A temperature control device and experimental method for laser ablation-driven micro-impact measurement experiment

Abstract

This invention provides a temperature control device for laser ablation-driven micro-impulse measurement experiments, based on a torsion pendulum micro-impulse measurement system. The torsion pendulum micro-impulse measurement system includes a laser, a focusing lens, a displacement stage, a torsion pendulum, a displacement sensor, and a data processing system arranged sequentially. The temperature control device is located in front of the torsion pendulum and fixedly connected to the displacement stage. The temperature control device includes a low-temperature heat sink, an electric heating element, and a temperature control chip, wherein the low-temperature heat sink is shaped to not obstruct the optical path. This solution achieves temperature control of the driven sample in laser ablation-driven impulse measurement experiments without affecting the impulse measurement process of the original torsion pendulum system.

Description

Technical Field

[0001] This invention relates to the field of lasers, and in particular to a temperature control device and experimental method for laser ablation-driven micro-impulse measurement experiments. Background Technology

[0002] Laser ablation-driven technology has wide applications in laser propulsion, space debris removal, and hypersonic emission. Its application relies on research describing the impulse generation mechanism of laser-matter interaction. Currently, experimental research in this field mainly utilizes laser ablation-driven micro-impulse measurement systems. Existing measurement systems can only operate at room temperature. However, in the actual space environment, space debris varies within a range of ±200° due to solar radiation and its own rotation. Temperature affects the impulse coupling process, and current technologies cannot meet the requirements for measurement experiments under high and low temperature conditions. Summary of the Invention

[0003] To address the problems existing in the prior art, this invention provides a temperature control device and experimental method for laser ablation-driven micro-impulse measurement experiments. Based on a torsion pendulum micro-impulse measurement system, a low-temperature heat sink and an electric heating element are installed on the front side of the sample to raise and lower the temperature of the target plate. The temperature of the target plate is adjusted by the heating element in conjunction with the temperature control system.

[0004] To achieve the above objectives, the present invention adopts the following solution:

[0005] This invention provides a temperature control device for laser ablation-driven micro-impulse measurement experiments, based on a torsion pendulum micro-impulse measurement system. The torsion pendulum micro-impulse measurement system includes a laser, a focusing lens, a displacement stage, a torsion pendulum, a displacement sensor, and a data processing system arranged sequentially. The temperature control device is located in front of the torsion pendulum and is fixedly connected to the displacement stage. The temperature control device includes a low-temperature heat sink, an electric heating element, and a temperature control chip. The low-temperature heat sink is shaped to not obstruct the light path.

[0006] Furthermore, the torsion pendulum includes a torsion pendulum beam on which a sample base is mounted, and the laser spot emitted by the laser hits the center of the sample base. The temperature control device also includes a temperature control system mounted on the displacement stage and a support column mounted on the temperature control system. The low-temperature heat sink includes a liquid nitrogen storage tank mounted on the temperature control system and a heat sink pipe connected to the liquid nitrogen storage tank. The electric heating element and the temperature control chip are connected to the support column.

[0007] Furthermore, the heat sink pipe is an annular bend, with the inner position of the annulus matching the position of the laser spot and being larger than the laser spot.

[0008] Furthermore, the annular bend of the heat sink pipe has a diameter of 30mm and is positioned 2mm away from the sample base, allowing a laser with a maximum diameter of 25mm to pass through.

[0009] Furthermore, the temperature control chip is connected to the support column via a flexible metal wire and is positioned at both ends of the light spot position on the sample base, closely attached to but not fixedly connected to the sample base.

[0010] Furthermore, the electric heating element is connected to the support column via a flexible metal wire and is positioned at the four corners of the sample base, fitting snugly to the sample base but not fixedly connected.

[0011] Furthermore, the support is also equipped with a limiter to limit the forward swing during the torsional recovery process.

[0012] Furthermore, the outer end of the limiter is covered with a flexible material.

[0013] This invention also provides an experimental method for measuring laser ablation-driven micro-impulse, based on an experimental system including the above-mentioned temperature control device for measuring laser ablation-driven micro-impulse, specifically including the following steps:

[0014] S1: Low-temperature experiment:

[0015] 1) Adjust the laser and lens parameters and positions to ensure that the laser parameters meet the experimental requirements;

[0016] 2) Install the sample and sample base;

[0017] 3) Adjust the positions of the heating chip and temperature control chip according to the sample size and the light spot size, so that they are as close to the sample as possible;

[0018] 4) Adjust the distance between the displacement stage and the pendulum, and determine the contact between the displacement stage and the pendulum by reading the displacement sensor. When the displacement stage touches the pendulum, the reading of the displacement sensor will change, so that the displacement stage can be as close to the pendulum as possible without touching the pendulum.

