Optical fiber gas detection device

Abstract

The invention belongs to the technical field of gas concentration detection, and discloses an optical fiber gas detection device, which comprises a handheld rod, a gas sensor, a gas sensor and a gas sensor, the probe assembly is arranged on the handheld rod, the probe assembly comprises a probe seat, a piston assembly and a driving assembly, the probe seat is provided with a containing cavity with the top open, the piston assembly is arranged in the containing cavity in a sliding sealing fit mode, and the driving assembly is in transmission connection with the piston assembly to drive the piston assembly to be movably switched between a detection position and a containing position. The probe can be switched between the detection position and the storage position to achieve storage and detection, devices in the probe can be protected in the storage state, negative pressure can be formed in the probe through the action of the piston when the probe is switched to the detection state, more gas is sucked more sufficiently for detection, and the detection efficiency is improved. And a negative pressure gas chamber can be formed to accommodate more gas, and the gas can be kept stable relative to the outside, so that a better guarantee is provided for more accurate and reliable concentration detection.

Description

Technical Field

[0001] The invention belongs to the technical field of gas concentration detection, and in particular relates to an optical fiber gas detection device. Background Art

[0002] There are certain drawbacks in the method and device of measuring the concentration of specific gases using photoacoustic spectroscopy technology. For gas concentration detection under specific circumstances, it is necessary to go deep into the environment, or to insert the gas concentration detection sensor into the environment to be tested. If the concentration of harmful gases in the environment to be tested is high, the instrument is required to send the gas concentration detection sensor into it to prevent the detection personnel from being injured. On the other hand, for gas concentration detection in a small space, traditional instruments cannot go deep into it and have a relatively small scope of application.

[0003] In the prior art, in order to solve the above technical problems, one technical solution is to set the optical fiber sleeve as a handheld structure, and set a gas concentration detection probe at the end of the optical fiber. When in use, the gas concentration detection probe is inserted into a narrow space through the rod-shaped optical fiber structure for detection to avoid contact with people. However, the gas concentration detection probe in this technical solution needs to output the optical signal to the air chamber or other space first, and then reflect it back to the optical fiber through the reflector after reacting with the gas. The optical signal will be weakened after two transmissions, which will lead to inaccurate measured concentration data. In addition, the space for gas to enter the concentration detection probe is very small, which is not conducive to accurate reaction concentration data. Summary of the invention

[0004] In view of this, an object of the present invention is to provide a fiber optic gas detection device to solve the problem that the existing fiber optic gas detection device has poor detection effect and is not accurate enough.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] An optical fiber gas detection device, comprising:

[0007] A hand-held pole with a transmission optical fiber inserted inside; and

[0008] A probe assembly is arranged on a handheld rod, the probe assembly comprises a probe seat, a piston assembly and a driving assembly, the probe seat is provided with a cavity with an open top, the piston assembly is slidably and sealedly fitted in the cavity, the driving assembly is connected to the piston assembly in a transmission manner to drive the piston assembly to switch between a detection position and a storage position, the inner wall of the cavity is provided with a plurality of vents, the vents are located between the detection position and the storage position, a negative pressure air chamber connected with the vents is formed between the piston assembly and the probe seat when the piston assembly is in the detection position, and the piston assembly is stored in the cavity when the piston assembly is in the storage position; the piston assembly comprises a piston member, a first mounting groove is provided at one end of the piston member facing the cavity, a micro laser is embedded in the first mounting groove, the cavity is provided with a mounting channel axially penetrating the probe seat, the transmission optical fiber penetrates into the mounting channel axially along the handheld rod, an optical fiber coupling device and a collimating lens are installed in the mounting channel, the transmission optical fiber, the optical fiber coupling device and the collimating lens are all on the exit optical path of the micro laser, and the negative pressure air chamber is on the exit optical path of the micro laser.

