CN1042857C - Myriajoule/myriawatt level laser energy/power measuring equipment - Google Patents

Abstract

The invention provides a device for measuring 10,000-joule-level laser energy and 10,000-watt-level laser power and monitoring their waveforms. It consists of an inverted cone receiver (8), a cylindrical absorption cavity (6), a differential thermocouple (14), a photoelectric detection device (3), an electric heater (7), a water cooling channel (10) and the like. The water outlet (5), the water inlet (11), and the water return nozzle (12) on the sleeve sleeve (24) use the water outlet (16) and the water inlet (20) on the closed end face of the pipeline and the housing (2) respectively. ), the water return port (18) is connected. The differential thermocouple (14), the photoelectric detector (3), and the electric heater (7) use metal wires and the energy measurement port (22), the power measurement port (17) and the electric heater on the closed end face of the housing (2) respectively. The calibration port (21) is connected.

Description

Measuring device for 10,000-joule/10,000-watt laser energy

The invention relates to a device for measuring 10,000-joule laser energy and 10,000-watt laser power and monitoring its waveform.

At present, the commonly used laser energy meters at home and abroad can only measure the laser energy below 100 joules. The commonly used laser power meters can only measure the laser power below 100 watts. Measurements are performed on the instrument. Foreign special instruments for measuring high energy and high power density have small apertures (within 100mm), are not fully absorbing, cannot measure energy and power at the same time, and cannot perform absolute measurements.

The object of the present invention is to provide a total absorption absolute measuring device for detecting the energy power of a new type laser with a ten thousand joule and ten thousand watt long pulse.

The purpose of the present invention is to be completed according to the following design scheme, an inverted cone receiving body 8 and a cylindrical absorber 6 coaxially welded on the outside of the inverted cone receiving body 8 form an inverted cone cylindrical full absorption receiving cavity, The receiving chamber is surrounded by a sleeve 24 to form a water-cooling channel 10, and the front lining 4 and the rear lining 9 are respectively used at the open end of the cylindrical absorber 6 and the closed end of the sleeve 24 to make the whole receiving chamber and the housing The inner wall of 2 is insulated and supported. In order to withstand and measure high-energy and high-power strong lasers, an inverted cone receiver is used; in order to achieve full absorption and to measure laser beams larger than φ100mm, a 120-140mn cylindrical cavity structure is used; in order to simultaneously measure and display the measured The ten-thousand-joule-level absolute energy and ten-thousand-watt-level power of the beam and its waveform are detected by using differential calorimetry or temperature sensor detection design; in order to perform self-calibration to ensure measurement accuracy, the same accurate measurement as the measured laser pulse width is used The absolute calibration design is carried out on the electric energy; in order to have the function of running with a computer, the corresponding computer software and hardware are designed.

The invention has the advantages of being able to withstand and measure high-energy and high-power density (more than 1KJ/kW/cm ² ) strong laser beams and laser beams with a diameter of 120-140mm; it can not only measure and detect laser energy and power simultaneously Its waveform can be connected to a computer to run, can be independently displayed and printed, and has a self-calibration function; the measured laser energy value has nothing to do with the measured laser pulse width (ns-s level).

Because the invention solves the problem of measuring means required by the modern strong laser, it wins economic benefits. At the same time, the range of my country's laser energy measurement standard has been extended from 0.1kJ to 10kJ.

Description of drawings

Figure 1--The cross-sectional schematic diagram of the 10,000-joule/10,000-watt laser energy power measurement device.

Figure 2--is the right side view of Figure 1.

Fig. 3--is the left side view of Fig. 1.

The implementation of the present invention will be described below in conjunction with the accompanying drawings.

The inverted cone receiving body 8 made of aluminum or copper and ultra-finely processed is welded coaxially with the cylindrical absorbing chamber 6 made of the same material and processing method to form an inverted cone-cylindrical full absorbing receiving chamber , a sleeve 24 is placed outside the chamber, and the sleeve 24 is fixed on the disc protrusion on the cylindrical absorption chamber 6 with screws, and an insulating pad 13 is placed between the two, so that the entire chamber is thermally insulated from the outside world. state. Whole inverted cone-cylindrical full absorption receiving cavity is supported on the housing 2 inwall of the device with front and rear linings 4,9 made of heat insulating material, and housing 2 is then supported with front and rear brackets 23,19.

The opening end of the cylindrical absorber 6 is black-plated, and there is a hole in the upper part, and a photodetector 3 is placed opposite the hole, and a hundred pairs of differential thermocouples 14 are evenly placed on the outer wall of the column, and their cold ends are placed on the column. On the heat sink 15 of the outer wall, the hot end is placed on the root of the disc-shaped protrusion. An electric heater 7 is wound around the outer wall of a section of the welded portion of the cylindrical absorber 6 and the inverted cone receiver 8 . The photodetector 3 , the differential thermocouple 14 , and the electric heater 7 are connected with the power measurement port 17 , the energy measurement port 22 and the electrical calibration port 21 on the closed end surface of the casing 2 by wires. A water outlet 5 is arranged above the open end of the sleeve sleeve 24, and a water inlet 11 and a water return 12 are arranged below, and the water outlet 16, the water inlet 20 and the water return 18 on the closed end face of the housing 2 are connected with the pipeline.

Claims (3)

1. Myriajoule/myriawatt level laser energy/power measuring equipment, it is characterized by by back taper and receive body (8) and coaxial welding outside it, bore is the cylindricality absorber (6) of 140mm, form back taper one cylindricality hypersorption reception cavity, this reception cavity surrounded a jacket casing (24), form water-cooling channel (10), on the cylindricality absorber corresponding a disk is housed with the jacket casing openend, mat insulation (13) is housed between jacket casing openend and disk, be with housing (2) in the jacket casing outside, in housing left side central authorities are laser beam inlets (1), on the housing right side, have water delivering orifice (16), water return outlet (18), water inlet (20), power measurement port (17), energy measurement port (22), electricity is proofreaied and correct port (21), in before between cylindricality absorber openend and shell, being with village (4), between the blind end of jacket casing and shell, be with rear inner lining (9), one faucet (5) is arranged above the jacket casing openend, there are water inlet tap (11) and backwater mouth (12) in the below, faucet (5) and water delivering orifice (16), water inlet tap (11) and water inlet (20), backwater mouth (12) is all connected with pipeline with water return outlet (18), above cylindricality absorber inlet end, a perforate is arranged, in the perforate outside photodetector (3) is installed, photodetector (3) has lead to be connected with power measurement port (17), in cylindricality absorber inlet end exterior circumferential 100 pairs of poor formula thermocouples (14) are installed evenly, their cold junction links to each other with heat sink (15), the hot junction links to each other with the outstanding root of cylindricality absorber disk, difference formula thermopair (14) has lead to be connected with energy measurement port (22), uniform winding electrical heating wire (7) on the linkage section outside surface of cylindricality absorber and back taper reception body, electrical heating wire (7) is proofreaied and correct port (21) with electricity has lead to be connected, be provided with fore-stock (23) in the openend bottom of housing, be provided with after-poppet (19) in housings close end bottom.

2. Myriajoule/myriawatt level laser energy/power measuring equipment according to claim 1, it is characterized by described back taper reception body (8) is made of aluminum or copper, surface gold-plating or oxidation processes, male cone (strobilus masculinus) is hyperfine polished surface, described cylindricality absorber (6) is made of aluminum or copper, inlet end inwall black coating, remaining surface are hyperfine polished surface.

3. Myriajoule/myriawatt level laser energy/power measuring equipment according to claim 1 and 2 is characterized by and has the computing machine special purpose interface.

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