[0019] 5) Open the liquid nitrogen valve to allow the sample temperature to begin to drop. Observe the temperature reading on the temperature control system. When the temperature is lower than the experimental temperature, activate the temperature control system to maintain the temperature near the experimental temperature.

[0020] 6) Start the laser and record the displacement data;

[0021] 7) After the torsion pendulum returns to its forward swing and is blocked by the limiter, the distance between the electric displacement stage and the torsion pendulum is adjusted by the electric displacement stage fine adjustment device, and the contact between the torsion pendulum and the torsion pendulum is determined by the displacement sensor reading, so that it is as close to the torsion pendulum as possible without contacting the torsion pendulum.

[0022] 8) Begin the next pulse-driven experiment;

[0023] S2: High-temperature experiment:

[0024] 1) Adjust the laser and lens parameters and positions to ensure that the laser parameters meet the experimental requirements;

[0025] 2) Install the sample and sample base;

[0026] 3) Adjust the positions of the heating chip and temperature control chip according to the sample size and the light spot size, so that they are as close to the sample as possible;

[0027] 4) Adjust the distance between the device and the pendulum using the displacement stage, and determine the contact between the device and the pendulum using the displacement sensor reading, so that the device can be as close to the pendulum as possible without touching it.

[0028] 5) Turn on the electric heating element to allow the sample temperature to rise. Observe the temperature reading on the temperature control system. When the temperature is close to but lower than the experimental temperature, start the temperature control to maintain the temperature near the experimental temperature.

[0029] 6) Start the laser and record the displacement data;

[0030] 7) After the torsion pendulum returns to its forward swing and is blocked by the limiter, the distance between the electric displacement stage and the torsion pendulum is adjusted by the electric displacement stage fine adjustment device, and the contact between the torsion pendulum and the torsion pendulum is determined by the displacement sensor reading, so that it is as close to the torsion pendulum as possible without contacting the torsion pendulum.

[0031] 8) Begin the next pulse-driven experiment.

[0032] Beneficial effects:

[0033] The temperature control device for laser ablation-driven micro-impulse measurement experiment provided by this invention realizes temperature regulation of the driving sample in laser ablation-driven impulse measurement experiment, with a temperature control range of -150℃ to 150℃, and does not affect the impulse measurement process of the original torsion pendulum system. Attached Figure Description

[0034] Figure 1 This is an overall top view of an embodiment of the present invention;

[0035] Figure 2 This is a front view of an embodiment of the present invention;

[0036] Figure 3 This is a partial side view of an embodiment of the present invention;

[0037] In the figure, 1-electric displacement stage, 2-temperature control system, 3-liquid nitrogen storage tank, 4-heat sink pipe, 5-temperature control chip, 6-sample base, 7-electric heating element, 8-maximum allowable spot range, 9-support column, 10-limiter, 11-torsion pendulum, 12-laser, 13-focusing lens, 14-displacement sensor, 15-data processing system. Detailed Implementation

[0038] To make the technical solutions and advantages of the present invention clearer, the technical solutions of the embodiments of the present invention will be fully described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0039] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0040] System overall design

[0041] like Figure 1 The image shown is a top view of the overall system: 1-10 are the high and low temperature control devices (see details). Figure 2 , 3 11 is a torsion pendulum, 12 is a laser, 13 is a focusing lens, 14 is a displacement sensor, and 15 is a data processing system. The high and low temperature control device is fixedly added to the torsion pendulum micro-impulse measurement system along with the displacement stage. This device controls the high and low temperatures of the sample front side through a heat sink, an electric heating chip, and a temperature control chip that do not obstruct the optical path. The torsion pendulum micro-impulse measurement system calculates the impulse by measuring the instantaneous displacement distance of the torsion pendulum after laser driving; therefore, its initial motion under laser driving must not be disturbed. All components of this device are located in front of the torsion pendulum, so they do not affect the initial backward swing of the torsion pendulum under laser driving, but they control its forward swing when the torsion pendulum returns to its original position.

[0042] Detailed design of high and low temperature control device

[0043] like Figure 2 , 3 The following diagram shows the specific design of the high and low temperature device and its relationship with the torsion pendulum: 1 is the electric displacement stage, 2 is the temperature control system, 3 is the liquid nitrogen storage tank, 4 is the heat sink pipe, 5 is the temperature control chip, 6 is the sample base, 7 is the electric heating element, 8 is the maximum allowable light spot range, 9 is the support column, 10 is the limiter, and 11 is the torsion pendulum.

