陈少俊英文翻译 Microsoft Word 文档.docx
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Distributed Temperature Sensor
1.Sensor introduction 1.1 Temperature sensor background
In the human living environment, temperature playing an extremely important role。
No matter where you live, engaged in any work, ever-present dealt with temperature under. Since the 18th century, industry since the industrial revolution to whether can master send exhibition has the absolute temperature touch. In metallurgy, steel, petrochemical, cement, glass, medicine industry and so on, can say almost eighty percent of industrial departments have to consider the factors with temperature. Temperature for industrial so important, thus promoting the development of the temperature sensor.
1.2 Temperature sensor development
Major general through three sensor development phase:
analog integrated temperature sensor. The sensor is taken with silicon semiconductor integrated workmanship, therefore also called silicon sensor or monolithic integrated temperature sensor. Such sensing instruments have single function （only measuring temperature）, temperature measurement error is smaller, price low, fast response, the transmission distance, small volume, micro-consumption electronic etc, suitable for long distance measurement temperature, temperature control, do not need to undertake nonlinear calibration, peripheral circuit is simple. It is currently the most common application at home and abroad, an integrated sensor。
Typical products have AD590 AD592, TMP17, LM135, etc.jAnalog integrated temperature controller. Analog integrated temperature controller mainly include temperature control switch, programmable temperature controller, a typical product have LM56, AD22105 and MAX6509. Some increase strength type integrated temperature controller （for example TC652/653） also contains the A/D converter and cure good sequence, this process with the intelligent temperature sensor some similarities. But it is not its system, work by micro processing device control, this is the main difference between. Intelligent temperature sensor. intelligent temperature sensor （also called digital temperature degrees sensor） is in the mid 1990s launch. It is microelectronics technology, computer technology and the dynamic testing technology （ATE） crystallization. Intelligent temperature sensor internal contain temperature sensor, A/D converter, signal processor,
memory （or registers） and interface circuit. Some products still take multiplexer, central control system device （CPU）, random access memory （RAM） and read only memory （ROM）. Intelligent temperature sensor is characteristic of temperature data and relevant can output the temperature control of the quantity, adaptation various micro controller （MCU）;
1.3 Single point and more temperature sensor The development trend of the temperature sensor. In the 21st century, the temperature sensor is headed in high precision, multi-function, bus, standardization, high reliability and safety, development of virtual sensor and network sensor, research monolithic temperature measuring system and other high-tech direction develop rapidly. Sensors in the application temperature controlling system. Current market exists mainly single point and more two temperature measurement. For single point temperature foundment instrument, mainly adopts the traditional analog integrated temperature sensor, which heat resistance, thermocouple sensors measuring accuracy, high measurement range, and got the general application. This product is temperature measuring range ℃ ~ 200 mostly between 800 ℃, resolution 12th, and least distinguishable temperature in 0.001 ~ 0.01 between. Cabin LED display module, shows ranging from 4 to
16. Some instruments also has memory function, can store several hundred to a few thousand sets of data. This instrument can be very good meet a single user single-point measurement needs. More temperature measurement, relative and single point measurement precision has certain gap, although realized the multi-channel temperature measurement and control, but the price is expensive. In view of the present market situation, proposed this topic can satisfy requirements, scalable and cost-effective single-chip multi-channel temperature measuring system. Through the first temperature sensor DS18B20 acquisition, and then through the C51 SCM processing and displayed on the digital tube, can be collected indoor or a greenhouse around in different locations of the temperature, with four digital tube to display. The first digital pipe display acquisition is which way, which channel. Three digital pipe display after the acquisition channel by temperature, accurate to 0.1 degrees.
