CN112858389B - Imaging dew point meter - Google Patents

Imaging dew point meter Download PDF

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Publication number
CN112858389B
CN112858389B CN202011620801.XA CN202011620801A CN112858389B CN 112858389 B CN112858389 B CN 112858389B CN 202011620801 A CN202011620801 A CN 202011620801A CN 112858389 B CN112858389 B CN 112858389B
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detection
camera
dew point
imaging
defogging
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CN112858389A (en
Inventor
张宾
何伟生
陈新准
马鹏飞
郑晓银
赵罗恒
刘光亮
邱国财
刘新雅
张运龙
李修龙
傅王勇
李国宁
周海岽
吴凯萍
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Guangzhou Aosong Electronics Co Ltd
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Guangzhou Aosong Electronics Co Ltd
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N25/00—Investigating or analyzing materials by the use of thermal means
    • G01N25/56—Investigating or analyzing materials by the use of thermal means by investigating moisture content
    • G01N25/66—Investigating or analyzing materials by the use of thermal means by investigating moisture content by investigating dew-point
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/01—Arrangements or apparatus for facilitating the optical investigation
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/01—Arrangements or apparatus for facilitating the optical investigation
    • G01N21/15—Preventing contamination of the components of the optical system or obstruction of the light path
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/84—Systems specially adapted for particular applications
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/01—Arrangements or apparatus for facilitating the optical investigation
    • G01N21/15—Preventing contamination of the components of the optical system or obstruction of the light path
    • G01N2021/155—Monitoring cleanness of window, lens, or other parts

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  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Investigating Or Analyzing Materials Using Thermal Means (AREA)

Abstract

The invention relates to the technical field of dew condensation measurement, and provides an imaging dew point instrument which comprises a control system, a dew condensation system, a heat dissipation system and a photoelectric detection system, wherein the dew condensation system, the heat dissipation system and the photoelectric detection system are respectively connected with the control system, the dew condensation system comprises a mirror surface, and the photoelectric detection system comprises a photoelectric imaging device and a detection cover body; the detection cover body comprises a detection cavity and a detection upper cover arranged above the detection cavity, the photoelectric imaging device is arranged in the detection upper cover and comprises a light source and a camera, the camera is provided with a lens, the light source is arranged on one side of the detection upper cover, and the camera is arranged in the middle of the detection upper cover. The invention improves the photoelectric detection system, solves the problem of poor reliability and anti-interference performance of the dew point instrument and enables the dew point measurement value to be more accurate.

Description

Imaging dew point meter
Technical Field
The invention relates to the technical field of dew condensation measurement, in particular to an imaging dew point instrument.
Background
The working principle of the existing dew point meter is as follows: when the measured gas enters the dewing chamber and passes over the mirror surface at a certain flow speed, the temperature of the mirror surface is higher than the dew point temperature of the gas, and the incident light of the light source is nearly totally reflected by the dry mirror surface. When the dew point instrument is used for measuring, the refrigerating device is controlled according to the intensity of reflected light detected by the photoelectric detector, so that the temperature of the mirror surface is reduced until the mirror surface is dewed or frosted, at the moment, incident light can generate diffuse reflection on the mirror surface, the intensity of the reflected light can be correspondingly changed, the photoelectric detector senses the change of a reflected light signal, the temperature is locked, and the temperature at the moment is the dew point value of the gas.
The method has the advantages that the reliability and the anti-interference performance are poor, the precision is low, when dirt or scratches exist on the mirror surface, incident light can generate diffuse reflection on the mirror surface in advance, the photoelectric detector locks the temperature in advance, and the temperature at the moment is actually not the dew point value of the gas.
Disclosure of Invention
The present invention is directed to overcoming at least one of the above-mentioned deficiencies in the prior art and providing an imaging dew point meter that solves the problem of poor reliability and interference immunity of the dew point meter, resulting in more accurate dew point measurements.
