CN114608700A - Laser energy measuring device and method based on quantitative water direct absorption - Google Patents
Laser energy measuring device and method based on quantitative water direct absorption Download PDFInfo
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Abstract
The invention provides a laser energy measuring device and method based on quantitative water direct absorption, and aims to solve the technical problems that a high-energy laser energy measuring device in the prior art is large in system, complex in device and high in measurement uncertainty. The invention provides a laser energy measuring device based on quantitative water direct absorption, which comprises a sealed cavity, heat absorption medium water, a first temperature sensor and a pressure sensor, wherein the sealed cavity is filled with the heat absorption medium water; the periphery of the sealed cavity is provided with an outer wall, the laser light-receiving surface of the sealed cavity is provided with a glass window, and the end surfaces of the outer wall and the glass window are sealed and enclosed to form a sealed cavity; the heat absorption medium water and a stirrer connected with an external motor are arranged in the sealed cavity; and heat insulation layers are arranged on the inner side and the outer side of the outer wall. According to the measuring method provided by the invention, the heat absorption medium water in the sealed cavity is used as a laser absorption medium, and the total energy of incident laser is obtained by utilizing the temperature difference between the highest temperature and the initial temperature of the heat absorption medium water.
Description
Technical Field
The invention relates to a high-energy laser energy measuring device, in particular to a laser energy measuring device based on quantitative direct water absorption and a measuring method thereof.
Background
In recent years, lasers are widely applied in scientific research, industrial production and other fields, and energy measurement of the lasers cannot be avoided in the production, development and application processes of the lasers. However, accurate laser energy measurement is difficult.
At present, there is a lot of work to make extensive studies on laser energy measurement. Typical laser energy measurement methods include three types: the passive absorption method utilizes pure solid such as metal or graphite as an absorber, and obtains laser energy by measuring the temperature rise of the absorber. The method is simple in structure, involves few physical processes, is a measuring method with high precision, but the laser damage resistance threshold of the absorption cavity is low, and is only suitable for laser measurement with low power density. And secondly, an active cooling method, firstly, a solid absorber is adopted to absorb laser, then, the absorber is cooled by circulating water, and finally, the temperature rise of the circulating water before and after entering the absorber is measured to obtain laser energy. And thirdly, a flowing water direct absorption method, wherein laser irradiates into water through a glass window of an absorption cavity, the water needs to flow rapidly for long-time measurement and reduction of water vaporization, and laser energy is obtained by measuring the temperature difference of inlet and outlet water. The active cooling method and the flowing water direct absorption method obviously improve the measurement power and the energy upper limit of the system, but the measurement devices of the two methods are complex, the involved physical processes are more, in addition, in order to calculate the laser energy, the mass flow and the temperature rise of water need to be measured, the larger water flow involved in the two methods needs to be measured by adopting a volume flow meter, and the phase change of the water possibly occurs in the measurement process, so the mass flow measurement error of the water is larger, and the uncertainty of the system measurement is higher.
Disclosure of Invention
The invention aims to solve the technical problems of large system, complex device and high measurement uncertainty of a high-energy laser energy measuring device in the prior art, and provides a laser energy measuring device and method based on quantitative water direct absorption.
In order to solve the technical problems, the technical solution provided by the invention is as follows:
a laser energy measuring device based on quantitative water direct absorption is characterized in that: the heat absorption device comprises a sealed cavity, heat absorption medium water, a first temperature sensor and a pressure sensor;
the periphery of the sealed cavity is provided with an outer wall, the laser light-facing surface of the sealed cavity is provided with a glass window, and laser light enters the sealed cavity through the glass window; the outer wall and the end face of the glass window are sealed and enclosed to form the sealed cavity;
the heat absorption medium water and the stirrer connected with the external motor are arranged in the sealed cavity, and the stirrer is driven by the motor to rotate, so that the heat balance of the heat absorption medium water is accelerated, and the water temperature in the cavity is uniform; the top of the water tank is provided with a pressurizing exhaust port for increasing pressure in the cavity or exhausting gas during water injection, and one side close to the bottom is provided with a water injection and drainage port; a first high-pressure valve is arranged on the pressurizing exhaust port, and a second high-pressure valve is arranged on the water injection and drainage port;
the first temperature sensor and the pressure sensor are arranged on the outer wall, the measuring parts of the first temperature sensor and the pressure sensor are both positioned in the sealed cavity, the first temperature sensor is used for measuring the temperature of water in the sealed cavity, the pressure sensor is used for monitoring the pressure in the sealed cavity, and preferably, the pressure sensor adopts a quick response pressure sensor;
and the inner side and the outer side of the outer wall are both provided with heat insulation layers for increasing the thermal resistance between the heat absorption medium water and the outer wall and between the outer wall and the environment and reducing the heat loss of the heat absorption medium water.
