CN101229813A - System calibrating method for improving measurement accuracy - Google Patents
System calibrating method for improving measurement accuracy Download PDFInfo
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- CN101229813A CN101229813A CNA2007101786149A CN200710178614A CN101229813A CN 101229813 A CN101229813 A CN 101229813A CN A2007101786149 A CNA2007101786149 A CN A2007101786149A CN 200710178614 A CN200710178614 A CN 200710178614A CN 101229813 A CN101229813 A CN 101229813A
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Abstract
The invention discloses a system calibration method for improving the measurement precision, which avoids the effect on temperature measurement precision due to different probe performance. After the probe is installed or replaced, a probe respond curve corresponding to the probe can be obtained by carrying out calibration once with blackbody and calculating by a computer system without inputting a respond curve of each probe or replacing any program manually, so as to avoid the effect on the temperature measurement precision due to different probe performance. When the change of probe performance is big, calibration is carried out once with the blackbody and the probe respond curve corresponding to the current performance of the probe can be obtained through the calculation of the computer system, thus guaranteeing the precision of temperature measurement of the system.
Description
Technical field
The invention belongs to railway infrared equipment field, relate to a kind of system calibrating method, particularly a kind of system calibrating method that improves survey precision.
Background technology
In the train axle temperature detection system of using, adopt usually probe is demarcated at present, manually adjust the way of sonde response curve according to the error of demarcating.
Even the sonde response curve is correct,, also can cause system's temperature measurement error bigger if there are error in the signal processing circuit of train axle temperature detection system and part of data acquisition.In the train axle temperature detection system of using at present, usually adopt the gain of signal processing circuit and data acquisition circuit is carried out the adjustment (adjustment potentiometer) of feedback resistance to avoid the influence of this part error, step is more loaded down with trivial details, and the circuit that every kind of need are adjusted is all wanted the feed-in standard signal.
Chinese patent application numbers 92225136.3, publication number 2124173, open day is on December 9th, 1992, name is called the train axle temperature detection system that discloses employing mercury cadmium telluride infrared sensor modem probe in " railway with infrared ray hot box detector ".The infrared journal temperature detection system is when calculating axle temperature, and the output voltage values during according to probe detection train axle box is tried to achieve the axle box temperature on the sonde response curve.Because the performance inconsistency of mercury cadmium telluride infrared sensor is bigger, the sonde response curve of different probes has very big-difference, and after changing probe, if adopt same sonde response curve, the detection system temperature measurement error is bigger.Therefore, after new installation or changing probe, need the response curve of each probe is manually adjusted, or the new installation that the laboratory is recorded or the response curve that newly changes probe deposit calculation procedure in, this process need is manually imported the response curve or the replacing program of each probe, if the sonde response curve is installed or newly changed probe and be not inconsistent with new, then cause detection system to have bigger temperature measurement error.
Document: a kind of new infrared hot shaft detection system, railway society, 2005,27 (4), 114-118 points out to carry out system calibrating with black matrix, remedies the probe inconsistency, but unexposed concrete method of calculating.
Summary of the invention
The purpose of this invention is to provide a kind of system calibrating method that improves survey precision, this method is by to the correction of sonde response curve, eliminates the influence of the inconsistent and systematic error of probe performance, the temperature measurement accuracy height.
A kind of system calibrating method that improves survey precision of the present invention comprises the following steps:
Step 1: the controllable temperature black matrix that certain distance of probe detection is outer, obtain the probe output voltage of surveying black matrix, and the temperature of record black matrix;
Step 2:, the sonde response curve is proofreaied and correct according to the probe output voltage and the blackbody temperature that record;
Step 3: the probe detection measurand, obtain the probe output voltage of surveying measurand;
Step 4: the temperature of calculating measurand according to the sonde response curve linear difference after proofreading and correct.
The controllable temperature black matrix is apart from probe 1000mm in the described step 1, and blackbody temperature is set to higher 40 ℃ than the ring temperature.
In the described step 2 the sonde response curve proofreaied and correct and be meant the magnitude of voltage V that on the sonde response curve, calculates the point of blackbody temperature in the corresponding step 1, with V divided by the probe output voltage values that records in the step 1, obtain correction parameter r, the magnitude of voltage that has an ordinate to represent on the former sonde response curve all divided by parameter r, is promptly got the sonde response curve after proofreading and correct.
A kind of advantage that improves the system calibrating method of survey precision of the present invention is:
(1) the present invention once demarcates with black matrix after probe is installed or changed, and calculates through computer system, can obtain and this cooresponding sonde response curve of popping one's head in, and has eliminated the influence of the inconsistent and systematic error of probe performance to temperature measurement accuracy.
