Device for measuring the absorption coefficient of the mirrors

 

(57) Abstract:

The inventive device includes a radiation source optically coupled through the mirror with absorbing cone, the cooling system of mirrors and cone with collectors entrance and exit of the refrigerant and the cooling channels, thermal sensors. Mirror and absorbing cone is further provided with nozzles placed in them by the sensors, made in the form megaspine thermocouple and oriented in the direction opposite to the movement of the refrigerant. The collectors of the entrance and exit of the refrigerant absorbing cone is placed on its back surface, and the cooling channels of the cone is made on the lateral and dorsal surfaces. The nozzles are connected to the collectors of the entrance and exit of the refrigerant absorbing cone and mirrors. 1 C.p. f-crystals, 2 Il.

The invention relates to quantum electrical engineering, in particular to a device for measuring the absorption coefficient used in devices for forming and transporting radiation cooled mirror at the working wavelength.

A device for measuring the absorption coefficient of the sample mirrors [1] including a radiation source, a sample mirror attached to it is of infrared radiation and subsequent similar heat from the heater.

The main disadvantages of the known device is its use for research only specially made uncooled samples of mirrors with integrated heaters and not real-cooled mirrors, and low accuracy.

The technical nature closest to the invention /prototype/ calorimeter is a device for measuring the absorption coefficient of the mirrors [2] containing a radiation source, an uncooled sample mirrors with built-in electric heater, a heat reservoir with coolant thermally stabilized liquid, teplovod placed between the sample and thermal reservoir temperature sensors-thermistors, absorbing the cone heater and the heat line. When heating the sample mirrors and absorbing cone of radiation energy using a thermistor measures the temperature difference on the heat line between the sample /cone/ and reservoir with coolant constant temperature, then the difference is reproduced using the built-in heater.

The main disadvantages of the device /2/ are able to move it in the laboratory for research only specially made of Pohl the ri unlimited time source and constant power radiation, great effect of heat losses on the measurement accuracy due to the fact that laser and electric heating spaced in time.

The objective of the invention is to improve the accuracy of measurement of the absorption coefficient are from service and used in devices for forming and transporting radiation cooled mirrors.

This technical result is achieved in that known device, containing a radiation source optically coupled through the mirror with absorbing cone cooling system mirrors and cone with collectors entrance and exit of the refrigerant and the cooling channels, the sensor is further provided with nozzles with pockets for the placement of sensors on the rear surface of the absorbing cone placed collectors entrance and exit of the refrigerant on the side and the back surface of the cone is made of the cooling channels, pipes with pockets for placement of temperature sensors attached to the reservoir inlet and outlet of the refrigerant absorbing cone and mirrors, and sensors installed in the nozzle and oriented in the direction the opposite movement of the refrigerant, and a pocket for placement of the sensor consists of fitting, hollow the second pipe end is rigidly connected with him, as the case with multilayer electrodes thermocouples placed inside the fitting.

In Fig. 1 illustrates schematically an apparatus for measuring the absorption coefficient of the mirrors of Fig. 2 pipe with a pocket for placement of the temperature sensor.

The device has cooled mirror 1, the nozzle 2 with pockets for the placement of sensors on the areas of the entrance of the refrigerant pipes with 3 pockets for placing sensors on the sections of the exit of the refrigerant, 4 pockets for placement of temperature sensors, thermal sensors /multilayer thermocouple/ 5, absorbing cone 6, collectors 7 logon refrigerant manifolds 8 output refrigerant, the cooling channels 9, the radiation source 10.

To the input and output flanges of the cooling system of the mirror 1, the absorption coefficient which must be measured, join the pipes 2 and 3 with 4 pockets for placement of temperature sensors 5. Absorbing cone 6 meter energy of the reflected radiation has on the back surface collector entrance and exit of the refrigerant 7 and 8 and the cooling channels 9, performed on the side and rear surfaces of a cone. To the flanges of the cooling system of the cone 6 and the mirror 1, join the pipes 2 and 3 with 4 pockets, thermodata in the flow of the refrigerant. Mirror 1 and the cone 6 are arranged so that the reflected mirror surface radiation source 10 falls on the working surface of the absorbing cone.