The technical scheme adopted by the invention is that the imaging dew point instrument comprises a control system, a dew condensation system, a heat dissipation system and a photoelectric detection system, wherein the dew condensation system, the heat dissipation system and the photoelectric detection system are respectively connected with the control system, the dew condensation system comprises a mirror surface, and the photoelectric detection system comprises a photoelectric imaging device and a detection cover body; the detection cover body comprises a detection cavity and a detection upper cover arranged above the detection cavity, and the photoelectric imaging device is arranged in the detection upper cover; the photoelectric imaging device comprises a light source and a camera, the camera is provided with a lens, the light source is arranged on one side of the detection upper cover, and the camera is arranged in the middle of the detection upper cover; the control system controls the camera to enable the camera to continuously shoot mirror images at fixed time intervals, the images shot by the camera are transmitted to the control system, the control system analyzes the images shot by the camera, and then the dewing system is controlled to obtain a dew point.
In the scheme, the control system compares the brightness of all pixels in the 1 st image shot by the camera according to the time sequence with the brightness of all pixels in the 2 nd and subsequent images according to an absolute value difference method, compares the absolute value of the brightness difference in the same pixel, decomposes the absolute value of the brightness difference between each image and the 1 st image into 256 gray levels, creates a gray level histogram of each image and the 1 st image, ignores the pixels with the brightness difference of 0, controls the condensation system to adjust the temperature according to the result of analyzing the gray level histogram, and detects the condensation value.
Compared with the prior art, the dew point measuring method has the advantages that the measuring precision of the dew point in the measured gas can be improved by analyzing the image of the surface of the mirror surface, the dew point in the measured gas can be measured in a short time, in addition, the measuring error caused by dirt or scratches on the mirror surface is removed through differential processing, so the detection sensitivity of a dew condensation system is improved, the measuring precision can be greatly improved, meanwhile, the error caused by the dirt and scratches on the camera lens can also be avoided, and the reliability and the anti-interference performance of a dew point instrument are improved.
Furthermore, the camera is covered with a transparent cover, and the transparent cover is connected to the detection upper cover. In this scheme, through set up the translucent cover outside the camera, make camera and testing environment separate, the protection camera does not receive the injury of detecting gas and water smoke etc..
Further, the inner side of the upper surface of the transparent cover is connected with the surface of the lens of the camera in a sealing mode. In this scheme, with translucent cover upper surface and camera lens surface sealing connection, prevent that the clearance between translucent cover and the camera lens surface from producing water smoke.
Furthermore, a humidity sensor is arranged at a position, outside the visual field range of the camera, of the outer side of the upper surface of the transparent cover and used for detecting humidity change of the outer side of the upper surface of the transparent cover.
Furthermore, a driving box is installed on one side of the transparent cover, a driving piece is installed inside the driving box, the driving piece is connected with a defogging rod, and the driving piece drives the defogging rod to swing back and forth on the upper surface of the transparent cover to perform defogging work on the transparent cover.
Further, the defogging rod is L-shaped; one end of the defogging rod is connected with the driving piece in the driving box, and the other end of the defogging rod extends to the outer side of the upper surface of the transparent cover.
Furthermore, the defogging rod is not connected to the one end inboard of driving piece is provided with the defogging pad, the defogging rod with the defogging pad cementing is connected.
In this scheme, when humidity transducer detected the change of translucent cover upper surface outside humidity, humidity transducer sends a signal to control system, and control system control driving piece drive defogging pole swing drives the translucent cover upper surface outside is cleaned to the defogging pad, gets rid of the fog in the translucent cover upper surface outside, guarantees the quality of the image that the camera was shot.
Furthermore, the camera and the driving box are provided with cooling fins, so that heat emitted by the camera and the driving piece can be timely dissipated.
