CN1103949A - Self-calibration measuring method for cotton fibre polarization maturation stage - Google Patents
Self-calibration measuring method for cotton fibre polarization maturation stage Download PDFInfo
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- CN1103949A CN1103949A CN 93112624 CN93112624A CN1103949A CN 1103949 A CN1103949 A CN 1103949A CN 93112624 CN93112624 CN 93112624 CN 93112624 A CN93112624 A CN 93112624A CN 1103949 A CN1103949 A CN 1103949A
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- instrument
- sample
- maturation stage
- cotton fibre
- fibre polarization
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Abstract
Measuring Polarized light reading of three given samples whose maturity and value are known already in order to calculate accurate rating function of the device. Then, once the polarized light reading of a sample is tested, its accurate maturity is obtd. by calculation of its accurate value. The invention device can minimize error.
Description
The invention belongs to the maturity of cotton fiber field of measuring technique.Specifically, it relates to the target location survey metering method of cotton fibre polarization maturation stage.
The method of utilizing the birefringence optics characteristic of cotton fiber to measure its degree of ripeness has indirectly been listed standard GB 6099.2-85 " maturity of cotton fiber test method-polariscope method " in, and the underlying instrument y147 type cotton fibre polarization maturation stage instrument of implementing this method is also in department's widespread uses such as industry, agricultural, commerce and examinations of fibers.The measuring principle of cotton fibre polarization maturation stage instrument can be illustrated by Fig. 1.
Among Fig. 1, the light planoconvex lens 2 that incandescent spot light source 1 sends is converted into parallel beam, become polarizing light irradiation in cotton fiber sample 4 through the polarizer 3 then, the light that sees through cotton fiber sample 4 is transformed to photocurrent through analyzer 5 backs by photoelectric cell 6 again, by the numerical value of reometer 7 display light electric currents, be called " polarisation reading " at last.Because cotton fiber has the optical birefringence characteristic, when the cotton fiber sample of polarized light by differing maturity, can produce different optical path differences, behind analyzer, form different interference color, that is produce different photocurrents or polarisation reading, so the corresponding relation that can pre-determine polarisation reading and degree of ripeness by the experiment statistics method, is called " the unified scale " of instrument as a kind of unified standard or is called for short " scale ".Like this, as long as under identical test condition, just can try to achieve the degree of ripeness of arbitrary tested cotton fiber sample 4 according to above-mentioned scale relation by the polarisation reading that reometer 7 shows.
Hence one can see that, the measurement of above-mentioned cotton fibre polarization maturation stage is a kind of indirect method, its essence is by instrument tested cotton fiber sample degree of ripeness (true value) is this sample degree of ripeness measured value by unified scale conversion again after being converted to photocurrent (polarisation reading) under certain measuring condition.The unified scale of y147 type cotton fibre polarization maturation stage instrument is announced by Chinese examination of fibers office, and is as shown in table 1.
Table 1 y147 type cotton fibre polarization maturation stage instrument is unified the scale table
(fibre weight reading I
0=60)
Obviously, this measuring method gained result has very strict conditional value character, because the factor that influences the instrument photocurrent is except that the sample degree of ripeness, for example difference or the variation of light, electrical component characteristic of many conditions equally also is the factor that influences photocurrent in the measuring process.Only test condition and when pre-determining unified scale when assert the condition basically identical of employing, concern that by table 1 converting the sample degree of ripeness of trying to achieve is only accurately with recording the polarisation reading, otherwise the difference of relevant condition or variation all will cause measuring error.Therefore, Ministry of Textile Industry JJG(weaving) 049-91 vertification regulation regulation, the cotton fibre polarization maturation stage instrument before use, must try to survey with three appended standard models of instrument, the error that requires the degree of ripeness measured value of each sheet standard model and its nominal value (true value) is in ± 0.03, with affirmation apparatus measures result's accuracy, otherwise just should readjust instrument.But the impossible stable for extended periods of time unanimity of light, electrical component characteristic owing to each instrument, therefore, even instrument through adjusting repeatedly, still is difficult to reach the requirement of above-mentioned vertification regulation in practicality, this just give instrument manufacturing, proofread and correct, use and maintenance has brought very big difficulty.