[0009] In a possible implementation, the drive assembly includes a movable end cover and a drive motor. The movable end cover is rotatably mounted outside the piston component and driven by the drive motor to rotate axially along the piston component. The movable end cover has a transmission part that cooperates with the inner wall thread of the probe seat.

[0010] In a possible implementation, a sealing ring is sleeved on the outer wall of the bottom end of the piston component, and the sealing ring is slidably matched with the inner wall of the cavity. When the piston assembly is in the storage position, the sealing ring is lower than the vent hole.

[0011] In a possible implementation, a filter net is provided on the outer side of the probe seat, and the filter net covers each vent hole.

[0012] In a possible implementation, the handheld rod is provided with an optical fiber channel through which the transmission optical fiber is passed, and the handheld rod includes an upper rod portion and a lower rod portion both of which are penetrated by the optical fiber channel, the upper rod portion is connected to the probe seat, and the lower rod portion is hinged to the upper rod portion through a hinge.

[0013] In a possible implementation, the lower rod is provided with an internally hollow handle, the optical fiber channel passes through the handle and the transmission optical fiber extends to the inside of the handle, the end of the transmission optical fiber is connected to a terminal head, and an elastic reset member is provided between the terminal head and the inner cavity of the handle and is sleeved on the outside of the transmission optical fiber.

[0014] In a possible implementation, the lower rod portion is provided with a buckle plate, the upper rod portion is provided with a clamping block, and the buckle plate is clamped and matched with the clamping block.

[0015] In a possible implementation, a handle cover is provided at one end of the handle.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] The optical fiber gas detection device of the present invention has a probe assembly arranged on a handheld rod. The probe assembly can be switched between a detection position and a storage position to achieve storage and detection. The internal components of the probe can be protected in the storage state. When switched to the detection state, a negative pressure can be formed inside through the action of the piston, so that more gas can be more fully sucked in for detection. A negative pressure air chamber can also be formed to accommodate more gas and keep the gas therein stable relative to the outside world, thereby providing better guarantee for more accurate and reliable concentration detection. In addition, by constructing an air chamber structure in the probe assembly and setting a detection optical path at the same time, the laser signal transmission path can be shortened and the detection can be more accurate.

[0018] Moreover, the driving component is integrated on the piston component, and can realize the lifting and lowering drive of the piston frame through the threaded structure, thereby enabling negative pressure suction, and the structure is compact and the design is reasonable.

[0019] At the same time, the hand-held rod can be folded for easy storage, and by arranging a wiring head in the handle and cooperating with a spring return member, the hand-held rod can be in a compressed state when folded, and after unfolding, the wiring head can be reset to its original position through the force accumulation of the spring return member, thereby facilitating wiring transmission. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a front view of an optical fiber gas detection device;

[0021] Figure 2 is a cross-sectional view of an optical fiber gas detection device;

[0022] Figure 3 A cross-sectional view of a probe assembly of an optical fiber gas detection device when the piston assembly is in the storage position;

[0023] Figure 4 A cross-sectional view of a probe assembly of an optical fiber gas detection device when the piston assembly is in a detection position;

[0024] Figure 5 for Figure 2 A partial enlarged schematic diagram of part A;

[0025] Figure 6 It is a structural schematic diagram of an optical fiber gas detection device in a folded state;

[0026] Figure 7 for Figure 2 A partial enlarged schematic diagram of part B in FIG. 1 shows that the terminal head is in an initial position;

[0027] Figure 8 for Figure 7The structure shown is in the position of the terminal head when the handle bar is in a folded state.

[0028] In the figure: 1-handle rod; 11-upper rod; 12-lower rod; 13-hinge; 14-handle; 141-handle cover; 142-elastic reset member; 15-buckle plate; 2-probe assembly; 21-filter screen; 22-piston assembly; 221-piston member; 222-sealing ring; 23-probe seat; 24-vent; 25-cavity; 251-negative pressure chamber; 26-drive assembly; 261-movable end cover; 2611-transmission part; 2612-external thread; 2613-internal thread; 262-drive motor; 3-transmission optical fiber; 4-collimating lens; 5-optical fiber coupling device; 6-micro laser; 7-connector. DETAILED DESCRIPTION

[0029] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is further described in detail below in conjunction with specific implementation methods.

