CN201016933Y - Signal detecting element of magnetomotive oxygen content measuring instrument - Google Patents
Signal detecting element of magnetomotive oxygen content measuring instrument Download PDFInfo
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- CN201016933Y CN201016933Y CNU2007200064776U CN200720006477U CN201016933Y CN 201016933 Y CN201016933 Y CN 201016933Y CN U2007200064776 U CNU2007200064776 U CN U2007200064776U CN 200720006477 U CN200720006477 U CN 200720006477U CN 201016933 Y CN201016933 Y CN 201016933Y
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- array ccd
- magnetomotive
- signal
- line array
- measuring instrument
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Abstract
A signal detection device for a magnet-driven oxygen meter relates to an oxygen meter, in particular to the signal detection device, including a reflection mirror, a light source, a slit, a convex lens, a signal receiving device and a quantity processing system. The device is characterized in that the device for receiving signals of lights reflected by the reflection mirror is a linear array CCD. Compared with an analog signal mode, the linear array CCD device has the advantages of liability, disturbance resistance, high precision, high sensitivity, convenient installation, etc. the sensitivity can change from 0.1% to 0.04% below. The measurement precision can change from 0.2% to 0.1% below.
Description
Technical field:
The utility model relates to oxygen analyser, particularly its signal detecting device.
Prior art: magnetomotive oxygen measuring instrument is principle with the gas magnetic, utilized the paramagnetism and the magnetic susceptibility of oxygen big, nitrogen is the characteristic of diamagnetic substance, oxygen content in the gas is measured, it has the influence that is not subjected to non-measurement component variation in the mixed gas substantially, reaction velocity is fast, good stability, advantage such as measurement range is wide.
Magnetomotive oxygen measuring instrument mainly comprises measuring cell and data acquisition processing system.Measuring cell is a sensing element of measuring oxygen content, is made up of platinum filament, small reflector, glass dumbbell ball, magnetic pole.Its ultimate principle is to fill nitrogen dumbbell ball platinum filament mirror system to be suspended in the non-homogeneous high-intensity magnetic field of certain gradient, dumbbell ball system is subjected to moment loading and rotates a certain angle in the non-uniform magnetic-field of gradient, when a light beam irradiates is on level crossing, level crossing with beam reflection to photodetector.After tested gas sample was full of air chamber, the magnetic induction density between two magnetic poles was with different the changing of oxygen content of tested gas sample.The repulsion that fills the suffered magnetic field of nitrogen dumbbell ball also changes thereupon, and the anglec of rotation of dumbbell ball is also just different, and then the position of the hot spot of folded light beam on photodetector is also different, thereby may detect the different content of oxygen.
Because gas magnetic susceptibility is very faint, the suffered moment of dumbbell ball platinum filament system is very little in the measuring cell, and therefore, under the different oxygen situation, the angle that the dumbbell ball reverses changes also very little, and it is very difficult directly measuring the angle that the dumbbell ball reverses.In order to measure this micro-corner, in the middle of the connecting rod of dumbbell ball, post catoptron, adopted optical lever that the angle signal that the dumbbell ball reverses is amplified.Survey the reflection light point signal in a distance.
Traditional photodetector of past is that platinum filament is suspending in midair and fills nitrogen glass dumbbell ball in the magnetic field, dumbbell ball middle part is installed with catoptron, light source by slit, convex lens, catoptron after light reflex to the photoelectric cell surface, photoelectric cell again will be behind the signal input data processing system changes the catoptron rotational angle as the received signal device and shows in display with the oxygen level reading.Because each photoelectric cell can only be surveyed light intensity magnitude, can not survey the position of hot spot, therefore utilized two identical photoelectric cells placed side by side, receive flare.According to the difference of oxygen content in the gas, hot spot carries out simulation process in the position difference of two photoelectric cell irradiations to the differential wave of two photoelectric cell outputs, and this is a kind of analog form.Its weak point is two photoelectric cell position Installation and Debugging difficulties, complex circuit designs, and the resolution of instrument is difficult to improve.
The utility model content: the utility model provides a kind of signal detecting device of magnetomotive oxygen measuring instrument for overcoming above-mentioned defective.
Scheme of the present utility model is: the device that receives reflected light relevant position received signal corresponding to catoptron is a line array CCD.
Advantage of the present utility model be to adopt the line array CCD device than analog signaling have reliable, anti-interference, degree of accuracy is high, resolution is high, advantage such as easy for installation.Sensitivity can increase to more than 0.04% from 0.1%; Measuring accuracy can increase to more than 0.1% from 0.2%.
Description of drawings:
Fig. 1 is the measuring cell structural representation.
Fig. 2 is CCD linear array relative position figure.
