CN204705693U

CN204705693U - Small-sized Aviation cable fault detect orientator

Info

Publication number: CN204705693U
Application number: CN201520358644.8U
Authority: CN
Inventors: 吴希军; 赵彦鹏; 杜德琴; 荣博璇; 于洋
Original assignee: Yanshan University
Current assignee: Yanshan University
Priority date: 2015-05-29
Filing date: 2015-05-29
Publication date: 2015-10-14
Anticipated expiration: 2025-05-29

Abstract

The utility model object is openly a kind of small-sized detector that can be used in Aviation cable fault type and judge and locate, specifically utilize time domain reflectometry failure judgement type and carry out localization of fault by FPGA, it is characterized in that utilizing FPGA to convert Distance positioning to time interval measurement.Small-sized Aviation cable fault detect orientator mainly comprises on-site programmable gate array FPGA, pulse processing circuit and user interactive module, wherein, described FPGA produces transponder pulse to be undertaken amplifying rear output by transponder pulse amplifying circuit, reflected impulse is by carrying out localization of fault and type judgement in reflected impulse Acquisition Circuit Gather and input to FPGA, user interactive module is used for inputting and detects instruction and output detections result.The utility model is simple to operate, detection speed is fast, positioning precision is high, intelligence degree is high, structure is simple, volume is little, cost is low.

Description

Small-sized Aviation cable fault detect orientator

Technical field

The utility model relates to Airborne Survey field of analytic instrument, specifically, relates to a kind of small-sized Aviation cable fault detect orientator.

Background technology

Each systems such as Aviation cable is connected to electrically in interior of aircraft, avionics, communication, manipulation, being not only responsible for each system transmits electric power, but also provides safeguard with information interaction for controlling between each system, and therefore, Aviation cable is described as the nervous system of aircraft.The Aviation cable of interior of aircraft often can work under the various complex environments such as high temperature, low temperature, humidity, drying; many extraneous factors such as the chemical corrosion under rugged surroundings, physical friction can cause Aviation cable to wear and tear, aging, corrosion; Aviation cable finally can be caused to be short-circuited or open circuit fault; if can not repair in time, its consequence caused is hardly imaginable.

In recent years, China's major part Aviation Enterprise detected to Aviation cable the circuit diagram all provided according to aircraft factory and adopts the break-make insulation situation of the means such as multimeter, megohmmeter or pilot lamp to every root wire to detect, and not only wasted time and energy and also easily made mistakes.External Cable Fault Detection Technology comparative maturity, to cable short circuit and open circuit fault detection efficiency higher, but it is expensive.

Utility model content

The purpose of this utility model is just to provide a kind of small-sized Aviation cable fault detect orientator, have simple to operate, detection speed is fast, positioning precision is high, intelligence degree is high, structure is simple, volume is little, the low feature of cost.

The technical scheme that the utility model adopts is:

Small-sized Aviation cable fault detect orientator described in the utility model utilizes time domain reflectometry failure judgement type and carries out localization of fault by FPGA, it is characterized in that utilizing FPGA to convert Distance positioning to time interval measurement.Aviation cable fault detection system mainly comprises on-site programmable gate array FPGA, pulse processing circuit and user interactive module; Wherein, described FPGA produces transponder pulse to be undertaken amplifying rear output by transponder pulse amplifying circuit, reflected impulse is by carrying out localization of fault and type judgement in reflected impulse Acquisition Circuit Gather and input to FPGA, user interactive module is used for inputting and detects instruction and output detections result.

On-site programmable gate array FPGA is used for producing other transponder pulse of nanosecond and receives the reflected impulse that reflected impulse Acquisition Circuit collects, by the time delay collimation method ranging pulse time interval, then surveyed pulse interval is converted to positional information and carries out buffer memory, finally output to display screen display result.

Pulse processing circuit is made up of transponder pulse amplifying circuit and reflected impulse Acquisition Circuit, the low amplitude value voltage amplification that FPGA exports by transponder pulse amplifying circuit is to required voltage, and reflected impulse Acquisition Circuit converts the pulse meeting the input of FPGA pin to by two high-speed comparator failure judgement types and by pulse signal.