Further, the condensation system further comprises: the temperature detector is used for detecting temperature; the upper surface of the refrigeration sheet is a refrigeration surface, and the lower surface of the refrigeration sheet is a heat dissipation surface; the lower surface of the heat conduction structure is connected with the refrigerating surface so as to transmit the cold energy of the refrigerating surface to the upper surface of the heat conduction structure, and the heat conduction structure is also connected with the thermometer; the lower surface of the mirror surface is connected with the upper surface of the heat conduction structure so as to transfer the cold energy on the upper surface of the heat conduction structure to the upper surface of the mirror surface, so that the water vapor in the working environment is condensed on the upper surface of the mirror surface; wherein the thermometer is a platinum resistor, and the outer surface of the thermometer is provided with a heat-conducting silicone grease layer or a heat-conducting adhesive layer; the mirror surface is a silicon wafer, and a platinum layer or a gold layer or a rhodium layer is arranged on the outer surface of the mirror surface.
In this scheme, the thermometer is through detecting the temperature of heat conduction structure, measures the temperature of mirror surface indirectly to measure the temperature of steam. The refrigerating sheet is characterized in that the refrigerating surface of the refrigerating sheet forms cold energy to act on the heat conducting structure through a thermoelectric refrigerating principle, and the radiating surface of the refrigerating sheet forms heat to act on a part connected with the radiating surface. The heat conduction structure is used for transferring cold energy from the cooling sheet to the mirror surface. The upper surface of the mirror surface is a place for dewing. The mirror surface is arranged as a silicon wafer, the surface of the mirror surface is smooth and bright, and the heat conduction efficiency is high.
In the scheme, the cold quantity generated by the refrigerating surface of the refrigerating sheet is transmitted to the upper surface of the mirror surface through the heat conduction structure, so that the water vapor in the operation environment is condensed to the upper surface of the mirror surface, and the temperature of the heat conduction structure is detected through the temperature detector, so that the temperature of the mirror surface is indirectly detected, namely the dew point temperature of the gas is detected, and the humidity in the gas is obtained.
In this scheme, be equipped with platinum layer or gold layer or rhodium layer at the surface of mirror surface, give up the technique that conventional mirror surface was equipped with the gold layer for the surface of copper and copper to make this scheme can improve the anti-soil ability of mirror surface, and make the mirror surface is difficult by scratching and decreases, avoids detecting the precision and receives adverse effect.
Furthermore, the control system comprises a control adapter plate, an electric needle and a remote control host; the heat dissipation system comprises a heat dissipation seat, and the heat dissipation seat is provided with a cavity; the control adapter plate is positioned in the cavity and connected to the remote control host; the electric needle is inserted into the cavity and electrically connected with the control adapter plate, and the electric needle is in insulated connection with the heat dissipation seat; wherein, the electric needle is also electrically connected with the photoelectric detection system and the dewing system; the cooling surface that the refrigeration piece was equipped with connect in the radiating seat.
In this scheme, the radiating seat is used for with the heat that refrigeration structure's cooling surface produced distributes away. The electric needle is connected with the heat dissipation seat in an insulating mode, and the influence of the heat dissipation seat on the normal use of the dew point detector is avoided. The cavity is used for accommodating the control adapter plate, and the electric pin is inserted in the cavity and electrically connected to the control adapter plate, so that the circuit of the dew point detector is intensively positioned in the cavity of the heat dissipation seat, the circuit is prevented from being exposed outside the dew point detector, the detection effect is influenced, and the circuit is damaged.
Compared with the prior art, the invention has the beneficial effects that: the invention is provided with the photoelectric imaging device, obtains dew point values by shooting and analyzing images on the surface of the mirror surface of the dew condensation system, can improve the measurement precision of the dew point in the measured gas, can measure the dew point in the measured gas in a short time, removes the measurement error of the mirror surface caused by dirt or scratches through differential processing, improves the detection sensitivity of the dew condensation system, greatly improves the measurement precision, can avoid the error caused by the dirt and scratches on the camera lens, improves the reliability and the anti-interference performance of a dew point instrument, and is provided with the transparent cover and the defogging device outside the camera, thereby protecting the camera, ensuring the quality of the images shot by the camera and further ensuring the measurement precision of the dew point.
Drawings
Fig. 1 is an exploded view of the present invention.
Fig. 2 is a cross-sectional view of the present invention.
FIG. 3 is a bottom view of part A of the present invention.