2. The system realized and related technologies
2.1.The system is realized
By the whole control system for core AT89C51, using four ways of temperature sensor DS18B20 in production site for distribution area of four different temperature measurement result with the chip checking, collation store and display, and through the button control, temperature will process after the
ED digital display to come out, and the software assurance system anti-interference capacity。
four DS1820 connected to MCU respectively, this scheme four IO mouth occupy MCU four IO though, but the microcontroller IO mouth under the condition of mouth not shortage by this scheme greatly simplify programming difficulty, shorten the design cycle, also can guarantee the stability of the system. A multipoint connection as shown“1-1”
-1 multipoint connection
2.2 .AT89C51 Chip introduction
AT89C51 is a 4K bytes FLASH Memory （Erasable Programmable and FPEROM - FLASH for the campaigns with） low voltage, high-performance CMOS eight microprocessors, commonly known as the microcontroller. AT89C2051 is a 2K bytes with flash memory can be erased programmable read-only memory , SCM can erase read-only memory can be repeated erased 1000 times. This device adopts ATMEL high-density non-volatile memory manufacturing technology manufacturing, and industrial standard MCS - 51 instruction set and output tube compatible. Due to the multifunctional 8 bits CPU and will be flashing on single chip combination of memory, ATMEL AT89C51 is a kind of high efficient micro controller, AT89C2051 is a streamlined version. AT89C 51microcontroller as many embedded control system .Arrange appearance and pin as shown in figure "1-2" shown
-1 multipoint connection
2.2 .AT89C51 Chip introduction
AT89C51 is a 4K bytes FLASH Memory （Erasable Programmable and FPEROM - FLASH for the campaigns with） low voltage, high-performance CMOS eight microprocessors, commonly known as the microcontroller. AT89C2051 is a 2K bytes with flash memory can be erased programmable read-only memory , SCM can erase read-only memory can be repeated erased 1000 times. This device adopts ATMEL high-density non-volatile memory manufacturing technology manufacturing, and industrial standard MCS - 51 instruction set and output tube compatible. Due to the multifunctional 8 bits CPU and will be flashing on single chip combination of memory, ATMEL AT89C51 is a kind of high efficient micro controller, AT89C2051 is a streamlined version. AT89C 51microcontroller as many embedded control system .Arrange appearance and pin as shown in figure "1-2" shown
1-2 AT89C51 pins figure
Major features:
路 and MCS - 51 compatible
路 4K bytes programmable FLASH memory
路 life:
1000 write/wipe cycle
路 data retention time:
10 years
路 the static job:
0Hz - 24MHz
路 level 3 program memory lock
路 128 x 8 bits internal RAM
路 32 programmable I/O lines
路 two 16 timer
路 5 interrupt source
路 programmable serial channels
路 low power consumption of idle and power lost mode
路 piece inside oscillator and clock circuit
Tube feet explains:
VCC:
power supply voltage.
GND:
grounded.
P0 Mouth:
P0 mouth a eight leak level two-way I/O mouth open, every foot can absorb 8TTL gate current. When the pipe mouth P0 feet first write 1, defined as high resistance input. P0 can be used for
external program data storage, it can be defined as the eighth data/address. In FIASH programming, P0 mouth as the source-code input port, when FIASH check, the source-code P0 output, when P0 external must be pulled.
P1 mouth:
mouth is an internal P1 provide pull-up resistors 8-bit two-way I/O mouth, P1 mouth buffer can receive 4TTL gate current output. P1 mouth tube feet, was then write 1 for high, pull up inside can be used as input, P1 mouth be external pull down for low electricity at ordinary times, will output current, this is due to internal pull up sake. In FLASH programming and calibration, P1 mouth as eighth address to receive.
P2 mouth:
for an internal P2 mouth on the 8-bit pull-up resistors two-way I/O port, P2 mouth to receive, the output buffer 4 TTL gate current, when P2 mouth is written "1", its tube feet are internal pull-up resistors, and push as input. And so as the input, P2 mouth feet are external down tube, will output current. This is due to internal pull up sake. P2 mouth when used external program memory or 16 address external data memory access, P2 mouth high output address eight. In a given address "1", it using internal and external 8 address advantage, when for reading and writing data memory, P2 when the special function registers mouth output of content. P2 mouth in FLASH programming and the calibration eight address when receiving high signal and control signals.
P3 mouth:
P3 mouth pipe is 8 feet with internal pull-up resistors two-way I/O port, may receive four TTL gate current out put. When P3 mouth writing "1", they are internal and high level, and used as input. As input, due to external drop-down for low level, P3 mouth will output current （ILL） this is due to pull up's sake.
RST:
reset input. When oscillator reset device to keep RST feet high level two machine cycle time.
ALE/PROG:
when access external storage, address latch allows the
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