1、第 1 页 外文 翻译（原文） Distributed Temperature Sensor 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 m
2、aster 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 th
3、e development of the temperature sensor. 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 i
4、nstruments 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 underta
5、ke 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 tempe
6、rature 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 se
7、nsor 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 technolog
8、y, 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)
9、, random access memory (RAM) and read only memory (ROM). Intelligent temperature sensor is characteristic of 第 2 页 temperature data and relevant can output the temperature control of the quantity, adaptation various micro controller (MCU)； The development trend of the temperature sensor. In the 21st
10、 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 applicatio
11、n 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, hig
12、h 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, ca
13、n 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 c
14、ontrol, 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 proces
15、sing 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 tem
16、perature, accurate to 0.1 degrees. 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 programmabl
17、e 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
18、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 第 3 页 1-2 AT89C51 pins figure Ma
19、jor features: and MCS - 51 compatible 4K bytes programmable FLASH memory life: 1000 write/wipe cycle data retention time: 10 years the static job: 0Hz - 24MHz level 3 program memory lock 128 x 8 bits internal RAM 32 programmable I/O lines two 16 timer 5 interrupt source programmable serial channels
20、low power consumption of idle and power lost mode 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.
