CN2242439Y

CN2242439Y - infrared remote measuring strain gauge

Info

Publication number: CN2242439Y
Application number: CN 95221633
Authority: CN
Inventors: 白象忠
Original assignee: SOUTH BRANCH OF DONGBEI HEAVY MACHINERY COLLEGE
Current assignee: SOUTH BRANCH OF DONGBEI HEAVY MACHINERY COLLEGE
Priority date: 1995-09-15
Filing date: 1995-09-15
Publication date: 1996-12-11
Anticipated expiration: 2005-09-15

Abstract

The utility model relates to an infrared remote measuring strain gauge which belongs to the technical field of measure. The infrared remote measuring strain gauge is mainly composed of a measuring device and an operating and recording device. The infrared remote measuring straingauge is characterized in that the measuring device with independent power supply is arranged on a measured member; the operating and recording device can be arranged within a certain distance; signals are transmitted between the measuring device and the operating and recording device through infrared waves. The infrared remote measuring strain gauge has the advantages of high measure precision and strong anti-interference ability. The utility model not only can measure stress and strain under a quiescent state, but also can measure a movable member with rotary speed as high as 20000-30000 per minute.

Description

The infrared telemetry strainmeter

The utility model belongs to technical field of measurement and test.

Malicious event often takes place owing to produce huge inertial force at work in the high speed rotating member, so the accurate mensuration of its ess-strain is one of problem that presses at present solution.In the prior art collector ring pattern and radio telemetry method are adopted in the stress measurement of rotating member usually, mainly there are the following problems for these method of testings: one, the problem of transmission of picked up signal.These measuring methods adopt the way of sliding contact node or telemetering gear emission and received signal to realize usually.But, often because the noise of the flutter receiving node of tested member all is inevitable signal interference sources; The stability that transmits and receives system works of telemetering gear, the interference of extraneous radio magnetic wave all can make the measured signal distortion and produces bigger measuring error.Two, when the radio telemetry system of setting up the hyperchannel resistance-strain, the problem of the distribution of sensor, rectification and commutation then is a very important problem of another one.The common system that commutates (seeing accompanying drawing 2) that is adopted, this system is strict with the system of commutating should have very little convert resistance (＜10 ^-3Ω), only have high-quality mechanical commutation switch, could satisfy such requirement.More can be restricted for telemetry system, this is because under the condition with centrifugal force and vibration, can reduce their reliability hurriedly.If adopt electronics electricity strong (several ohm or tens ohm), then need heavy more switched system (see figure 3) with big convert resistance.Increase if measure passage, will increase the setup time of experimental work amount and test exponentially.Three, be under the complicated condition of work when measured member, when for example standing huge centrifugal intertia force effect and cause flutter, member all can cause the instability of measuring system work under the influence in the temperature field that changes.In a word, low, the poor anti jamming capability of these method of testing measuring accuracies can only be used for the stress determination of stationary state or slow-speed of revolution member.

The purpose of this utility model is to design a kind of infrared telemetry strainmeter of using invisible light transmission detection signal, this Instrument measuring precision height, antijamming capability are strong, not only can measure the ess-strain under the stationary state, and can measure the per minute rotating speed up to 2～30,000 moving members that change.

This infrared telemetry strainmeter (see figure 1) comprises that measurement mechanism and manipulation and pen recorder two parts form, its main points are: measurement mechanism (sees that Fig. 1 infrared receiver 5 a) is connected with amplifier 6, the exit of amplifier 6 is connected with timer 8 with channel switch 7, channel switch 7 is connected with the electric bridge group 1 that timer 8 and amplifier 2, voltage controlled oscillator 3, infrared transmitting device 4 are formed signal emission part, and channel switch 7 also links to each other with voltage controlled oscillator 3; Handle and be connected with single-chip microcomputer 17 with amplifier 9 with the infrared transmitting device 10 of pen recorder (seeing Fig. 1 b), line outside line receiving trap 11 is connected with voltage table 12, pulse producer 19 through amplifier 20, pulse producer 19 is connected with amplifier 9, F/V converter 13, master cock 18 again, master cock 18 is connected with single-chip microcomputer 17, oscillograph 14 is installed on the delivery outlet of F/V converter 13, and single-chip microcomputer 17 is connected with amplifier 9.

Drawings and Examples:

Fig. 1 is the block diagram of measuring device part (a) and the manipulation and the pen recorder part (b) of infrared telemetry strainmeter.

The commutate system circuit diagram of Fig. 2 for adopting usually.

Fig. 3 is the switched system circuit diagram with big convert resistance.

Fig. 4 circuit diagram of the present utility model.

Accompanying drawing 1 is disclosed to be an exemplary embodiments of the utility model infrared telemetry strainmeter, and measurement mechanism can be arranged separately on the test specimen, is installed in certain distance and handle with pen recorder, transmits signal by infrared waves between the two.

