CN209979483U - Non-spectroscopic infrared gas sensor - Google Patents
Non-spectroscopic infrared gas sensor Download PDFInfo
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- CN209979483U CN209979483U CN201920362558.2U CN201920362558U CN209979483U CN 209979483 U CN209979483 U CN 209979483U CN 201920362558 U CN201920362558 U CN 201920362558U CN 209979483 U CN209979483 U CN 209979483U
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Abstract
The utility model discloses an infrared gas sensor of non-dispersive light, include: the porous cavity comprises a cavity surface and two ends connected with the cavity surface, wherein the cavity surface comprises a plurality of vent holes, and the two ends are provided with through holes; the infrared light emitting component is packaged with a collimating lens so that emitted light is emitted in parallel after passing through the collimating lens; and the infrared light receiving component comprises two detectors which are vertically packaged with each other. The utility model has the advantages that: the method of using the collimating lens to converge the light beams and vertically packaging the detector chip greatly improves the light energy utilization of the infrared absorption type sensor, greatly improves the performance of the sensor while realizing single-light-source double-light-path differential measurement, and reduces the volume of the sensor. The method is particularly suitable for occasions with high detection precision and requirements on the safety of the sensor.
Description
Technical Field
The utility model relates to a sensor technical field especially relates to a non-dispersive infrared gas sensor, in particular to non-dispersive infrared gas sensor based on infrared emitting diode.
Background
Non-dispersive infrared (NDIR) gas sensors use a broad spectrum light source as the light source for the infrared sensor, and light passes through the gas to be measured in the light path, through a narrow band filter, and to the infrared detector. The working principle of the gas sensing device is based on the characteristic that different gas molecules absorb infrared light with specific wavelength, and the gas sensing device is used for identifying gas components and determining the concentration of the gas components by utilizing the relation (Lambert-Beer Labert law) of gas concentration and absorption intensity. With the development of infrared light sources, sensors and electronic technologies, non-dispersive infrared (NDIR) gas sensors have been rapidly developed at home and abroad.
Conventional NDIR gas sensors typically include a body portion that is formed from an infrared light source, an infrared receiver, and a getter chamber. The gas chamber is generally a tubular coated optical cavity and is used for restraining infrared light emitted by the light source to enable the light to reach the detector as much as possible, and the signal-to-noise ratio of the sensor is improved by improving the signal intensity. However, this structure is not problematic when used in a tube-in-tube infrared gas sensor. However, when used in a diffusion gas sensor, there is a problem in that several rows of air holes need to be formed in the light pipe. If the vent hole is large, the constraint performance of the cavity on light is reduced, and light leakage is serious; if the vent hole is small, the gas diffusion will be slow, and the response time will be seriously affected. In addition, the two detectors of the conventional differential structure are placed side by side, so that the position where the light energy is strongest at the two detectors cannot be utilized, thereby affecting the signal-to-noise ratio of the sensor.
SUMMERY OF THE UTILITY MODEL
To the shortcoming of above-mentioned prior art, the utility model aims at providing a non-dispersive infrared gas sensor of high infrared light energy utilization ratio improves the utilization of detector to the light energy under the circumstances of guaranteeing higher gas diffusion efficiency to promote the SNR of sensor.
In order to solve the technical problem, the utility model discloses a following technical scheme:
the utility model provides a non-dispersive infrared gas sensor, include:
the porous cavity comprises a cavity surface and two ends connected with the cavity surface, wherein the cavity surface comprises a plurality of vent holes for realizing gas diffusion, and the two ends are provided with through holes;
a circuit board, further, the circuit board comprising:
the photodiode pulse driving circuit is connected with the infrared light emitting component and is used for driving the light source to emit light;
the signal conditioning circuit is connected with the infrared light receiving component and used for amplifying and filtering emergent light signals;
and the main control circuit is arranged at the bottom of the porous cavity, realizes A/D conversion and data processing of emergent light signals and reads out a gas concentration value.
And the infrared light emitting component is packaged with a first collimating lens, so that the emitted light is emitted in parallel after passing through the first collimating lens.
Further, the infrared light emitting part includes:
a first base;
the infrared diode light-emitting chip is arranged in the center of the base and releases emitted light;
one end of the first transistor shell is connected with one side of the first base, which is provided with the infrared diode light-emitting chip;
the first collimating lens is arranged at the other end of the first transistor shell;
and the first pin is arranged on the other side of the first base.