Fig. 4 is an exploded view of the dew condensation system of the present invention.
FIG. 5 is an enlarged view of part A of the present invention.
Reference numerals: the device comprises a detection upper cover 11, a detection cavity 12, a light source 13, a camera 14, an air hole 121, a transparent cover 21, a driving box 22, a defogging rod 23, a defogging pad 231, a mirror surface 31, a sealing ring 32, a heat conduction structure 33, a thermometer 34, a refrigerating sheet 35, a heat dissipation seat 41, an aviation connector 42, a heat dissipation tail cover 43, a cavity 411, an electric needle 51 and a control adapter plate 52.
Detailed Description
The drawings are only for purposes of illustration and are not to be construed as limiting the invention. For a better understanding of the following embodiments, certain features of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
Examples
As shown in fig. 1, the present embodiment provides an imaging dew point hygrometer, which includes a control system, a dew condensation system, a heat dissipation system, and a photoelectric detection system, where the dew condensation system, the heat dissipation system, and the photoelectric detection system are respectively connected to the control system.
Specifically, the dew condensation system includes mirror surface 31, the photodetection system includes photoelectric imaging device and detection lid, the detection lid includes detection chamber 12 and sets up in detection upper cover 11 above detection chamber 12, photoelectric imaging device sets up in detecting upper cover 11, photoelectric imaging device includes light source 13 and camera 14, camera 14 is equipped with the camera lens, light source 13 sets up in the one side of detecting upper cover 11, camera 14 sets up in the middle of detecting upper cover 11, wherein, control system makes camera 14 continuously shoots mirror surface 31 image with fixed time interval through controlling camera 14, and will the image that camera 14 shot transmit control system, control system receives after the image according to absolute value difference method, carries out the order comparison with the luminance of all pixels in the 1 st image of shooing that camera 14 shot according to the time sequence with the luminance of all pixels in 2 nd each later image, compares the absolute value of luminance difference in the same pixel, decomposes luminance absolute value difference into 256 with the 1 st image, makes the luminance difference of every image and the 1 st image of shooing in the time sequence, the pixel's of every image and the later each grey level difference histogram is ignored for the dew condensation control system, the detection control system is 0 grey scale temperature histogram.
In this embodiment, the light source 13 is an LED emitting light source, and the time interval for the camera 14 to take the pictures of the mirror 31 is 1/20 second.
As shown in fig. 2 and 5, the camera 14 is covered with a transparent cover 21, and the transparent cover 21 is connected to the upper detection cover 11.
In order to prevent the camera 14 from being damaged by the gas and water mist to be detected, the inner side of the upper surface of the transparent cover 21 is hermetically connected with the surface of the lens of the camera 14.
Further, a humidity sensor is disposed at a position outside the visual field of the camera 14 on the upper surface of the transparent cover 21, and is configured to detect a humidity change outside the upper surface of the transparent cover 21.
As shown in fig. 3, a driving box 22 is installed on one side of the transparent cover 21, a driving element is installed inside the driving box 22, the driving element is connected with a defogging rod 23, and the driving element drives the defogging rod 23 to swing back and forth on the upper surface of the transparent cover 21 to perform a defogging operation on the transparent cover 21.
Specifically, the defogging rod 23 is L-shaped; wherein, one end of the defogging rod 23 is connected with the driving member in the driving box 22, and the other end extends to the outside of the upper surface of the transparent cover 21.
Furthermore, the defogging rod 23 is not connected to the inner side of one end of the driving member and is provided with a defogging pad 231, and the defogging rod 23 is connected with the defogging pad 231 in a gluing manner.
When the humidity sensor detects that the humidity on the outer side of the upper surface of the transparent cover 21 changes, the humidity sensor sends a signal to the control system, and the control system controls the driving piece to drive the defogging rod 23 to swing so as to drive the defogging pad 231 to wipe the outer side of the upper surface of the transparent cover 21, so that the fog on the outer side of the upper surface of the transparent cover 21 is removed, and the quality of images shot by the camera is ensured.
