CN202994618U - Data acquisition unit for laser particle size analyzer - Google Patents
Data acquisition unit for laser particle size analyzer Download PDFInfo
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- CN202994618U CN202994618U CN 201220717199 CN201220717199U CN202994618U CN 202994618 U CN202994618 U CN 202994618U CN 201220717199 CN201220717199 CN 201220717199 CN 201220717199 U CN201220717199 U CN 201220717199U CN 202994618 U CN202994618 U CN 202994618U
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Abstract
The utility model discloses a data acquisition unit for a laser particle size analyzer. The data acquisition unit comprises a signal conditioning circuit, an MCU (Microprogrammed Control Unit) module, a communication module and a power supply module, wherein the communication module comprises a bus transceiver and a bus adaptor; the output end of the signal conditioning circuit is connected with an AD (Analog-Digital) conversion port of the MCU module, a UART (Universal Asynchronous Receiver/Transmitter) port of the MCU module is connected with the bus transceiver, the bus transceiver is connected to a computer via the bus adaptor, and the power supply module is connected with the MCU module. The data acquisition unit can realize independent amplification, grouped acquisition and channel calibration for multiple paths of signals of a photoelectric detector, the output signals of the photoelectric detector are divided into multiple paths, the signals of multiple paths are all amplified by independent signal conditioning circuits, the signals are grouped according to the order of the corresponding detection rings, and each group of signals are acquired by different MCU module. Thus, on one hand, each path of signals are amplified independently, the amplification factor is independently adjustable, and the flexibility of the acquisition unit in use is guaranteed; and on the other hand, multiple paths of signals are acquired in a grouping manner, so that the requirement on the A/D conversion function caused by each MCU module is lowered.
Description
Technical field
The utility model relates to a kind of data acquisition unit, is specifically related to a kind of data acquisition unit for laser particle analyzer.
Background technology
Along with the development of powder industry, the grain graininess measuring technique is also had higher requirement.Objective reality ground reflection grain size and size-grade distribution are a very important job.In at present numerous technology of particle measurements, based on the laser particle analyzer of light scattering theory with its accurately, fast, the characteristics such as noncontact, obtained using very widely.
According to laser particle size measurement principle and functional requirement, complete laser particle analyzer comprises light source, sample dispersion system, receiving system, electric power system and TT﹠C system, wherein TT﹠C system is the core of whole laser particle analyzer, it generally is comprised of data acquisition unit and the TT﹠C software that runs on computing machine, has the functions such as signal condition, data acquisition, data transmission, the real-time demonstration of data, size-grade distribution are found the solution, data storage.
Summary of the invention
For the problem that prior art exists, the utility model provides a kind of data acquisition unit for laser particle analyzer.
The photodetector of laser particle analyzer is comprised of a plurality of gauging rings, namely produces the multi-channel analog voltage signal.Due to very faint by the voltage signal of photodetector output in measuring process, be a millivolt level, therefore must just can be used for data acquisition after amplifying processing.Due to the not equal reason of the light-receiving area of each gauging ring, the order of magnitude of every road signal is also uneven.In order to reduce measuring error, need to be the different enlargement factor of different channel settings, be in same order of magnitude to guarantee signal.
The technical solution of the utility model is:
A kind of data acquisition unit for laser particle analyzer comprises signal conditioning circuit, MCU module, communication module and power module;
Described signal conditioning circuit is used for the output signal of the photodetector of amplifying laser particle size analyzer;
Described MCU(Micro Control Unit) module is used for the output signal of collection signal modulate circuit and carries out the AD conversion;
Described communication module is used for carrying out communication between MCU module and computing machine, comprises bus transceiver and bus converter;
Described power module connects the MCU module;
The output terminal of described signal conditioning circuit connects the AD conversion port of MCU module, and the UART port of MCU module connects bus transceiver, and bus transceiver is connected to computing machine through bus converter.
The output signal of described photodetector is multiple signals, and multiple signals adopt all independently that signal conditioning circuit amplifies.
The output signal of described signal conditioning circuit is pressed the sequential packet of the gauging ring of photodetector, and every group of signal exports different MCU modules to.
Described bus transceiver is the LIN bus transceiver, and bus converter is the USB/LIN bus converter.
Beneficial effect:
Data acquisition unit for laser particle analyzer of the present utility model can be realized the photodetector multiple signals are carried out independent amplification, grouping collection, calibrate, the output signal of photodetector is multiple signals, multiple signals all adopt independently, and signal conditioning circuit amplifies, signal is divided into groups according to the order of the gauging ring of correspondence, and every group of signal adopts different MCU modules to gather.Be that every road signal independently amplifies so on the one hand, enlargement factor is independent adjustable, guarantees the dirigibility that collector uses; On the other hand the multiple signals grouping is gathered, reduce each MCU module to the requirement of A/D translation function.