[0044] The sample is fixed to a sample base. The sample base is painted black and fixed to the torsion beam with bolts or adhesive. The temperature control chip is connected to the support column via flexible metal wire and fixed at both ends of the sample base at the light spot position, in close contact with the sample base but not fixedly connected. The electric heating element is connected to the support column via flexible metal wire and fixed at the four corners of the sample base, in close contact with the sample base but not fixedly connected. The heat sink pipe has a 30mm diameter annular bend and is fixed at a distance of 2mm from the sample base, allowing a maximum laser diameter of 25mm to pass through. One end of the support column extends into a limiter wrapped with flexible material such as rubber sponge. The plane of the limiter is consistent with the plane of the temperature control chip and the electric heating element, used to limit the forward swing during the torsion recovery process. The temperature control system is connected to the electric heating chip and the temperature control chip via the support column and is fixed to the electric displacement stage.

[0045] Low temperature experiment process

[0046] 1) Adjust the laser and lens parameters and positions to ensure that the laser parameters meet the experimental requirements;

[0047] 2) Install the sample and sample base;

[0048] 3) Adjust the positions of the heating chip and temperature control chip according to the sample size and the light spot size, so that they are as close to the sample as possible;

[0049] 4) Adjust the distance between the displacement stage and the pendulum, and determine the contact between the displacement stage and the pendulum by reading the displacement sensor. When the displacement stage touches the pendulum, the reading of the displacement sensor will change, so that the displacement stage can be as close to the pendulum as possible without touching the pendulum.

[0050] 5) Open the liquid nitrogen valve to allow the sample temperature to begin to drop. Observe the temperature reading on the temperature control system. When the temperature is lower than the experimental temperature, activate the temperature control system to maintain the temperature near the experimental temperature.

[0051] 6) Start the laser and record the displacement data;

[0052] 7) After the torsion pendulum returns to its forward swing and is blocked by the limiter, the distance between the electric displacement stage and the torsion pendulum is adjusted by the electric displacement stage fine adjustment device, and the contact between the torsion pendulum and the torsion pendulum is determined by the displacement sensor reading, so that it is as close to the torsion pendulum as possible without contacting the torsion pendulum.

[0053] 8) Begin the next pulse-driven experiment.

[0054] High temperature experiment process

[0055] 1) Adjust the laser and lens parameters and positions to ensure that the laser parameters meet the experimental requirements;

[0056] 2) Install the sample and sample base;

[0057] 3) Adjust the positions of the heating chip and temperature control chip according to the sample size and the light spot size, so that they are as close to the sample as possible;

[0058] 4) Adjust the distance between the device and the pendulum using the displacement stage, and determine the contact between the device and the pendulum using the displacement sensor reading, so that the device can be as close to the pendulum as possible without touching it.

[0059] 5) Turn on the electric heating element to allow the sample temperature to rise. Observe the temperature reading on the temperature control system. When the temperature approaches but is lower than the experimental temperature, activate the temperature control. Based on the measurement data from the temperature control chip, reduce the power of the electric heating element or increase the liquid nitrogen flow rate when the temperature is higher than the set value, and increase the power of the electric heating element or decrease the liquid nitrogen flow rate when the temperature is lower than the set value. This feedback control maintains the temperature near the experimental temperature.

[0060] 6) Start the laser and record the displacement data;

[0061] 7) After the torsion pendulum returns to its forward swing and is blocked by the limiter, the distance between the electric displacement stage and the torsion pendulum is adjusted by the electric displacement stage fine adjustment device, and the contact between the torsion pendulum and the torsion pendulum is determined by the displacement sensor reading, so that it is as close to the torsion pendulum as possible without contacting the torsion pendulum.

[0062] 8) Begin the next pulse-driven experiment.

[0063] In the description of this specification, references to terms such as "an embodiment" and "example" refer to specific features, structures, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms are not necessarily intended to refer to corresponding embodiments or examples in a suitable manner.

[0064] It must be pointed out that the above description of the embodiments is not intended to limit the invention but only to help understand the core idea of ​​the invention. For those skilled in the art, any improvements to the invention and equivalent alternatives made to the invention without departing from the principle of the invention are also within the scope of protection of the claims of the invention.

