Before answering the purpose and principle, let's talk about the remarkable highlight of HCS-500 high-frequency infrared carbon and sulfur analyzer: 1. The ARM9 processor has been successfully applied to the HCS-500 series high-frequency infrared carbon and sulfur analyzer of Shanghai Guo Ke Instrument Co., Ltd. and the HCS-500 series high-frequency infrared carbon and sulfur analyzer of Guo Ke. In order to realize the high-performance processing ability of the instrument, we no longer use the simple and cheap 805 1 single chip microcomputer with a main frequency of only 22M, and the above 8-bit 805 1 single chip microcomputer is far from meeting the real-time processing speed required by the instrument. The central data processing unit of Guo Ke HCS-500 high-frequency infrared carbon-sulfur analyzer exclusively adopts high-performance industrial-grade ARM9 processor, and the current processing frequency is as high as 200Mhz, and both the memory and flash memory use high-speed chips with 32M storage space. The open source Linux real-time operating system is adopted in the processor software design, and the object-oriented design method is adopted in the control software design, which ensures the optimization and high reliability of the program. FPGA is used as the intermediate driver chip and data buffer on the interface between processor and sampling chip, and FPGA is used for external control valve to realize parallel processing buffer drive and fast isolated optocoupler control of corresponding ports. Because we use high-speed CPU and FPGA as hardware processing chips, the sampling times of this instrument are increased to more than 654.38+ million times per second, while the sampling times of other existing instruments using 8-bit 805 1 series single chip microcomputer are generally 8000/ 16000 times. High-speed CPU will analyze the collected data in real time, make the data gradually approximate and calculate the probability statistics, and then store the effective data in 32M large-capacity SDRAM. 2. Multivariate nonlinear fitting technology has been successfully applied to the linearization and calibration software of HCS-500 series high-frequency infrared carbon-sulfur analyzer of Shanghai Guo Ke Instrument Co., Ltd. In order to achieve high linearity in the detection range, a full range of multidimensional nonlinear fitting method is adopted. The infrared carbon and sulfur analyzer analyzes the carbon and sulfur content in the substance by detecting the absorption of infrared radiation by CO2 and SO2 gas. Linearization calibration is the key technology of instrument data. Because Bill-Lambert law conforms to the exponential law, and the infrared filter has a certain bandwidth, and the gas absorption coefficient is not constant, it is difficult to obtain the linearization calibration of the integral area. After years of research and experiments, we finally achieved a major breakthrough in linearization calibration technology and achieved a very high linearity in the whole range. 3. The dual communication interface combining high-speed USB and Ethernet TCP/IP protocol has been successfully applied to the HCS-500 series high-frequency infrared carbon and sulfur analyzer of Shanghai Guo Ke Instrument Co., Ltd. ... Guo Ke HCS-500 series high-frequency infrared carbon and sulfur analyzer is the first in the industry to introduce the dual communication interface integrating high-speed USB and Ethernet TCP/IP protocol. Compared with other existing instruments based on low-speed serial port and USB single interface, it can provide more convenient on-site installation. The instrument uses the verified bottom driver of Linux operating system to communicate with PC through high-speed USB and Ethernet, which ensures the high stability of communication and the reliability of data during analysis and communication. This is essentially different from the simple communication mode that some existing instruments use 805 1 single chip microcomputer to drive USB chip. The low-speed 805 1 single chip microcomputer will interrupt the processing of USB protocol while analyzing the sampled data, which is also the reason why some existing instruments are easy to interrupt USB communication. Guo Ke HCS-500 high frequency infrared carbon and sulfur analyzer adopts 16 pipelined ARM9 processor and real-time multi-task Linux operating system, which ensures the parallel processing ability of communication and data acquisition. The software design adopts multi-thread and multi-task processing technology to realize the time error of user-level data acquisition and transmission. In the transmission control of collected data, independent sampling depends on the high real-time performance of the underlying CPU, and data processing is carried out by using the underlying data queue buffer technology and multi-data check redundancy technology. The distribution and number of data acquisition points are no longer affected by the accuracy of data transmission and analysis results. If the instrument uses PC to collect and analyze data points continuously and regularly, but now the desktop operating system on PC is a non-real-time system, the interval of sampling points will shift, which will inevitably lead to the uncertainty of analysis results. Guo Ke HCS-500 high-frequency infrared carbon and sulfur analyzer puts forward a brand-new design idea for this disadvantage, which completely realizes the high real-time sampling point and the accuracy of sampling point time interval. In the transmission protocol, the application software of PC upper computer system continuously requests data, and the bottom system sends the processed queue buffer data in real time. Each