CN201464441U - Digital UV detector - Google Patents
Digital UV detector Download PDFInfo
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- CN201464441U CN201464441U CN2009200755913U CN200920075591U CN201464441U CN 201464441 U CN201464441 U CN 201464441U CN 2009200755913 U CN2009200755913 U CN 2009200755913U CN 200920075591 U CN200920075591 U CN 200920075591U CN 201464441 U CN201464441 U CN 201464441U
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Abstract
The utility model discloses a digital UV detector, which relates to high-performance liquid phase UV detector, wherein, the digital UV detector adopts a data preprocessing technology and a digital interface which can be directly connected with a chromatography data processing station. The digital UV detector comprises a variable-wavelength double-beam UV optical mechanism with a sample pool and a reference pool, a main control panel and an amplifying circuit board at least. The main control panel comprises an SOC (System on a Chip) with a DAC (Digital Analog Converter). The amplifying circuit comprises two acquisition modules, and the first acquisition module is connected between the sample pool and the DAC of the SOC for collecting detection signal of sample from the sample pool; the second acquisition module is connected between the reference pool and the DAC of the SOC for collecting detection signal of reference light; the DAC of the SOC calculates the detection signal of sample and the detection signal of reference light for obtaining digital raw data of UV detection signal.
Description
Technical field
The utility model relates to the ultraviolet detection technology, relates in particular to a kind of high performance liquid chromatogram UV-detector.
Background technology
Existing UV-detector technology adopts analog signal processing technology, promptly detects ultraviolet signal by photoelectric sensor (can be silicon photocell or photomultiplier cell).Need amplify respectively two ways of optical signals for the UV-detector that detects principle based on twin-beam, and the logarithm operation that carries out simulating signal by logarithmic amplifier, convert the photosignal that detects to the test sample proportion relation simulating signal, be connected to analog signal interface output.Shown in Fig. 1 a and Fig. 1 b, the analog signal output of existing UV-detector must connect chromatographic data collecting device, again analog signal conversion is become digital signal by chromatographic data collecting device, be connected with all kinds of chromatographic data works of treatment station by digital interface then and realize that chromatographic data is handled and various number reason is calculated; Connecting miscellaneous equipment as system then can be more complicated, as will just being connected to chromatographic data work of treatment station by the conversion of central control unit with high pressure constant flow pump, automatic sampler, being connected of chromatogram column temperature control box equipment.
The stability of the analog signal output interface of UV-detector depends on the stability of mimic channel various factors, yet objectively there is the influence that the influence, external analog interface circuit of labile factors such as temperature drift, light intensity drift connect to be increased signal attenuation and noise in mimic channel, so traditional UV-detector needs long start stabilization time, otherwise be difficult to accurate Measurement and analysis result as quantitative test.
Existing UV-detector only provides analog interface to be connected with outside miscellaneous equipment, does not therefore possess the digital interface technical functionality, does not also possess with miscellaneous equipment to realize automatic control function.
The utility model then provides a kind of new UV-detector in order to improve or to address the above problem.
The utility model content
The technical problems to be solved in the utility model provides a kind of digitizing UV-detector, it has adopted data preconditioning technique and digital interface, overcome because of what interface connected and caused that this UV-detector can be connected directly to the chromatographic data work of treatment and stand to the problem of signal attenuation and increase noise.
The utility model solves above-mentioned technical matters by such technical scheme:
A kind of digitizing UV-detector can be connected to chromatographic data work of treatment station, high pressure constant flow pump, chromatographic column temperature control case and automatic sampler, and it comprises variable wavelength twin-beam ultraviolet optics mechanism, master control borad, magnification circuit plate at least; Variable wavelength twin-beam ultraviolet optics mechanism comprises a sample cell and a reference cell; Wherein:
Described master control borad comprises a SOC (system on a chip) that includes analog to digital conversion circuit;
Described magnification circuit plate comprises two acquisition modules, and first acquisition module is connected between the analog to digital conversion circuit of described sample cell and SOC (system on a chip), is used for from sample cell collected specimens detection signal; Second acquisition module is connected between the analog to digital conversion circuit of described reference cell and SOC (system on a chip), is used for gathering the reference light detecting signal from reference cell;
The analog to digital conversion circuit of SOC (system on a chip) to reference light detecting signal and sample detection signal operation to obtain the signal digitalized raw data of ultraviolet detection.
