CN103542933A - Infrared spectrometer signal drift error tracking system - Google Patents
Infrared spectrometer signal drift error tracking system Download PDFInfo
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- CN103542933A CN103542933A CN201310515331.4A CN201310515331A CN103542933A CN 103542933 A CN103542933 A CN 103542933A CN 201310515331 A CN201310515331 A CN 201310515331A CN 103542933 A CN103542933 A CN 103542933A
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- signal drift
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Abstract
An infrared spectrometer signal drift error tracking system comprises a CPU control unit, an A/D converter connected with the CPU control unit, stepping motors, driving devices, optoelectronic switches, a storage and a communication interface. Optical signals with the frequency of 800Hz are formed through modulation, one path enters an analysis chamber, the other path is used as a reference light source, the optical signals enter a light sensor after being selected by a light switching disc, and after pre-amplification and A/D conversion, the CPU control unit carries out sampling. A CPU controls the stepping motor and the driving device to generate optical signals with different wave lengths, the wave length starting point is located by an optoelectronic switch T1, wave length points are controlled through the step number, another stepping motor and another driving device control the light switching disc to select sample light or reference light, and the initial position is located by an optoelectronic switch T2. According to the infrared spectrometer signal drift error tracking system, automatic tracking of signal parallel drift errors changing along with time is achieved, and the accuracy of a measuring instrument is improved.
Description
Technical field
The present invention relates to a kind of signal drift error tracker, be specifically related to a kind of infrared spectroscopy instrument signal drift error tracker.
Background technology
Infrared light detects through photoelectric sensor, and its output signal is very faint, need to, after multistage preposition amplification, just can reach the desired normal voltage of A/ D converter.Because the performance of prime amplifier is subject to the impacts such as device itself, environment temperature, easily form various errors, adopting correlation filtering circuit and digital filtering method can overcome low-and high-frequency disturbs, but there is the parallel drift error of a kind of time dependent signal, said method is but difficult to solve, thereby affects the precision of surveying instrument.
Summary of the invention
The invention provides a kind of infrared spectroscopy instrument signal drift error tracker, its solved the parallel drift error of time dependent signal from motion tracking, increased the precision of surveying instrument.
Technical solution of the present invention is:
A kind of infrared spectroscopy instrument signal drift error tracker, comprise CPU control module, the A/ D converter, stepper motor and drive unit, optoelectronic switch and storer and the communication interface that are connected with CPU control module, its special character is: described in be modulated into the light signal that frequency is 800Hz, one tunnel enters analysis room, another road is as with reference to light source, by light switch plate, selects the laggard optical sensor that enters, and premenstrual storing is large, by CPU control module, sampled after A/ D conversion; Described CPU control step motor and drive unit are to produce the light signal of different wave length, its wavelength starting point is located by optoelectronic switch T1, each wavelength points is controlled by step number, another stepper motor and drive unit are controlled light switch plate and are selected sample light or reference light, and its initial position is positioned by optoelectronic switch T2.
Above-mentioned A/ D converter adopts 12 high speed A/ D converter MAX197, to front putting the 800Hz AC signal Direct Sampling of output; Be 6us its switching time, adopts single 5V power supply.
Above-mentioned stepper motor and drive unit adopt 25BY4803, and step pitch is 7.50, and its controller is 4HB0lB.
Above-mentioned optoelectronic switch adopts 3 STl35 correlation flute profile optoelectronic switches to carry out respectively stepper motor location and synchronous signal obtaining.
Above-mentioned storer and communication interface show, analyze, print for storing data and the data of handling well being sent to main frame.
The invention has the advantages that: solved the parallel drift error of time dependent signal from motion tracking, increased the precision of surveying instrument.
Accompanying drawing explanation
Fig. 1 is structural principle block diagram of the present invention.
Embodiment
Referring to Fig. 1, through the mating plate of cutting of rotation, to be modulated into frequency be that the light signal ，Yi road of 800Hz enters analysis room to light source, and another road is as with reference to light source, by light switch plate, select the laggard optical sensor that enters, premenstrual storing is large, by CPU control module, sampled after A/ D conversion.In analysis room, CPU control step motor and drive unit are to produce the light signal of different wave length, its wavelength starting point is located by optoelectronic switch T1, each wavelength points is controlled by step number, another stepper motor is controlled light switch plate and is selected sample light or reference light, and its initial position is positioned by optoelectronic switch T2.
Sampling processing method
Phase-locked
Because light activated element is easily subject to astigmatism, affect, thereby produce false undesired signal, when sampling, adopt phase-lock technique to determine the starting point of each cycle of signal, can guarantee sampled point repeatability and be conducive to suppress to disturb.Light source enters to be cut mating plate before analysis room and is modulated, and frequency is 800Hz, cuts mating plate simultaneously and cuts again flute profile optoelectronic switch, obtain one with the on all four synchronizing pulse of measuring-signal frequency.When CPU carries out data sampling, using Phase-Locked Synchronous signal as the starting point of sampling, thereby guarantee the consistance of sampling point position in each cycle.
Limit filtration
Except using on hardware active band-pass filter, CPU also utilizes digital filtering to carry out data processing.By limit filtration, can effectively overcome the significantly frame hopping that sampled signal is caused by random disturbance.
Software section: mainly switch by step motor control length scanning and light path, complete data sampling and data processing.
Claims (5)
1. an infrared spectroscopy instrument signal drift error tracker, comprise CPU control module, the A/ D converter, stepper motor and drive unit, optoelectronic switch and storer and the communication interface that are connected with CPU control module, it is characterized in that: described in be modulated into the light signal that frequency is 800Hz, one tunnel enters analysis room, another road is as with reference to light source, by light switch plate, selects the laggard optical sensor that enters, and premenstrual storing is large, by CPU control module, sampled after A/ D conversion; Described CPU control step motor and drive unit are to produce the light signal of different wave length, its wavelength starting point is located by optoelectronic switch T1, each wavelength points is controlled by step number, another stepper motor and drive unit are controlled light switch plate and are selected sample light or reference light, and its initial position is positioned by optoelectronic switch T2.
2. infrared spectroscopy instrument signal drift error tracker according to claim 1, described A/ D converter adopts 12 high speed A/ D converter MAX197, to front putting the 800Hz AC signal Direct Sampling of output; Be 6us its switching time, adopts single 5V power supply.
3. infrared spectroscopy instrument signal drift error tracker according to claim 1, described stepper motor and drive unit adopt 25BY4803, and step pitch is 7.50, and its controller is 4HB0lB.
4. infrared spectroscopy instrument signal drift error tracker according to claim 1, described optoelectronic switch adopts 3 STl35 correlation flute profile optoelectronic switches to carry out respectively stepper motor location and synchronous signal obtaining.
5. infrared spectroscopy instrument signal drift error tracker according to claim 1, described storer and communication interface show, analyze, print for storing data and the data of handling well being sent to main frame.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310515331.4A CN103542933A (en) | 2013-10-28 | 2013-10-28 | Infrared spectrometer signal drift error tracking system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310515331.4A CN103542933A (en) | 2013-10-28 | 2013-10-28 | Infrared spectrometer signal drift error tracking system |
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| Publication Number | Publication Date |
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| CN103542933A true CN103542933A (en) | 2014-01-29 |
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| CN201310515331.4A Pending CN103542933A (en) | 2013-10-28 | 2013-10-28 | Infrared spectrometer signal drift error tracking system |
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| CN (1) | CN103542933A (en) |
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- 2013-10-28 CN CN201310515331.4A patent/CN103542933A/en active Pending
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