Description of drawings
Fig. 1 is the data acquisition unit structured flowchart that is used for laser particle analyzer of the utility model embodiment;
Fig. 2 is the MCU modular circuit schematic diagram of the utility model embodiment;
Fig. 3 is the signal conditioning circuit schematic diagram of the utility model embodiment;
Fig. 4 is the communication module circuit theory diagrams of the utility model embodiment;
Fig. 5 is the power module circuitry schematic diagram of the utility model embodiment.
Embodiment
Below in conjunction with accompanying drawing, concrete enforcement of the present utility model is elaborated.
As shown in Figure 1, the data acquisition unit that is used for laser particle analyzer of present embodiment comprises signal conditioning circuit, MCU module, communication module and power module;
In present embodiment, the photodetector of laser particle analyzer is comprised of 70 gauging rings, and 70 road signals that gauging ring is exported are divided into 4 groups, carry out signals collecting with 4 MCU modules, wherein, two MCU modules are responsible for respectively gathering 18 road signals, and another two MCU modules are responsible for respectively gathering 17 road signals.
The output signal of photodetector is multiple signals, and multiple signals adopt all independently that signal conditioning circuit amplifies.The output signal of signal conditioning circuit is pressed the sequential packet of the gauging ring of photodetector, and every group of signal exports different MCU modules to.
Passage after dividing into groups and the corresponding relation of enlargement factor are as shown in table 1.
The grouping of table 1 signalling channel and enlargement factor corresponding relation
MCU(Micro Control Unit) module is used for the output signal of collection signal modulate circuit and carries out the AD conversion; The MCU module adopts the C8051F410 single-chip microcomputer, and as shown in Figure 2, wherein O1 ~ O18 is through the analog voltage signal after signal condition, as the input signal of Chip Microcomputer A/D C; RXD and TXD pin are respectively the data communication RTPs; JTAG is chip debugging interface; Owing to using internal voltage reference, connect the shunt capacitance of 0.1 μ F and 4.7 μ F between VREF and GND; Being connected a large electric capacity that shields (4.7 μ F+0.1 μ F) between voltage stabilizer output (VDD) and ground is used for elimination power supply spike and provides microcontroller (MCU) needed instant power supply.C8051F410 is fully-integrated low-power consumption mixed signal SOC (system on a chip) type MCU, has electrification reset, VDD monitor, WatchDog Timer and clock oscillator in sheet, is the SOC (system on a chip) that really can work alone.The FLASH storer also has the reprogramming ability in system, can be used for non-volatile data storage, and allows on-the-spot 8051 firmwares that upgrade.The C8051F410 single-chip microcomputer has completely all peripheral hardwares to be controlled, and can turn-off any one or all peripheral hardwares to save power consumption.
Signal conditioning circuit is used for the output signal of the photodetector of amplifying laser particle size analyzer, circuit as shown in Figure 3, wherein IN1 is the voltage signal input end, O1 is voltage signal output end; Resistance R 1 plays the effect of impedance matching; R3 is pre-resistor, and R4 is feedback resistance, and the gain of this amplifying circuit is
, by changing the proportioning of R3, R4 resistance, changed the enlargement factor of channel signal.R2, C1 form low-pass filter, are used for the filtering high frequency interference, improve system accuracy.The operation amplifier device optional TI(Texas Instrument of using wherein) the TLC2254 chip of company, this device has full supply voltage amplitude (rail to rail) output performance, has better input offset voltage and lower power consumption than CMOS amplifier simultaneously.
Signal condition is that the signal to the output of 70 gauging rings amplifies, buffering or to fix the scale by simulation signal, make it be suitable for the input of ADC, its core is to measure amplifying circuit, satisfies the independent basic demand such as adjustable, low-cost of accuracy, low-power consumption, each channel signal enlargement factor.
The problem that occurs deviation for overcoming signal amplification factor is unified calibration to all passages.Concrete grammar is: to all passage input standard signals, under the prerequisite that ADC does not overflow, the signal after amplifying is measured, then conversed the actual enlargement factor of each passage, thereby guaranteed the accuracy of every paths enlargement factor.