The computermatic cotton fibre polarization maturation stage instrument of the y147A of Chu Xianing in recent years, be that the reometer that utilizes microcomputer system to replace former y147 type instrument is adopted into the polarisation reading, and after being scaled degree of ripeness by aforementioned unified scale, show with digital form, and can replace artificial test result being carried out statistical test and finished the conversion of several degree of ripeness indexs.But the measurement conversion rule of this instrument is still the same with the y147 type, and the problems referred to above still exist.
The objective of the invention is to utilize special self-calibration technology, eliminate y147 type ex hoc genus anne the inevitable above-mentioned measuring error of instrument, improve the accuracy that the cotton fibre polarization maturation stage instrument records the result to greatest extent.
The method that the present invention measures cotton fibre polarization maturation stage comprises the following steps:
(1) three kinds of known differing maturity k that instrument is appended
1, k
2, k
3And scale value I
A1, I
A2, I
A3Standard model insert the cotton fibre polarization maturation stage instrument successively, record the polarisation reading x of three kinds of standard models respectively
1, x
2, x
3;
(2) calculate this cotton fibre polarization maturation stage instrument calibration function f(x automatically by instrument) relevant data;
(3) sample is inserted this instrument, measure its polarisation reading x;
(4) calculate the accurate scale value I of this sample automatically by instrument
A;
(5) by the scale value I of sample
AObtain the accurate degree of ripeness K of this sample;
When (6) sample is more than one, but repeating step (3)～(5).
Above-mentioned calibration function f(x) general type is:
f（x）＝c
0x
4+c
1x
3+c
2x
2+c
3x+c
4
In the formula: the f(x) calibration function of-arbitrary cotton fibre polarization maturation stage instrument
The x-independent variable, the polarisation reading numerical value that promptly any sample records on this instrument
c
0～c
4-cross variable is determined according to given constraint condition and following formula automatically by instrument
f（x
i）＝I
Ai/X
i（i＝1，2，3）
In the formula: f(x
iCalibration function value when)-independent variable is x
I
AiThe scale value of-standard model
x
iThe accurate scale value I of the above-mentioned sample of polarisation reading numerical value that-standard model records on this instrument
ACan be calculated as follows:
I
A＝x·f（x）
In the formula: the f(x) calibration function of-arbitrary cotton fibre polarization maturation stage instrument
The x-independent variable, the polarisation reading numerical value that promptly any sample records on this instrument.
When adopting the inventive method to measure cotton fibre polarization maturation stage, even measuring condition exists to a certain degree difference or variation, instrument can both reduce measuring error to greatest extent through automatic demarcation, obtains accurate result.With regard to equipment operation, adopt the examination from calibration process and General Instrument of the cotton fibre polarization maturation stage instrument of the inventive method to survey similar process, but accurately whether the latter only can verify instrument, if in case exceed tolerance, then it is adjusted ten minutes and is hard on; And the former is through after demarcating, and need not go adjustment again, and the degree of accuracy that can guarantee instrument meets JJG(fully and weaves) regulation of 049-91.
Fig. 1 is cotton fibre polarization maturation stage instrument measuring principle figure.
Embodiment and comparative example
Instrument is joined the known degree of ripeness K(true value of three kinds of standard models) can be taken as respectively
k
1＝1.18 k
2＝1.45 k
3＝1.83
Its scale value is respectively
I
A1＝46.4 I
A2＝54.5 I
A3＝65.3
If above-mentioned three standard models are used as tested sample, to test at existing conventional instrument and of the present invention the demarcation on the formula instrument certainly of employing respectively, two kinds of instruments record the result and contrast as shown in table 2
Two kinds of instruments of table 2 record result's contrast
As shown in Table 2, above-mentioned three kinds of samples record result and true value deviation △ k(measuring error with existing conventional instrument) far see Table 2 the first half) above instrument franchise ± 0.03(, of the present inventionly record result's identical with true value (seeing Table 2 the latter halfs) from demarcating the formula instrument and adopt, eliminated conventional apparatus measures error.So can obtain effect like this, this is because be standard model by three known degree of ripeness and scale value in demarcating the formula instrument certainly, record its polarisation reading respectively, draw the calibration function of this instrument, polarisation reading by sample calculates its accurate scale value then, obtains the accurate degree of ripeness of sample at last.