Furthermore, the first collimating lens end of the infrared light emitting component is embedded into the through hole at one end of the porous cavity.
An infrared light receiving part including two detectors packaged perpendicular to each other.
Further, the infrared light receiving part includes:
a second base;
the light splitting bracket is used for realizing filtering processing and detection of emergent light;
one end of the second transistor shell is connected with one side of the second base, which is provided with the light splitting bracket;
the second collimating lens is arranged at the other end of the second transistor shell;
and the second pin is arranged on the other side of the second base.
Furthermore, the second collimating lens end of the infrared light receiving component is embedded into the through hole at the other end of the porous cavity.
Wherein, include on the spectral support:
the first optical filter is parallel to the second base and used for receiving the emergent light, and the first optical filter penetrates through a specific waveband of the emergent light and reflects other wavebands of the emergent light;
the second optical filter and the second base form an angle of 45 degrees, and the second optical filter receives the light of the wave band transmitted by the first optical filter and transmits and reflects the light again;
the first detector is parallel to the second base, receives the light transmitted by the second optical filter and serves as signal light;
and the second detector is vertical to the second base, and receives the light reflected by the second optical filter as reference light.
Furthermore, the bandwidth of the first filter is greater than and includes the frequency band of the second filter.
Furthermore, the bandwidth range of the first optical filter is larger than the range of the spectrum absorbed by the gas to be detected, and the central wavelength of the second optical filter corresponds to the infrared characteristic absorption peak of the gas to be detected.
Still further, the infrared light receiving part is also provided with a temperature sensor to realize temperature compensation.
Compared with the prior art, the utility model discloses the infrared gas sensor of non-splitting who obtains is in the same place two detector vertical packaging, and the light branch that assembles by lens becomes two bundles and reaches the detector surface respectively to realize the utilization efficiency of higher light energy. The collimating lens packaged on the infrared light emitting component enables the light beams to almost parallelly reach the receiving end without the restraint of the air chamber, so that the contradiction between the gas diffusion speed and the light restraint capability is solved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive effort.
FIG. 1 is a schematic diagram of the overall structure of a non-dispersive infrared gas sensor according to an embodiment of the present invention;
fig. 2 is a schematic view of an infrared light emitting component according to an embodiment of the present invention;
fig. 3 is an internal structure view of an infrared light receiving unit according to an embodiment of the present invention;
fig. 4 is a view of the structure of the spectrometer holder according to the embodiment of the present invention.
In the figure:
infrared light emitting component 100 infrared light receiving component 101 porous cavity 103
Through hole 104 of vent 102 base 201, 208 pins 202, 209
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
The embodiments of the present invention will be described in further detail with reference to the drawings attached to the specification.
An embodiment of the utility model provides a non-dispersive infrared gas sensor, as shown in FIG. 1, include:
a porous cavity 103 including a cavity surface and two ends connected to the cavity surface, wherein the cavity surface includes a plurality of vent holes 102 for realizing gas diffusion, and the two ends have through holes 104;
the infrared light emitting component 100, a collimating lens 302 is packaged on the infrared light emitting component 100, so that the emitted light is emitted in parallel after passing through the collimating lens 302;
and an infrared light receiving part 101 including two detectors packaged perpendicular to each other.
In this embodiment, the infrared light emitting component 100, the infrared light receiving component 101, and the porous cavity 103 are connected into a whole, and infrared light emitted by the infrared diode light emitting chip in the infrared light emitting component 100 passes through the porous cavity 103 after being shaped by the collimating lens, and finally enters the infrared light receiving component 101.
In some embodiments, referring to fig. 2, the infrared light emitting component 100 includes:
a base 201;
an infrared diode light emitting chip 303 disposed in the center of the base 201 for releasing emitted light;
a transistor casing (i.e. a TO case) 301, wherein one end of the TO case 301 is connected with one side of the base 201, which is provided with an infrared diode light-emitting chip 303;
the collimating lens 302 is arranged at the other end of the TO tube shell 301;
and a pin 202 disposed at the other side of the base 201.
Further, referring to fig. 1 and 2, the collimating lens end of the infrared light emitting component 100 is inserted into one end through hole 104 of the porous cavity 103.
