A unidirectional temperature-controlled methane laser

Abstract

A unidirectional temperature-controlled methane laser belongs to the technical field of gas detection and solves the problems of complex topological structure, high production cost and difficult packaging process of existing methane lasers; it comprises a tube seat, a mounting platform, a glass sheet and a temperature control component; the upper surface of the tube seat is provided with a mounting platform, the side of the mounting platform is provided with a glass sheet, and the side of the glass sheet away from the mounting platform is fixedly provided with a temperature control component; the lower surface of the tube seat is provided with a tube pin, the tube pin passes through the upper surface of the tube seat and is connected to the temperature control component; the utility model optimizes the topological structure of the methane laser, eliminates the need for optical right-angle prisms of traditional lasers, has a simple process, adopts the temperature control component to realize unidirectional temperature control of the laser, and effectively improves the accuracy and stability of temperature control.

Description

Technical Field

[0001] The utility model belongs to the technical field of gas detection and relates to a unidirectional temperature-controlled methane laser. Background Art

[0002] TDLAS (Tunable Diode Laser Absorption Spectroscopy) is the abbreviation of tunable semiconductor laser absorption spectroscopy technology. This technology uses the narrow line width and wavelength of tunable semiconductor lasers to change with the injection current to measure a single or several absorption lines of molecules that are very close and difficult to distinguish. In the field of gas detection, TDLAS gas detection technology uses laser wavelength modulation to pass through the characteristic absorption area of ​​the gas being measured. When the semiconductor laser emits a laser beam of a specific wavelength through the gas being measured, the gas being measured absorbs the laser beam, causing the laser intensity to attenuate. The attenuation of the laser intensity is proportional to the content of the gas being measured. By measuring the laser intensity attenuation information, the concentration of the gas being measured can be analyzed and obtained.

[0003] However, the material properties of the laser are very sensitive to temperature changes. Even a 1°C change in temperature will cause a 0.1nm laser wavelength drift. In order to make the laser emit a stable wavelength, the existing laser internally implements temperature regulation by encapsulating a semiconductor TEC thermostat. However, semiconductor TEC temperature control devices are heavily dependent on imports, and there are no alternative products with equivalent performance, making the production cost of methane lasers expensive. The packaging process of methane lasers encapsulated with semiconductor TEC thermostats is difficult, and semiconductor TEC thermostats require the design of temperature control circuits that can complete bidirectional driving for cooling or heating, increasing design costs. At the same time, the existing methane laser packaging structure requires the installation of an optical right-angle prism to deflect the light emitted by the laser emission chip by 90°, making the laser topology complex and difficult to achieve large-scale promotion and production. Utility Model Content

[0004] The technical solution of the utility model is used to solve the problems of complex topological structure, high production cost and difficult packaging process of the existing methane laser.

[0005] The utility model solves the above technical problems through the following technical solutions:

[0006] A unidirectional temperature-controlled methane laser comprises a tube holder, a mounting platform, a glass sheet and a temperature control component; the upper surface of the tube holder is provided with a mounting platform, the side of the mounting platform is provided with a glass sheet, and the side of the glass sheet away from the mounting platform is fixedly provided with a temperature control component; the lower surface of the tube holder is provided with a tube pin, the tube pin passes through the upper surface of the tube holder and is connected to the temperature control component;

[0007] The pins include a first pin, a second pin, a third pin, a fourth pin and a fifth pin; the fifth pin is arranged at the bottom of the mounting platform;

[0008] The temperature control component includes a thin film heating plate and a laser emitting chip, a thermistor and a heating wire packaged on the surface of the thin film heating plate; the thin film heating plate is arranged on the surface of the glass plate, and the surface of the thin film heating plate is coated with a conductive metal; one end of the laser emitting chip is connected to the first pin through a crystal wire, the other end of the laser emitting chip is connected to the conductive metal, and the fifth pin is connected to the other end of the laser emitting chip through a crystal wire to form a laser emitting circuit;

[0009] The two heating wires are connected in parallel and then in series with the thermistor through a conductive metal. The non-series end of the thermistor is connected to the second pin through a crystal wire. The non-series end of the heating wire is connected to the conductive metal. The fourth pin is connected to the non-series end of the heating wire through a crystal wire. The series common end of the heating wire and the thermistor is connected to the fifth pin through a conductive metal to form a temperature control loop.

[0010] Furthermore, the mounting platform is an arc-shaped protrusion, and a glass sheet is fixedly mounted on the non-arc-shaped side surface of the mounting platform.