Further, the outer wall is provided with a second temperature sensor with a measuring part positioned inside the outer wall, the second temperature sensor is used for monitoring the temperature of the outer wall, the temperature can be used for correcting and compensating the measuring result, and therefore the uncertainty of measurement is improved, and the first temperature sensor and the second temperature sensor can adopt a thermistor type or thermocouple type sensor.
Further, the outer wall is provided with a plurality of second temperature sensors with measuring parts positioned inside the outer wall at different positions.
Further, the pressure resistance of the sealing cavity is not lower than 1 MPa.
Further, the depth of the sealed cavity is d, the depth of the sealed cavity is determined by the transmission distance of the laser to be detected in water, the transmission distance x of the laser in water can be obtained according to the beer lambert law, and the specific formula is as follows:
x＝-ln(T)/α
wherein T represents transmittance, and α represents absorption coefficient; when the transmittance T is 0.99, the depth d of the sealed cavity is determined by a calculated value which is greater than the transmission distance x of the laser in water.
Further, the volume calculation method of the sealed cavity comprises the following steps
Wherein V is the volume of the sealed cavity, Q is the total energy of the incident laser, cpThe specific heat capacity at constant pressure of the heat absorption medium water is shown, rho is the density of the heat absorption medium water, and delta T is the temperature rise of the heat absorption medium water.
Further, the volume of the heat absorption medium water is slightly smaller than that of the sealed cavity and is 95-99% of that of the sealed cavity.
Further, the heat insulation layer is made of waterproof heat insulation sponge adhesive tape.
Meanwhile, the invention also provides a laser energy measuring method based on quantitative water direct absorption, which is characterized by comprising the following steps:
1) firstly, opening a second high-pressure valve, adding heat absorption medium water into a sealed cavity through a water injection and drainage port, simultaneously opening a first high-pressure valve for exhausting when adding water, after the water is added to a set volume, closing the first high-pressure valve and the second high-pressure valve, recording the initial temperature of the heat absorption medium water in the sealed cavity through a first temperature sensor, and recording the initial pressure in the cavity through a pressure sensor;
2) irradiating laser to be detected into the sealed cavity through the glass window, transmitting the laser in the heat absorption medium water, continuously absorbing the laser by the heat absorption medium water, converting the laser into internal energy of the heat absorption medium water, and continuously stirring the laser by a stirrer to accelerate heat balance of water temperature; meanwhile, the pressure in the cavity is monitored through a pressure sensor, if the pressure rises sharply, the experiment is stopped, the volume of the heat absorption medium water is reduced, the experiment is carried out again, and if the pressure is stable, the experiment is continued;
3) after the laser stops, the temperature of the heat absorption medium water in the sealed cavity is continuously measured through the first temperature sensor, the maximum value of the water temperature is recorded, the difference between the maximum value of the temperature and the initial value is used as the temperature rise, and the laser power is calculated.
Further, in the step 1), after the heat absorption medium water is added into the sealed cavity, high-pressure gas is adopted to pressurize the sealed cavity through the first high-pressure valve, so that when the pressure in the sealed cavity is higher than the atmospheric pressure, the first high-pressure valve is closed.
Compared with the prior art, the invention has the beneficial effects that:
1. the laser energy measuring device based on quantitative direct water absorption provided by the invention adopts the heat absorption medium water in the sealed cavity as the laser absorption medium, obtains the total energy of the incident laser by measuring the temperature change of the heat absorption medium water, has the characteristic of high laser damage resistance threshold, is suitable for energy measurement of high-energy laser, and has smaller volume of the absorber compared with a device of a passive absorption method, so that a measuring system is smaller.