(2) the present invention does not need the response curve of each probe is manually adjusted after probe is installed or changed, and does not need manually to import the response curve or the replacing program of each probe yet.
(3) the present invention once demarcates with black matrix when pop one's head in performance or systematic error change greatly, calculates through computer system, can obtain and this probe and the cooresponding sonde response curve of system's current performance, has guaranteed system's temperature measurement accuracy.
Description of drawings
Fig. 1 is a kind of system calibrating method scheme drawing that improves survey precision of the present invention;
Fig. 2 is a kind of system calibrating method diagram of circuit that improves survey precision of the present invention;
Fig. 3 is a kind of sonde response curve synoptic diagram that improves the system calibrating method of survey precision of the present invention;
Fig. 4 is the temperature error correlation curve before and after employing this method of HBDS-III type infrared journal temperature detection system probe 1 of a kind of system calibrating method that improves survey precision of the present invention;
Fig. 5 is the temperature error correlation curve before and after employing this method of HBDS-III type infrared journal temperature detection system probe 2 of a kind of system calibrating method that improves survey precision of the present invention.
Among the figure: 1. modem probe 2. controllable temperature black matrixes 3. corner motors 4. measurands 5. acquisition controlling computing machines
The specific embodiment
The present invention is described in further detail below in conjunction with accompanying drawing.
A kind of system calibrating method that improves survey precision, this method is after installing or changing probe, do not need manually to import the response curve or the replacing program of each probe, once demarcate with black matrix, calculate through computer system, can obtain and this cooresponding sonde response curve of popping one's head in, eliminate of the influence of the inconsistent and systematic error of probe performance temperature measurement accuracy.When pop one's head in performance or systematic error change greatly, once demarcate with black matrix, calculate through computer system, can obtain and this probe and the cooresponding sonde response curve of system's current performance, guaranteed system's temperature measurement accuracy.
As shown in Figure 1, modem probe 1 is connected with acquisition controlling computing machine 5, acquisition controlling computing machine 5 is by corner motor 3 control controllable temperature black matrixes 2, and acquisition controlling computing machine 5 is surveyed controllable temperature black matrix 2 by modem probe 1, and the data that detection obtains are carried out analytical calculation.Controllable temperature black matrix 2 is 1000mm apart from modem probe 1, and controllable temperature black matrix 2 temperature are set to than the ring temperature is high 40 ℃ on every side, and acquisition controlling computing machine 5 has been analyzed controllable temperature black matrix 2 backs and measured measurand 4.
A kind of system calibrating method that improves survey precision of the present invention as shown in Figure 2, comprises the following steps:
Step 1: acquisition controlling computing machine 5 control modem probes 1 are surveyed controllable temperature black matrix 2, controllable temperature black matrix 2 is positioned over distance modulated probe 1 is the position of 1000mm, aim at modem probe 1.The temperature of controllable temperature black matrix 2 is set to higher 40 ℃ than the ring temperature, and acquisition controlling computing machine 3 record modem probes 1 are surveyed the output voltage V of controllable temperature black matrix 2
1Temperature T with black matrix
1
Step 2: as shown in Figure 3, acquisition controlling computing machine 5 is according to the probe output voltage V of the controllable temperature black matrix 2 that records
1With object temperature T
1, former sonde response curve carries out translation along the translation of probe output voltage coordinate direction to the sonde response curve and proofreaies and correct:
According to object temperature T
1Linear difference on former sonde response curve promptly in the system of axes at former sonde response curve place, judges that with the mode of circulation difference abscissa is T
1Point on former sonde response curve between which two adjacent (t (n), v (n)), (t (n+1), v (n+1)) point, make t (n)≤T
1≤ t (n+1), this is put cooresponding ordinate and is the probe output voltage V of calculating gained through difference
2, promptly
1≤n≤N wherein, N is the number of the point on the sonde response curve.
With V
2Divided by 1 output voltage V of the modem probe in the step 1
1, obtaining correction parameter r, the magnitude of voltage that the corresponding ordinate of the sonde response curve 1 in the accompanying drawing 3 is represented is divided by parameter r, promptly gets the sonde response curve after the correction in the accompanying drawing 3.
Step 3: acquisition controlling computing machine 5 control modem probes 1 are surveyed measurand 4, and acquisition controlling computing machine 5 record modem probes 1 are surveyed the output voltage V of measurand 4
0
Step 4: according to the output voltage V of the probe detection measurand 4 of acquisition controlling computing machine in the step 35 record
0, linear interpolation on the sonde response curve of acquisition controlling computing machine 5 after accompanying drawing 3 is proofreaied and correct promptly on the sonde response curve after the correction, judges that with the on-cycle mode ordinate is V
0Point on corrected sonde response curve between which two adjacent (t (n), v (n)), (t (n+1), v (n+1)) point, cooresponding abscissa is for calculating the temperature T of the measurand 4 of gained through difference
0, promptly
1≤n≤N wherein.