Measuring device part is that work (is seen Fig. 1 a) like this; By after handling the signal that sends with pen recorder and being received by infrared receiver tube 5, pass to infrared ray amplifier 6 and amplify, make it in exit of amplifier 6 output, its value is definite by the electric impulse signal of handling and pen recorder sends.These signal part admission passage switching selectors 7 make it place corresponding state.Channel switch selector switch 7 starts the corresponding half-bridge of electric bridge groups 1, and amplifier 2 has amplified the signal that the half-bridge that enters the measurement state provides, and is converted to pulse signal through voltage controlled oscillator 3, is sent by infrared emission tube 4 at last.Like this, infrared emission tube 4 has sent the variable signal that is produced by the work electric bridge group 1 that is switched on, receive for handling with pen recorder, another part signal that amplifier 6 is exported enters timer 8, through the regular hour, timer 8 passes to signal channel switch selector switch 7 again, makes it return to original zero condition after finishing a measurement circulation.At this moment, cut off the power supply of voltage controlled oscillator 3 and the power supply of electric bridge group 1, to reduce the energy consumption of entire measuring device, whole process approximately needed for 1 second.

Manipulation is work (seeing Fig. 1 b) like this with pen recorder; When connecing firing button on the lower keyboard 15, when selecting service aisle, form pulsed beams at the one-chip computer delivery outlet, its value is decided by the trigger port number on the keyboard.These pulses enter amplifier 9 and then enter infrared emission tube 10, behind the infrared receiver tube 5 of the measured device of signal that emits, have started above-mentioned measuring system, make it enter duty.At this moment, infrared receiver tube 11 begins to receive the signal pulse that is passed over by measurement mechanism, and these signals are amplified into voltage table 12 and pulse producer 19 through amplifier 20.Wherein voltage table 3 can be monitored the value of the signal that is received, and utilizes its can mitigation system initial tuning workload, i.e. relative position between measurement mechanism and manipulation and pen recorder.The pulse of sending from arteries and veins portion generator 19 enters three assemblies:

(1) enters the repeat its transmission of amplifier 9 usefulness, directly start the back and finish by the end of measurement mechanism timer 8 by this device.

(2) enter frequency transformer 13, so that arrive oscillograph or the kinetic analyzer that is connected on voltage to frequency change device 13 delivery outlets, so that observe the ripple of measured signal

(3) enter master cock 18 and begin to launch from one-chip computer 18 delivery outlets in 0.5 second of working signal moment, it is 200 milliseconds pulse that one-chip computer 17 delivery outlets are launched perdurability again simultaneously.After master cock 18 has been opened in this pulse, allow pulse the arteries and veins portion that takes place of living device 19 by and enter to do and form is the one-chip computer 17 of working system.So far, measure first stage end of round-robin.

Measure round-robin second stage and be from opening again the moment of measurement mechanism, at this moment closing master cock 18, the one-chip computer delivery outlet is repeat its transmission again, but what at this moment send is the standard electric bridge that is used for starting in the measurement mechanism electric bridge group 1.

When sending pulse signal again and enter measurement mechanism, job step above then measurement mechanism repeats will be in measurement mechanism electric bridge group 1, and the working signal that is made of electric bridge measuring resistance is launched.Whole measurement round-robin is the phase not, and the numeral that is write down on the one-chip computer 17 will be control signal reading poor of the measuring-signal of phase one and subordinate phase, and result of calculation is offered display 16, perhaps stores, and is perhaps printed by printer 21.

Utilize this measuring instrument of infrared bidirectional Principle of Communication design, have heavily Amount is light, and volume is little, and the advantage that can avoid various types of signal to disturb is easy and simple to handle, no Zeroing, do not have zero waft, uncompensation, can the Accurate Measurement rotating speed up to 30,000 rev/mins of models Stress, strain numerical value that member within enclosing is dynamic and static. Measuring resolution 1 μ ε, The measuring accuracy height can be realized test record, data analysis automation. Can be at large Be applied on the mensuration of moving link, particularly be applied to the High Rotation Speed member the worker Do on the mensuration of state, for example turbine rotor, helicopter wing, tail spiral The stress-strain analysis of the members such as oar, aircraft engine rotor, blade fragment are attacked etc. and to be asked The mensuration of topic can utilize this instrument to carry out.

Claims

1, a kind of infrared telemetry strainmeter, comprise that measurement mechanism and operation, pen recorder form, it is characterized in that: the infrared receiver 5 of measurement mechanism is connected with amplifier 6, the exit of amplifier 6 is connecting channel switch 7 and timer 8, channel switch 7 is connected with the electric bridge group 1 of the signal emission part that timer 8, amplifier 2, voltage controlled oscillator 3, infrared transmitting device 4 are formed, and channel switch 7 also is connected with voltage controlled oscillator 3; The single-chip microcomputer 17 of operation, pen recorder is connected with infrared transmitting device 16 through amplifier 9, infrared receiver 11 is connected with voltage table 12, pulse producer 19 through amplifier 20, pulse producer 19 is connected with amplifier 9, F/V converter 13, master cock 18 again, master cock 18 is connected with single-chip microcomputer 17, oscillograph 14 is installed on the delivery outlet of F/V converter 13, and single-chip microcomputer 17 is connected with amplifier 9.