CN102252755A - Online measurement apparatus and method of multispectral emissivity based on cylindrical lead reflector - Google Patents

Abstract

This invention provides an online measurement apparatus and method for multispectral emissivity based on a cylindrical front-mounted reflector, relating to an online measurement apparatus and method for spectral emissivity and solving the problems of lower detection precision and easiness of damaging measured materials in the traditional online measurement method of multispectral emissivity. The side wall bottom of the cylindrical front-mounted reflector is connected with a guide rail in a sliding way; an optical aiming probe is hung right above a test piece to be measured, and the detecting surface of the optical aiming probe faces to the upper surface of the test piece to be measured; and the signal inputting end of a multiplex spectrometer is connected with the signal outputting end of the optical aiming probe through an optical fiber. According to the online measurement apparatus and method disclosed by the invention, online measurement of emissivity is realized through the cylindrical front-mounted reflector and the optical fiber type multiplex spectrometer, the non-contact online measurement is realized without the need of damaging the surface of the test piece to be measured, and the measuring precision is high. The online measurement apparatus and method disclosed by the invention are applicable to the object emissivity measurement.

Description

Multispectral emissivity on-line measurement device and method based on the preposition reverberator of cylinder type

Technical field

The present invention relates to a kind of spectral emittance on-line measurement device and method.

Background technology

The emissivity of object is one of basic parameter of describing the object thermorodiative property.It all has important effect in space flight and aviation, military and national defense and industrial and agricultural production.As all inseparable in the thermal control of satellite, guidance and stealthy, sun power utilization, Infrared Heating and the radiation temperature measurement field with the material emissivity.The research of being engaged in the material emissivity has both at home and abroad obtained bigger progress in recent years, has solved spectral emittance problems of measurement in the laboratory.But modern military technology, material science and energy science be badly in need of can online emissivity measurement equipment, research in this regard is also seldom.

Present the most practical number conversion black matrix method and the multispectral method of On-line Measuring Method, other method is difficult to satisfy the actual needs of on-line measurement emissivity.Conversion black matrix method ultimate principle is boring or add reflex housing on sample, make measured material approach black matrix or become black matrix, make the radiation power of under same temperature, measuring black matrix and sample respectively with same detector, thereby obtain the material emissivity, this method can cause the damage of measured material, and it is lower to detect the smart end; Multispectral radiation thermometry is the object radiation brightness measurement information of utilizing under a plurality of spectrum, obtains the true temperature and the spectral emittance of object through data processing.Its advantage is: can directly measure emissivity, detection speed is fast, and is portable etc.; Shortcoming is: only be applicable to the sample of reduced size, easily measured material damaged, need to install some aids around target.

Summary of the invention

The present invention is for the accuracy of detection problem lower, that easily measured material is damaged that solves existing spectral emittance On-line Measuring Method, thereby a kind of multispectral emissivity on-line measurement device and method based on the preposition reverberator of cylinder type is provided.

Multispectral emissivity on-line measurement device based on the preposition reverberator of cylinder type, it comprises multispectral instrument, optical laying probe, the preposition reverberator of cylinder type, guide rail and bracing frame, the two ends of guide rail are fixed on the bracing frame, and the main body of guide rail is horizontally disposed with, and are positioned at the top of test specimen to be measured; The preposition reverberator of cylinder type is the under shed structure, and the end face of the preposition reverberator of cylinder type has the optical radiation hole, and the sphere bottom of the preposition reverberator of described cylinder type is slidingly connected with guide rail; Optical laying probe be suspended on test specimen to be measured directly over, and the test surface of described optical laying probe is towards the upper surface of test specimen to be measured; The distance of the test surface of optical laying probe and the upper surface of test specimen to be measured is greater than the height of the preposition reverberator of cylinder type; The signal input part of multispectral instrument is connected with the signal output part of optical laying probe.