Getting constraint condition from demarcation formula system in this example is C
0=0 reaches
=1
(i=1,2,3,4), then calibration function f(x) be
f（x）＝-2.2247×10
-5x
3+3.9396×10
-3x
2+0.21031x+4.882
So can be respectively accurate scale value
I
1＝x
1f（x
1）＝46.4
I
2＝x
2f（x
2）＝54.6
I
3＝x
3f（x
3）＝65.3
And then try to achieve k
1=1.18, k
2=1.45, k
3=1.83, see Table 2 the latter halfs, so can obtain satisfied test result.
Claims (4)
1, a kind of self-calibration measuring method of measuring cotton fibre polarization maturation stage, it comprises the following steps:
(1) three kinds of known differing maturity k that instrument is appended
1, k
2, k
3And scale value I
A1, I
A2, I
A3Standard model insert the cotton fibre polarization maturation stage instrument successively, record the polarisation reading X of three kinds of standard models respectively
1, X
2, X
3
(2) calculate the relevant data of this cotton fibre polarization maturation stage instrument calibration function f (X) automatically by instrument;
(3) sample is inserted this instrument, measure its polarisation reading X;
(4) calculate the accurate scale value I of this sample automatically by instrument
A
(5) by the scale value I of this sample
AObtain the accurate degree of ripeness K of this sample;
When (6) sample is more than one, but repeating step (3)～(5).
2, method according to claim 1 the invention is characterized in: general type calibration function f(x) is
f（x）＝c
0x
4+c
1x
3+c
2x
2+c
3x+c
4
In the formula: the f(x) calibration function of-arbitrary cotton fibre polarization maturation stage instrument
The x-independent variable, the polarisation reading numerical value that promptly any sample records on this instrument
c
0～c
4-cross variable
3, according to claim 1,2 described methods, the invention is characterized in: with c
0～c
4Be cross variable, determine automatically according to given constraint condition and following formula by instrument
f（x
i）＝I
Ai/X
i（i＝1，2，3）
In the formula: f(x
i)-independent variable is x
iThe time the calibration function value
I
AiThe scale value of-standard model
X
iThe polarisation reading numerical value that-standard model records on this instrument
4, method according to claim 1 the invention is characterized in the accurate scale value I of sample
ACan be calculated as follows:
I
A＝x·f（x）
In the formula: the f(x) calibration function of-arbitrary cotton fibre polarization maturation stage instrument
The x-independent variable, the polarisation reading numerical value that promptly any sample records on this instrument.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 93112624 CN1103949A (en) | 1993-12-15 | 1993-12-15 | Self-calibration measuring method for cotton fibre polarization maturation stage |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 93112624 CN1103949A (en) | 1993-12-15 | 1993-12-15 | Self-calibration measuring method for cotton fibre polarization maturation stage |
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| Publication Number | Publication Date |
|---|---|
| CN1103949A true CN1103949A (en) | 1995-06-21 |
Family
ID=4990218
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 93112624 Pending CN1103949A (en) | 1993-12-15 | 1993-12-15 | Self-calibration measuring method for cotton fibre polarization maturation stage |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005068974A1 (en) * | 2004-01-20 | 2005-07-28 | Commonwealth Scientific And Industrial Research Organisation | Method and apparatus for testing fibres |
-
1993
- 1993-12-15 CN CN 93112624 patent/CN1103949A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005068974A1 (en) * | 2004-01-20 | 2005-07-28 | Commonwealth Scientific And Industrial Research Organisation | Method and apparatus for testing fibres |
| US7705985B2 (en) | 2004-01-20 | 2010-04-27 | Commonwealth Scientific And Industrial Research Organisation | Method and apparatus for testing fibres |
| CN1910442B (en) * | 2004-01-20 | 2011-04-13 | 联邦科学和工业研究组织 | Method and apparatus for testing fibres |
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