In this embodiment, the infrared light emitting component 100 is composed of an infrared diode light emitting chip 303, a TO package 301, and a collimating lens 302, the infrared diode light emitting chip 303 is located at the center of the base, and emits pulse or continuous light under the driving of the driving circuit, and the light beam is shaped by the collimating lens 302 and then exits approximately in parallel.
In some embodiments, referring to fig. 3 and 4, the infrared light receiving part includes:
a base 208;
the light splitting bracket 204 is used for realizing filtering processing and detection of emergent light;
a TO package (not shown) with one end positioned TO interface with the side of the base 208 having the light splitting support 204;
a collimating lens (not shown) disposed at the other end of the TO envelope;
and a pin 209 disposed on the other side of the base 208.
Further, referring to fig. 1, the collimating lens end of the infrared light receiving component 101 is inserted into the through hole 104 at the other end of the porous cavity 103.
The light splitting bracket 204 in the infrared light receiving component includes:
a first optical filter 205, the first optical filter 205 being parallel to the base 208 and receiving the outgoing light, the first optical filter 205 transmitting a specific waveband of the outgoing light and reflecting other wavebands of the outgoing light;
a second filter 203, wherein the angle between the second filter 203 and the base 208 is 45 degrees, and the second filter 203 receives the light of the wavelength band transmitted by the first filter 205 and transmits and reflects the light again;
a first detector 207, the first detector 207 being parallel to the base 208, receiving the light transmitted by the second filter 203 as signal light;
and a second detector 206, wherein the second detector 206 is perpendicular to the base 208 and receives the light reflected by the second filter 203 as reference light.
In some embodiments, infrared light receiving section 101 further has a temperature sensor.
In this embodiment, the infrared light receiving component 101 is a TO package detector assembly, and is composed of a TO case (not shown), a base 208, a light splitting support 204, a pin 209, a collimating lens (not shown), a temperature sensor (not shown), optical filters 203 and 205, and detector chips 206 and 207, where the temperature sensor and the light splitting support are fixed TO the base, the detector chips are respectively fixed TO the base and the inner wall of the TO case and located behind the optical filters, the optical filters are fixed TO the light splitting support, and light entering the lens is converged on the two detectors 206 and 207 after passing through the two optical filters, and is characterized in that a focus of the collimating lens is located at the center of the first detector 207, and the light splitting support 204 makes the first optical filter 205 and the second optical filter 203.
Based on the above embodiment, the infrared light entering the collimating lens is converged to the first optical filter 205, the first optical filter 205 allows the light of a specific wavelength band to pass through to the second optical filter 203 and reflects the light of other wavelength bands, further allows the infrared feature absorption light corresponding to the gas to be detected to pass through and reach the first detector 207 as the signal light, and the infrared light that does not pass through the second optical filter 203 is reflected to enter the second detector 206 as the reference light.
In some embodiments, the bandwidth of the first filter 205 is greater than and includes the frequency band of the second filter 203;
the bandwidth range of the first optical filter 205 is larger than the range of the spectrum absorbed by the gas to be detected, and the central wavelength of the second optical filter 203 corresponds to the infrared characteristic absorption peak of the gas to be detected.
In this embodiment, the window of the first optical filter 205 is larger than and includes the window of the second optical filter 203, the bandwidth and the central wavelength of the second optical filter 203 are determined according to the characteristic peak corresponding to the gas to be detected, the determination method is that the central wavelength of the second optical filter 203 corresponds to the characteristic absorption peak of the gas, and the bandwidth of the first optical filter 205 includes the spectrum which is not absorbed by the gas.
In the above embodiment, the first detector chip 207 is mounted on the center of the base 201 and aligned with the rectangular through hole of the spectroscopic support 204, and the rectangular through hole is perpendicular to the position of the second optical filter 203.
In other embodiments, the beam splitting support 204 may be designed in other shapes, but its optical path is unchanged.
In some embodiments, the non-dispersive infrared gas sensor further comprises a circuit board comprising:
a photodiode pulse driving circuit connected to the infrared light emitting part 100 for driving the light source to emit light;
the signal conditioning circuit is connected with the infrared light receiving component 101 and used for amplifying and filtering emergent light signals;
and the main control circuit is arranged at the bottom of the porous cavity 103, realizes A/D conversion and data processing of emergent light signals and reads out a gas concentration value.