As a kind of improvement of the present utility model, described first acquisition module comprises first silicon photocell, first amplifier and first variable gain amplifier of series connection successively, and the other end of first silicon photocell is connected with sample cell; The other end of first variable gain amplifier is connected to analog-digital conversion circuit as described.
As a kind of improvement of the present utility model, described second acquisition module comprises second silicon photocell, second amplifier and second variable gain amplifier of series connection successively, and the other end of second silicon photocell is connected with reference cell; The other end of second variable gain amplifier is connected to the reference voltage end of analog-digital conversion circuit as described.
As a kind of improvement of the present utility model, the saturating fenestra of the ultraviolet light of first silicon photocell and sample cell position is accurately to inserting; The saturating fenestra of the ultraviolet light of second silicon photocell and reference cell position is accurately to inserting.
As a kind of improvement of the present utility model, SOC (system on a chip) has fixing nominal level input; Analog-digital conversion circuit as described compares reference light detecting signal and nominal level from second variable gain amplifier earlier, measure data value, the gain of synchronous change second variable gain amplifier and the gain of first variable gain amplifier that obtains according to nominal level.
As a kind of improvement of the present utility model, but first and second silicon photocells, first and second amplifiers, the installation site of first and second gain amplifiers on magnification circuit plate are symmetrically distributed fully.
As a kind of improvement of the present utility model, described digitizing UV-detector comprises a digital interface circuit, and described digital interface circuit input end is connected to a serial delivery outlet of SOC (system on a chip), and output terminal is connected to chromatographic data work of treatment station.
As a kind of improvement of the present utility model, described digitizing UV-detector also comprises a digital interface circuit, and its input end is connected to a serial delivery outlet of SOC (system on a chip), and output terminal is connected to high pressure constant flow pump, chromatographic column temperature control case and automatic sampler.
As a kind of improvement of the present utility model, SOC (system on a chip) also comprises a D/A converting circuit and an analog interface, and D/A converting circuit links to each other with analog interface; The signal of SOC (system on a chip) after with the digitizing of the reference light detecting signal gathered and sample detection signal is converted to simulating signal output by D/A converting circuit.
As a kind of improvement of the present utility model, SOC (system on a chip) also comprises a slippage filtering data processing module, the digital signal that obtains by analog-to-digital conversion module is carried out the slippage filtering data handle to filter undesired signal.
Compared with prior art, the utlity model has following advantage:
The utility model can be realized digitizing ultraviolet detection data preconditioning technique: at first under the different wave length condition, its light intensity energy variation causes the problem that detection sensitivity differs greatly more greatly, adopted under different wavelength measurement conditions, analog to digital conversion circuit by SOC (system on a chip), earlier reference light detecting signal and known definite nominal level are carried out digitizing relatively, measure the data value that obtains according to nominal level, select rational amplifier gain to obtain best detection sensitivity, particularly improve the detection sensitivity under the more weak situation of light intensity energy.Amplifier can be selected four kinds of different gain amplifiers (k=1,2,4,8) automatically, when selecting rational amplifier gain also synchronous change the gain of two variable gain amplifiers, not only can guarantee the detection sensitivity under the different wave length condition but also improved degree of stability and the accuracy measured.
Secondly, in signal acquisition process, make full use of the characteristic of change-over circuit, finish the twin-beam two paths of signals by one tunnel analog to digital conversion passage and measure.Being about to the reference light detecting signal is connected with the reference signal input end of the analog to digital conversion circuit of SOC (system on a chip) by variable gain amplifier, the sample detection signal also is connected to the input test side of the analog to digital conversion circuit of SOC (system on a chip) by variable gain amplifier, make the sample detection signal carry out the ratio computing with the reference light detecting signal all the time, realized automatic compensation that the time drift of ultraviolet light detection signal and light intensity drift are carried out, simultaneously, in the process of data acquisition, realized obtaining automatically in real time the ratio data of reference light detecting signal and sample detection signal again, only need during afterwards data processing carry out digitized logarithm operation, can obtain sample absorbance raw data analog-to-digital data.
The 3rd, aspect the data pre-service, SOC (system on a chip) also comprises a slippage filtering data processing module, it can carry out the processing of slippage filtering data to obtaining measurement data, can filter the undesired signal of the instantaneous variation of influence measurement, and the slippage time window of digital filtering can numeral be set, and has smoothed data processing capacity flexibly, and is organized into the digital information of the data processing requirement of satisfying chromatographic data work of treatment station.
