CN211292582U - Gas chamber and light path structure for side-flow gas concentration monitoring device - Google Patents
Gas chamber and light path structure for side-flow gas concentration monitoring device Download PDFInfo
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- CN211292582U CN211292582U CN201921334000.XU CN201921334000U CN211292582U CN 211292582 U CN211292582 U CN 211292582U CN 201921334000 U CN201921334000 U CN 201921334000U CN 211292582 U CN211292582 U CN 211292582U
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Abstract
The utility model discloses an air chamber and light path structure for by-pass flow gas concentration monitoring devices, include: the infrared light source is arranged on the two sides of the air chamber respectively, and the optical filter is arranged outside the infrared sensor. The utility model discloses simple structure, easily production, anti-seismic performance are strong, the reliability is high, and with low costs. When the utility model is used, the respiratory waveform distortion is very small under the condition that the gas flow reaches 50ml/min, and the best effect is achieved.
Description
Technical Field
The utility model relates to a test technical field, in particular to an air chamber and light path structure for by-pass flow gas concentration monitoring devices.
Background
In the side-stream end-tidal carbon dioxide and anesthetic gas testing device, a gas chamber and a light path structure usually comprise a light source, and the gas chamber, an optical component and an infrared sensor part form a core unit for gas measurement. The gas to be measured passes through the gas sampling pipe and is pumped into a gas chamber through a vacuum pump, and the concentration of the gas is measured in the gas chamber through an infrared light source and an infrared detector. The accuracy with which the device measures the gas is therefore directly determined by the rationality of the structure of the chamber. In a clinical application environment where tidal volumes are small (e.g., neonates, infants, small animals), a bypass CO2 or multi-gas measurement device is required to have a smaller gas sampling flow rate as good as possible, and a 50ml/min gas sampling flow rate can meet clinical needs. In the case of a vacuum pump flow rate of 50ml/min, the larger the aperture area of the gas channel in the gas chamber is, the larger the distortion of the respiration waveform, particularly the distortion of the rising edge and the falling edge of the respiration waveform. In the case of a large distortion of the respiratory waveform, if the measured patient respiratory rate is high (greater than 60rpm), the error in the concentrations of the exhaled and inhaled gases measured by the device will be large, and such a device cannot be used in a clinical setting where tidal volumes are small.
The prior gas chamber has the following schemes in the aspect of the aperture area of the gas channel.
1. The aperture area of the channel is larger than or close to the area of the receiving unit of the infrared sensor, and the aperture is larger, so that the clinical environment of small tidal volume cannot be met.
2. An optical reflector or a spectroscope is added at the receiving end of the infrared sensor, the aperture area can be very small, the process requirement is high, the anti-seismic performance is poor, the optical structure is complex, the cost is high, and the reliability is low;
3. the optical temporary wave wheel is added at the receiving end of the infrared sensor, the aperture area can be small, but the structure is complex, the requirement of the production process is high, the anti-seismic performance is poor, the cost is high, and the reliability is low.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is to provide an air chamber and light path structure that are used for bypass flow gas concentration monitoring devices rational in infrastructure, easily production, anti-seismic performance is strong, the reliability is high and with low costs.
In order to solve the technical problem, the utility model discloses a technical scheme does:
a gas cell and optical path structure for a side-stream gas concentration monitoring device, comprising: the infrared window is arranged at each of two ends of the air chamber in a sealing mode, a gas channel is arranged inside the air chamber, the infrared sensors and the infrared light sources are located on two sides of the air chamber respectively, and the optical filter is arranged on the infrared sensors.
Preferably, the gas channel comprises a plurality of vent holes at the end part of the channel, and the plurality of gas channel holes are arranged at an included angle and/or in parallel.
Preferably, the number of the optical filters is multiple, the optical filters are respectively arranged corresponding to the gas channel holes, and the optical filters are respectively matched with the gas channel holes.
Preferably, the air chamber is provided with an air inlet and an air outlet, and the air inlet and the air outlet are respectively positioned on two sides and/or the same side of the air chamber.
Preferably, the infrared ray emitted by the infrared light source is 1um to 14 um.
Preferably, the gas channel comprises a gas inlet channel and a gas outlet channel, and the gas inlet channel and the gas outlet channel are respectively connected with the gas inlet hole and the gas outlet hole in a penetrating manner.