In this embodiment, vent holes 102 are distributed on the porous cavity 103, the bottom of the porous cavity is used for connecting with a main control circuit board, two ends of the porous cavity are used for fixing the infrared light emitting component 100 and the infrared light receiving component 101, and the size of the circular through hole 104 is respectively matched with the size of the TO outer shells of the infrared light emitting component 100 and the infrared light receiving component 101, so that the infrared light emitting component 100 and the infrared light receiving component 101 are just embedded therein.
Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention and not to limit it; although the present invention has been described in detail with reference to preferred embodiments, it should be understood by those skilled in the art that: the invention can be modified or equivalent substituted for some technical features; without departing from the spirit of the present invention, it should be understood that the scope of the claims is intended to cover all such modifications and variations.
Claims (10)
1. A non-dispersive infrared gas sensor, comprising:
the porous cavity comprises a cavity surface and two ends connected with the cavity surface, the cavity surface comprises a plurality of vent holes, and the two ends are provided with through holes;
the infrared light emitting component is packaged with a first collimating lens, so that emitted light is emitted in parallel after passing through the first collimating lens;
and the infrared light receiving part comprises two detectors which are vertically packaged with each other.
2. The non-dispersive infrared gas sensor according to claim 1, further comprising a circuit board, the circuit board comprising:
the photodiode pulse driving circuit is connected with the infrared light emitting component and is used for driving the light source to emit light;
the signal conditioning circuit is connected with the infrared light receiving component and used for amplifying and filtering emergent light signals;
and the master control circuit is arranged at the bottom of the porous cavity and used for realizing A/D conversion and data processing and reading of the emergent light signals.
3. The non-dispersive infrared gas sensor according to claim 1, wherein the infrared light emitting section comprises:
a first base;
the infrared diode light-emitting chip is arranged in the center of the first base and releases emitted light;
one end of the first transistor shell is connected with one side of the first base, which is provided with the infrared diode light-emitting chip;
the first collimating lens is arranged at the other end of the first transistor shell;
and the first pin is arranged on the other side of the first base.
4. The non-dispersive infrared gas sensor according to claim 3, wherein the first collimating lens end of the infrared light emitting member is embedded in an end through hole of the porous cavity.
5. The non-dispersive infrared gas sensor according to claim 1, wherein the infrared light receiving part comprises:
a second base;
the light splitting bracket is used for realizing filtering processing and detection of emergent light;
one end of the second transistor shell is connected with one side, provided with the light splitting support, of the second base;
the second collimating lens is arranged at the other end of the second transistor shell;
and the second pin is arranged on the other side of the second base.
6. The non-dispersive infrared gas sensor according to claim 5, wherein the spectroscopic support comprises thereon:
the first optical filter is parallel to the second base and used for receiving the emergent light, and the first optical filter penetrates through a specific waveband of the emergent light and reflects other wavebands of the emergent light;
the second optical filter and the second base form an angle of 45 degrees, and the second optical filter receives the light of the wave band transmitted by the first optical filter and transmits and reflects the light again;
the first detector is parallel to the second base, receives the light transmitted by the second optical filter and serves as signal light;
and the second detector is vertical to the second base, and receives the light reflected by the second optical filter as reference light.
7. The non-dispersive infrared gas sensor according to claim 5, wherein the second collimating lens end of the infrared light receiving member is embedded in the other end through hole of the porous cavity.
8. The non-dispersive infrared gas sensor according to claim 6, wherein the bandwidth of the first filter is greater than and encompasses the frequency band of the second filter.
9. The non-dispersive infrared gas sensor according to claim 6 or 8, wherein the bandwidth range of the first filter is larger than the range of the spectrum absorbed by the gas to be detected, and the central wavelength of the second filter corresponds to the infrared characteristic absorption peak of the gas to be detected.
10. The non-dispersive infrared gas sensor according to claim 1 or 5, wherein the infrared light receiving part is further provided with a temperature sensor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920362558.2U CN209979483U (en) | 2019-03-20 | 2019-03-20 | Non-spectroscopic infrared gas sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920362558.2U CN209979483U (en) | 2019-03-20 | 2019-03-20 | Non-spectroscopic infrared gas sensor |
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| Publication Number | Publication Date |
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| CN209979483U true CN209979483U (en) | 2020-01-21 |
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| CN201920362558.2U Active CN209979483U (en) | 2019-03-20 | 2019-03-20 | Non-spectroscopic infrared gas sensor |
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