CN201707319U - Detecting circuit device for oxide inside stainless steel pipe - Google Patents
Detecting circuit device for oxide inside stainless steel pipe Download PDFInfo
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- CN201707319U CN201707319U CN2010201651562U CN201020165156U CN201707319U CN 201707319 U CN201707319 U CN 201707319U CN 2010201651562 U CN2010201651562 U CN 2010201651562U CN 201020165156 U CN201020165156 U CN 201020165156U CN 201707319 U CN201707319 U CN 201707319U
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- operational amplifier
- converter
- differential operational
- microprocessor
- magnetic field
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Abstract
The utility model relates to a detecting circuit device for oxide inside a stainless steel pipe, which comprises a magnetic field strength sensor, a DA converter, a differential operational amplifier, an AD converter, a microprocessor and a programmable resistor. An output end of the sensor is connected with a positive input end of the differential operational amplifier, an output end of the differential operational amplifier is connected with an input end of the AD converter, an output end of the AD converter is connected with an input end of the microprocessor, an output end of the microprocessor is respectively connected with the programmable resistor and the DA converter, the programmable resistor is connected with the differential operational amplifier, and an output end of the DA converter is connected with a negative input end of the differential operational amplifier. The detecting circuit device for oxide inside the stainless steel pipe completely resolves the problem that weak magnetizing signals are difficult to be measured and increases signal to noise ratio of the weak signals. Simultaneously, differential reference voltage can be set optionally, thereby greatly reducing requirements of mounting positions and mounting uniformity of the magnetic field strength sensor.
Description
Technical field
The utility model relates to a kind of stainless-steel tube inner oxide testing circuit device, in particular, relates to a kind of circuit arrangement that deposition oxide detects in the stainless-steel tube that is used for.
Background technology
When stainless steel superheater and reheater tubes are worked under the high temperature gas flow condition, the endoporus of steel pipe is oxidized easily, because the expansion coefficient of magnetic oxide and the content of oxide are closely related, the oxide iron-holder of pressing close to pipe is more, and that the oxide of internal layer contains chromium is more, and when temperature during at 90 ℃-150 ℃, outer field oxide will split away off from internal layer, under the effect of gravity, the outer oxide thing come off and the deposition of internal layer oxide causes superheater to stop up.
A kind of method and relevant detection device of magnetic Non-Destructive Testing have been described in ZL 200710121994.2, in this detection method, apply stable high-intensity magnetic field from nonmagnetic austenitic stainless steel outside, ferromagnetic oxide magnetization in will managing, the stray magnetic field signal that utilizes magnetic-field-sensitive element testing oxide to produce from the pipeline outside can judge whether there is oxide in the pipeline.But the detection signal of this pick-up unit is easy to reach capacity, and has following deficiency:
1, in it is described, adopted signal transducer and reference sensor to produce signal voltage and reference voltage.This sensor is owing to be in strong steady magnetic field, and output voltage is easy to reach capacity.
2, use this device will reach differential amplifier and be output as zero, eliminate background signal, must make that being input as of difference amplifier two ends is zero, it is consistent just will to adjust two sensor output voltages sizes.When the actual installation sensor, accomplish this point, quite difficulty.
3, the enlargement factor of difference amplifier is non-adjustable, causes measuring accuracy low, and measurement range is little.
Summary of the invention
In order to overcome the defective that existing austenitic stainless steel oxide detection technique exists, the utility model provides a kind of stainless-steel tube inner oxide testing circuit device, the reference voltage of operational amplifier is set by external microprocessor, eliminated ground unrest, improve feeble signal extractability and signal to noise ratio (S/N ratio), enlarge dynamic range of signals, and greatly facilitated Installation and Debugging.
The technical scheme that its technical matters that solves the utility model adopts is:
A kind of stainless-steel tube inner oxide testing circuit device, it comprises magnetic field strength transducer, the DA converter, differential operational amplifier, AD converter, microprocessor, programmable resistance, the output terminal of sensor is connected with the positive input terminal of differential operational amplifier, the differential operational amplifier output terminal is connected with the AD converter input end, the output terminal of AD converter is connected with the microprocessor input end, the output terminal of microprocessor respectively with programmable resistance, the DA converter is connected, programmable resistance links to each other with differential operational amplifier, the output terminal of DA converter is connected with the negative input end of differential operational amplifier, the oxide magnetic field intensity signal that sensor arrives after differential operational amplifier amplifies again after the AD converter conversion, read oxide magnetic field voltage by microprocessor, and according to the oxide magnetic field voltage that measures, calculate, voltage reference value is set, by DA converter output reference voltage, reference voltage is put on the input end of differential operational amplifier, the enlargement factor that microprocessor control programmable resistance is regulated differential operational amplifier.
The operational amplifier output voltage of the reference voltage of described differential operational amplifier during according to oxide-free adjusted one by one through feedback calculation, is zero until the differential operational amplifier output voltage.
Described sensor adopts general magnetic field strength transducer, and output type is an aanalogvoltage.