2. Compared with devices adopting an active cooling method and a flowing water type direct absorption method, the laser energy measuring device based on quantitative water direct absorption provided by the invention has the advantages that a measuring system is simpler, uncertainty sources are fewer, and the precision of laser energy measurement is ensured.
3. The laser energy measuring device based on quantitative water direct absorption provided by the invention is easy to insulate heat from the outside, can obviously reduce heat loss, and can obtain incident laser energy with higher accuracy through the temperature rise of heat absorption medium water.
4. According to the laser energy measuring device based on quantitative water direct absorption, the inner side and the outer side of the outer wall are respectively provided with the heat insulation layer made of the waterproof heat insulation sponge adhesive tape, the heat conductivity of the heat insulation sponge adhesive tape is far smaller than that of stainless steel, the heat resistance between heat absorption medium water and the sealed cavity can be remarkably increased, the temperature of the outer wall is recorded by the second temperature sensor arranged on the outer wall, and therefore the heat conducted by the heat absorption medium water to the outer wall is obtained, and the device can be used for correcting results.
5. According to the laser energy measuring device based on quantitative water direct absorption, the plurality of second temperature sensors with measuring parts positioned inside the outer wall are arranged at different positions of the outer wall of the sealed cavity, the multi-directional temperature rise of the outer wall is measured in real time, the energy transmitted to the outer wall through the heat absorption medium water is obtained through mass calculation, and the measurement result is compensated.
6. The invention provides a laser power energy measuring method based on quantitative water. Compared with an active cooling method and a flowing water direct absorption method, the quality of the heat absorption medium water in the sealed cavity is not changed before and after measurement, and the measurement can be accurately performed, so that the problem of high measurement uncertainty of a laser energy measuring device is solved, and the high-precision measurement of the laser energy can be realized.
7. According to the laser energy measuring method based on quantitative water direct absorption, in the step 1), high-pressure gas is adopted to pressurize the sealed cavity, so that bubbles can be greatly reduced, the influence of local vaporization of water on measurement is reduced, and the measurement precision is improved.
8. According to the laser energy measuring method based on quantitative direct water absorption, in the step 2), the heat absorption medium water is continuously stirred by the stirrer, so that the heat balance of the water temperature is accelerated, and the measuring precision is improved.
Drawings
FIG. 1 is a schematic structural diagram of an embodiment of a laser energy measuring device based on quantitative direct water absorption according to the present invention;
FIG. 2 is a graph showing temperature rise curves obtained under different laser energies according to an embodiment of the present invention;
the reference numerals are explained below:
1-outer wall; 2-a glass window; 3-heat absorbing medium water; 4-a first temperature sensor; 5-a pressure sensor; 6-a second temperature sensor; 7-a pressurized vent; 8-a first high pressure valve; 9-a heat insulation layer; 10-a stirrer; 11-a second high pressure valve; 12-Water injection and drainage port.
Detailed Description
To further clarify the advantages and features of the present invention, a more particular description of the invention will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings.
As shown in fig. 1, a laser energy measuring device based on quantitative direct water absorption comprises a sealed cavity, heat absorption medium water 3, a first temperature sensor 4, a second temperature sensor 6 and a pressure sensor 5; the periphery of the sealed cavity is provided with an outer wall 1, the laser light-receiving surface of the sealed cavity is provided with a glass window 2, the outer wall 1 and the glass window 2 are sealed by using a sealing gasket to form a high-pressure-resistant sealed cavity together in a surrounding manner. Preferably, the pressure resistance of the sealed cavity is not lower than 1MPa, the outer wall 1 is made of stainless steel with low heat conductivity and strong pressure resistance, and the glass window 2 is made of quartz glass with low laser absorption coefficient.