Further, heat radiating fins are provided on the camera 14 and the drive box 22.
As shown in fig. 4, the condensation system includes a mirror 31, a sealing ring 32, a heat conducting structure 33, a thermometer 34, and a cooling fin 35. The condensation system is installed on the heat dissipation system. The specific working process of the condensation system is as follows: the refrigeration piece 35 generates refrigeration capacity through a thermoelectric refrigeration principle, and the refrigeration capacity generated by the refrigeration piece 35 is transmitted to the upper surface of the mirror surface 31 through the heat conduction structure 33, so that water vapor in the working environment is condensed to the upper surface of the mirror surface 31 to form condensate. The dew condensation system indirectly detects the temperature of the mirror surface 31 by detecting the temperature of the heat conducting structure 33 by the thermometer 34, thereby indirectly obtaining the humidity of the gas.
Specifically, the refrigeration sheet 35 has a refrigeration surface and a heat dissipation surface, and the upper surface of the refrigeration sheet 35 is the refrigeration surface and the lower surface thereof is the heat dissipation surface. In detail, the cooling plate 35 may have a three-layer structure, but is not limited to the three-layer structure.
In this embodiment, the refrigeration sheet 35 is a refrigeration sheet having a three-layer structure, and the cross-sectional area of the uppermost layer structure of the refrigeration sheet 35 is smaller than that of the other layers.
In particular, the heat conducting structure 33 is used to transfer the cooling energy coming from the cooling surface of the cooling plate 35. In detail, the heat conducting structure 33 has an upper surface and a lower surface, and the lower surface of the heat conducting structure 33 is connected to the refrigerating surface to transfer the refrigerating capacity of the refrigerating surface to the upper surface of the heat conducting structure 33. In detail, in order to reduce the volume of the heat conducting structure 33, the heat conducting structure 33 has a substantially rectangular parallelepiped shape. In detail, in order to reduce the volume of the dewing system, the heat conducting structure 105 is further modified in that the heat conducting structure 33 is recessed from the side, upper and lower surfaces to the inside to remove a portion of the structure to form an open area in which the thermometer 34 is embedded. In detail, the open area is substantially rectangular parallelepiped. In detail, the heat conductive structure 33 may be made of a heat conductive metal, preferably copper.
In this embodiment, in order to further accommodate the temperature detector 34, the heat conducting structure 33 is further modified, the heat conducting structure 33 is recessed from the outer wall thereof to form a groove, and the temperature detector 34 is embedded in the groove and matched with the groove.
Specifically, the mirror surface 31 is a condensation place of the condensation system. The lower surface of the mirror surface 31 is connected with the upper surface of the heat conducting structure 33, so that the cold energy on the upper surface of the heat conducting structure 33 is transferred to the upper surface of the mirror surface 31, and the water vapor in the working environment is condensed on the upper surface of the mirror surface 31 to form condensate. In detail, in order to improve the heat conduction efficiency, the mirror 31 is a silicon wafer having a substantially square cross section. In detail, in order to improve the anti-pollution capability of the mirror surface 31 and make the mirror surface 31 not easy to be scratched, a platinum layer or a gold layer or a rhodium layer is provided on the outer surface of the mirror surface 31, further, the platinum layer or the gold layer or the rhodium layer is provided on the upper surface of the mirror surface 31, and further, a hydrophobic material layer is provided on the mirror surface 31.
Specifically, the thermometer 34 is used for temperature measurement. In detail, the thermometer 34 has a substantially rectangular parallelepiped shape, and the thermometer 34 is fitted to the open area. In detail, the temperature detector 34 is a platinum resistor, and in order to further increase the heat conduction area, a heat conduction silicone layer or a heat conduction adhesive layer is disposed on the outer surface of the platinum resistor, so that the temperature detector 34 and the heat conduction structure 33 are tightly attached without a gap.