The 4th, integrated chromatographic data collecting device function also realizes digital interface.SOC (system on a chip) also has the dual serial digital interface.One, as after connect the serial digital interface at chromatographic data work of treatment station, receive the control signal at chromatographic data work of treatment station, transmit the digitized metrical information of UV-detector, in UV-detector, expanded the digital interface of data collector.They are two years old, the digital interface that connects miscellaneous equipment such as high pressure constant flow pump, automatic sampler, chromatogram column temperature control box equipment as system, transmit the control command and the status signal of chromatographic data work of treatment station and other high pressure constant flow pump, automatic sampler, chromatogram column temperature control box, realize the automatic control function of digitizing of computing machine, contained the central control unit that be connected of chromatographic data work of treatment station with miscellaneous equipment.
The 5th, kept traditional analog signal interface, the D/A converting circuit that includes in SOC (system on a chip) is as traditional analog signal output interface.After the digitizing of SOC (system on a chip), will gather digitized signal very easily and be converted to simulating signal by D/A converting circuit and export the reference light detecting signal gathered and sample detection signal.
The 6th, adopted Programmable Logic Device, solved being connected of SOC (system on a chip) and other circuit, as the digital drive signals of LCD interface, deuterium lamp and grating motor.
Description of drawings
Fig. 1 is the block diagram that is connected of chromatographic data work of treatment station and UV-detector in the prior art.
Fig. 2 is the connecting frame figure at the utility model digitizing UV-detector and chromatographic data work of treatment station.
Fig. 3 is the frame diagram of the utility model digitizing UV-detector.
Fig. 4 is local element connecting frame figure in the utility model digitizing UV-detector.
Fig. 5 is the element distribution plan of magnification circuit plate in the utility model digitizing UV-detector.
Embodiment
Describe embodiment of the present utility model in detail below in conjunction with accompanying drawing.
See also Fig. 2, the utility model provides a kind of digitizing UV-detector, and it has at least one digital interface, and by this digital interface, UV-detector can be directly connected to chromatographic data work of treatment station.In addition, UV-detector also comprises another digital interface, can be directly connected to high pressure constant flow pump, chromatographic column temperature control case and automatic sampler by this digital interface.
See also Fig. 3 and Fig. 4, described UV-detector comprises variable wavelength twin-beam ultraviolet optics mechanism 1, grating step motor drive and Power supply for deuterium lamp control panel 2, master control borad 3, magnification circuit plate 4, LCD interface circuit 5 and digital and analog signaling output interface circuit 6.
Variable wavelength twin-beam ultraviolet optics mechanism 1 comprises deuterium lamp light source, grating and grating stepper motor, semi-transparent semi-reflecting lens, catoptron, sample cell and reference cell.
Grating step motor drive and Power supply for deuterium lamp control panel 2 are connected to variable wavelength twin-beam ultraviolet optics mechanism 1 and master control borad 3, be used to provide the grating step motor drive and stable constant current source Power supply for deuterium lamp and master control borad 3 power supplys are provided, and sequential control deuterium lamp opening and closing in accordance with regulations.
Also comprise a D/A converting circuit in the SOC (system on a chip), it can be used as traditional analog interface, exports as simulating signal.After the digitizing of SOC (system on a chip) with the reference light detecting signal gathered and sample detection signal, can directly be converted to simulating signal output by D/A converting circuit with gathering digitized signal.
Magnification circuit plate 4 is connected between master control borad 3 and the variable wavelength twin-beam ultraviolet optics mechanism 1, first and second variable gain amplifiers that distribute first and second silicon photocells, first and second amplifiers that are connected with two silicon photocells respectively and be connected with two amplifiers respectively on the magnification circuit plate 4.Wherein first silicon photocell is gathered the sample detection signal of sample cell in the variable wavelength twin-beam ultraviolet optics mechanism 1, and transmits the analog to digital conversion circuit of SOC (system on a chip) by first amplifier and first variable gain amplifier; Second silicon photocell is used to gather the reference light detecting signal in the reference cell, and is sent to the reference voltage end of analog-digital conversion circuit as described via second amplifier and second variable gain amplifier.The analog to digital conversion circuit of SOC (system on a chip) carries out digitizing relatively to reference light detecting signal and nominal level from second variable gain amplifier earlier, measure the data value that obtains according to nominal level, select rational amplifier gain, and the gain of synchronous change first and second variable gain amplifiers.