A certain amount of heat absorbing medium water 3 and a stirrer 10 connected with an external motor are arranged in the sealed cavity. The invention utilizes the temperature change of the quantitative heat absorption medium water 3 to finally obtain the incident laser energy, the stirrer 10 is made of plastic materials, the heat conduction coefficient is reduced as much as possible, the stirrer is connected with an external motor in a sealing transmission mode, and the stirrer 10 drives the heat absorption medium water 3 in the stirring cavity through the external motor to ensure that the water temperature in the cavity is uniform, thereby effectively accelerating the heat balance of the heat absorption medium water 3. The top of the sealed cavity is provided with a pressurizing exhaust port 7 for exhausting gas in the process of increasing pressure or injecting water into the cavity, one side of the sealed cavity close to the bottom is provided with a water injection outlet 12, the pressurizing exhaust port 7 is provided with a first high-pressure valve 8, the water injection outlet 12 is provided with a second high-pressure valve 11, and the first high-pressure valve 8 and the second high-pressure valve 11 are respectively used for controlling the closing and the opening of the pressurizing exhaust port 7 and the water injection outlet 12. The first temperature sensor 4 and the pressure sensor 5 are respectively fixed on the top of the outer wall 1, and the measuring parts of the first temperature sensor and the pressure sensor are both positioned in the sealed cavity. The first temperature sensor 4 is used for monitoring the temperature of the heat absorption medium water 3 in the sealed cavity, and the temperature measuring range is 0-100 ℃; the pressure sensor 5 is used for monitoring the pressure in the cavity, and the measuring range of the pressure sensor is 0.1-1 MPa. The second temperature sensor 6 is installed on the top of the outer wall 1, and the measuring part of the second temperature sensor is located inside the outer wall 1 and used for monitoring the temperature of the outer wall 1, and the temperature can be used for correcting and compensating the measuring result, so that the measuring precision is improved. The first temperature sensor 4 and the second temperature sensor 6 may employ a thermistor type or a thermocouple type sensor. In order to avoid the heat energy loss of the heat absorption medium water 3, the inner side and the outer side of the outer wall 1 are both provided with the heat insulation layer 9, the heat insulation layer 9 adopts a waterproof heat insulation sponge adhesive tape for increasing the heat resistance between the heat absorption medium water 3 and the outer wall 1 and between the outer wall 1 and the environment, although the method can not completely insulate the heat absorption medium water 3 and the external environment, the heat loss of the heat absorption medium water 3 to the external environment can be greatly reduced, and the method is approximate to heat insulation within a few seconds.
The volume of the sealed cavity is designed according to the total energy of the laser to be measured, and the calculation method comprises the following steps:
in the above formula, V is the volume of the sealed cavity, and Q is the incident laserTotal energy, cpThe specific heat capacity at constant pressure of the heat absorbing medium water 3, ρ is the density of the heat absorbing medium water 3, and Δ T is the temperature rise of the heat absorbing medium water 3.
In order to achieve a better measuring effect, the volume of the heat absorption medium water 3 in the sealed cavity is slightly smaller than that of the sealed cavity, the volume of the heat absorption medium water 3 is 95-99% of that of the sealed cavity, and according to temperature rise estimation, when the sealed cavity is not overfilled with water, the pressure in the cavity is ensured to rise sharply under the action of laser.
The depth of the sealed cavity is d, the depth is determined by the transmission distance of the laser to be detected in water, the transmission distance x of the laser to be detected in water can be obtained according to the beer Lambert law, and the specific formula is as follows:
x＝-ln(T)/α
wherein T represents transmittance, and α represents absorption coefficient; when the transmittance T is 0.99, the depth d of the sealed cavity is determined by a calculated value larger than the transmission distance x of the laser in water, and for the laser of about 1 micron, the transmission distance x of the laser in water is about 10cm, and the depth d of the sealed cavity can be 20 cm.
The invention also provides a laser energy measuring method based on quantitative water direct absorption, which comprises the following specific steps:
1) firstly, opening a second high-pressure valve 11, adding heat absorption medium water 3 into a sealed cavity through a water injection and drainage port 12, simultaneously opening a first high-pressure valve 8 for exhausting when adding water, closing the second high-pressure valve 11 after adding the water to a set volume, pressurizing the inside of the sealed cavity by adopting high-pressure gas through the first high-pressure valve 8 so that the pressure in the sealed cavity reaches 0.2Mpa, then closing the first high-pressure valve 8, recording the initial temperature of the heat absorption medium water 3 in the sealed cavity through a first temperature sensor 4, and recording the initial pressure in the cavity through a pressure sensor 5;
2) the laser to be measured is irradiated into the sealed cavity through the glass window 2, is spread in the heat absorption medium water 3, is continuously absorbed by the heat absorption medium water 3, is converted into the internal energy of the heat absorption medium water 3, and is continuously stirred through the stirrer 10, so that the heat balance of the water temperature is accelerated; meanwhile, the pressure in the cavity is monitored through the pressure sensor 5, if the pressure rises sharply, the experiment is stopped, the volume of the heat absorption medium water 3 is reduced, the experiment is carried out again, and if the pressure is stable, the experiment is continued;
3) after the laser stops, the temperature of the heat absorption medium water 3 in the sealed cavity is continuously measured through the first temperature sensor 4, the maximum value of the water temperature is recorded, the difference between the maximum value of the temperature and the initial value is used as the temperature rise, and the laser power is calculated.