Adopt HBDS-III type infrared journal temperature detection system to test, as Fig. 4, shown in Figure 5, as can be seen from Figure, the temperature measurement accuracy of using this method is better than not using the temperature measurement accuracy of this method greatly.
Claims (3)
1. a system calibrating method that improves survey precision is characterized in that, comprises the following steps:
Step 1: the controllable temperature black matrix that certain distance of probe detection is outer, obtain the probe output voltage of surveying black matrix, and the temperature of record black matrix;
Step 2:, the sonde response curve is proofreaied and correct according to the probe output voltage and the blackbody temperature that record;
Step 3: the probe detection measurand, obtain the probe output voltage of surveying measurand;
Step 4: the temperature of calculating measurand according to the sonde response curve linear difference after proofreading and correct.
2. a kind of system calibrating method that improves survey precision of the present invention according to claim 1 is characterized in that: the controllable temperature black matrix is apart from probe 1000mm in the described step 1, and blackbody temperature is set to higher 40 ℃ than the ring temperature.
3. a kind of system calibrating method that improves survey precision of the present invention according to claim 1, it is characterized in that: in the described step 2 sonde response curve proofreaied and correct and be meant the magnitude of voltage V that on the sonde response curve, calculates the point of blackbody temperature in the corresponding described step 1, with V divided by the probe output voltage values that records in the described step 1, obtain correction parameter r, the magnitude of voltage that has an ordinate to represent on the former sonde response curve all divided by parameter r, is promptly got the sonde response curve after proofreading and correct.
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| CNA2007101786149A CN101229813A (en) | 2007-12-03 | 2007-12-03 | System calibrating method for improving measurement accuracy |
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| CNA2007101786149A CN101229813A (en) | 2007-12-03 | 2007-12-03 | System calibrating method for improving measurement accuracy |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102133899A (en) * | 2011-03-24 | 2011-07-27 | 北京康拓红外技术有限公司 | Temperature-measuring error correction method, equipment and system |
| CN102818635A (en) * | 2012-08-25 | 2012-12-12 | 河南省高远公路养护技术有限公司 | Method for improving calibration precision of infrared sensor |
| CN103983933A (en) * | 2014-05-08 | 2014-08-13 | 工业和信息化部电子第五研究所 | Calibration measurement and frequency calibration method, system and device of board-level radio-frequency current probe |
| CN104714122A (en) * | 2013-12-13 | 2015-06-17 | 旺矽科技股份有限公司 | Operation method of detection system |
| CN105466575A (en) * | 2015-12-29 | 2016-04-06 | 河南理工大学 | Measurement device and calibration method used for consistency calibration |
| CN105607679A (en) * | 2015-12-22 | 2016-05-25 | 北京康拓红外技术股份有限公司 | Photon probe intelligent gain control device and method based on train axle temperature detection |
-
2007
- 2007-12-03 CN CNA2007101786149A patent/CN101229813A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102133899A (en) * | 2011-03-24 | 2011-07-27 | 北京康拓红外技术有限公司 | Temperature-measuring error correction method, equipment and system |
| CN102818635A (en) * | 2012-08-25 | 2012-12-12 | 河南省高远公路养护技术有限公司 | Method for improving calibration precision of infrared sensor |
| CN102818635B (en) * | 2012-08-25 | 2015-06-10 | 河南省高远公路养护技术有限公司 | Method for improving calibration precision of infrared sensor |
| CN104714122A (en) * | 2013-12-13 | 2015-06-17 | 旺矽科技股份有限公司 | Operation method of detection system |
| CN103983933A (en) * | 2014-05-08 | 2014-08-13 | 工业和信息化部电子第五研究所 | Calibration measurement and frequency calibration method, system and device of board-level radio-frequency current probe |
| CN103983933B (en) * | 2014-05-08 | 2017-09-19 | 工业和信息化部电子第五研究所 | Plate level RF current probe frequency demarcating method and system and device |
| CN105607679A (en) * | 2015-12-22 | 2016-05-25 | 北京康拓红外技术股份有限公司 | Photon probe intelligent gain control device and method based on train axle temperature detection |
| CN105466575A (en) * | 2015-12-29 | 2016-04-06 | 河南理工大学 | Measurement device and calibration method used for consistency calibration |
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Open date: 20080730 |