CN101706302A

CN101706302A - Cavity resonance method measuring instrument

Info

Publication number: CN101706302A
Application number: CN200910192793A
Authority: CN
Inventors: 张仲生
Original assignee: Individual
Current assignee: Individual
Priority date: 2009-09-24
Filing date: 2009-09-24
Publication date: 2010-05-12

Abstract

A cavity resonance method measuring instrument consists of an instrument body, a door, a cavity, a pipeline, a loudspeaker, a display screen, an electret capacitor microphone MIC, press keys, and an electronic circuit board box, the cavity is composed of the instrument body and the door, the object to the tested is put in the cavity to reduce the volume of the cavity, the resonance frequency of the cavity correspondingly increases with the cooperation of the electronic circuit to measure the volume of the irregular object. The invention can measure the volume of a solid and liquid with any specific gravity; auxiliary measurement material is not needed, air is used as medium, thus being clean; the invention can be used for measuring object with small gaps, small pores, small hollows without influencing the result value thereof; the operation is simple, and the invention can be made into miniature type to be portable, thus being easy to popularize and use.

Description

Cavity resonance method measuring instrument

Technical field

The invention belongs to a kind of cavity resonance method measuring instrument.

Background technology

Equipment and the method for measuring the irregularly shaped object volume have various, for example: hydrostatics method measuring instrument is that the container that will dedicated water be housed is placed in the middle of the electronic platform scale, weigh up the aerial weight G of testee earlier, this object is immersed in records its weight G in the water again ₁, by the proportion Y of the built-in counting circuit of measuring instrument to water _WaterCarry out temperature coefficient and proofread and correct, and calculate the volume V=G-G of testee ₁/ Y _Water, demonstrate proportion, weight, the volume of measured object by Y=G/V.Hydrostatics method measuring instrument has following deficiency: one, can only measure the small-sized solid of proportion greater than water; Two, need dedicated water, increased measurement expense and polluted testee again easily; Three, measurement has the object deviate in little gap, aperture, little cavity big; Four, operation is more miscellaneous, and difficulty is made small portable, how to use in specialized department, can not popularize use.

Summary of the invention

The purpose of this invention is to provide a kind of cavity resonance method measuring instrument, utilize the principle of cavity resonance to overcome above-mentioned shortcoming, measure the irregularly shaped object volume.

The present invention is by body, door, pipeline, cavity, loudspeaker Y, display screen LED, electret condenser microphone MIC, button K ₁, K ₂, the electronic circuit board case forms, in body, be provided with the cavity of dress object being measured, cavity links with the door that has compacting device, on the wall of body, be provided with 8 pipelines, pipeline communicates with cavity, and wall is provided with loudspeaker Y and electret condenser microphone MIC in the upper end, and loudspeaker Y and electret condenser microphone MIC are connected with the built-in electronic circuit, be provided with display screen LED in the front of body, be provided with " zero setting " K below the display screen LED ₂" measurement " K ₁Button is provided with dress electronic circuit board case at organism bottom.

Advantage of the present invention:

One, can measure the solid and the liquid of any proportion;

Two, do not need the subsidiary material, usefulness be that air is done medium, cleaning is clean;

Three, measure the object that little gap, aperture, little cavity are arranged, do not influence its end value;

Four, simple to operate, can make small portable, be easy to popularize and use.

Description of drawings

Fig. 1 is a structural representation of the present invention;

Fig. 2 is a structure cut-open view of the present invention;

Fig. 3 is a circuit diagram of the present invention.

Embodiment

As shown in Figure 1, 2, irregularly shaped object is put into cavity 4, close and call 2, utilize compacting device 5 to compress door 2, cavity 4 links with the door 2 that has compacting device 5, on the wall of body 1, be provided with 8 pipelines 7, pipeline 7 communicates with cavity 4, and wall is provided with loudspeaker Y and electret condenser microphone MIC in the upper end, and loudspeaker Y is connected with the built-in electronic circuit, be provided with display screen LED3 in the front of body 1, be provided with " zero setting " K below the display screen LED3 ₂" measurement " K ₁Button is provided with dress electronic circuit board case 6. and presses the K switch energized in body 1 bottom, just can measure.