[0030] Please refer to Figure 1-Figure 8 As shown, an embodiment of the present application provides a fiber optic gas detection device, including a handheld rod 1 with a transmission optical fiber 3 inserted therein and a probe assembly 2 arranged on the handheld rod 1.

[0031] The hand-held rod 1 is easy to hold, and can be used with the probe assembly 2 to penetrate into the environment to be tested in some specific situations. This can not only avoid the safety of personnel caused by direct contact between the test personnel and the environment to be tested, but also realize the gas concentration detection in a small space. A transmission optical fiber 3 is inserted into the hand-held rod 1, and the transmission optical fiber 3 is used to transmit optical signals to detection equipment such as optical power meters. This application mainly improves the detection end.

[0032] In an embodiment of the present application, the probe assembly 2 may include a probe seat 23, a piston assembly 22 and a drive assembly 26. The probe seat 23 is provided with a cavity 25 with an open top. The piston assembly 22 is slidably and sealedly fitted in the cavity 25. The drive assembly 26 is transmission-connected to the piston assembly 22 to drive the piston assembly 22 to switch between the detection position and the storage position. The inner wall of the cavity 25 is provided with a plurality of vent holes 24, and the vent holes 24 are located between the detection position and the storage position. When the piston assembly 22 is in the detection position, a negative pressure air chamber 251 connected to the vent holes 24 is formed between the piston assembly 22 and the probe seat 23. When the piston assembly 22 is in the storage position, the piston assembly 22 is stored in the cavity 25.

[0033] The probe seat 23 is connected to the hand-held rod 1, which is used to install the piston assembly 22 and other parts, and the piston assembly 22 is installed in the cavity 25 opened at the top of the probe seat 23. The piston assembly 22 can slide out of or into the cavity 25 under the drive of the driving assembly 26 in the cavity 25. When sliding out of the cavity 25, the piston action can be realized. Through the piston action, it is convenient to quickly suck the external gas into the negative pressure chamber for detection by suction, and when it slides out to the detection position, the gap between the piston assembly 22 and the cavity 25 can be A micro negative pressure air chamber 251 is formed, and the gas can be better detected in the negative pressure air chamber 251. When the piston assembly 22 does not slide out of the cavity 25 or is in the cavity 25 as a whole, it is located in the storage position, that is, in the storage state. In the storage state, effective protection of the internal optical device can be achieved; in this way, the piston assembly 22 can be switched between the detection position and the storage position through the driving assembly 26, that is, the switching of the working state, the formation of the negative pressure air chamber 251, the piston suction action and the recovery and storage can be achieved during the switching process. The vent 24 provided on the cavity 25 can facilitate the inhalation of the gas to be tested. By arranging the vent 24 between the detection position and the storage position, the piston member 221 can form a certain negative pressure after the piston action starts, and then the air chamber space gradually formed in the cavity 25 is connected to the outside through the vent 24 to inhale the gas, so that the gas to be tested can be inhaled faster, which is more convenient and quick, and improves the detection efficiency. By constructing a micro negative pressure air chamber 251 in the probe assembly 2 to detect the gas to be detected, the gas entering the interior can be more stable relative to the external gas, thereby improving the accuracy of concentration detection.

