FPGA controller circuit, image processing circuit and power supply circuit, the servo motor control system comprises focus positioning control ware, servo motor, motor -drive circuit and encoder, accomplishes the switching and focus function of big visual field and little visual field. The utility model discloses a double vision field thermal imaging system, through setting up the servo motor control system of compriseing focus positioning control ware, servo motor and encoder, focus positioning control ware orders about hot imaging lens through servo motor and focuses, and the output signal through the encoder obtains the positional information of encoder, focuses on in order realizing.

Description

A kind of double-view field thermal imager

Technical field

The utility model relates to a kind of double-view field thermal imager, in particular, particularly relates to a kind of mountain-climbing searching algorithm of focus criteria function and optimization that adopts and carries out focusing on the double-view field thermal imager judged.

Background technology

In the infraed early warning system of low latitude, need the optical system of thermal infrared imager can work under various modes, with the search of completion system to target, the function aiming at and follow the tracks of.Fixed-focus system is difficult to meet the demands, and continuous vari-focus system is best selection, but difficulty is in design comparatively large, and dual field-of-view infrared optical system is a kind of simple and practical approach realizing above-mentioned requirements.Double-view field thermal imager can be used for observing large scene areas under Large visual angle pattern, search suspected target; Under small field of view pattern, can be used for examining or amplification target, target is identified, follow the tracks of and aim at, complete fixed-focus system impossible mission.

We find, existing double-view field thermal imager is in debugging and use procedure, and use is after focal length locates a period of time, gear is due to long wearing and tearing, the error that gap between gear can increase and cause focal length to locate, thus it is inaccurate to cause focal length to be located, not fogging clear problem.Traditional manual focusing relies on range estimation and the hand adjustment of people, length consuming time, repeatable little, and Adjustment precision is comparatively large by people's subjective impact, is unfavorable for realizing the automatic focus after Large visual angle and small field of view switch.

Summary of the invention

The utility model, in order to overcome the shortcoming of above-mentioned technical problem, provides a kind of double-view field thermal imager.

Double-view field thermal imager of the present utility model, comprise imaging lens, Infrared Detectors, signal transacting and control circuit and servo control system, the infrared light of extraneous radiation converges on the photosurface of Infrared Detectors by imaging lens, the light signal of reception is converted into the signal of telecommunication by Infrared Detectors, and inputs in signal transacting and control circuit; Signal transacting and control circuit, by the process to the infrared image gathered, send a control signal to servo control system, and servo control system performs Large visual angle and small field of view switches and focus movement; It is characterized in that: described signal transacting and control circuit are made up of FPGA controller circuit, image processing circuit and power circuit, image processing circuit amplifies and A/D conversion process the analog video signal that Infrared Detectors exports, and the work that power circuit is thermal imager provides stable voltage;

The encoder that described servo control system is measured by focal length register control, servomotor, motor-drive circuit and the rotational angle to servomotor forms, focal length register control, according to the value of feedback of encoder, controls switching and focusing function that servomotor completes Large visual angle and small field of view.

Double-view field thermal imager of the present utility model, described FPGA controller circuit is connected with communicating circuit and key control circuit, and communicating circuit comprises RS232 communication module, RS485 communication module and RS422 communication module; Be provided with buffer circuit between described focal length register control and motor-drive circuit, to ensure the even running of servomotor, the output of servomotor orders about the Large visual angle of imaging lens through reduction box and small field of view switches and focus movement.

The beneficial effects of the utility model are: double-view field thermal imager of the present utility model, by arranging the signal transacting and control circuit that are made up of image processing circuit, FPGA controller circuit, after the analog signal that Infrared Detectors exports by image processing circuit carries out amplification and A/D conversion, input in FPGA controller circuit, to realize the process of infrared image; By arranging the servo control system be made up of focal length register control, servomotor and encoder, focal length register control orders about imaging lens by servomotor and focuses, the positional information of encoder is obtained, to realize focusing on by the output signal of encoder.

Accompanying drawing explanation

Fig. 1 is the schematic diagram of double-view field thermal imager of the present utility model;

Fig. 2 is the schematic diagram of signal transacting and control circuit in the utility model, servo control system;

In figure: 1 imaging lens, 2 Infrared Detectorss, 3 signal transacting and control circuit, 4 servo control systems, 5FPGA controller circuitry, 6 image processing circuits, 7 power circuits, 8 focal length register controls, 9 motor-drive circuits, 10 servomotors, 11 encoders, 12 communicating circuits, 13 key control circuit, 14 buffer circuits, 15 reduction boxes.