Described differential operational amplifier is the instrument and meter operational amplifier.
Own AD converter and DA converter in the described microprocessor.
Owing to adopted above-mentioned technical scheme, the utility model has solved the problem that is difficult to measure faint magnetization signal fully, has improved the signal to noise ratio (S/N ratio) of feeble signal.Because differential reference voltage can be provided with arbitrarily, therefore greatly reduce the magnetic field strength transducer installation site and conforming requirement is installed simultaneously.Adopt the benefit of a kind of stainless-steel tube inner oxide of the utility model testing circuit device mainly to show: oxide input signal to noise ratio (S/N ratio) height, highly sensitive, debug measurement is simple, sensing station is easy for installation flexibly, does not have complicated technological requirement.
Description of drawings
Fig. 1 is a kind of stainless-steel tube inner oxide of the utility model testing circuit device synoptic diagram.
Embodiment
Fig. 1 is a system architecture schematic diagram of the present utility model, and the utility model provides a kind of stainless-steel tube inner oxide testing circuit device.This circuit arrangement structure as shown in Figure 1, it comprises magnetic field strength transducer 1, DA converter 2, AD converter 4, differential operational amplifier 3, programmable resistance 7, microprocessor 5 and Control Software 6.The output terminal of sensor 1 is connected with the positive input terminal of differential operational amplifier 3, differential operational amplifier 3 output terminals are connected with AD converter 4 input ends, the output terminal of AD converter 4 is connected with the microprocessor input end, the output terminal of microprocessor is connected with programmable resistance 7, DA converter 2 respectively, programmable resistance 7 links to each other with differential operational amplifier 3, and the output terminal of DA converter 2 is connected with the negative input end of differential operational amplifier 3.
Sensor 1 is used to detect the magnetic field intensity of oxide of being magnetized, and sensor 1 can adopt general magnetic field strength transducer, and output type is an aanalogvoltage.Differential operational amplifier 3 is used to amplify faint magnetic field intensity, and differential operational amplifier 3 can be common operational amplifier, also can be the instrument and meter operational amplifier.Measurement, amplifier reference voltage that microprocessor 5 is used to finish magnetic field intensity signal calculate and system's control.The operational amplifier output voltage of the value of setting of the reference voltage of operational amplifier during according to oxide-free is through feedback calculation, adjust one by one, be output as zero until operational amplifier, microprocessor 5 can be 8,16,32 single-chip microcomputers or flush bonding processor, also can use the microprocessor that AD converter and DA converter are arranged in the sheet.AD conversion 4 and DA conversion 2 can be converters independently, also can adopt in the microprocessor sheet from tape cell.Programmable resistance 7 is used to regulate the enlargement factor of operational amplifier 3, and programmable resistance 7 can be general digital resistance device, programmable resistance etc.
Sensor 1 detected oxide magnetic field intensity signal after differential operational amplifier 3 amplifies again after AD converter 4 conversions, read oxide magnetic field voltage by microprocessor 5, and according to the magnetic field voltage that measures, calculate, be provided with voltage reference value, by DA converter 2 output reference voltage Vref, reference voltage Vref is put on the input end of differential operational amplifier 3, thereby eliminate background voltage, the signal to noise ratio (S/N ratio) and the sensitivity that improve the oxide field signal.Microprocessor 5 control programmable resistances 7 are regulated differential operational amplifier 3 enlargement factors.
When differential voltage equalled zero, the output voltage of operational amplifier 3 also was zero, after AD converter 4 conversions, receive by microprocessor 5, and by Control Software 6 computings and saving result.When not having oxide in the tested stainless-steel tube, sensor 1 can only receive the magnetic field intensity that is used to magnetize oxide, and this magnetic field intensity signal Vin size can produce different voltage signal Vin by the determining positions of sensor 1 at this moment.The differential signal of input operational amplifier 3 can not equal zero naturally yet, thereby causes input operational amplifier 3 very fast saturated under high-gain.After microprocessor 5 receives this saturated large-signal, after Control Software 6 comparison operations, revise reference voltage, be input to differential operational amplifier 3 through the DA converter, reduce the differential voltage signal of input operational amplifier 3, from then on repeat to adjust reference voltage, trend towards zero until input operational amplifier 3 output voltages, write down this reference voltage level, be called Vref, as a setting reference voltage.Equal the reference voltage Vref of microprocessor 5 outputs this moment by the voltage of magnetic field strength transducer 1 output Vin.
V
+＝Vin
V
-＝Vref
Vo=A (V
+-V
-)=A (Vin-Vref)=0 (A is an enlargement factor)
When in the tested stainless-steel tube oxide being arranged, sensor 1 promptly receives the magnetic field intensity Vin that was used to magnetize oxide originally, also receive the magnetic field intensity Vs that the oxide that is magnetized produces, this moment, this magnetic field intensity voltage signal (Vin+Vs) was compared original magnetic field intensity signal Vin, change Vs with having faint voltage signal, this light current is pressed signal Vs output Vos after differential operational amplifier 3 difference are amplified, transform through AD converter 4, receive by microprocessor 5, thereby, can determine the degree of congestion of steel pipe inner oxide in the stainless-steel tube according to voltage Vos size.