[0034] The piston assembly 22 includes a piston member 221, and a first mounting groove is provided at one end of the piston member 221 facing the cavity 25. A micro laser 6 is embedded in the first mounting groove. The cavity 25 is provided with a mounting channel that axially penetrates the probe seat 23. The transmission optical fiber 3 penetrates into the mounting channel axially along the hand-held rod 1. A fiber coupling device 5 and a collimating lens 4 are installed in the mounting channel. The transmission optical fiber 3, the fiber coupling device 5 and the collimating lens 4 are all on the exit optical path of the micro laser 6. The negative pressure air chamber 251 is on the exit optical path of the micro laser 6. The piston member 221 is installed to be able to slide axially in the cavity 25. The micro laser 6 is installed in the piston member 221 by providing the first mounting groove. The micro laser 6 can emit a laser beam for detection. The laser beam can be coupled and injected into the transmission optical fiber 3 after passing through the negative pressure air chamber 251, the collimating lens 4 and the fiber coupling device 5 in sequence. The optical signal enters the detection equipment such as the incident light power meter through the transmission optical fiber 3 for measurement.

[0035] It can be understood that during the detection principle, an optical power meter and other detection devices are used to measure the optical loss value generated during the process of the beam emitted by the micro-laser 6 passing through the gas in the negative pressure gas chamber 251. The specific calculation method already belongs to the prior art and is not an improvement point of this application, so it will not be elaborated here. Specifically, reference can be made to the measurement method disclosed in the patent document with the patent number CN202020411693.4.

[0036] Through the above technical solution, the probe assembly 2 provided on the handheld rod 1 can be switched between the detection position and the storage position to achieve storage and detection. In the storage state, the internal components of the probe can be protected. When switched to the detection state, a negative pressure can be formed inside through the piston action, more gas can be more fully inhaled for detection, and a negative pressure gas chamber 251 can be formed to accommodate more gas and keep the gas therein stable relative to the outside world, providing better guarantee for more accurate and reliable concentration detection. Moreover, by constructing a gas chamber structure in the probe assembly 2 and simultaneously setting a detection optical path, the laser signal transmission path can be shorter and the detection can be more accurate.

[0037] In one embodiment, as shown in combination with Figure 3 and Figure 4 , the driving assembly 26 includes a movable end cap 261 and a driving motor 262. The movable end cap 261 is rotatably sleeved outside the piston member 221 and is driven by the driving motor 262 to rotate axially along the piston member 221. The movable end cap 261 has a transmission portion 2611 that is in threaded cooperation with the inner wall of the probe base 23.

[0038] The movable end cap 261 is in a cap-like structure and rotatably covers the outside of the piston member 221. It mainly includes an end portion and an annular transmission portion 2611 extending in the axial direction. The end portion is rotatably connected to the top of the piston member 221 and is driven by the driving motor 262. The outer wall of the transmission portion 2611 is provided with an external thread 2612, and the inner wall of the top end of the cavity 25 is provided with an internal thread 2613. The two are in threaded cooperation. When the movable end cap 261 is driven by the driving motor 262, it can rotate, and due to the relationship of screw drive, the movable end cap 261 can move up and down, thereby driving the entire piston assembly 22 to slide out of or retract into the cavity 25 axially. Moreover, the movable end cap 261 adopting the structure of an end cap and cooperating with the driving motor 262 can make the structure more compact, occupy less space, and the lifting transmission is more effective.

[0039] In order to achieve the sliding sealing cooperation between the piston member 221 and the cavity 25, further, a sealing ring 222 is sleeved on the outer wall of the bottom end of the piston member 221. The sealing ring 222 is in sliding cooperation with the inner wall of the cavity 25. When the piston assembly 22 is in the storage position, the sealing ring 222 is lower than the ventilation hole 24.

[0040] In this way, the piston component 221 is in sliding contact with the inner wall of the cavity 25 through the sealing ring 222, and the piston function can be realized under the drive of the driving component 26, which can facilitate negative pressure suction inside. When the piston component 22 is in the storage position, the sealing ring 222 is configured to be lower than the vent 24. In this way, when the piston component 22 is in the storage position, the passage between the piston component 221 and the bottom of the cavity 25 blocked by the sealing ring 222 forms a closed chamber. When the piston component 221 rises, negative pressure will be formed in the chamber first, and when the sealing ring 222 passes through the vent 24, the external air will quickly inhale the external gas to be tested under the internal negative pressure, thereby achieving rapid inhalation. At the same time, as the piston component 221 gradually rises, more gas will be inhaled, which is more conducive to gas detection.