As shown in Figure 3, described circuit is that K switch one end is connected with power supply, and the other end is connected phase inverter CD4069-1 output terminal and resistance R with 6 pin of miniwatt operational amplifier LM386 ₁, capacitor C ₁Decoupling circuit connects back and pull-up resistor R ₂, electret condenser microphone MIC connects, again with capacitor C ₂, resistance R ₄, capacitor C ₃The bandpass filter of forming, positive input terminal 3 pin of miniwatt operational amplifier LM386 connect, and the output terminal of miniwatt operational amplifier LM386 is through capacitor C ₆With resistance R ₆And resistance R ₉, diode D ₁, D ₂Back in parallel is connected as the negative feedback branch road with negative input end 2 pin, another road and the capacitor C of miniwatt operational amplifier LM386 output ₆, loudspeaker Y connects, and gives electret condenser microphone MIC by the Air Coupling of cavity (4), this has just formed the wien oscillator circuit; Capacitor C ₆Be connected resistance R with capacitor C 7 ₈With phase inverter CD4069-2 and connect, be connected the Q of 12 binary string linage-counter/frequency divider CD4040 with 12 binary string linage-counter/frequency divider CD4040 again ₉End is connected with the B pin of Schmidt trigger CD4093-2, so just can obtain 1/f * 2 ⁸Pulse width signal is controlled by R ₁₂, the 2MHz crystal oscillator and meet Schmidt trigger CD4093-1 after connect " the opening " or " pass " in quantized signal source of the A end of CD 4093-2; The other end of power switch K with can preset several binary-decimals and add/down counter MC14510B-1,2,3 D ₁, D ₂, D ₃, D ₄Pin links to each other to fetch and changes N value so that calibration testee value, and MC14510B-1,2,3 PE pin connect the output terminal of CD4069-5, the QCO connection diode D of MC14510B-2 ₈, the QCO of MC14510B-3 connects diode D ₉, CD4093-3,4 A end, the output terminal of CD4093-2 connects the CP end of MC14510B-1, MC14510B-1,2,3 is together in series, and so just can obtain 1/f * 2 ⁸The quantized signal of * 2MHz/N is through CPV or the CPD end of the output terminal connection count of CD4093-3 or CD4093-4/latch/7 sections decoding/driver CD40110BE-1, after CD40110BE-1,2,3,4 computings, demonstrate the result, the Q of CD 4040 with display screen LED-1,2,3,4 corresponding connections again by a, b, c, d, e, f, g end ₁₀Hold one tunnel " opening " or " pass " that is connected control electret condenser microphone MIC with the CD4069-1 input end; One the tunnel is connected with MC14510B-1,2,3 clear terminal Cr, the one tunnel with " measurement " K ₁, " zero setting " K ₂Common port connect, the one tunnel holds with the CP of CD4013-1 and to be connected the Q of CD4013-1 ₁End is connected Q with the B end of CD4093-4 ₁End is connected with the CP end of CD4013-2, the B end of CD4093-3, so just can guarantee at Q ₁₀Under the control of end, CD4093-3 and CD4093-4 " open " or " pass " each other, the Q of CD4013-2 ₂Terminating diode D ₆Positive pole, negative pole connects D ₇Negative pole, R ₁₀, CD4069-4 input end, output terminal connection count/latch/7 section decoding/driver CD40110BE-1,2,3,4 LE end goes data latching or output to show Q ₂End connects the input end of CD4069-3, and output terminal is connecting " point " stroke dp of display screen LED-2.

Open door 2, place testee in the cavity 4 after, close door 2, by " measurement " key, the starting of oscillation of wien oscillator circuit, frequency is f ₂, not just not repeated during of the process under connecing with top " zero setting ", different is: one, press " measurements " key only to CD4040 " zero setting ".Two, quantized signal is added to CD40110BE-1,2,3,4 CPD end and carries out subtraction with latched data behind CD4093-4, and the result is: the volume of testee=(1/f ₁-1/f ₂) * 2 ⁸* 2MHz/242.Three, CD4013-1 resets and makes the CD4013-2 upset be Q ₂=1, pass through D ₆Be added to the CD4069-4 input end, be output as " 0 " give CD40110BE-1,2,3,4 LE end, latched data be defeated by display screen LED-1,2,3,4 demonstrate measurement result value, form be " * * *. * " cubic centimetre.Four, the Q of CD4013-2 ₂=0, " dp " (point) stroke of pilot lamp LED-2 is lighted in CD4069-3 output " 1 ".

In brief, when " zero setting " key, circuit is with a 1/f ₁* 2 ⁸ Pulse width signal 1/f when going to control the 2MHz/N quantized signal and deducting by " measurement " key ₂* 2 ⁸Pulse width signal go to control the 2MHz/N quantized signal.Adjust the N value, make it just equal testee volume number, form be " * * *. * " cubic centimetre.

Operating process is: close door 2, if test liquid, earlier a small container is positioned in the cavity 4, close door 2 again, by " zero setting " key, display screen shows " 0000 ". open door 2, testee is placed in the cavity 4, if liquid promptly is contained in the small container, by behind " measurement " key, display screen demonstrate measurement result " * * *. * " cubic centimetre. with a miniature electric pound or weigh circuit in when design with amount and do together, just can draw proportion, weight, the volume of testee by Y=G/V.