[0011] Furthermore, the outside of the thermistor is wrapped with gold-tin.

[0012] Furthermore, the exterior of the laser emitting chip is wrapped with gold-tin.

[0013] Furthermore, the first pin, the second pin, and the fourth pin are at a high potential, and the third pin and the fifth pin are at a low potential.

[0014] The advantages of the utility model are:

[0015] (1) The utility model optimizes the topological structure of the methane laser, eliminates the need for optical right-angle prisms in traditional lasers, and has a simple process.

[0016] (2) The utility model adopts a temperature control component to perform unidirectional temperature control on the laser, adopts a thin film heater to replace the TEC temperature controller, and adjusts the heating power of the thin film heater through the temperature control component, thereby reducing the cost of the laser.

[0017] (3) The utility model uses the change of thermistor as feedback value to control the heating voltage and time of the thin film heater, thereby realizing unidirectional temperature control of the laser and effectively improving the accuracy and stability of temperature control. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a front view of a unidirectional temperature-controlled methane laser according to an embodiment of the utility model;

[0019] Figure 2 It is a front view of a unidirectional temperature-controlled methane laser according to an embodiment of the utility model;

[0020] Figure 3 It is a top view of a unidirectional temperature-controlled methane laser according to an embodiment of the utility model;

[0021] Figure 4 It is a rear view of a unidirectional temperature-controlled methane laser according to an embodiment of the utility model.

[0022] Figure numerals: 10, tube seat; 11, first pin; 12, second pin; 13, third pin; 14, fourth pin; 15, fifth pin; 20, mounting table; 30, glass sheet; 40, temperature control component; 41, thin film heating plate; 42, laser emitting chip; 43, thermistor; 44, heating wire. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solution and advantages of the embodiments of the utility model clearer, the technical solution in the embodiments of the utility model will be clearly and completely described below in combination with the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] The technical solution of the utility model is further described below in conjunction with the accompanying drawings and specific embodiments:

[0025] Embodiment 1

[0026] like Figure 1-4 As shown, specifically, a unidirectional temperature-controlled methane laser is disclosed, including a tube holder 10, a mounting platform 20, a glass sheet 30 and a temperature control component 40; the mounting platform 20 is arranged on the upper surface of the tube holder 10, the glass sheet 30 is arranged on the side of the mounting platform 20, and the temperature control component 40 is fixedly installed on the side of the glass sheet 30 away from the mounting platform 20; specifically, the mounting platform 20 is an arc-shaped protrusion, and the glass sheet 30 is fixedly installed on the non-arc-shaped side of the mounting platform 20.

[0027] The lower surface of the tube holder 10 is provided with pins, and the pins pass through the upper surface of the tube holder 10 and are connected to the temperature control component; the pins include a first pin 11, a second pin 12, a third pin 13, a fourth pin 14 and a fifth pin 15; the third pin 13 is arranged at the bottom of the mounting platform 20; in this embodiment, the third pin 13 passes through the inside of the mounting platform 20 and is connected to the temperature control component (not shown in the figure).

[0028] The temperature control component 40 includes a thin film heating plate 41 and a laser emitting chip 42, a thermistor 43 and a heating wire 44 which are packaged on the surface of the thin film heating plate 41; the thin film heating plate 41 is arranged on the surface of the glass sheet 30, and the surface of the thin film heating plate 41 is coated with a conductive metal; one end of the laser emitting chip 42 is connected to the first pin 11 through a crystal wire, and the other end of the laser emitting chip 42 is connected to the conductive metal, and the fifth pin 15 is connected to the other end of the laser emitting chip 42 through a crystal wire to form a laser emitting circuit; the laser emitting circuit is used to emit a laser beam of a specific wavelength, and after the laser beam passes through the methane gas, the concentration of the methane gas is analyzed according to the attenuation information of the laser intensity. Specifically, as Figure 2 As shown, LD is a laser emitting chip 42 , the fifth pin 15 is at a low potential, connected to the negative electrode of the laser emitting chip 42 ; and the first pin 11 is at a high potential, connected to the positive electrode of the laser emitting chip 42 .

