CN2064883U

CN2064883U - Relative brightness detector for fluorescent powder

Info

Publication number: CN2064883U
Application number: CN 90200628
Authority: CN
Inventors: 李呈华; 张大庆
Original assignee: Individual
Current assignee: Individual
Priority date: 1990-01-13
Filing date: 1990-01-13
Publication date: 1990-10-31

Abstract

The utility model relates to an utilize optical means to carry out the device that detects to phosphor powder relative brightness. The existing luminance meter takes out fluorescence signals in a limited solid angle range, and has large random error and low precision. The device is characterized in that a hollow spherical photometric sphere with the inner wall coated with a diffuse reflection material is arranged between an excitation light source and a sample plate, a detected fluorescent powder sample is excited and then undergoes multiple diffuse reflections on the inner wall of the photometric sphere to form a uniform fluorescent signal, the uniform fluorescent signal is received by a detector, and the signal is processed and output. The utility model has simple structure, convenient use and high detection precision, and can be widely applied to the brightness detection of fluorescent powder in the production industry of lighting appliances and kinescope fluorescent screens.

Description

Relative brightness tester for phosphor

The utility model relates to and a kind ofly utilizes optical instrument, promptly utilizes ultraviolet light or electron beam as the tested luminescent material of excitaton source laser, especially fluorescent powder, carry out the device that relative brightness detects, be mainly used in ligthing paraphernalia and detect with the relative luminosity of teletron screen production field to fluorescent powder.

The test to the fluorescent powder relative brightness of existing public use, mainly (GB4071-83 GB4072-83) promptly utilizes two kinds of pick-up units of GB correspondence according to national standard.Its technology constitutes: 1, one and the have angle cylindrical barrel body of (being generally 45 °) of vertical direction, excitation source one uviol lamp is settled in upper end at cylindrical shell, after optical filter filters, excitation beam and vertical direction have angle and shine tested fluorescent powder sample, the excitated fluorescent powder sample is luminous, fluorescence in certain in vertical direction solid angle is surveyed by photoelectric cell, and photosignal is read by indicating instrument.2, electron-beam excitation source and fluorescent powder sample place in the vacuum tank of a sealing altogether.The electron-beam excitation source vertically acts on tested fluorescent powder sample, photoelectric cell and vertical electron beam form an angle (generally also being 45 °) be provided with, take out fluorescent powder and be subjected to the brightness signal that produces after the electron-beam excitation, read at indicating instrument then.Though the fluorescent powder pick-up unit excitaton source that above-mentioned two kinds of technology constitute is had any different, but the common weak point that exists is: because photoelectric cell only takes out the fluorescent powder sample at certain solid angle internal reflection fluorescence signal, and in fact tested fluorescent powder sample there are differences at aspects such as granularity, powder shape, specimen surface states, certainly will make the fluorescence that sends in the distribution of all directions, have difference, comprising: fluorescent brightness, fluorescence polarization degree, fluorescence spectrum etc.Therefore the fluorescence brightness signal that takes out in a solid angle has bigger randomness, can not embody the relative brightness value of tested fluorescent powder sample truly.And for example western river Thailand controls, flat wood is respected " light yh optical analysis " 1984.11.P52 of three works.Disclosed a kind of photofluorometer also is luminous by the tested fluorescent powder sample of excitation light source excites, takes out the fluorescent powder brightness signal by photodetector in one direction, and its weak point also is that randomness is big with aforesaid identical, and degree of accuracy is not high.

The purpose of this utility model just is to overcome above shortcomings in the prior art, and provides a kind of easy to use, the fluorescent powder relative brightness detector that measuring accuracy is high.

The purpose of this utility model realizes by following technological means.The utility model still adopts ultraviolet source or electron beam as excitaton source, tested fluorescent powder sample is placed in the platter, this platter is positioned under excitaton source vertical, the inwall that is provided with a hollow sphere between platter and excitaton source is coated with the luminosity ball of diffuse-reflective material, excitaton source excites tested fluorescent powder sample, after the repeatedly diffuse reflection of luminosity ball inwall, by the uniform fluorescence signal of brightness signal detector collection, by comparing the fluorescence signal value of tested sample and standard sample, draw the relative brightness value of tested fluorescent powder.

Description of drawings is as follows:

Fig. 1 is the utility model basic structure synoptic diagram.

Fig. 2 is the relative brightness detector structural representation that has light pipe.

Fig. 3 is the relative brightness detector structural representation of cathode ray as excitaton source.

Fig. 4 is the relative brightness detector structural representation with collector lens.

Fig. 5 is the relative brightness detector structural representation that has condenser mirror.

Fig. 6 is the utility model most preferred embodiment structural representation.

The utility model will be described in further detail in conjunction with the accompanying drawings.