Cavity of the present invention 4 about 360 cubic centimetres also can be set cavity 4 volumes according to actual needs, can survey within 120 cubic centimetres on the object, and deviate is by object volume V ± 0.1 cubic centimetre.This is as universal enough.Higher if desired exact value can improve the frequency in quantized signal source.Improve the stable rank of wien oscillator circuit, because ambient pressure changed influential to it when the present invention worked, so require to work at the more stable environment of air pressure (leeward environment), when office work, require measuring instrument sound wave to be had the object of reflex more than 50 centimetres from vertical large tracts of land such as walls, and chamber volume is more than 20 cubic metres.

Claims

1. cavity resonance method measuring instrument is by body, door, cavity, pipeline, loudspeaker Y, display screen LED, electret condenser microphone MIC, button K ₁, K ₂, the electronic circuit board case forms, it is characterized in that in body (1), being provided with the cavity (4) of dress object being measured, cavity (4) links with the door (2) that has compacting device (5), on the wall of body (1), be provided with 8 pipelines (7), pipeline (7) communicates with cavity (4), and wall is provided with loudspeaker Y and electret condenser microphone MIC in the upper end, and loudspeaker Y is connected with the built-in electronic circuit, front at body (1) is provided with display screen LED3, is provided with " zero setting " K below the display screen LED 3 ₂" measurement " K ₁Button is provided with dress electronic circuit board case (6) in body (1) bottom.

2. according to the described cavity resonance method measuring instrument of claim 1, it is characterized in that described circuit is that K switch one end is connected with power supply, the other end is connected phase inverter CD4069-1 output terminal and resistance R with 6 pin of miniwatt operational amplifier LM 386 ₁, capacitor C ₁Decoupling circuit connects back and pull-up resistor R ₂, electret condenser microphone MIC connects, again with capacitor C ₂, resistance R ₄, capacitor C ₃The bandpass filter of forming, positive input terminal 3 pin of miniwatt operational amplifier LM386 connect, and the output terminal of miniwatt operational amplifier LM386 is through capacitor C ₆With resistance R ₆And resistance R ₃, diode D ₁, D ₂Back in parallel is connected as the negative feedback branch road another road and the capacitor C of miniwatt operational amplifier LM386 output terminal with negative input end 2 pin ₆, loudspeaker Y connects, and gives electret condenser microphone MIC by the Air Coupling of cavity (4), this has just formed the wien oscillator circuit; Capacitor C ₆With capacitor C ₇Connect resistance R ₈With phase inverter CD4069-2 and connect, be connected the Q of 12 binary string linage-counter/frequency divider CD4040 with 12 binary string linage-counter/frequency divider CD4040 again ₉End is connected with the B pin of Schmidt trigger CD4093-2, so just can obtain 1/f * 2 ⁸Pulse width signal is controlled by R ₁₂, 2MH _ZCrystal oscillator and meet Schmidt trigger CD4093-1 after connect " the opening " or " pass " in quantized signal source of the A end of CD4093-2; The other end of power switch K with can preset several binary-decimals and add/down counter MC14510B-1,2,3 D ₁, D ₂, D ₃, D ₄Pin links to each other to fetch and changes N value so that calibration testee value, and MC14510B-1,2,3 PE pin connect the output terminal of CD4069-5, the QCO end connection diode D of MC14510B-2 ₈, the QCO end of MC14510B-3 connects diode D ₉, CD4093-3,4 A end, the output terminal of CD4093-2 connects the CP end of MC14510B-1, MC14510B-1,2,3 is together in series, and so just can obtain 1/f * 2 ⁸* 2MH ₈The quantized signal of/N is through CPV or the CPD end of the output terminal connection count of CD4093-3 or CD4093-4/latch/7 sections decoding/driver CD40110BE-1, after CD40110BE-1,2,3,4 computings, demonstrate the result, the Q of CD4040 with display screen LED-1,2,3,4 corresponding connections again by a, b, c, d, e, f, g end ₁₀Hold one tunnel " opening " or " pass " that is connected control electret condenser microphone MIC with the CD4069-1 input end; One the tunnel is connected with MC14510B-1,2,3 clear terminal Cr, the one tunnel with " measurement " K ₁, " zero setting " K ₂Common port connect, the one tunnel holds with the CP of CD4013-1 and to be connected the Q of CD4013-1 ₁End is connected Q with the B end of CD4093-4 ₁End is connected with the CP end of CD4013-2, the B end of CD4093-3, so just can guarantee at Q ₁₀Under the control of end, CD4093-3 and CD4093-4 " open " or " pass " each other, the Q of CD4013-2 ₂Terminating diode D ₆Positive pole, negative pole connects D ₇Negative pole, R ₁₀, CD4069-4 input end, output terminal connection count/latch/7 section decoding/driver CD40110BE-1,2,3,4 LE end goes data latching or output to show Q ₂End connects the input end of CD4069-3, and output terminal is connecting " point " stroke dp of display screen LED-2.