The defeated interface circuit 6 of digital and analog signaling is connected with SOC (system on a chip) on the master control borad 3, and it comprises two digital interface circuits and at least one analog signal output interface; Wherein
The input end of first digital interface circuit is connected to a serial delivery outlet of SOC (system on a chip), and output terminal is connected to chromatographic data work of treatment station, realizes total digitalization control and data processing function automatically.
The input end of second digital interface circuit is connected to a serial delivery outlet of SOC (system on a chip), and output terminal is connected to high pressure constant flow pump, chromatographic column temperature control case and automatic sampler.
Analog signal output interface directly connects the D/A converting circuit of SOC (system on a chip), to failing to realize the user of digitizing operation, keep traditional analog signal output interface, be output as (16 D/A converter signals of 0-1V) absorbance (0-2000.00mAu) simulating signal.
Fig. 5 is the element distribution plan of magnification circuit plate in the utility model digitizing UV-detector, and wherein magnification circuit plate 4 is installed in the airtight magazine, and magazine is provided with two pilot holes that are symmetrically distributed fully.Magnification circuit plate 4 is provided with the pedestal that is used to install two silicon photocells, guaranteed the exact positions that two silicon photocells are installed, and by two pilot holes guaranteed two silicon photocells respectively with the saturating fenestra of the ultraviolet light position of the sample cell of variable wavelength twin-beam ultraviolet optics mechanism 1 and reference cell accurately to inserting.But two silicon photocells, first and second amplifiers, the installation sites of first and second gain amplifiers on magnification circuit plate 4 are symmetrically distributed fully.In addition, two variable gain amplifier gains also are synchronous variations, and in the present embodiment, amplifier gain has (k=1,2,4,8) four kinds of different selections.The method that amplifier gain is selected automatically is the analog to digital conversion circuit by SOC (system on a chip), earlier reference light detecting signal and known definite nominal level are carried out digitizing relatively, measure the data value that obtains according to nominal level, select rational amplifier gain to obtain best detection sensitivity, and the gain of synchronous change first and second variable gain amplifiers, can not influence the accuracy of testing result.
Digitizing UV-detector of the present utility model can realize digitizing ultraviolet detection data preconditioning technique.Be about to two-way ultraviolet signal that magnification circuit plate 4 collects analog to digital conversion circuit, obtain the measurement data of sample detection signal and reference light detecting signal by SOC (system on a chip) inside; Then, the logarithm operation by the ratio of SOC (system on a chip) calculation sample detection signal and reference light detecting signal obtains the signal digitalized raw data of ultraviolet detection.
SOC (system on a chip) also comprises a slippage filtering data processing module, it can carry out the processing of slippage filtering data to obtaining measurement data, the characteristic of slippage filtering is to require to set the slippage time window according to Data Detection, in the official hour window, carry out the digital computation of slippage smothing filtering level and smooth original sampling data, can filter the undesired signal of the instantaneous variation that influence measures.The smoothed data processing capacity can't realize in traditional analog signal processing flexibly.
According to the twin-beam measuring principle, need detect simultaneously twin-beam signal (being sample detection signal and reference light detecting signal) and carry out logarithm operation, detect and the twin-beam signal is detected common needs two cover analog to digital conversion circuit simultaneously.SOC (system on a chip) of the present utility model will be through the reference light detecting signal that the amplifies reference voltage as analog-converted, therefore only need carrying out analog to digital conversion through the sample detection signal after amplifying, can the time drift and the light intensity drift of light detecting signal be compensated like this, realized again obtaining automatically in real time the reference light detecting signal and the ratio of sample detection signal, when data processing, only need analog-to-digital data are carried out digitized logarithm operation etc., can obtain the sample absorbance.
The above only is a better embodiment of the present utility model; protection domain of the present utility model does not exceed with above-mentioned embodiment; as long as the equivalence that those of ordinary skills do according to the utility model institute disclosure is modified or changed, all should include in the protection domain of putting down in writing in claims.
