CN105588683A - Design method for pressure increasing and decreasing speed measurement apparatus - Google Patents

Abstract

The invention discloses a design method for a pressure increasing and decreasing speed measurement apparatus. The work principle is as follows: a pressure sensor is taken as a detection end for detecting pressure to be measured, converting a physical amount into electric signals and providing signals for subsequent digital measurement; if the work principles and the models of sensors are different, the types and the scope of the output electric signals are also different; the electric signals of the pressure sensor are converted to a signal type and a scope which can be processed in a subsequent circuit through a signals conditioning circuit; the signals are sampled and converted through an analog/digital converter, and an analog quantity is converted into a digital quantity which can be recognized by a microprocessor; and the microprocessor, after obtaining the digital quantity, carries out resolving to obtain a pressure value and a pressure increasing and decreasing speed value, displays a result on a display screen, sends measurement results to a host computer for data communication, and modifies parameters so as to realize online adjustment of display sensitivity.

Description

A kind of method for designing of gaging pressure rising or falling speed device

Technical field

The invention belongs to commercial measurement technical field, relate to a kind of design side of gaging pressure rising or falling speed deviceMethod.

Background technology

Climb meter can reaction pressure rising or falling speed size and Orientation. Discrete climb meter formerReason: meter case sealing, in table, there is an opening bellows, bellows inner chamber is by a thick pressure tube and static pressure phaseLogical, and the outside of bellows (being instrument inner chamber) is also connected with static air pressure by a capillary. Ought fly like thisWhen machine rises or declines, bellows internal pressure changes along with the variation of height substantially, and bellows outside till that timeAir pressure in watchcase, because being subject to retardation capillaceous, changes slowly, produces pressure differential. Height change Shaoxing opera is strong,The pressure differential that bellows bears is larger, drives the corner of pointer also large through transmission mechanism. The expansion of bellows or receiptsContracting is decided by that the rising of aircraft still declines. When rising, because high air pressure reduces, bellows chamber pressure lower thanOutside, bellows will shrink, and drive pointer to be upwards offset respective angles instruction climbing speed, when flying through transmission mechanismWhen machine glides or dives, situation is just in time contrary. And when aircraft is flat while flying, pointer is flat to be referred to, speed is zero. WorkPrinciple as shown in Figure 1.

The measurement of current pressure rising or falling speed is used mechanical capsule pressure gauge, can realize pressure lifting speedMeasurement. But this pressure lifting speedometer volume is large, weight is large, installation site is fixed, dynamically changeIf reading is difficult to Obtaining Accurate pressure limit and can causes irreversible damage in change.

Summary of the invention

The object of the invention is to: the present invention realizes the measuring method of digitized pressure lifting speed, by pressingPower sensor changes pressure analog electrical signal into, sends into microprocessor realize analog signal after sample conversionTo the conversion of data signal, obtain force value and pressure lifting speed through after the resolving of data algorithm in microprocessorDegree value, completes demonstration, the informationization fusion of measurement result and the function of sensitivity on-line control of measured value.

Technical scheme of the present invention is: a kind of method for designing of gaging pressure rising or falling speed device, its operation principleFor: pressure sensor, as test side, detects physical quantity is converted to analog electrical signal testing pressure,For follow-up digitized measurement provides signal; The operation principle of sensor and model difference, the signal of telecommunication class of outputType and scope are also different; The signal of telecommunication of pressure sensor output is converted to subsequent conditioning circuit by signal conditioning circuitIn manageable signal type and scope; By analog/digital converter, this signal is sampled and is changed,Analog quantity is converted into the digital quantity that microprocessor can be identified; Microprocessor obtains after digital quantity, resolvesObtain force value and pressure lifting velocity amplitude, result is presented on display screen, measurement result is sent toPosition machine is realized data communication, and amendment parameter realizes display sensitivity on-line control; Specific design step is as follows:

The first step, according to user demand select hardware, comprise sensor, microprocessor, display, communication mouldChip block and other chip;