User interactive module is made up of keyboard and LCD display, and keyboard is connected to the setting of FPGA control survey parameter, and measurement result is outputted in LCD display by FPGA.

Accompanying drawing explanation

Fig. 1 is functional-block diagram of the present utility model;

Fig. 2 is reflected impulse Acquisition Circuit schematic diagram of the present utility model.

Embodiment

For making the purpose of this utility model, technical scheme and advantage clearly, below in conjunction with accompanying drawing, implementation method of the present utility model is described in further detail.

Fig. 1 gives the functional-block diagram of small-sized Aviation cable fault detect orientator.

Small-sized Aviation cable fault detect orientator mainly comprises on-site programmable gate array FPGA, pulse processing circuit and user interactive module.FPGA is used for realizing other exomonental generation of nanosecond, the measurement in the time interval, the buffer memory of measurement data as core processor; Pulse processing circuit comprises transponder pulse amplifying circuit and reflected impulse Acquisition Circuit; User interactive module is made up of keyboard and LCD display.

First by family interactive module input through keyboard detected parameters and send sense command and be input in FPGA, FPGA produces nanosecond pulse as detection pulse, output in tested Aviation cable as detecting pulse after transponder pulse amplifying circuit through being connected with FPGA amplifies, the reflected impulse Acquisition Circuit collection reflected impulse be detected in Aviation cable is input in FPGA and measurement data buffer memory is waited for FPGA process, and result is outputted to LCD display by final FPGA.

Fig. 2 gives the reflected impulse Acquisition Circuit schematic diagram of small-sized Aviation cable fault detect orientator

Reflected impulse Acquisition Circuit converts the pulse meeting the input of FPGA pin to by two high-speed comparator failure judgement types and by pulse signal.Tested Aviation cable output pin VoA with VoB that be connected with the input pin Vi of reflected impulse Acquisition Circuit is connected with FPGA respectively, when there is open circuit fault in Aviation cable, the reflected impulse that the input pin Vi of reflected impulse Acquisition Circuit collects is positive pulse, and comparer A and comparer B all has the pin that pulse exports FPGA to; When short trouble appears in Aviation cable, when the reflected impulse that the input pin Vi of reflected impulse Acquisition Circuit collects is negative pulse, then only have comparer B to have pin that pulse exports FPGA to, comparer A does not then have pulse to export.Therefore FPGA can judge the type of trouble spot on tested Aviation cable according to the output of comparer A and comparer B, selects the output levels standards of suitable comparer to solve the problem of level standard conversion according to the level standard that can input FPGA pin.

Claims

1. a small-sized Aviation cable fault detect orientator, it is characterized in that: utilize time domain reflectometry failure judgement type and convert Distance positioning to time interval measurement by FPGA, Aviation cable fault detection system mainly comprises on-site programmable gate array FPGA, pulse processing circuit and user interactive module, wherein, described FPGA produces transponder pulse to be undertaken amplifying rear output by transponder pulse amplifying circuit, reflected impulse is by carrying out localization of fault and type judgement in reflected impulse Acquisition Circuit Gather and input to FPGA, user interactive module is used for inputting and detects instruction and output detections result.

2. small-sized Aviation cable fault detect orientator according to claim 1, it is characterized in that: described on-site programmable gate array FPGA produces other transponder pulse of nanosecond and receives the reflected impulse that reflected impulse Acquisition Circuit collects, then the ranging pulse time interval is converted to positional information and carries out buffer memory, finally output to display screen display result.

3. small-sized Aviation cable fault detect orientator according to claim 1, it is characterized in that: described pulse processing circuit is made up of transponder pulse amplifying circuit and reflected impulse Acquisition Circuit, the low amplitude value voltage amplification that FPGA exports by transponder pulse amplifying circuit is to required voltage, and reflected impulse Acquisition Circuit converts the pulse meeting the input of FPGA pin to by two high-speed comparator failure judgement types and by pulse signal.

4. small-sized Aviation cable fault detect orientator according to claim 1, it is characterized in that: described user interactive module is made up of keyboard and LCD display, keyboard is connected to the setting of FPGA control survey parameter, and measurement result is outputted in LCD display by FPGA.