Claims (10)
1. a digitizing UV-detector can be connected to chromatographic data work of treatment station, high pressure constant flow pump, chromatographic column temperature control case and automatic sampler, and it comprises variable wavelength twin-beam ultraviolet optics mechanism, master control borad, magnification circuit plate at least; Variable wavelength twin-beam ultraviolet optics mechanism comprises a sample cell and a reference cell; It is characterized in that:
Described master control borad comprises a SOC (system on a chip) that includes analog to digital conversion circuit;
Described magnification circuit plate comprises two acquisition modules, and first acquisition module is connected between the analog to digital conversion circuit of described sample cell and SOC (system on a chip), is used for from sample cell collected specimens detection signal; Second acquisition module is connected between the analog to digital conversion circuit of described reference cell and SOC (system on a chip), is used for gathering the reference light detecting signal from reference cell;
The analog to digital conversion circuit of SOC (system on a chip) to reference light detecting signal and sample detection signal operation to obtain the signal digitalized raw data of ultraviolet detection.
2. digitizing UV-detector according to claim 1 is characterized in that: described first acquisition module comprises first silicon photocell, first amplifier and first variable gain amplifier of series connection successively, and the other end of first silicon photocell is connected with sample cell; The other end of first variable gain amplifier is connected to analog-digital conversion circuit as described.
3. digitizing UV-detector according to claim 1 is characterized in that: described second acquisition module comprises second silicon photocell, second amplifier and second variable gain amplifier of series connection successively, and the other end of second silicon photocell is connected with reference cell; The other end of second variable gain amplifier is connected to the reference voltage end of analog-digital conversion circuit as described.
4. according to each described digitizing UV-detector of claim 1 to 3, it is characterized in that: the saturating fenestra of the ultraviolet light of first silicon photocell and sample cell position is accurately to inserting; The saturating fenestra of the ultraviolet light of second silicon photocell and reference cell position is accurately to inserting.
5. digitizing UV-detector according to claim 4 is characterized in that: SOC (system on a chip) has fixing nominal level input; Analog-digital conversion circuit as described compares reference light detecting signal and nominal level from second variable gain amplifier earlier, measure data value, the gain of synchronous change second variable gain amplifier and the gain of first variable gain amplifier that obtains according to nominal level.
6. digitizing UV-detector according to claim 4 is characterized in that: but first and second silicon photocells, first and second amplifiers, the installation site of first and second gain amplifiers on magnification circuit plate are symmetrically distributed fully.
7. digitizing UV-detector according to claim 1, it is characterized in that: described digitizing UV-detector comprises a digital interface circuit, described digital interface circuit input end is connected to a serial delivery outlet of SOC (system on a chip), and output terminal is connected to chromatographic data work of treatment station.
8. digitizing UV-detector according to claim 1, it is characterized in that: described digitizing UV-detector also comprises a digital interface circuit, its input end is connected to a serial delivery outlet of SOC (system on a chip), and output terminal is connected to high pressure constant flow pump, chromatographic column temperature control case and automatic sampler.
9. according to claim 7 or 8 described digitizing UV-detector, it is characterized in that: SOC (system on a chip) also comprises a D/A converting circuit and an analog interface, and D/A converting circuit links to each other with analog interface; The signal of SOC (system on a chip) after with the digitizing of the reference light detecting signal gathered and sample detection signal is converted to simulating signal output by D/A converting circuit.
10. digitizing UV-detector according to claim 9 is characterized in that: SOC (system on a chip) also comprises a slippage filtering data processing module, the digital signal that obtains by analog-to-digital conversion module is carried out the slippage filtering data handle to filter undesired signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009200755913U CN201464441U (en) | 2009-07-31 | 2009-07-31 | Digital UV detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009200755913U CN201464441U (en) | 2009-07-31 | 2009-07-31 | Digital UV detector |
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| Publication Number | Publication Date |
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| CN201464441U true CN201464441U (en) | 2010-05-12 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2009200755913U Expired - Lifetime CN201464441U (en) | 2009-07-31 | 2009-07-31 | Digital UV detector |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104777259A (en) * | 2015-04-16 | 2015-07-15 | 浙江福立分析仪器有限公司 | Ultraviolet detector optical subdivision device |
| CN112904772A (en) * | 2021-01-20 | 2021-06-04 | 上海为讷科学仪器有限公司 | Special thick film circuit applied to electronic circuit precision measurement and signal processing |
-
2009
- 2009-07-31 CN CN2009200755913U patent/CN201464441U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104777259A (en) * | 2015-04-16 | 2015-07-15 | 浙江福立分析仪器有限公司 | Ultraviolet detector optical subdivision device |
| CN112904772A (en) * | 2021-01-20 | 2021-06-04 | 上海为讷科学仪器有限公司 | Special thick film circuit applied to electronic circuit precision measurement and signal processing |
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| GR01 | Patent grant | ||
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Granted publication date: 20100512 |