Gloss meter, as test glossiness of surface, applied to paint coatings, decorative materials, building materials, plastic materials, ceramic products, stone products, wood products, leather products, film paper, printing ink and so on many industries.
It’s very hard for the selection of the instrument, because of the many brands of gloss meters, domestic or import, large or small, expensive or cheap, and all have claimed that the test is accurate, easy to use, etc.. it is very difficult to select the right one.Let’s study it from the working principle , so may help you in the purchase of choice.
First of all, let’s study the principle of glossmeter
Under specified light source and the receiver angle, Glossiness means: the ratio =Reflected light flux in the specular direction of the sample /Reflected light flux in the specular direction of standard glossiness plate.
In the geometric angle of 60 degrees, and the refractive index is 1.567 of the polished black glass,Define the polished black glass's glossiness as 100GU(Glossiness Unit)
So glossiness measurement is comparison measure method that under the same conditions, with respect to the mirror standard glossiness plate, to test the samples. In the same condition, means the incidence angle is certain, and the default light source is stable, with prescribed conditions beam to irradiate sample (or the standard plate) Receive the reflected light beam in a specified condition in the specular direction.
We can see from the principle, glossiness need standard plate as a contrast test reference. If the standard plate is not accurate, It is not possible for other measurement data . standard plate is easy to be scratched and the influence of dust.Instrument in design, need to consider the standard plate to get a good protection.
Second, the linearity of the measurement data of the gloss meter.
From principle of gloss meter, we can infer that linearity of the instrument measurement data are important factors to evaluate the instrument is good or bad. If gloss standard plate is accurate, for example, the glossiness of the standard plate is 95.5. the measure data in the vicinity of 95.5 is accutate, but whether be accurate of the measure date that far from standard plate glossiness, it is required to measure linearity of the system is good enough to protect. The linearity of the instrument measuring system is a difficult problem in the design of the instrument.
then the amount of gloss in the vicinity of 95.5 of the material, the general measurement data is more accurate, but the measurement is far from the gloss of the standard plate material, measurement data is accurate, it is required to measure the linearity of the system is good enough to protect. The linearity of the instrument measuring system is a difficult problem in the design of the instrument.
Third, constant current source and temperature compensation
Both of the stability of light source and temperature compensation function, are important factors to evaluate the instrument stability. We know that while the different temperature of the light source and different power supply current situation, luminous efficiency is not the same. Therefore,for most of glossmeters, needed to use constant current source and temperature compensation circuit to ensure the stability of the light source. About sonstant current source, can be achieved on general glossmeters, just different accuracy. But about temperature compensation, just a few of the gloss instrument has the function.
LS192 Glossmeter successfully achieved functions both of constant current source and temperature compensation circuit to ensure the stability and good linearity,
Fourth: FAQs of LS192 glossmeter
1: Q: what’s power supply?
A:Lithium rechargeable battery 14500, one full charge, can be used continuously for more than 50 hours.
2: Q: Can be automatically calibrated?
A: Put the instrument into the base holder, Power on with automaticly calibration function.
3: Q: In automatic calibrating process, whether problems of the standard plate can be judged ?
A:Instrument has the function of self checking, self diagnosis, such as check out if the standard plate be defaced, be scratched.
4: Q:Whether the instrument test is accurate?
A:Each instrument can pass A-level standard of the national measurement standards, can directly compare data with BYK AG4446
5: Q: Is the glossmeter with error compensation function?
A: Yes, with function both of constant current source and temperature compensation circuit. For an instrument, light source stability is an important guarantee of the stability of measuring instrument.
6: Q: how to achieve the statistical functions of the instrument?
A:With LCD interface, directly intelligent statistical function and PC software statistics
7: Q:Whether the standard plate can be cleaned with the cloth?
A:No, the standard plate is the basis of the accuracy of the instrument, must use the enclosed special lens cloth to wipe clean.
8: Q:Is it necessary to calibrate the instrument before each measurement?
A:It’s unnecessary, the instrument has compensation function to ensure long-term stability.
9: Q: When the instrument is no in use, how to keep it?
A:Put into the "base holder ", that is, the protection of the standard plate, also to protect the optical lens from dust and scratches.