In step 1), the purpose of pressurizing the inside of the sealed cavity is to enable the heat absorbing medium water 3 to uniformly absorb the incident laser. Test results show that when laser is incident into water under normal pressure, a large amount of bubbles are generated inside the heat absorption medium water 3 due to local vaporization, the bubbles can affect the absorption of the heat absorption medium water 3 on the laser, and even if the temperature of the stirring water passing through the stirrer 10 fluctuates, the output value of the first temperature sensor 4 contains ripple signals, and the measurement accuracy is further affected; and through pressurizing in the sealed cavity, can reduce the production of bubble greatly, reduce the influence of heat absorption medium water 3 local vaporization to measuring, improve measurement accuracy.
In order to ensure the measurement accuracy, the heat loss in three aspects existing in the measurement system, namely the heat conduction of the heat absorbing medium water 3 to the outer wall 1 of the sealed cavity, the heat conduction of the heat absorbing medium water 3 to the glass window 2 and the radiation heat exchange of the heat absorbing medium water 3 to the space through the glass window 2, need to be considered.
In order to reduce heat loss, the invention provides measures in three aspects, firstly, a heat insulation layer 9 adopting a waterproof heat insulation sponge adhesive tape is adhered on the inner surface and the outer surface of the outer wall 1, the heat conductivity of the waterproof heat insulation sponge adhesive tape is far less than that of stainless steel, and the heat resistance between the heat absorption medium water 3 and the outer wall 1 can be obviously increased; the temperature of the outer wall 1 itself is recorded by the second temperature sensor 6 provided in the outer wall 1, so that the amount of heat conducted from the heat absorbing medium water 3 to the outer wall 1 is obtained and can be used for correcting the result. Secondly, the glass window 2 is made of quartz glass with a low laser absorption coefficient, and the thermal conductivity of the glass is far lower than that of stainless steel, so that the heat absorption medium water 3 has small heat conduction loss to the glass window 2. Thirdly, the temperature rise of the heat absorption medium water 3 is controlled within 20 ℃ through the estimated total laser energy and the mass of the heat absorption medium water 3, and the radiation heat exchange of the heat absorption medium water 3 to the space through the glass window 2 is small due to the fact that the temperature rise of the heat absorption medium water 3 is not high. Finally, the total energy of the incident laser can be obtained by utilizing the temperature difference between the highest temperature and the initial temperature of the heat absorption medium water 3 in the sealed cavity.
Aiming at the laser to be measured with the energy range of 1-120 kJ, a measuring device is designed and processed for experimental research. Experiments show that after laser stops, the heat absorption medium water can reach the maximum temperature after 3 seconds, and can be kept unchanged within seconds, which indicates that the overall heat loss of the system is small, and the waterproof heat insulation layer plays a critical role. The maximum value of the temperature rise signal at this time is recorded and compared with the incident laser energy, and the relationship between different laser energies and temperature rise is obtained as shown in fig. 2, and the result shows that the temperature rise linearly increases with the increase of the laser energy, which indicates that the energy value of the laser can be obtained by measuring the temperature of the heat absorption medium water 3. Since the heat loss of the measuring system is small and the mass of the heat absorbing medium water 3 does not change before and after the measurement, the overall measurement uncertainty of the measuring method is greatly reduced.