[0041] In order to filter the inhaled air to be tested, a filter 21 is further provided on the outside of the probe seat 23, and the filter 21 covers each vent 24. The filter 21 can filter out impurities such as dust in the external air, thereby making the detection more accurate and protecting the internal optical devices at the same time.

[0042] In a preferred embodiment of the hand-held rod 1, Figure 1 and Figure 2 as well as Figure 5 As shown, the handheld rod 1 is provided with an optical fiber channel for passing the transmission optical fiber 3, and the handheld rod 1 includes an upper rod portion 11 and a lower rod portion 12 both of which are penetrated by the optical fiber channel, the upper rod portion 11 is connected to the probe seat 23, and the lower rod portion 12 is hinged to the upper rod portion 11 through a hinge 13.

[0043] The upper rod 11 and the lower rod 12 are rotatably connected by a hinge 13, so that the upper rod 11 can be rotated relative to the lower rod 12 to achieve folding for easy storage and carrying. In addition, since the optical fiber channel is divided into two sections and is respectively located in the upper rod 11 and the lower rod 12, the middle part of the optical fiber can be bent during folding to facilitate folding, and the optical fiber itself can be bent to a certain extent without damaging the optical fiber.

[0044] In order to realize the external connection of the transmission optical fiber 3 and the reset of the transmission optical fiber 3 after bending, Figure 1 , Figure 7 and Figure 8As shown, the lower rod 12 is provided with a handle 14 with a hollow interior, the optical fiber channel penetrates into the handle 14 and the transmission optical fiber 3 extends to the inside of the handle 14, the end of the transmission optical fiber 3 is connected with a wiring head 7, and an elastic reset member 142 is provided between the wiring head 7 and the inner cavity of the handle 14 and is sleeved on the outside of the transmission optical fiber 3. The wiring head 7 can be easily connected to the detection equipment line, such as an optical power meter and other detection equipment, and the detection data can be obtained by analyzing and calculating the optical signal output by the detection equipment to the transmission optical fiber 3, and the wiring head 7 can be reset by arranging an elastic reset member 142 abutting between the wiring head 7 and the inner cavity of the handle 14 on the outside of the transmission optical fiber 3, so that the wiring head 7 can be reset, which can not only play a role in stretching and restoring the transmission optical fiber 3, but also reset the wiring head 7 to a position close to the end of the handle 14, so as to facilitate wiring. Preferably, a handle cover 141 is provided at one end of the handle 14, and the handle 14 can be opened through the end cover for wiring.

[0045] Specifically, the elastic return member 142 is a return spring with annular stoppers at both ends.

[0046] In order to make the handle 1 stable after unfolding, Figure 5 As shown, the lower rod 12 is also provided with a gusset plate 15, and the upper rod 11 is provided with a clamping block, and the gusset plate 15 is engaged with the clamping block. Through the engagement of the gusset plate 15 and the clamping block, the hand-held rod 1 can be easily fixed after being unfolded, so that the upper rod 11 and the lower rod 12 can be stable.

[0047] In the specific implementation process, a controller (not shown in the figure) can be set on the handle 14, and the controller is electrically connected to the drive motor 262 and the micro laser 6 respectively. The controller controls whether the two are working, and a lithium battery can also be configured in the handle 14 to provide power for the above-mentioned electrical components.

[0048] In addition, one end of the handle 14 is provided with a handle cover 141. The handle 14 can be opened to connect the terminal 7 through the end cover.