group of data packets adopts queue linked list structure to avoid data transmission loss or error. I. Instrument Usage HCS-500 infrared carbon and sulfur analyzer is an intelligent infrared analysis and measurement instrument with pyroelectric sensor as the core and composed of high-frequency induction furnace and computer. The analysis software is based on Windows operating platform, with standard Windows Chinese operating interface and humanized human-computer interaction function. Mainly used in metallurgy, machinery, commodity inspection, scientific research, chemical industry and other industries to analyze the content of carbon and sulfur in ferrous metals, nonferrous metals, rare earth metals, inorganic substances, ores, ceramics and other substances. Second, the instrument model HCS-500 high-frequency infrared carbon and sulfur analyzer consists of electronic balance, analyzer host, computer, printer and other parts. Three. Technical index: 1. Measurement range of carbon and sulfur: c: (0-10.0)% s: (0-1.0)% sample weight: 0.2g ~ 0.5g. Repeatability: The repeatability of the analyzer is expressed by relative standard deviation (RSD): ≤ 0. Indication error carbon content (%) Indication error (%) >: 0-0.0100 0.0005 > 0.0 10-0. 100 0.005 & gt； 0. 100- 1.00 0.0 10 > 1.00-4.00 0.03 & gt； 4.00- 10.00 0.07 sulfur content (%) indication error (%) >: 0-0.01000 0.0005 > 0.0 10-0.050 0.003 & gt； 0.050-0. 100 0.004 & gt； 0.100-1.000 0.020 4. The weighing range of the balance is 0.00 1g- 100g 5. Analysis time: 30s? 0? 1-60s four. Technical requirements 1. Ambient temperature: (15 ~ 30)℃ 2. Relative humidity:? 8? 060% 3. Power supply: voltage 220V? 8? 4 10% frequency 50Hz? 8? 42% power supply 5KVA grounding resistance ≤4 ohm 4. Analytical gas: oxygen purity? 8? 699.5%, cylinder pressure: > 3MPa, cylinder output pressure 0.35-0.40 MPa 5. Power gas: the output pressure of nitrogen or compressed air (purified) cylinder is 0.25-0.30 MPa, and the cylinder pressure is > 1MPa. If the power gas of the instrument is also equipped with a decompression filter, the output pressure of the cylinder should be adjusted to 0.35-0.40 MPa. 6. Gas flow: 3.0-4.0 liters/minute of gas is measured and analyzed. Power gas1.0-2.0l/min. 7. Chemical reagents: high-efficiency color-changing desiccant and high-efficiency carbon dioxide absorbent (alkali asbestos). 5. The working principle of instrument HCS. In the figure, the dark black line is connected to the circuit system, and the shallow black line is connected to the gas circuit system, and the components installed in the shielded incubator are in the dotted box. Polar molecules such as CO2 and S O2 have permanent electric dipole moment, so they have structures such as vibration and rotation. According to quantum mechanics, the fractional energy level can be coupled with incident infrared radiation with characteristic wavelength to produce absorption, and Lambert-Beer law reflects this absorption law. I = i0exp (-APL) where: i0- incident light intensity I- emergent light intensity A- absorption coefficient P- gas partial pressure L- analysis cell length HCS-500 infrared carbon-sulfur analyzer uses CO2 and SO2 at 4.26? 8? 6m and 7.4? 8? There is a strong absorption band at 6m. By measuring the change of light intensity after gas absorption and analyzing the percentage of CO2 and SO2 gas concentration, the percentage of carbon and sulfur in the sample can be indirectly determined. The analysis room includes an infrared light source, a reflector, a modulation disk, an absorption cell, a filter and a detector. The infrared light source is electrically heated to about 800℃ to generate infrared radiation, which is modulated into an 80Hz alternating signal by a modulator and incident on the absorption cell. After the infrared light is absorbed by CO2 and SO2 gas in the absorption cell, it is filtered by a narrow-band filter to remove the energy of other light radiation except the above wavelength, and then it is incident on the detector, so that the light intensity measured on the detector corresponds to the concentration of CO2 and SO2 gas, and is converted into an electrical signal through photoelectric conversion of the detector. After amplification, the analog signal is output, and after A/D analog-to-digital conversion, it is sent to the upper computer through USB communication port for normalization, and the integral inversion is the percentage content of carbon and sulfur elements. The analysis process of high-frequency infrared carbon-sulfur analyzer is: first, weigh the sample on the electronic balance, input it into the microcomputer, or input it through the keyboard, add flux, and then send it into the high frequency furnace combustion chamber to start the analysis. The first stage is oxygen blowing stage. Firstly, according to the analysis process, open the corresponding solenoid valve and introduce oxygen to remove the residual CO2 and SO2 gas in the pipeline. When the content of CO2 and SO2 gas is zero, the partial pressure p of the measured gas is zero. The second stage is the analysis and release stage, in which the furnace is turned on and the sample is heated to the release temperature. At this time, the sample is immediately oxidized under high temperature and oxygen-enriched conditions to generate CO2 and SO2 gases, which are transported to the absorption cell by oxygen as carrier gas. The output signal of the amplifier decreases with the increase of the measured gas concentration. After standardization, each data is linearized and calibrated. After analysis, linear calibration data were obtained by area integration, coefficient multiplication, division by sample weight and blank deduction.