Claims

1. A temperature control device for laser ablation-driven micro-impulse measurement experiments, based on a torsion pendulum micro-impulse measurement system, wherein the torsion pendulum micro-impulse measurement system comprises, in sequence, a laser, a focusing lens, a displacement stage, a torsion pendulum, a displacement sensor, and a data processing system, characterized in that, The temperature control device is located in front of the torsion swing and is fixedly connected to the displacement stage. The temperature control device includes a low-temperature heat sink, an electric heating element, and a temperature control chip. The low-temperature heat sink is shaped to not block the light path. The torsion pendulum includes a torsion pendulum beam on which a sample base is mounted. The laser beam emitted by the laser hits the center of the sample base. The temperature control device also includes a temperature control system mounted on the displacement stage and a support column mounted on the temperature control system. The low-temperature heat sink includes a liquid nitrogen storage tank mounted on the temperature control system and a heat sink pipe connected to the liquid nitrogen storage tank. The electric heating element and the temperature control chip are connected to the support column. The heat sink pipe is an annular bend, with the inner position of the annulus matching the position of the laser spot and being larger than the laser spot; The temperature control chip is connected to the support column via a flexible metal wire and is located at both ends of the light spot position on the sample base, and is in close contact with the sample base but not fixedly connected. The electric heating element is connected to the support column by a flexible metal wire and is positioned at the four corners of the sample base, fitting snugly to the sample base but not fixedly connected.

2. The temperature control device for laser ablation-driven micro-impulse measurement experiment according to claim 1, characterized in that, The heat sink pipe has an annular bend with a diameter of 30mm and is positioned 2mm away from the sample base, allowing a laser with a maximum diameter of 25mm to pass through.

3. The temperature control device for laser ablation-driven micro-impulse measurement experiment according to claim 1, characterized in that, The support column is also equipped with a limiter to limit the forward swing during the torsional recovery process.

4. The temperature control device for laser ablation-driven micro-impulse measurement experiment according to claim 3, characterized in that, The outer end of the limiter is covered with a flexible material.

5. A laser ablation-driven micro-impulse measurement experimental method, characterized in that, Based on the experimental temperature control device for laser ablation-driven micro-impact measurement as described in any one of claims 1-4 Includes the following steps: S1: Low-temperature experiment: 1) Adjust the laser and lens parameters and positions to ensure that the laser parameters meet the experimental requirements; 2) Install the sample and sample base; 3) Adjust the positions of the heating chip and temperature control chip according to the sample size and the light spot size, so that they are close to the sample; 4) Adjust the distance between the displacement stage and the pendulum, and determine the contact between the displacement stage and the pendulum by reading the displacement sensor. When the displacement stage touches the pendulum, the displacement sensor reading will change, so that the displacement stage can be close to the pendulum without touching it. 5) Open the liquid nitrogen valve to allow the sample temperature to drop. Observe the temperature reading on the temperature control system. When the temperature is lower than the experimental temperature, activate the temperature control system to maintain the temperature at the experimental temperature. 6) Start the laser and record the displacement data; 7) After the torsion pendulum returns to its forward swing and is blocked by the limiter, the distance between the electric displacement stage and the torsion pendulum is adjusted by the electric displacement stage fine adjustment device, and the contact between the torsion pendulum and the torsion pendulum is determined by the displacement sensor reading, so that it is close to the torsion pendulum without contacting the torsion pendulum. 8) Begin the next pulse-driven experiment; S2: High-temperature experiment: 1) Adjust the laser and lens parameters and positions to ensure that the laser parameters meet the experimental requirements; 2) Install the sample and sample base; 3) Adjust the positions of the heating chip and temperature control chip according to the sample size and the light spot size, so that they are close to the sample; 4) Adjust the distance between the device and the pendulum using the displacement stage, and determine the contact between the device and the pendulum using the displacement sensor reading, so that the device can be close to the pendulum without touching it. 5) Turn on the electric heating element to allow the sample temperature to rise. Observe the temperature reading on the temperature control system. When the temperature is lower than the experimental temperature, activate the temperature control to maintain the temperature at the experimental temperature. 6) Start the laser and record the displacement data; 7) After the torsion pendulum returns to its forward swing and is blocked by the limiter, the distance between the electric displacement stage and the torsion pendulum is adjusted by the electric displacement stage fine adjustment device, and the contact between the torsion pendulum and the torsion pendulum is determined by the displacement sensor reading, so that it is close to the torsion pendulum without contacting the torsion pendulum. 8) Begin the next pulse-driven experiment.

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