The pipe 2 with pocket for placement of thermal sensor includes a nozzle 11, a cover 12, a washer 13, a gasket 14, the nut 15.

The pipe 2 on the side has a through hole into which is inserted the nozzle 11 and is rigidly connected with the pipe /for example, welding/. Inside the fitting is placed a hollow case 12, representing curly metal tube with open ends and with special soldered onto the tube by a sealing washer 13. The strip 14 with a nut 15 provides a sealed input of the cover 12 to the inside of the pipe 2. The junctions of thermocouple 5 overlook a few millimeters towards the flow from the open end of the case 12, and the electrodes thermocouples are inside the case. To ensure the integrity of the internal cavity of the case with electrodes filled sealing resin.

The device operates as follows.

Absorbed by the reflecting surface of the mirror 1 of the energy of incident radiation source 10 is given by the refrigerant pumped through the cooling system of the mirror at a constant flow rate and constant temperature of judgjudgment input-output mirror 1. Reflected by the mirror 1, the fraction of energy absorbed by the working surface of the absorbing cone 6 and with the amount of refrigerant pumped through the cone 6 at a constant flow rate and constant temperature of the refrigerant at the exit. The temperature difference at the inlet-outlet of the cone is using megaspine thermocouple 5. It can be shown that the absorption coefficient of the mirror A/taking into account the heat flux interaction between the mirror 1 and the cone 6 with the environment/ is calculated by the formula

and in the case of a stationary mode at the same refrigerants in cooling systems mirrors and cone

< / BR>
GC,Gtothe flow of refrigerant through the mirror and cone, respectively;

the temperature drop of the refrigerant in the mirror and the cone under the action of radiation;

the temperature drop of the refrigerant in the mirror and the cone without load

time.

The use of the device special nozzles with pockets for placement of temperature sensors, providing a sealed input sensor /megaspine thermocouple directly in the flow of refrigerant to meet his movement, provides low inertia and high precision measurements of the temperature of the refrigerant and therefore pohlad the Noah surfaces, and the use of collectors in the cooling system promotes good mixing of the fluid and precise measurement of the bulk temperature of the fluid. Connection nozzles directly with collectors entrance and exit of the refrigerant reduces the mean free path of the refrigerant to the temperature sensors and, accordingly, the heat loss to the environment.

In addition to the above, a significant advantage of the proposed device before the device is /2/ that allows you to improve the accuracy of measurements of the absorption coefficient, is the absence of an electric heater providing the equivalent electrical heating after carrying out heat radiation. Measurement of the absorption coefficient /absorbed energy radiation/ performed by using the proposed device can be carried out in contrast to the prototype, for any a cooled mirror in operation. If the device /2/ required stability of the radiation power at a certain time of the radiation source, the proposed device does not impose any requirements on the stability of power in time of the radiation source, which significantly increases the accuracy of the measurement. Privlige is with, the error in the measurement of the absorption coefficient using the known device can reach 15-25% while using the proposed device 5-10%

1. Device for measuring the absorption coefficient of the mirrors containing a radiation source optically coupled through the mirror with absorbing cone, the cooling system of mirrors and cone with collectors entrance and exit of the refrigerant and the cooling channels, as well as sensors, characterized in that mirror and absorbing cone is further provided with nozzles placed in them by the sensors, which are made in the form of megaspine thermocouple and oriented in the direction opposite to the movement of the refrigerant, the reservoir inlet and outlet of the refrigerant absorbing cone is placed on its back surface, and the cooling channels of the cone is made on the lateral and rear surfaces, when this pipe is attached to the reservoir inlet and outlet of the refrigerant absorbing cone and mirrors.

2. The device under item 1, characterized in that each nozzle is equipped with a pocket consisting of a fitting and installed in it a hollow case, inside of which is placed a thermocouple, and a fitting mounted on the side wall of the Sabbath.

 

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