Specifically, in order to prevent moisture from permeating into the dew point sensor through the dew condensation system, the embodiment of the present application adopts the sealing ring 32 for sealing. The sealing ring 32 has a receiving cavity communicating the upper and lower surfaces, and in detail, the sealing ring 32 is substantially in a trapezoid table shape, and the side surface of the trapezoid table surrounds along the heat conducting structure 33 to form a frame body and wraps the periphery of the mirror surface 31. In detail, the heat conducting structure 33, the mirror 31 and the temperature detector 34 are all enclosed in the sealing ring 32, that is, the heat conducting structure 33, the mirror 31 and the temperature detector 34 are all located in the accommodating cavity. Specifically, the upper surface of the packing 32 is spaced apart from the lower surface thereof, and the lower end of the packing 32 is covered with the upper end of the cooling fin 35. In detail, the lower end of the sealing ring 32 is wrapped around the uppermost structure of the cooling plate 35. In detail, in order to locate the moisture condensed on the upper surface of the mirror 31 in the area where the upper surface of the mirror 31 is located, the upper surface of the seal ring 32 has a certain distance from the upper surface of the mirror 31, and the upper surface of the seal ring 104 is higher than the upper surface of the mirror 31. In detail, in order to further improve the air tightness of the condensation system, the sealing ring 32 is tightly connected to the mirror surface 31, and the sealing ring 32 may be a rubber sealing ring.
Specifically, after the detection cover body is installed on the heat dissipation system, the dew condensation system is located in the detection cavity 12. In detail, for convenience of mounting the photoelectric imaging device, the transparent cover 21, the defogging rod 23 and the driving box 22 on the upper end portion of the detection upper cover 11, the detection upper cover 11 is detachably connected with the detection cavity 12. In particular, the dew condensation system is located within the detection chamber 12. An air hole 121 is formed in the side wall of the detection cavity 12.
The control system comprises an electric needle 51, a control adapter plate 52, an aviation connector 42 and a remote control host.
Specifically, the electric needle 51 is used for electric conduction. In detail, the electrical needle 51 is composed of a conductive metal, and it is provided with several pieces. The electrical pins 51 may be provided in the same size or in different sizes. Specifically, the aviation connector 42 is also connected to a remote control host, so that the remote control host can perform information interaction with the control adapter plate 52. The control adapter plate 52 can observe the current detection state and the corresponding parameters through a screen arranged on the remote control host, and set the detection parameters through the remote control host. In detail, the electrical pin 51 may be connected to the control adaptor plate 52 by means of welding. The electric needle 51 may be electrically connected to a photodetection system and a dew condensation system via a cable.
The heat dissipation system includes a heat dissipation base 41 and a heat dissipation tail cover 43.
Specifically, the heat sink 41 has a substantially cylindrical shape. The upper surface of the heat sink 41 is connected to the heat radiating surface of the cooling structure 107 of the dew condensation system so as to radiate heat generated from the heat radiating surface through the heat sink 41. Specifically, in order to facilitate heat dissipation, the heat sink 41 may be made of a metal material. In detail, the lower end of the heat sink 41 is provided with a cavity 411.
Specifically, the heat dissipation tail cover 43 is sequentially provided with an aviation connector 42 and a control adapter plate 52 from bottom to top, and the aviation connector 42 is connected with the control adapter plate 52. In detail, the heat dissipating tail cap 43 is mounted on the lower end portion of the heat dissipating seat 41, and the heat dissipating tail cap 43 may be connected to the heat dissipating seat 41 by a screw.
When the heat dissipation tail cover 43 and the heat dissipation base 41 are mounted, the aviation connector 42 and the control adapter plate 52 are located in the cavity 411. In detail, the aeronautical interface 42 can also be connected to an electrical needle 51. In detail, the electrical pin 51 is inserted into the cavity 411 and electrically connected to the control adapter plate 52, and the electrical pin 51 is connected to the heat sink 41 in an insulating manner. The electrical pins 51 may be inserted from the upper end of the heat sink 41 downward to the cavity 411.