Communication module is used for carrying out communication between C8051F410 and computing machine as shown in Figure 4, comprises LIN bus transceiver and USB/LIN bus converter; In present embodiment, select the semi-conductive LIN transceiver TJA1020 of Philips as communication interface chip.According to the application requirements of TJA1020, the NWAKE pin is connected with VDD, as local wake source, so the TXD pin connects external pull-up resistor (R84); Microcontroller (MCU) does not have integrated pull-up resistor, so the RXD pin need to connect external pull-up resistor (R83).LIN(Local Interconnect Network) be a kind of serial communication network cheaply, be usually used in realizing that the distributed electronic system in automobile is controlled.Existing multiple multi-point solution has been simplified in the standardization of LIN, and can reduce the development and production cost.This serial communication pattern cheaply and corresponding development environment are formulated to standard by LIN association, have upgraded at present 2.0 versions.
The output terminal of signal conditioning circuit connects the AD conversion port of C8051F410, the UART port of C8051F410 connects the LIN bus transceiver, form many bus structure from node, the LIN bus transceiver is connected to computing machine through the USB/LIN bus converter, carries out communication with computing machine;
Described power module connects the MCU module; The circuit of power module as shown in Figure 5, application requirements according to AS1117, in order to guarantee its stability, at least need the tantalum electric capacity (C28) of 100 μ F as output capacitance, its value can change with output load or temperature range, use the output capacitance of 100 μ F to improve load transient corresponding, simultaneously can also the filtering low-frequency disturbance, electric capacity 100nF(C27) is used for the filtering high frequency interference.In addition, input end also connects 100uF(C26) and electric capacity 100nF(C25) be used for the filtering high and low frequency and disturb, improve the stability of supply voltage.
Claims (7)
1. a data acquisition unit that is used for laser particle analyzer, is characterized in that: comprise signal conditioning circuit, MCU module, communication module and power module;
Described communication module comprises bus transceiver and bus converter;
The output terminal of described signal conditioning circuit connects the AD conversion port of MCU module, and the UART port of MCU module connects bus transceiver, and bus transceiver is connected to computing machine through bus converter, and power module is connected with the MCU module.
2. the data acquisition unit for laser particle analyzer according to claim 1, it is characterized in that: described signal conditioning circuit is the circuit for the output signal of the photodetector of amplifying laser particle size analyzer.
3. the data acquisition unit for laser particle analyzer according to claim 1 is characterized in that: described MCU module is for the output signal of collection signal modulate circuit and the device that carries out the AD conversion.
4. the data acquisition unit for laser particle analyzer according to claim 1, it is characterized in that: described communication module is for carrying out the device of communication between MCU module and computing machine.
5. the data acquisition unit for laser particle analyzer according to claim 2, it is characterized in that: the output signal of described photodetector is multiple signals, multiple signals adopt all independently that signal conditioning circuit amplifies.
6. the data acquisition unit for laser particle analyzer according to claim 2, it is characterized in that: the output signal of described signal conditioning circuit is pressed the sequential packet of the gauging ring of photodetector, and every group of signal exports different MCU modules to.
7. the data acquisition unit for laser particle analyzer according to claim 1, it is characterized in that: described bus transceiver is the LIN bus transceiver, bus converter is the USB/LIN bus converter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220717199 CN202994618U (en) | 2012-12-24 | 2012-12-24 | Data acquisition unit for laser particle size analyzer |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201220717199 CN202994618U (en) | 2012-12-24 | 2012-12-24 | Data acquisition unit for laser particle size analyzer |
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| CN202994618U true CN202994618U (en) | 2013-06-12 |
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| CN 201220717199 Expired - Fee Related CN202994618U (en) | 2012-12-24 | 2012-12-24 | Data acquisition unit for laser particle size analyzer |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108709847A (en) * | 2018-06-22 | 2018-10-26 | 佛山融芯智感科技有限公司 | A kind of air particles detection method and detection device |
| CN108709848A (en) * | 2018-07-25 | 2018-10-26 | 佛山融芯智感科技有限公司 | A kind of air particles method of counting and device |
| CN110135549A (en) * | 2019-06-03 | 2019-08-16 | 深圳市灵明光子科技有限公司 | Photoelectric sensing chip |
-
2012
- 2012-12-24 CN CN 201220717199 patent/CN202994618U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108709847A (en) * | 2018-06-22 | 2018-10-26 | 佛山融芯智感科技有限公司 | A kind of air particles detection method and detection device |
| CN108709848A (en) * | 2018-07-25 | 2018-10-26 | 佛山融芯智感科技有限公司 | A kind of air particles method of counting and device |
| CN110135549A (en) * | 2019-06-03 | 2019-08-16 | 深圳市灵明光子科技有限公司 | Photoelectric sensing chip |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130612 Termination date: 20131224 |