Second step, according to operation principle protracting circuit schematic diagram, comprise sensor detect and signal conditioning circuit figure,Microprocessor processor minimum circuit figure, communication module principle and electric power system schematic diagram and display circuit;

The 3rd step, drafting printed circuit diagram, whole according to the size and location customization of the assembly such as circuit board, liquid crystal displayThe size of individual pressure lifting speedometer, shape;

The integrity of the 4th step, welding circuit testing circuit;

The 5th step, according to user demand, design software program is also tested;

The 6th step, software and hardware uniting and adjustment, complete the blank design of pressure lifting speedometer;

The 7th step, according to user demand, displaying time and refreshing frequency are debugged; To the initial value of sensitivityTest with step-length;

The 8th step, software program and function are finally determined after, solidification software, function and parameter.

The invention has the beneficial effects as follows:

The present invention selects the mode of pressure sensor and microprocessor to replace traditional bellows pressure measuring machine tool formula transmissionMode, has alleviated volume and weight; Adopt the mode of transfer of data, replace the friction damage that mechanical structure reducesConsumption, has improved precision; The raising of the precision of pressure sensor and the use of data algorithm also can improve system essenceDegree; Be equipped with adjustment of sensitivity button, sensitivity carried out to on-line control the method is had more in actual useAdvantage; The digitlization storage of pressure lifting velocity amplitude and force value can be provided and make with the communication function of host computerWith, for machine computer identification and use provide feasible basis; Digital display mode is more easily read resultGet, easy to use.

Brief description of the drawings

Fig. 1 is fundamental diagram of the prior art.

Fig. 2 is fundamental diagram of the present invention.

Fig. 3 is the hardware elementary diagram of apparatus of the present invention.

Fig. 4 is microprocessor control and algorithm flow schematic diagram in the present invention.

Detailed description of the invention

Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described further.

The general principle of this method for designing is: pressure sensor is as test side, and testing pressure is detected willPhysical quantity is converted to analog electrical signal, for follow-up digitized measurement provides signal; The operation principle of sensor andModel difference, the electrical signal types of output and scope are also different. The signal of telecommunication of pressure sensor output is passed through to letterNumber modulate circuit is converted to manageable signal type and scope in subsequent conditioning circuit. Pass through analog/digital conversionDevice is sampled and changes this signal, and analog quantity is converted into the digital quantity that microprocessor can be identified. Micro-placeReason device obtains after digital quantity, resolves and obtains force value and pressure lifting velocity amplitude, and result is presented to demonstrationOn screen, measurement result is sent to host computer and realizes data communication, it is online that amendment parameter realizes display sensitivityRegulate. Operation principle of the present invention as shown in Figure 2. The hardware annexation of apparatus of the present invention is as shown in Figure 3:Microprocessor control and algorithm are realized by flow process, as shown in Figure 4. Wherein,

1) sensor

Sensor is realized signal testing function. Compared with the mode of machine driving bellows pressure measurement, pressure passesThat sensor has is highly sensitive, subsequent conditioning circuit is simple, integrated degree is high, synthesis precision is higher, without passingDynamic component, stable performance, reliability is high, volume is little, quality is light, and the advantage such as easy to use.

2) signal conditioning circuit

The analog electrical signal that sensor is detected is nursed one's health, and carries out rectification, filtering, amplifies, fallsThe processing such as make an uproar, carries out amplitude limit to signal and prevents from burning out passage.

3) A/D converter

Analog signal is converted to the data signal that microprocessor can identifying processing.

4) microprocessor

The main control part of whole system, realizes the control of whole system, and data are calculated, transfer of data,The functions such as demonstration. According to actual service condition, as the complexity of the complexity of communication, demonstration,Whether system power dissipations etc. determine design operation system.

5) communication module

Can select serial or parallel communication module, realize measurement result from this device is sent toPosition machine.