Wherein, for prevent that vapor and air from getting into to cause damage, avoid toxic gas to leak the external world through cavity 411 to dew point detector internal circuit and components and parts, avoid electric needle 51 and radiating seat 41 electrically conductive, avoid being connected between electric needle 51 and the control keysets 52 and produce the dislocation, this application embodiment is filled with the sealant in cavity 411. The sealant may be glue, and in detail, the glue is filled in the cavity 411, and the glue seals the cavity 411.
In this embodiment, to prevent the electrical pin 51 and the heat sink 41 from being electrically conductive, an insulating pad may be disposed on the inner wall of the cavity 411, and the insulating pad may be a rubber pad.
In the present embodiment, the electrical pins 51 and the control adapter plate 52 may be fixed by a glass sintering process.
In the present embodiment, sealing against gas pressure between the electrical pin 51 and the heat sink 41 can be achieved by a glass sintering process.
The specific working process of the dew point meter is as follows: the camera 14 in the optoelectronic imaging device takes a first image before the dew-point hygrometer starts working, and continuously takes images on the mirror 31 at time intervals of 1/20 second, each image is immediately transmitted to the control system for analysis, and water vapor in the working environment passes through the detection chamber 12 and sweeps over the upper surface of the mirror 31. When the temperature of the upper surface of the mirror 31 is higher than the dew point temperature of the gas, the upper surface of the mirror 31 is in a dry state. At this time, under the control of the control system, the optoelectronic imaging device transmits a signal to the remote control host through the switching control board 52 and the aviation connector 42, and receives a feedback signal from the remote control host, and the feedback signal is compared and amplified by the control loop to drive the refrigerating sheet 35 to refrigerate. When the temperature of the upper surface of the mirror 31 is reduced to be lower than the dew point temperature of the gas, the upper surface of the mirror 31 starts to dewfall to form condensate, at this time, the photoelectric imaging device continuously transmits a signal to the remote control host through the transfer control board 52 and the aviation connector 42, receives a feedback signal from the remote control host, compares and amplifies the feedback signal through the control loop according to the change of the feedback signal, adjusts the excitation current of the refrigerating sheet 35, changes the refrigerating power of the refrigerating sheet 35, and enables the temperature of the upper surface of the mirror 31 to be consistent with the dew point temperature of the gas. At this time, the temperature of the mirror surface 31 is detected by the thermometer 34, and the dew point or frost point in the gas can be obtained.
It should be understood that the above-mentioned embodiments of the present invention are only examples for clearly illustrating the technical solutions of the present invention, and are not intended to limit the specific embodiments of the present invention. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention claims should be included in the protection scope of the present invention claims.

Claims (9)

1. An imaging dew point instrument comprises a control system, a dew condensation system, a heat dissipation system and a photoelectric detection system, wherein the dew condensation system, the heat dissipation system and the photoelectric detection system are respectively connected with the control system, the dew condensation system comprises a mirror surface (31), and the photoelectric detection system comprises a photoelectric imaging device and a detection cover body; the detection cover body comprises a detection cavity (12) and a detection upper cover (11) arranged above the detection cavity (12), and the photoelectric imaging device is arranged in the detection upper cover (11);
the photoelectric imaging device is characterized by comprising a light source (13) and a camera (14), wherein the camera (14) is provided with a lens, the light source (13) is arranged on one side of the detection upper cover (11), and the camera (14) is arranged in the middle of the detection upper cover (11);
the control system controls the camera (14) to enable the camera (14) to continuously shoot images of a mirror surface (31) at fixed time intervals, the images shot by the camera (14) are transmitted to the control system, the control system analyzes the images shot by the camera (14), and then the control system controls the condensation system to obtain a dew point;
the dew condensation system further comprises:
a thermometer (34) for detecting a temperature;
the upper surface of the refrigeration sheet (35) is a refrigeration surface, and the lower surface of the refrigeration sheet is a heat dissipation surface;
the lower surface of the heat conduction structure (33) is connected with the refrigerating surface so as to transfer the cold energy of the refrigerating surface to the upper surface of the heat conduction structure (33), the heat conduction structure (33) is also connected with the temperature measurer (34), the heat conduction structure (33) is internally sunken from the outer wall of the heat conduction structure to form a groove, and the temperature measurer (34) is embedded in the groove and matched with the groove;
the sealing ring (32) is roughly in a trapezoid table shape, the side face of the trapezoid table surrounds along the heat conducting structure (33) to form a frame body, the frame body wraps the periphery of the mirror face (31), and the upper surface of the sealing ring is higher than that of the mirror face (31);
the lower surface of the mirror surface (31) is connected with the upper surface of the heat conduction structure (33) so as to transfer cold energy on the upper surface of the heat conduction structure (33) to the upper surface of the mirror surface (31) and enable water vapor in a working environment to be condensed on the upper surface of the mirror surface (31);
the thermometer (34) is a platinum resistor, and the outer surface of the thermometer is provided with a heat-conducting silicone layer or a heat-conducting adhesive layer; the mirror surface (31) is a silicon wafer, and a platinum layer, a gold layer or a rhodium layer is arranged on the outer surface of the mirror surface;
the upper surface of the sealing ring (32) and the lower surface of the sealing ring have a certain distance, and the lower end part of the sealing ring encloses the upper end part of the refrigerating sheet (35).
