SU1460624A1 - Apparatus for testing reflection photometers - Google Patents

Abstract

The invention relates to analytical instrumentation, namely, to the technique of calibration and calibration of reflective photometers, measuring the reflection coefficient of small surfaces. The device consists of a set of single open 6 and closed 7 light guides with a reflective surface on the output side of the light radiation from fiberglass, and a dual light guide 5, one branch of which is open on the exit side, and the other is made with a reflective surface. The simulated reflectance is determined by the number of fibers in an open fiber with a reflective surface. 5 il. with CO | Od O O) 1x9 J

Description

The invention relates to analytical instrumentation, namely, to the technique of verification and calibration of reflective photometers measuring the reflection coefficient of small surfaces.

The purpose of the invention is to improve the accuracy of verification of photometers when measuring the reflection coefficient of small surfaces.

Fig. 1 shows the device with the object to be measured; fig 2 is the same; with dual optical fibers; on and 4 is a single fiber in FIG. 5, a dual fiber.

A device for calibration of reflective photometers contains a source of radiation 1 I, a receiver 2 of radiation, a photometric ball 3, an object to be measured 4, a dual light guide 5, a light guide 6 with open ends, a light guide 7 with a reflection from one end surface 8 a

The single light guide 6 is open on both sides, intended to simulate a reflection coefficient of .0%, and is made of optical fibers housed in an enclosure.

A single light guide with a reflecting surface 8 is designed to simulate a reflection coefficient p of 100%, and is made of optical fibers housed in a housing.

The dual light guide 5 is intended to simulate the intermediate value of the reflection coefficient, which is in the range from 0 to 100 where p is the simulated reflection coefficient. A fiber is a combination of a single open fiber and a single fiber, made on one side with a reflective surface, and the fibers of the single fibers are evenly distributed over the irradiated surface.

In addition, the length of all fibers, both single and twin, is the same, the total number of fibers of individual fibers, both single and twin, is the same. This achieves the identity of the characteristics of all fibers. The days of simulating different reflection coefficients in individual fibers change the number of fibers, with the total number

fibers in a single fiber does not change.

For example, with a reflection coefficient of 0%, the fiber is designed as a continuous open fiber with a total number of fibers equal to 100,

With a ratio of 100%,

the light guide is made on one side with a reflective surface, with a total amount of fibers equal to 100,

At a reflection coefficient of 40%, the fiber is a combination of a single open fiber with a number of fibers m 60 and a single fiber made on one side with a reflecting surface with the number of fibers n 40, with

In this, the total number of fibers in the dual fiber is maintained

n + that 100,

In general, the number of fibers in a fiber can be any other than O,

The ratio of the number of fibers of the closed and open fibers is equal to

- g --J with n + m coAst, m 1 p

where n is the number of fibers in the closed

a light guide with a reflecting surface at one end; m is the number of fibers in the open fiber.

The operation of the device consider the example of a reflective photometer (Fig, 1 and 2),

The beam from the radiation source 1 (FIG. 2) through the photometric ball 3 and the hole enters the device. The beam energy in accordance with the number of fibers is n and that is distributed in the optical fibers 6 and 7. Energy, which falls into the light guide 7, reflects from the surface 8 and, returning to the photometric ball, falls on the receiver 2 times, and the energy, which passes into the light guide 6, leaves the fiber without obstacles and does not participate in the measurements,

I

In the case of verification of the photometer is not

range 0-100%, .a in another, narrower, the kit will be included, except for devices with intermediate. reflection coefficient values, and devices with reflection coefficients corresponding to the beginning and

3

end of the range, in this case u),

To eliminate the systematic error that may occur due to absorption in the fiber itself, the calibration and calibration device kit must, in addition to devices with predetermined reflection coefficients within the range of 0-100, contain devices with zero and 100% reflections. , When, in the case of a device with a zero reflection coefficient, and PFD, and in the case of a device with a 100% reflection coefficient

Instead of setting the device with a zero reflection coefficient instead of the measurement object and the photometer reading to zero, using the second method set the device with a 100% reflection coefficient instead of the measurement object; the photometer reading is set to 100 using an appropriate mechanism.

In the future, instead of the measurement object, devices are inserted with given reflection coefficients and the photometer is calibrated.

A device for verification of reflective photometers containing a radiation source, optical equivalents of the material being measured along the radiation path and a photodetector is characterized in that, in order to improve the calibration accuracy of 15 photometers when measuring the reflectance of small surfaces, optical equivalents are made in the form of single or dual fiber, and a single fiber is made with two open ends or with a reflecting from one end surface, and the dual fiber is made so that each dstavl an open set of single fiber and single fiber with one end with the reflecting surface interconnected open ends so that the two optical waveguides fibers uniformly

The device is made in the form of a composite distributed over the irradiated surface of single and double luminosities, with the ratio of

Dov gives the following benefits; any necessary reflection coefficient is realized by counting the number of fibers in one and the other fibers, and the accuracy of calibration and calibration is increased due to the high accuracy achieved by counting

n fibers in the fiber with a reflective surface to the number m of fibers with an open-end fiber equal to

at

35

p m

P 1-p

at t + n const.

where p is the simulated reflection coefficient.

fiber quantities, as well as stability due to the use of ESJCOKOCTS-mobile optical elements, which are optical fibers from optical

Volokono

Claims (1)

Formula inveni.ni A device for calibrating reflective photometers containing a radiation source, optical equivalents of the material being measured along the radiation path and a photodetector is characterized in that, in order to improve the accuracy of the verification of photometers when measuring the reflection coefficient of small surfaces, optical equivalents are made in the form of a single or dual light guide The single light guide is made with two open ends or with a reflecting surface from one end, and the dual light guide is made so that each it is a combination of a single open fiber and a single fiber with a reflecting surface at one end, interconnected open ends, so that the fibers of both fibers are uniform distributed over the irradiated surface, while the ratio of n fibers in the fiber with a reflective surface to the number m of fibers with an open-end fiber equal to at 35 p m P 1-p at t + n const. where p is the simulated reflection coefficient. Oj Fiz.