V
+＝Vin+Vs
V
-＝Vref
Vos=A (V
+-V
-)=A (Vin+Vs-Vref)=AVs (A is an enlargement factor)
When the magnetic field intensity Vs that produces when the oxide that is magnetized is big, can pass through programmable resistance 7, reduce the enlargement factor of differential operational amplifier 3.When the magnetic field intensity Vs of the oxide generation that is magnetized is more weak, can pass through programmable resistance 7, improve the enlargement factor of differential operational amplifier 3.Because the reference voltage of differential operational amplifier 3 can be provided with arbitrarily, thus the requirement of sensor 1 output voltage that reduces, the requirement of sensor 1 installation site of having weakened.
The utility model circuit arrangement is introduced programmable reference voltage and amplifier programmable-gain, can with faint detection signal correct be amplified to suitable size, improved the accuracy of the chocking-up degree of estimation stainless-steel tube inner oxide greatly.
Claims (5)
1. stainless-steel tube inner oxide testing circuit device, it is characterized in that: it comprises magnetic field strength transducer (1), DA converter (2), differential operational amplifier (3), AD converter (4), microprocessor (5), programmable resistance (7), the output terminal of sensor (1) is connected with the positive input terminal of differential operational amplifier (3), differential operational amplifier (3) output terminal is connected with AD converter (4) input end, the output terminal of AD converter (4) is connected with the microprocessor input end, the output terminal of microprocessor respectively with programmable resistance (7), DA converter (2) is connected, programmable resistance (7) links to each other with differential operational amplifier (3), the output terminal of DA converter (2) is connected with the negative input end of differential operational amplifier (3), the detected oxide magnetic field intensity signal of sensor (1) after differential operational amplifier (3) amplifies again after AD converter (4) conversion, read oxide magnetic field voltage by microprocessor, and according to the oxide magnetic field voltage that measures, calculate, voltage reference value is set, by DA converter (2) output reference voltage (Vref), reference voltage (Vref) is put on the input end of differential operational amplifier (3), the enlargement factor that microprocessor control programmable resistance (7) is regulated differential operational amplifier (3).
2. a kind of stainless-steel tube inner oxide testing circuit device according to claim 1, it is characterized in that: the operational amplifier output voltage of the reference voltage (Vref) of described differential operational amplifier (3) during according to oxide-free is through feedback calculation, adjusting one by one, is zero until differential operational amplifier (3) output voltage.
3. a kind of stainless-steel tube inner oxide testing circuit device according to claim 1 and 2, it is characterized in that: described sensor (1) adopts general magnetic field strength transducer, and output type is an aanalogvoltage.
4. a kind of stainless-steel tube inner oxide testing circuit device according to claim 1 and 2, it is characterized in that: described differential operational amplifier (3) is the instrument and meter operational amplifier.
5. a kind of stainless-steel tube inner oxide testing circuit device according to claim 1 and 2 is characterized in that: own AD converter (4) and DA converter (2) in the described microprocessor (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201651562U CN201707319U (en) | 2010-04-20 | 2010-04-20 | Detecting circuit device for oxide inside stainless steel pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201651562U CN201707319U (en) | 2010-04-20 | 2010-04-20 | Detecting circuit device for oxide inside stainless steel pipe |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201707319U true CN201707319U (en) | 2011-01-12 |
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ID=43444479
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010201651562U Expired - Fee Related CN201707319U (en) | 2010-04-20 | 2010-04-20 | Detecting circuit device for oxide inside stainless steel pipe |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201707319U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105675713A (en) * | 2016-04-06 | 2016-06-15 | 山西慧达澳星科技有限公司 | Nondestructive detection device and method for elevator dragging steel band |
| CN108627190A (en) * | 2017-07-28 | 2018-10-09 | 无锡思泰迪半导体有限公司 | A kind of high-precision Magnetic Sensor correcting structure and bearing calibration based on integrated circuit |
-
2010
- 2010-04-20 CN CN2010201651562U patent/CN201707319U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105675713A (en) * | 2016-04-06 | 2016-06-15 | 山西慧达澳星科技有限公司 | Nondestructive detection device and method for elevator dragging steel band |
| CN105675713B (en) * | 2016-04-06 | 2018-08-07 | 山西慧达澳星科技有限公司 | A kind of elevator traction steel band non-destructive testing device and method |
| CN108627190A (en) * | 2017-07-28 | 2018-10-09 | 无锡思泰迪半导体有限公司 | A kind of high-precision Magnetic Sensor correcting structure and bearing calibration based on integrated circuit |
| CN108627190B (en) * | 2017-07-28 | 2023-12-19 | 杭州思泰微电子有限公司 | High-precision magnetic sensor correction structure and correction method based on integrated circuit |
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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: 20110112 Termination date: 20120420 |