Based on the multispectral emissivity On-line Measuring Method based on the preposition reverberator of cylinder type of said apparatus, it is realized by following steps:

Step 1, with the preposition reverberator of cylinder type move to test specimen to be measured directly over, adopt the optical laying alignment probe and survey the radiation laser beam in the optical radiation hole of the preposition reverberator end face of cylinder type,

According to formula:

L ₁(λ，T)＝f(ε(λ，T))L(λ，T)

Acquisition is perpendicular to the radiance L of test specimen in-plane to be measured ₁(λ, T), in the formula: (ε (λ, T)) is the preposition reflector cavities effective emissivity of a cylinder type function to f; (λ T) is the test specimen to be measured surface radiance of black matrix under the same conditions to L;

Step 2, the preposition reverberator translation of cylinder type is gone out the investigative range of optical laying probe detection face, adopt the radiation laser beam of optical laying probe direct detection test specimen upper surface to be measured, and according to formula:

L ₂(λ，T)＝ε(λ，T)L(λ，T)

Acquisition is perpendicular to the radiance L of test specimen to be measured place in-plane ₂(λ, T), (λ T) is the normal direction spectral emittance on test specimen to be measured surface to ε in the formula, and (λ T) is the test specimen to be measured surface radiance of black matrix under the same conditions to L;

Step 3, according to formula:

$V_{{\mathrm{\λ}}_i,R}=R\left({\mathrm{\λ}}_i\right)L_1({\mathrm{\λ}}_i,T)$

Obtain to add in the light path under the preposition reverberator situation of cylinder type multispectral instrument in wavelength X _iUnder voltage output value

According to formula:

$V_{{\mathrm{\λ}}_i,S}=R\left({\mathrm{\λ}}_i\right)L_2({\mathrm{\λ}}_i,T)$

Obtain not add in the light path under the preposition reverberator situation of cylinder type multispectral instrument in wavelength X _iUnder voltage output value

In the formula: R (λ _i) be the spectral response functions of the multispectral instrument of optical fiber type, for arbitrary wavelength X _iFollowing R (λ _i) be certain value;

Step 4, according to formula

$V_{{\mathrm{\λ}}_i,1}/V_{{\mathrm{\λ}}_i,2}=f\left(\mathrm{\ϵ}(\mathrm{\λ},T)\right)/\mathrm{\ϵ}(\mathrm{\λ},T)$

Obtain test specimen 4 to be measured emissivity (λ, T).

Beneficial effect: of the present inventionly realize the emissivity on-line measurement, need not to destroy test specimen to be measured surface and realized the noncontact on-line measurement by the multispectral instrument of the preposition reverberator of cylinder type and optical fiber type, measurement result precision height, and be easy to safeguard, workable.

Description of drawings

Fig. 1 is the result schematic diagram of apparatus of the present invention; Fig. 2 is that the A-A of Fig. 1 is to cut-open view.

Embodiment

Embodiment one, this embodiment is described in conjunction with Fig. 1 and Fig. 2, multispectral emissivity on-line measurement device based on the preposition reverberator of cylinder type, it comprises multispectral instrument 1, optical laying probe 3, the preposition reverberator 5 of cylinder type, guide rail 6 and bracing frame, the two ends of guide rail 6 are fixed on the bracing frame, the main body of guide rail is horizontally disposed with, and is positioned at the top of test specimen 4 to be measured; The preposition reverberator 5 of cylinder type is the under shed structure, and the end face of the preposition reverberator 5 of cylinder type has the optical radiation hole, and the sphere bottom of the preposition reverberator 5 of described cylinder type is slidingly connected with guide rail 6; Optical laying probe 3 be suspended on test specimen 4 to be measured directly over, and the test surface of described optical laying probe 3 is towards the upper surface of test specimen 4 to be measured; The distance of the test surface of optical laying probe 3 and the upper surface of test specimen to be measured 4 is greater than the height of the preposition reverberator 5 of cylinder type; The signal input part of multispectral instrument 1 is connected with the signal output part of optical laying probe 3.Described guide rail 6 can make the preposition reverberator 5 of cylinder type realize two dimensional motion.

Optical laying among the present invention probe 3 is so that multispectral instrument 1 is measured the radiance of sample object under test 4 under the different situations by the optical radiation hole of aiming at the preposition reverberator 5 of cylinder type and test specimen to be measured 4.

The difference of the described multispectral emissivity on-line measurement device based on the preposition reverberator of cylinder type of embodiment two, this embodiment and embodiment one is, it also comprises optical fiber 2, and the signal input part of multispectral instrument 1 is connected by the signal output part of optical fiber 2 with optical laying probe 3.

The difference of embodiment three, this embodiment and embodiment one or two described multispectral emissivity on-line measurement devices based on the preposition reverberator of cylinder type is, it also comprises stepper motor, and described stepper motor is used to drive the length direction translation of the preposition reverberator 5 of cylinder type along guide rail.