2. An imaging dew point meter as claimed in claim 1, characterised in that the camera (14) is covered by a transparent cover (21), the transparent cover (21) being connected to the upper detection cover (11).
3. An imaging dew point meter as claimed in claim 2, characterised in that the inside of the upper surface of the transparent cover (21) is sealingly connected to the surface of the lens of the camera (14).
4. An imaging dew point meter as claimed in claim 3, characterised in that a humidity sensor is provided outside the upper surface of the transparent cover (21) outside the field of view of the camera (14) for detecting changes in humidity outside the upper surface of the transparent cover (21).
5. An imaging dew point instrument as claimed in claim 2, wherein a driving box (22) is installed on one side of the transparent cover (21), a driving member is installed inside the driving box (22), the driving member is connected with a defogging rod (23), and the driving member drives the defogging rod (23) to swing back and forth on the upper surface of the transparent cover (21) to perform a defogging operation on the transparent cover (21).
6. An imaging dew point meter as claimed in claim 5, characterised in that the defogging bars (23) are L-shaped;
one end of the defogging rod (23) is connected with the driving piece in the driving box (22), and the other end of the defogging rod extends to the outer side of the upper surface of the transparent cover (21).
7. An imaging dew point meter as claimed in claim 6, wherein a defogging pad (231) is disposed inside an end of the defogging rod (23) not connected to the driving member, and the defogging rod (23) is connected to the defogging pad (231) by adhesive bonding.
8. An imaging dew point meter as claimed in claim 4, characterised in that cooling fins are provided on the camera (14) and the drive housing (22).
9. An imaging dew point meter as claimed in claim 1, characterised in that the control system comprises a control adapter plate (52), an electrical pin (51), a remote control host;
the heat dissipation system comprises a heat dissipation seat (41), and the heat dissipation seat (41) is provided with a cavity (411);
wherein the control adapter plate (52) is positioned in the cavity (411) and connected to the remote control host; the electric needle (51) is inserted into the cavity (411) and electrically connected with the control adapter plate (52), and the electric needle (51) is in insulated connection with the heat dissipation seat (41);
the electric needle (51) is also electrically connected with a photoelectric detection system and a condensation system; the cooling surface that refrigeration piece (35) was equipped with connect in heat-radiating seat (41).
CN202011620801.XA 2020-12-31 2020-12-31 Imaging dew point meter Active CN112858389B (en)

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JP2004538464A (en) * 2001-08-03 2004-12-24 ゼネラル・イースタン・インスツルメンツ，インコーポレイテッド Imaging device for gas analysis
CN204707185U (en) * 2015-06-29 2015-10-14 杭州海康威视数字技术股份有限公司 The anti-smog device of video camera and video camera
CN210690460U (en) * 2019-10-09 2020-06-05 广州西森自动化控制设备有限公司 Dew point instrument

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