[0049] The above are only preferred embodiments of the present invention. It should be noted that the above preferred embodiments should not be regarded as limiting the present invention, and the protection scope of the present invention should be based on the scope defined by the claims. For ordinary technicians in this technical field, several improvements and modifications can be made without departing from the spirit and scope of the present invention, and these improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. An optical fiber gas detection device, characterized in that: include: A hand-held rod (1) having a transmission optical fiber (3) inserted therein; as well as A probe assembly (2) is arranged on a hand-held rod (1), the probe assembly (2) comprising a probe seat (23), a piston assembly (22) and a drive assembly (26); the probe seat (23) is provided with a cavity (25) with an open top; the piston assembly (22) is slidably and sealedly fitted in the cavity (25); the drive assembly (26) is transmission-connected to the piston assembly (22) to drive the piston assembly (22) to switch between a detection position and a storage position; a plurality of vent holes (24) are arranged on the inner wall of the cavity (25); the vent holes (24) are located between the detection position and the storage position; when the piston assembly (22) is in the detection position, a negative pressure air chamber (251) communicating with the vent holes (24) is formed between the piston assembly (22) and the probe seat (23); the piston assembly When the piston assembly (22) is in the storage position, the piston assembly (22) is stored in the cavity (25); the piston assembly (22) comprises a piston component (221); a first mounting groove is provided at one end of the piston component (221) facing the cavity (25); a micro laser (6) is embedded in the first mounting groove; the cavity (25) is provided with a mounting channel axially penetrating the probe seat (23); the transmission optical fiber (3) penetrates into the mounting channel axially along the hand-held rod (1); an optical fiber coupling device (5) and a collimating lens (4) are installed in the mounting channel; the transmission optical fiber (3), the optical fiber coupling device (5) and the collimating lens (4) are all on the output light path of the micro laser (6); and the negative pressure air chamber (251) is on the output light path of the micro laser (6).

2. An optical fiber gas detection device as claimed in claim 1, characterized in that: The driving assembly (26) comprises a movable end cover (261) and a driving motor (262). The movable end cover (261) is rotatably sleeved outside the piston member (221) and driven by the driving motor (262) to rotate along the axial direction of the piston member (221). The movable end cover (261) has a transmission part (2611) threadedly matched with the inner wall of the probe seat (23).

3. The optical fiber gas detection device according to claim 1, characterized in that: The outer wall of the bottom end of the piston component (221) is sleeved with a sealing ring (222), and the sealing ring (222) is slidably matched with the inner wall of the cavity (25). When the piston component (22) is located in the storage position, the sealing ring (222) is lower than the vent hole (24).

4. The optical fiber gas detection device according to claim 1, characterized in that: A filter screen (21) is provided on the outer side of the probe seat (23), and the filter screen (21) covers each vent hole (24).

5. The optical fiber gas detection device according to claim 1, characterized in that: The handheld rod (1) is provided with an optical fiber channel through which the transmission optical fiber (3) is passed. The handheld rod (1) comprises an upper rod portion (11) and a lower rod portion (12) both of which are penetrated by the optical fiber channel. The upper rod portion (11) is connected to a probe seat (23), and the lower rod portion (12) is hinged to the upper rod portion (11) via a hinge (13).

6. An optical fiber gas detection device as claimed in claim 5, characterized in that: The lower rod (12) is provided with an internally hollow handle (14), the optical fiber channel penetrates into the handle (14) and the transmission optical fiber (3) extends to the inner side of the handle (14), the end of the transmission optical fiber (3) is connected with a terminal head (7), and an elastic reset member (142) is provided between the terminal head (7) and the inner cavity of the handle (14) and is sleeved on the outer side of the transmission optical fiber (3).

7. An optical fiber gas detection device as claimed in claim 6, characterized in that: The lower rod part (12) is provided with a buckle plate (15), and the upper rod part (11) is provided with a clamping block, and the buckle plate (15) is clamped and matched with the clamping block.

8. The optical fiber gas detection device according to claim 6, characterized in that: A handle cover (141) is provided at one end of the handle (14).

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