The utility model relative brightness detector basic structure synoptic diagram as shown in Figure 1.Main composition is: excitation source 1, platter 2, luminosity ball 3, detector 4 and signal Processing and output unit 5.It is the ultraviolet light of 253.7nm or 365.0nm that excitation source 1 adopts wavelength, platter 2 place excitation source 1 under, and vertical with excitation beam.Between excitation source 1 and the platter 2 be a hollow and thin-walled sphere and inwall be coated with the luminosity ball 3 of diffuse-reflective material (as MgO, BaSO powder), the vertical direction two ends perforate that this luminosity ball 3 is crossed the center of circle, one hole connects with excitation source 1, a hole and platter 2 centerings.Tested fluorescent powder in the platter 2 excites through excitation source 1, after the repeatedly diffuse reflection through luminosity ball 3 inwalls, makes detector 4 receive the fluorescence signal of uniform a no polarization and converts electric signal to, by signal Processing and output unit 5 demonstrations or printing.The installation site and the accuracy of detection of detector 4 are influential, should avoid the direct irradiation or the reflection of excitation source or fluorescent powder sample, so in the present embodiment detector 4 is installed in the position vertical with excitation beam.Detector 4 among Fig. 1 and signal Processing and output unit 5 and photodetector of the prior art, no essential difference is so be not repeated.

The relative brightness detector that has light pipe as shown in Figure 2, different with basic structure shown in Figure 1 is: one section visible light thoroughly is housed, thoroughly the glass light pipe 6 of uv excitation light in the luminosity ball.Make uv excitation light shine sample, avoid ultraviolet direct projection to cause on spuious fluorescence or the direct irradiation detector 4 and cause stochastic error to the ball wall along light pipe.The diameter of light pipe 6 should adapt with excitation beam, that is to say that light pipe 6 should comprise excitation beam.The axis of light pipe 6 should be parallel with excitation beam simultaneously.

As shown in Figure 3 with the relative brightness detector of cathode ray as excitaton source.7 is the cathode-ray exciting source among Fig. 3, and 8 is deflection coil, and 9 is vacuum tank, considers that 7,8,9 are prior art, and its formation is not repeated.

As Fig. 4--the relative brightness detector that has collector lens or condenser mirror shown in Figure 5.The excitation signal that excitation source 1 produces is through the convergence of convergent component collector lens 10 or condenser mirror 11, the excitation signal of excitated fluorescent powder sample is concentrated, energy strengthens, and can avoid excitation signal to shine the ball wall and detector causes error.

As shown in Figure 6 be most preferred embodiment structural representation of the present utility model.Take all factors into consideration from job requirement and economy, in luminosity ball 3, adopt light pipe 6, make excitation beam pass through light pipe 6, excite the fluorescent powder sample in the platter.After being excited, the fluorescent powder sample directly reflexes to detector 4, on platter 2 and detector 4 both lines, a light trap 12 is set, light trap 12 areas size is suitable mutually with the area size of platter 2 and detector 4, and platter 2 can be divided into some lattice, and can rotate around the axis.So that can detect several fluorescent powder samples simultaneously, improve detection efficiency.

The advantage that the utility model compared with prior art has is obviously, in nonideality detects, because all can there be certain difference in surface state (such as factors such as temperature, humidity) and the polarization situation of the precision of fluorescent material, powder shape, sample, therefore the size of measuring fluorescence signal in certain solid angle scope is determined the relative brightness of fluorescent material, and obvious random error is bigger. After adopting the luminosity ball, the fluorescence that tested fluorescent material sends to the space all directions is all collected, and by the uniform fluorescence signal of detector 4 receptions, when light-emitting phosphor during with partial polarization, behind the mixed light through luminosity ball 3, also will become complete non-polarized light, the light-emitting phosphor situation in using with reality approaches, therefore the fluorescent material relative brightness that records is comparatively true, and random error is littler. Secondly the utility model is simple in structure, uses also easily, is easy to promote the use of.

Claims

1, a kind of fluorescent powder relative brightness detector, mainly include excitaton source (1), platter (2), signal Processing and output unit (5), it is characterized in that: between excitaton source (1) and platter (2), have a hollow sphere and inwall be coated with the luminosity ball (3) of diffuse-reflective material, excitaton source (1) excites tested fluorescent powder sample, after the repeatedly casual light of luminosity ball (3) inwall is penetrated, gather uniform fluorescence signal by the detector (4) of signal Processing and output unit (5).

2, detector as claimed in claim 1 is characterized in that: cross the centre of sphere and be vertically installed with light pipe (6) with excitaton source (1) parallel beam in luminosity ball (3).

3, detector as claimed in claim 1 is characterized in that: be provided with collective optics (7) in the excitaton source (1).

4, detector as claimed in claim 1 or 2 is characterized in that: be equipped with between platter (2) and detector (4) line and prevent that sample from directly reflexing to the light trap (12) on the detector 4.