The difference of the described multispectral emissivity on-line measurement device based on the preposition reverberator of cylinder type of embodiment four, this embodiment and embodiment three is, it also comprises computing machine, and the signal output part of multispectral instrument 1 is connected with the signal input part of computing machine.

The difference of the described multispectral emissivity on-line measurement device based on the preposition reverberator of cylinder type of embodiment five, this embodiment and embodiment one, two or four is that multispectral instrument 1 is the multispectral instrument of optical fiber.

Multispectral instrument 1 among the present invention be by beam splitting system with the emittance collimation of optical fiber 2 conduction, the parallel light beam of the multichannel with different angles that chromatic dispersion becomes different wave length, be imaged on the focal plane and absorbed by multielement detector array.Detector array is finished that radiation energy is converted to electric energy and is carried out subsequent treatment after the electrical system of being made up of prime amplifier and sampling holder etc. transmits computer with the data of gathering.

The difference of the described multispectral emissivity on-line measurement device based on the preposition reverberator of cylinder of embodiment six, this embodiment and embodiment five is, the preposition reverberator 5 of cylinder type is the preposition reverberator of cylinder type after polishing for inside surface.

Embodiment seven, based on embodiment one described multispectral emissivity On-line Measuring Method based on the preposition reverberator of cylinder, it is realized by following steps:

Step 1, with the preposition reverberator 5 of cylinder type move to test specimen 4 to be measured directly over, adopt optical laying probe 3 to survey the radiation laser beam in the optical radiation hole of preposition reverberator 5 end faces of cylinder types,

According to formula:

L ₁(λ，T)＝f(ε(λ，T))L(λ，T)

Acquisition is perpendicular to the radiance L of test specimen 4 in-planes to be measured ₁(λ, T), in the formula: (ε (λ, T)) is the preposition reverberator 5 cavity effective emissivity functions of cylinder type to f; (λ T) is the test specimen to be measured 4 surfaces radiances of black matrix under the same conditions to L;

Step 2, preposition reverberator 5 translations of cylinder type are gone out the pop one's head in investigative range of 3 test surfaces of optical laying, adopt the pop one's head in radiation laser beam of 3 direct detections test specimen 4 upper surfaces to be measured of optical laying, and according to formula:

L ₂(λ，T)＝ε(λ，T)L(λ，T)

Acquisition is perpendicular to the radiance L of test specimen to be measured place in-plane ₂(λ, T), (λ T) is the normal direction spectral emittance on test specimen to be measured surface to ε in the formula, and (λ T) is the test specimen to be measured 4 surfaces radiances of black matrix under the same conditions to L;

Step 3, according to formula:

$V_{{\mathrm{\λ}}_i,R}=R\left({\mathrm{\λ}}_i\right)L_1({\mathrm{\λ}}_i,T)$

Obtain to add in the light path under preposition reverberator 5 situations of cylinder type multispectral instrument 1 in wavelength X _iUnder voltage output value

According to formula:

$V_{{\mathrm{\λ}}_i,S}=R\left({\mathrm{\λ}}_i\right)L_2({\mathrm{\λ}}_i,T)$

Obtain not add in the light path under preposition reverberator 5 situations of cylinder type multispectral instrument 1 in wavelength X _iUnder voltage output value

In the formula: R (λ _i) be the spectral response functions of the multispectral instrument of optical fiber type, for arbitrary wavelength X _iFollowing R (λ _i) be certain value;

Step 4, according to formula

$V_{{\mathrm{\λ}}_i,1}/V_{{\mathrm{\λ}}_i,2}=f\left(\mathrm{\ϵ}(\mathrm{\λ},T)\right)/\mathrm{\ϵ}(\mathrm{\λ},T)$

Obtain test specimen 4 to be measured emissivity (λ, T).

Claims (7)

1. based on the multispectral emissivity on-line measurement device of the preposition reverberator of cylinder type, it is characterized in that: it comprises multispectral instrument (1), optical laying probe (3), the preposition reverberator of cylinder type (5), guide rail (6) and bracing frame, the two ends of guide rail (6) are fixed on the bracing frame, the main body of guide rail is horizontally disposed with, and is positioned at the top of test specimen to be measured (4); The preposition reverberator of cylinder type (5) is the under shed structure, and the end face of the preposition reverberator of cylinder type (5) has the optical radiation hole, and the sphere bottom of the preposition reverberator of described cylinder type (5) is slidingly connected with guide rail (6); Optical laying probe (3) be suspended on test specimen to be measured (4) directly over, and the test surface of described optical laying probe (3) is towards the upper surface of test specimen to be measured (4); The distance of the test surface of optical laying probe (3) and the upper surface of test specimen to be measured (4) is greater than the height of the preposition reverberator of cylinder type (5); The signal input part of multispectral instrument (1) is connected with the signal output part of optical laying probe (3).