In order to further improve the measurement accuracy, referring to fig. 1, a plurality of second temperature sensors 6 can be installed on the outer wall 1, the temperature rise of the outer wall 1 in multiple directions is measured in real time, the energy transmitted to the outer wall 1 through the heat absorption medium water 3 is obtained through mass calculation, and the measurement result is compensated. In addition, under the ideal condition that the heat absorption medium water 3 in the sealed cavity is completely insulated, the laser energy can be obtained by utilizing the temperature rise of the heat absorption medium water 3. However, because of inevitable heat loss, the calibration is carried out by adopting a laser or electric heating mode before measurement so as to improve the accuracy of measurement.
The above description is only for the purpose of illustrating the technical solutions of the present invention and not for the purpose of limiting the same, and it will be apparent to those skilled in the art that modifications may be made to the specific technical solutions described in the above embodiments or equivalent substitutions for some technical features, and these modifications or substitutions may not make the essence of the corresponding technical solutions depart from the scope of the technical solutions protected by the present invention.
Claims (10)
1. The utility model provides a laser energy measuring device based on quantitative water direct absorption which characterized in that: comprises a sealed cavity, heat absorption medium water (3), a first temperature sensor (4) and a pressure sensor (5);
the periphery of the sealed cavity is an outer wall (1), and a laser light-receiving surface of the sealed cavity is provided with a glass window (2); the end surfaces of the outer wall (1) and the glass window (2) are sealed and enclosed to form the sealed cavity;
a heat absorption medium water (3) and a stirrer (10) connected with an external motor are arranged in the sealed cavity; the top of the water tank is provided with a pressurizing exhaust port (7), and one side close to the bottom is provided with a water injection and drainage port (12);
a first high-pressure valve (8) is arranged on the pressurizing exhaust port (7), and a second high-pressure valve (11) is arranged on the water injection and drainage port (12);
the first temperature sensor (4) and the pressure sensor (5) are arranged on the outer wall (1), and measuring parts of the first temperature sensor and the pressure sensor are positioned in the sealed cavity;
and the inner side and the outer side of the outer wall (1) are both provided with a heat insulation layer (9).
2. The laser energy measuring device based on quantitative direct water absorption of claim 1, wherein: and a second temperature sensor (6) with a measuring part positioned inside the outer wall (1) is arranged on the outer wall (1).
3. The laser energy measuring device based on quantitative direct water absorption of claim 2, wherein: the outer wall (1) is provided with a plurality of second temperature sensors (6) with measuring parts positioned in the outer wall (1) at different positions.
4. The laser energy measuring device based on quantitative direct water absorption of claim 3, wherein: the pressure resistance of the sealing cavity is not lower than 1 MPa.
5. The device for measuring laser energy based on quantitative direct water absorption according to any one of claims 1 to 4, wherein the depth of the sealed cavity is d, the depth of the sealed cavity is determined by the transmission distance of the laser to be measured in water, and the transmission distance x of the laser in water can be obtained according to beer Lambert's law, and the specific formula is as follows:
x＝-ln(T)/α
wherein T represents transmittance, and α represents absorption coefficient; when the transmittance T is 0.99, the depth d of the sealed cavity is determined by a calculated value which is greater than the transmission distance x of the laser in water.
6. The device for measuring laser energy based on quantitative direct water absorption according to claim 5, wherein the volume of the sealed cavity is as follows:
wherein V is the volume of the sealed cavity, Q is the total energy of the incident laser, cpIs the specific heat capacity at constant pressure of the heat absorbing medium water (3), rho is the density of the heat absorbing medium water (3), and delta T is the temperature rise of the heat absorbing medium water (3).
7. The laser energy measuring device based on quantitative direct water absorption of claim 6, wherein: the volume of the heat absorption medium water (3) is 95-99% of the volume of the sealed cavity.
8. The laser energy measuring device based on quantitative direct water absorption of claim 7, wherein: the heat insulation layer (9) is made of waterproof heat insulation sponge adhesive tape.