Embodiment

Below in conjunction with accompanying drawing and embodiment, the utility model is described in further detail.

As shown in Figure 1, give the schematic diagram of double-view field thermal imager of the present utility model, it is made up of with control circuit 3 and servo control system 4 imaging lens 1, Infrared Detectors 2, signal transacting, optical system is provided with in imaging lens 1, and visual field switching and focusing can be carried out under the control of servo control system 4, Infrared Detectors 2 is arranged at the rear end of imaging lens 1, and it can adopt infrared focal plane detector.In the infrared light imaging lens 1 of extraneous radiation, the focusing of optical system, converges on the photosurface of Infrared Detectors 2.

Light signal is converted to the charge packet be directly proportional to incident light by Infrared Detectors 2, and convert one group of vision signal exported according to the order of sequence in time to through reading circuit, this signal is through analog circuitry processes, after A/D conversion, in the signal transacting inputing to rear end again and control circuit 3, to complete corresponding process.

As shown in Figure 2, give signal transacting and control circuit in the utility model, the schematic diagram of servo control system, shown signal transacting and control circuit 3 are by image processing circuit 6, FPGA controller circuit 5, power circuit 7, key control circuit 13 and communicating circuit 12 form, the analog video that Infrared Detectors 2 exports mainly amplifies by image processing circuit 6, one tunnel is as the output of video, another road again through analog/digital conversion be digital video signal, digital signal inputs in FPGA controller circuit, by the process to digital picture, realize automatic focus.

The Power supply that outside inputs is converted into system modules required voltage value by power circuit 7, and the voltage of externally fed power supply is+12V, and power circuit is translated into the direct voltage of+5V ,+3.3V ,+1.8V ,+1.2V.In order to ensure the fail safe of equipment, in power circuit, also can add anti-reverse power connection circuit, to improve the reliability of system.In order to provide abundant external interface, communicating circuit 12 is made up of RS232 communication module, RS485 communication module and RS422 communication module, and user as required, can select different communication modes.Namely key control circuit is connected with FPGA controller circuit 5 by RS232, RS485 or RS422 interface, and the form be directly connected with FPGA controller circuit 5 also can be adopted to realize.

Shown servo control system 4 is made up of focusing register control 8, motor-drive circuit 9, servomotor 10, encoder 11, buffer circuit 14 and reduction box 15, shown focusing register control 8 is made up of microcontroller, it has collection, computing and output function, motor-drive circuit 9 is for directly ordering about the operation of servomotor 10, the motor control signal focusing on register control 8 output inputs in motor-drive circuit 9, to ensure the even running of servomotor 10 after the process of buffer circuit 14.Encoder 11 is arranged at the output of servomotor 10, for feeding back in focal length register control 8 by the position signalling of servomotor 10; Imaging lens 1 zoom motion is ordered about in the output of servomotor 10 after the deceleration of reduction box 15.

Claims

1. a double-view field thermal imager, comprise imaging lens (1), Infrared Detectors (2), signal transacting and control circuit (3) and servo control system (4), the infrared light of extraneous radiation converges on the photosurface of Infrared Detectors by imaging lens, the light signal of reception is converted into the signal of telecommunication by Infrared Detectors, and inputs in signal transacting and control circuit; Signal transacting and control circuit, by the process to the infrared image gathered, send a control signal to servo control system, and servo control system performs Large visual angle and small field of view switches and focus movement; It is characterized in that: described signal transacting and control circuit are made up of FPGA controller circuit (5), image processing circuit (6) and power circuit (7), image processing circuit amplifies and A/D conversion process the analog video signal that Infrared Detectors exports, and the work that power circuit is thermal imager provides stable voltage;

Described servo control system is made up of focal length register control (8), servomotor (10), motor-drive circuit (9) and the encoder (11) measured the rotational angle of servomotor, focal length register control, according to the value of feedback of encoder, controls switching and focusing function that servomotor completes Large visual angle and small field of view.

2. double-view field thermal imager according to claim 1, it is characterized in that: described FPGA controller circuit (5) is connected with communicating circuit (12) and key control circuit (13), and communicating circuit comprises RS232 communication module, RS485 communication module and RS422 communication module; Buffer circuit (14) is provided with between described focal length register control (8) and motor-drive circuit (9), to ensure the even running of servomotor (10), the output of servomotor orders about the Large visual angle of imaging lens through reduction box (15) and small field of view switches and focus movement.