薄膜谐振式液位高度测量用频率计的设计

3.0 闻远设计 2023-08-16 117 4 3.02MB 36 页 30光币
侵权投诉
(AT89C51)使
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±10Hz使便
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Abstract
T h i s p a p e r p r e s e n t s t h e d e s i g n a n d f a b r i c a t i o n o f a M i c r o p r o c e s s o r
( AT 8 9 C 5 1 )b a s e d f i l m r e s o n a n t w i t h t h e w a t e r l e v e l s e n s o r s u p p o r t i n g t h e u s e o f t h e
l i q u i d l e v e l m e a s u r e m e n t f r e q u e n c y m e t e r. T h e p r i n c i p l e o f n e w r e s o n a t o r w a t e r l e v e l
sensor is mainly introduced.The internal structure of this Sensor and the characteristic
of numeral oscillation circuit are analyze dindetails.There ationship between frequently
a n d w a t e r l e v e l i s e x p o u n d e d .F i l m s r e s o n a n t w a t e r l e v e l s e n s o r b u i l t - i n t h r e e - p o i n t
level sensor oscillation circuit.The oscillator circuit changed with the natural frequency
of the wat er l eve l. B y d ete c tin g the o scillat ion cir cuit na tur a l frequen c y t o d e ter min e
the level of water.
The frequencymeter use the Microprocessor internal counter to counting the film
resonant frequency of the water level sensor pulse,then Microprocessor regular function
to achieve frequency testing, final adoption of LED display circuit dynamic numerical
show.Application of the design of the 89C51 operation and control functionsMeet the
required precision measurementThe error of the frequency measurement instrument
i s l e s s t h a n ±1 0 HzP e r f o r m a n c e m e a s u r e m e n t f r e q u e n c y s t a b i l i t y a n d
reliability,Also it can be used alone, and easily embedded in the system.
T h e f r e q u e n c y - m e t e r a l s o h a s a s i m p l e s t r u c t u r e , l o w c o s t , h i g h a c c u r a c y a n d
simple operation,reduce the cost of the product and facilitate the design and
development of new product and so on. With the development of the Microprocessor
t e c h n o l o g y , a g r o w i n g n u m b e r o f m e a s u r i n g i n s t r u m e n t s a r e u s e d a s a s i n g l e c h i p
c o m p u t e r s y s t e m d e s i g n . M i c r o p r o c e s s o r s y s t e m d e s i g n i s s i m p l e , e a s y t o c o n t r o l ,
h a r d w a r e d e s i g n r e q u i r e s f e w e r e x t e r n a l c o m p o n e n t s , S o f t w a r e D e s i g n u s e a s s e m b l y
language programming, because assembly language with high computational efficiency
and low memory consume.
Keywords: Water Level Measurement Frequency Measurement Sensors
Microprocessor
1...............................................................1
1.1选题的及..............................................1
1.2 频率器的展.....................................1
1.3 频率计内.......................................2
2...........................................3
2.1 薄膜水位述.....................................3
2.1.1 薄膜振式器的.............................3
2.1.2水位器的....................................3
2.2薄膜式水能简................................4
2.2.1水位测................................................4
2.2.2水位率关....................................4
3.................................................6
3.1方案与比................................................6
3.1.1 方案一.................................................6
3.1.2 方案二.................................................7
3.2 方案择.....................................................7
4...............................................8
4.1频率统的作原................................8
4.1.1 系统组成..............................................8
4.1.2 系统设计..........................................8
4.1.3 测频原理..............................................9
4.2 AT89C51单片统中................................9
4.2.1 AT89C51简介...........................................9
4.2.2 AT89C51器件基本................................11
4.2.3 AT89C51的定/计数...............................13
4.2.4 AT89C51外围路设..................................14
4.3 地址74LS373介绍.......................................14
4.4 八路冲器74LS240应用...................................15
4.5 显示路....................................................16
4.5.1显示设计...........................................16
4.5.2单片动数...................................17
4.6 硬件图................................................17
5 .........................................................18
5.1主程计...................................................18
I
摘要:

摘要本文介绍了一种以单片机(AT89C51)为核心与薄膜谐振式水位传感器配套使用的液位高度测量用频率计的设计与制作。还介绍了谐振式水位传感器的新型传感原理,传感器的结构,数字振荡电路的特点,阐述了水位与频率的对应关系。薄膜谐振式水位传感器内置三点式水位传感器振荡电路,该振荡电路的固有频率随水位的变化而变化,通过检测该振荡电路的固有频率来判定水位的高低。该频率计直接利用单片机内部的计数器对薄膜谐振式水位传感器的频率脉冲信号进行计数,然后利用单片机的定时功能实现对频率的检测,最后通过LED动态显示电路显示数值。在设计中应用了单片机的运算和控制功能,满足测量的精度要求该频率测量仪器测量误差小于±10...

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作者:闻远设计 分类:非标机械电气自动化 价格:30光币 属性:36 页 大小:3.02MB 格式:DOC 时间:2023-08-16

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