2. the multispectral emissivity on-line measurement device based on the preposition reverberator of cylinder type according to claim 1, it is characterized in that it also comprises optical fiber (2), the signal input part of multispectral instrument (1) is connected by the signal output part of optical fiber (2) with optical laying probe (3).

3. the multispectral emissivity on-line measurement device based on the preposition reverberator of cylinder type according to claim 1 and 2, it is characterized in that it also comprises stepper motor, described stepper motor is used to drive the length direction translation of the preposition reverberator of cylinder type (5) along guide rail.

4. the multispectral emissivity on-line measurement device based on the preposition reverberator of cylinder type according to claim 3 is characterized in that it also comprises computing machine, and the signal output part of multispectral instrument (1) is connected with the signal input part of computing machine.

5. according to claim 1,2 or 4 described multispectral emissivity on-line measurement devices, it is characterized in that multispectral instrument (1) is the multispectral instrument of optical fiber based on the preposition reverberator of cylinder type.

6. the multispectral emissivity on-line measurement device based on the preposition reverberator of cylinder type according to claim 5 is characterized in that the preposition reverberator of cylinder type (5) is the preposition reverberator of cylinder type after polishing for inside surface.

7. based on requiring 1 described multispectral emissivity On-line Measuring Method based on the preposition reverberator of cylinder type, it is characterized in that: it is realized by following steps:

Step 1, with the preposition reverberator of cylinder type (5) move to test specimen to be measured (4) directly over, adopt optical laying probe (3) to aim at and survey the radiation laser beam in the optical radiation hole of the preposition reverberator of cylinder type (5) end face,

According to formula:

L ₁(λ，T)＝f(ε(λ，T))L(λ，T)

Acquisition is perpendicular to the radiance L of test specimen to be measured (4) place in-plane ₁(λ, T), in the formula: (ε (λ, T)) is defined as the preposition reverberator of cylinder type (5) cavity effective emissivity function to f, and wherein (λ T) is the normal direction spectral emittance on test specimen to be measured surface to ε, and it is the function of wavelength X and temperature T; (λ T) is test specimen to be measured (4) the surface radiance of black matrix under the same conditions to L;

Step 2, the preposition reverberator of cylinder type (5) translation is gone out the investigative range of optical laying probe (3) test surface, adopt the radiation laser beam of optical laying probe (3) direct detection test specimen to be measured (4) upper surface, and according to formula:

L ₂(λ，T)＝ε(λ，T)L(λ，T)

Acquisition is perpendicular to the radiance L of test specimen in-plane to be measured ₂(λ, T), (λ T) is the normal direction spectral emittance on test specimen to be measured surface to ε in the formula;

Step 3, according to formula:

$V_{{\mathrm{\λ}}_i,R}=R\left({\mathrm{\λ}}_i\right)L_1({\mathrm{\λ}}_i,T)$

Obtain to add in the light path under the preposition reverberator of cylinder type (5) situation multispectral instrument (1) in wavelength X _iUnder voltage output value

According to formula:

$V_{{\mathrm{\λ}}_i,S}=R\left({\mathrm{\λ}}_i\right)L_2({\mathrm{\λ}}_i,T)$

Obtain not add in the light path under the preposition reverberator of cylinder type (5) situation multispectral instrument (1) in wavelength X _iUnder voltage output value

In the formula: R (λ _i) be the spectral response functions of the multispectral instrument of optical fiber type, for arbitrary wavelength X _iFollowing R (λ _i) be certain value;

Step 4, according to formula

$V_{{\mathrm{\λ}}_i,1}/V_{{\mathrm{\λ}}_i,2}=f\left(\mathrm{\ϵ}(\mathrm{\λ},T)\right)/\mathrm{\ϵ}(\mathrm{\λ},T)$

Obtain test specimen to be measured (4) emissivity (λ, T).