6) show

Can use analog digital mode that the pressure of microprocessor and pressure lifting velocity amplitude are shown,To help user of service directly to obtain result of calculation.

7) button

Revise the time of gaging pressure variable quantity by button, online modification sensitivity.

8) output interface

Serial line interface or parallel interface.

9) electric power system

The mode that uses direct current supply or Alternating Current Power Supply provides energy for system works.

Sensitivity arranges functional description: pressure is analog quantity, characterizes the rate of change of pressure by the mode of differential.But processor can only processing digital signal. Discrete signal amount cannot be calculated by the mode of differential, therefore needRepresent the pace of change of pressure by the form of incremental raio.

P (t)=P (t)-p (t-1)/nT, wherein T is A/D conversion interval, and n is integer, and P (t) represents that pressure changes speedDegree. Therefore can realize by changing n value the sensitivity of system. N value is less, and the pressure of demonstration changes more smartCarefully, can embody the details that pressure changes; N value is larger, and the pressure of demonstration changes more rough, embodies pressure and becomesThe main trend of changing. N value is too small, may show not obviously even not change; N value is larger, may ignore changeChange and mislead.

Therefore the function that, can revise indicating value sensitivity can help user's real-time amendment in the time using this device to showBe worth change of sensitivity amount, obtain the fine degree of actual needs.

Specific design step is as follows:

The first step, according to user demand select hardware, comprise sensor, microprocessor, display, communication mouldChip block and other chip;

Second step, according to operation principle protracting circuit schematic diagram, comprise sensor detect and signal conditioning circuit figure,Microprocessor processor minimum circuit figure, communication module principle and electric power system schematic diagram and display circuit;

The 3rd step, drafting printed circuit diagram, whole according to the size and location customization of the assembly such as circuit board, liquid crystal displayThe size of individual pressure lifting speedometer, shape;

The integrity of the 4th step, welding circuit testing circuit;

The 5th step, according to user demand, design software program is also tested;

The 6th step, software and hardware uniting and adjustment, complete the blank design of pressure lifting speedometer;

The 7th step, according to user demand, displaying time and refreshing frequency are debugged; To the initial value of sensitivityTest with step-length;

The 8th step, software program and function are finally determined after, solidification software, function and parameter.

Claims (1)

1. a method for designing for gaging pressure rising or falling speed device, its operation principle is: pressure sensor is doneFor test side, testing pressure is detected physical quantity is converted to analog electrical signal, be follow-up digitized measurementSignal is provided; The operation principle of sensor and model difference, the electrical signal types of output and scope are also different;The signal of telecommunication of pressure sensor output is converted to manageable letter in subsequent conditioning circuit by signal conditioning circuitNumber type and scope; By analog/digital converter, this signal is sampled and changed, analog quantity is transformedThe digital quantity that can identify for microprocessor; Microprocessor obtains after digital quantity, resolve obtain force value andPressure lifting velocity amplitude, is presented at result on display screen, measurement result is sent to host computer and realizes dataCommunication, amendment parameter realizes display sensitivity on-line control; Specific design step is as follows:

The first step, according to user demand select hardware, comprise sensor, microprocessor, display, communication mouldChip block and other chip;

Second step, according to operation principle protracting circuit schematic diagram, comprise sensor detect and signal conditioning circuit figure,Microprocessor processor minimum circuit figure, communication module principle and electric power system schematic diagram and display circuit;

The 3rd step, drafting printed circuit diagram, whole according to the size and location customization of the assembly such as circuit board, liquid crystal displayThe size of individual pressure lifting speedometer, shape;

The integrity of the 4th step, welding circuit testing circuit;

The 5th step, according to user demand, design software program is also tested;

The 6th step, software and hardware uniting and adjustment, complete the blank design of pressure lifting speedometer;

The 7th step, according to user demand, displaying time and refreshing frequency are debugged; To the initial value of sensitivityTest with step-length;

The 8th step, software program and function are finally determined after, solidification software, function and parameter.