[0029] The two heating wires 44 are connected in parallel and then in series with the thermistor 43 through a conductive metal. The non-series end of the thermistor 43 is connected to the second pin 12 through a crystal wire. The non-series end of the heating wire 44 is connected to the conductive metal. The fourth pin 14 is connected to the non-series end of the heating wire 44 through a crystal wire. The series common end of the heating wire 44 and the thermistor 43 is connected to the third pin 13 through a conductive metal to form a temperature control loop. The temperature control loop is used to heat the thin film heating plate 41, generate heat to heat up the laser emission chip 42, and keep the wavelength of the laser emission chip 42 at the corresponding methane gas absorption peak. Specifically, Figure 2 As shown, Thermistor is a thermistor 43, R is a heating wire 44, the second pin 12 is at a high potential and connected to the non-series end of the thermistor 43; the fourth pin 14 is also at a high potential and connected to the non-series end of the heating wire 44; the third pin 13 is at a low potential and connected to the series common end of the heating wire 44 and the thermistor 43.

[0030] Working principle:

[0031] like Figure 2 As shown, the utility model controls the heating voltage and time of the thin film heater by energizing and heating the heating wire in the temperature control loop, adjusts the output power of the thin film heater, and generates heat for heating the laser emission chip. Since the wavelength of the laser emission chip changes with the temperature, in order to keep the wavelength of the laser emission chip in the laser emission loop at the corresponding methane gas absorption peak, the utility model also uses the change of the thermistor in the temperature control loop as feedback, adjusts the heating voltage and time of the thin film heater in the form of negative feedback control, and combines the self-heating characteristics of the temperature field to achieve unidirectional heating control of the laser.

[0032] The utility model realizes output power adjustment of the thin film heater through the temperature control component, replaces the existing semiconductor TEC temperature controller, and improves the temperature control reliability; at the same time, simplifies the topological structure and device size of the methane laser, and reduces the production cost.

[0033] The utility model optimizes the topological structure of the methane laser. Compared with the traditional methane laser packaging structure that uses an optical device right-angle prism to deflect the laser emitted by the laser emission chip by 90°, the utility model installs the temperature control component where the laser emission chip is located perpendicular to the plane where the mounting table surface is located, thereby eliminating the need for optical right-angle prisms in traditional lasers, simplifying the methane laser preparation process, reducing the laser production cost, and realizing the large-scale promotion and application of methane laser detection technology.

[0034] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A unidirectional temperature-controlled methane laser, characterized in that: The invention comprises a tube seat (10), a mounting platform (20), a glass sheet (30) and a temperature control component (40); the upper surface of the tube seat (10) is provided with a mounting platform (20), the side of the mounting platform (20) is provided with a glass sheet (30), and the temperature control component (40) is fixedly mounted on the side of the glass sheet (30) away from the mounting platform (20); the lower surface of the tube seat (10) is provided with a tube pin, the tube pin passes through the upper surface of the tube seat (10) and is connected to the temperature control component; The pins include a first pin (11), a second pin (12), a third pin (13), a fourth pin (14) and a fifth pin (15); the fifth pin (15) is arranged at the bottom of the mounting platform (20); The temperature control component (40) comprises a thin film heating plate (41) and a laser emitting chip (42), a thermistor (43) and a heating wire (44) which are packaged on the surface of the thin film heating plate (41); the thin film heating plate (41) is arranged on the surface of the glass plate (30), and the surface of the thin film heating plate (41) is coated with a conductive metal; one end of the laser emitting chip (42) is connected to the first pin (11) through a crystal wire, the other end of the laser emitting chip (42) is connected to the conductive metal, and the fifth pin (15) is connected to the other end of the laser emitting chip (42) through a crystal wire to form a laser emitting circuit; The two heating wires (44) are connected in parallel and then connected in series with the thermistor (43) through a conductive metal; the non-series end of the thermistor (43) is connected to the second pin (12) through a crystal wire; the non-series end of the heating wire (44) is connected to the conductive metal; the fourth pin (14) is connected to the non-series end of the heating wire (44) through a crystal wire; the series common end of the heating wire (44) and the thermistor (43) is connected to the fifth pin (15) through a conductive metal, thereby forming a temperature control loop.

2. A unidirectional temperature-controlled methane laser according to claim 1, characterized in that: The mounting platform (20) is an arc-shaped convex block, and a glass sheet (30) is fixedly mounted on the non-arc-shaped side surface of the mounting platform (20).

3. The unidirectional temperature-controlled methane laser according to claim 1, characterized in that: The outside of the thermistor (43) is wrapped with gold-tin.

4. The unidirectional temperature-controlled methane laser according to claim 1, characterized in that: The exterior of the laser emitting chip (42) is wrapped with gold tin.

5. The unidirectional temperature-controlled methane laser according to claim 1, characterized in that: The first pin (11), the second pin (12), and the fourth pin (14) are at high potentials, and the third pin (13) and the fifth pin (15) are at low potentials.

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