Fig. 3 is the data handling system block scheme.
Embodiment:
This signal detecting device comprises catoptron (2), light source (5), slit (4), convex lens (3), received signal device, data handling system.Receiving trap corresponding to the reflected light signal position of catoptron (2) is line array CCD (1).
After light source (5) is mapped to light beam catoptron (2) by slit (4) and convex lens (3), catoptron (2) with the dumbbell ball deflector focuses on this beam reflection on the line array CCD (1), mid point along pixel before and after the hot spot signal that line array CCD (1) is received is got is effective pixel value, carry out the pattern computing along data mean value for the luminous point pixel value of sampling promptly, convert line array CCD (1) the pixel value of each oxygen content to the oxygen percentage composition again and on display, show its reading.
Adopt its advantage of line array CCD (1) contrast photoelectric cell mainly to be the small and dense collection arrangement of pixel, its errors in position measurement then only is two pixel separation (7 μ m), and degree of accuracy is also high more; And be subjected to the quantity of light valid pixel big, allow the hot spot moving range wide, the position that line array CCD can conveniently be installed, and by regulating itself and the resolution of the distance increase instrument of measuring cell.This is that photoelectric cell daylighting can't realize.Line array CCD (1) signal data disposal system adopts following way to handle:
1. the simulating signal that the comparer of sampling is exported line array CCD (1) is shaped to square wave, simplifies circuit;
2. use CPLD Programmable Logic Device design line array CCD (1) sequential circuit and interface circuit, improve data sampling efficient;
3. get the luminous point pixel value of mid point (front and back are along data mean value) for sampling of the front and back of luminous point, to reduce because of incident intensity changes the error that the bias light variation is introduced along data;
4. data are repeatedly sampled and average, improve the number of significant digit and the stability of data;
5. different temperature, oxygen content are calibrated, the row interpolation of going forward side by side reduces temperature and non-linear influence to degree of accuracy.
Thereby its line construction as shown in Figure 3: line array CCD (1) is concatenation operation amplifier, comparer, EPM7064S, 8052 single-chip microcomputers, light-emitting diode display successively.Another interface tieback line array CCD of EPM7064S
(1), line array CCD (1) (charge-coupled image sensor) produces drive signal, line array CCD by EPM7064S
(1) detected position signalling is shaped to square-wave signal and triggers EPM7064 behind amplifier and comparator circuit, and it is to CPU application interruption and send data.8052 single-chip microcomputers receive data, and carry out respective handling the result is shown by LED.
Claims (2)
1. the signal detecting device of magnetomotive oxygen measuring instrument comprises catoptron (2), light source (5), slit (4), convex lens (3), received signal device, data handling system, and the device that it is characterized in that receiving catoptron (2) reflected light signal is line array CCD (1).
2. the signal detecting device of magnetomotive oxygen measuring instrument according to claim 1, it is characterized in that data handling system is line array CCD (1) concatenation operation amplifier, comparer, EPM7064S, 8052 single-chip microcomputers, a light-emitting diode display successively, another interface tieback line array CCD (1) of EPM7064S.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200064776U CN201016933Y (en) | 2007-03-09 | 2007-03-09 | Signal detecting element of magnetomotive oxygen content measuring instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200064776U CN201016933Y (en) | 2007-03-09 | 2007-03-09 | Signal detecting element of magnetomotive oxygen content measuring instrument |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201016933Y true CN201016933Y (en) | 2008-02-06 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007200064776U Expired - Fee Related CN201016933Y (en) | 2007-03-09 | 2007-03-09 | Signal detecting element of magnetomotive oxygen content measuring instrument |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201016933Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110261309A (en) * | 2019-07-02 | 2019-09-20 | 东北大学秦皇岛分校 | A kind of magnetic driven optical coherence tomography system and its magnetic field modulation method |
| CN114002310A (en) * | 2021-11-03 | 2022-02-01 | 江苏舒茨测控设备股份有限公司 | Paramagnetic oxygen sensor with shock resistance |
-
2007
- 2007-03-09 CN CNU2007200064776U patent/CN201016933Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110261309A (en) * | 2019-07-02 | 2019-09-20 | 东北大学秦皇岛分校 | A kind of magnetic driven optical coherence tomography system and its magnetic field modulation method |
| CN110261309B (en) * | 2019-07-02 | 2021-09-28 | 东北大学秦皇岛分校 | Magnetomotive optical coherence tomography system and magnetic field modulation method thereof |
| CN114002310A (en) * | 2021-11-03 | 2022-02-01 | 江苏舒茨测控设备股份有限公司 | Paramagnetic oxygen sensor with shock resistance |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 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: 20080206 |