9. A method for measuring laser energy based on quantitative water direct absorption, which is characterized in that the method for measuring laser energy based on quantitative water direct absorption according to any one of claims 1 to 8 comprises the following steps:
1) firstly, opening a second high-pressure valve (11), adding heat absorption medium water (3) into a sealed cavity through a water injection and drainage port (12), simultaneously opening a first high-pressure valve (8) for exhausting when adding water, closing the first high-pressure valve (8) and the second high-pressure valve (11) after adding water to a set volume, recording the initial temperature of the heat absorption medium water (3) in the sealed cavity through a first temperature sensor (4), and recording the initial pressure in the cavity through a pressure sensor (5);
2) irradiating laser to be detected into the sealed cavity through the glass window (2), transmitting the laser in the heat absorption medium water (3), continuously absorbing the laser by the heat absorption medium water (3), converting the laser into internal energy of the heat absorption medium water (3), and continuously stirring the laser by the stirrer (10) to accelerate the heat balance of water temperature; meanwhile, the pressure in the sealed cavity is monitored through the pressure sensor (5), if the pressure rises rapidly, the experiment is stopped, the volume of the heat absorption medium water (3) is reduced, the experiment is carried out again, and if the pressure is stable, the experiment is continued;
3) after the laser stops, the temperature of the heat absorption medium water (3) in the sealed cavity is continuously measured through the first temperature sensor (4), the maximum value of the water temperature is recorded, the difference between the maximum value of the temperature and the initial value is used as the temperature rise, and the laser power is calculated.
10. The laser energy measurement method based on quantitative water direct absorption of the claim 9, characterized in that, in the step 1), after the heat absorption medium water (3) is added into the sealed cavity, the sealed cavity is pressurized by high pressure gas through the first high pressure valve (8), and when the pressure in the sealed cavity is higher than the atmospheric pressure, the first high pressure valve (8) is closed.
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| CN202210189287.1A CN114608700B (en) | 2022-02-28 | 2022-02-28 | Laser energy measurement device and method based on quantitative water direct absorption |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2385280A1 (en) * | 2001-05-10 | 2002-11-10 | Bayer Aktiengesellschaft | Device and method for carrying out experiments in parallel |
| US20050123019A1 (en) * | 2003-12-03 | 2005-06-09 | Stewart Alan F. | Volume absorbing laser beam dump |
| CN103148948A (en) * | 2013-02-06 | 2013-06-12 | 西北核技术研究所 | Device for measuring high-energy laser energy |
| CN103398785A (en) * | 2013-07-26 | 2013-11-20 | 西北核技术研究所 | Rotary absorber-based high-energy laser energy measuring device |
| US20140087099A1 (en) * | 2012-09-27 | 2014-03-27 | Guardian Industries Corp. | Low temperature hermetic sealing via laser |
| CN209997616U (en) * | 2019-03-27 | 2020-01-31 | 华研环科(北京)科技有限公司 | style high-capacity stirring hydrothermal kettle |
| CN111448449A (en) * | 2017-02-16 | 2020-07-24 | Essenlix公司 | Assay using textured surfaces |
| US20200355605A1 (en) * | 2019-03-05 | 2020-11-12 | Optiscan Biomedical Corporation | Automated fluid analysis using tunable optical sources |
-
2022
- 2022-02-28 CN CN202210189287.1A patent/CN114608700B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2385280A1 (en) * | 2001-05-10 | 2002-11-10 | Bayer Aktiengesellschaft | Device and method for carrying out experiments in parallel |
| US20050123019A1 (en) * | 2003-12-03 | 2005-06-09 | Stewart Alan F. | Volume absorbing laser beam dump |
| US20140087099A1 (en) * | 2012-09-27 | 2014-03-27 | Guardian Industries Corp. | Low temperature hermetic sealing via laser |
| CN103148948A (en) * | 2013-02-06 | 2013-06-12 | 西北核技术研究所 | Device for measuring high-energy laser energy |
| CN103398785A (en) * | 2013-07-26 | 2013-11-20 | 西北核技术研究所 | Rotary absorber-based high-energy laser energy measuring device |
| CN111448449A (en) * | 2017-02-16 | 2020-07-24 | Essenlix公司 | Assay using textured surfaces |
| US20200355605A1 (en) * | 2019-03-05 | 2020-11-12 | Optiscan Biomedical Corporation | Automated fluid analysis using tunable optical sources |
| CN209997616U (en) * | 2019-03-27 | 2020-01-31 | 华研环科(北京)科技有限公司 | style high-capacity stirring hydrothermal kettle |
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