The beneficial effects of the utility model reside in that:
the utility model discloses rational in infrastructure, easily production, anti-seismic performance strong, no optical movable part, production technology require lowly, the reliability is high, and the cost is not high, the utility model discloses a very simple structure just can realize the small area in gas chamber gas aperture to realize gas sampling flow 50ml/min, under the 50ml/min circumstances of gas sampling flow, can prolong the life of gas sampling pipe, compare with 100ml/min, can make gas sampling pipe life-span increase 1 time.
Drawings
Fig. 1 is a structural diagram of an air chamber and an optical path structure for a side-stream gas concentration monitoring device of the present invention.
In the figure, 1-gas chamber, 2-infrared light source, 3-infrared sensor, 4-optical filter, 5-infrared window, 6-gas inlet, 7-gas outlet and 8-gas channel.
Detailed Description
The following describes the present invention with reference to the accompanying drawings. It should be noted that the description of the embodiments is provided to help understanding of the present invention, but the present invention is not limited thereto. In addition, the technical features related to the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
As shown in fig. 1, a gas cell and optical path structure for a side-stream gas concentration monitoring apparatus includes: air chamber 1, infrared light source 2, infrared sensor 3, light filter 4, the both ends of air chamber 1 are sealed respectively and are provided with infrared window 5, and the inside of air chamber 1 is equipped with gas passage 8, and infrared sensor 3, infrared light source 2 are located the both sides of air chamber 1 respectively, and light filter 4 sets up the outside at infrared sensor 3.
Specifically, in the present embodiment, the infrared sensor 3 converts the received infrared light into an electrical signal, and the infrared windows 5 are hermetically disposed at two ends of the gas chamber 1 and allow the infrared light to pass through the gas chamber 1.
In the preferred embodiment of the present invention, the gas channel 8 comprises a plurality of vent holes at the end of the channel, and the plurality of gas channels 8 are arranged in parallel and/or at an included angle.
Specifically, in this embodiment, the number of the gas channels 8 in the gas chamber 1 may be two or more, so as to implement multi-channel measurement, and the gas channels in the gas chamber 1 have a certain included angle or are parallel.
Specifically, in this embodiment, for a device with more than two channels, a method with a plurality of small apertures may also be used to realize a small aperture area of the gas channel. The holes in the gas chamber 1 are parallel or have a certain included angle, and mainly depend on the size of the output signal of the infrared sensor 3 and the noise level.
The present invention is provided with a plurality of optical filters 4, a plurality of optical filters 4 are respectively disposed corresponding to the plurality of gas channels, and a plurality of optical filters 4 are respectively matched with the plurality of gas channels 8.
The present invention has the preferred embodiment that the air chamber is provided with an air inlet 6 and an air outlet 7, and the air inlet 6 and the air outlet 7 are respectively located on both sides and/or the same side of the air chamber 1.
In the preferred embodiment of the present invention, the infrared ray emitted from the infrared light source 2 is 1um to 14 um.
Specifically, in the present embodiment, in the bypass CO2 or the gas measurement device, the porous gas passage 8 is used to realize a gas sampling flow rate of 50ml/min or less.
Specifically, in this embodiment, the gas to be measured enters the gas chamber from the gas inlet, and exits the gas chamber from the gas outlet along the arrow direction, and the infrared light emitted by the infrared light source enters the gas channel through the infrared window 5, and then reaches the optical filter through the infrared window, and enters the infrared sensor 3, and the infrared sensor 3 converts the optical signal into an electrical signal. Because the infrared sensor 3 is reached through the two light paths of the gas channel 8, the size of the optical filter 4 is required to be matched with that of the hole of the gas channel 8, so that the respiratory waveform distortion is very small under the condition that the gas flow reaches 50ml/min, and the optimal effect is achieved.
The present invention is provided with a gas inlet channel and a gas outlet channel in the preferred embodiment, wherein the gas inlet channel and the gas outlet channel are respectively connected with the gas inlet 6 and the gas outlet 7 in a penetrating manner.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the described embodiments. It will be apparent to those skilled in the art that various changes, modifications, substitutions and alterations can be made in the embodiments without departing from the principles and spirit of the invention, and the scope of the invention is to be accorded the full scope of the claims.
Claims (6)
1. A gas cell and optical path structure for a side-stream gas concentration monitoring device, comprising: the infrared light source is arranged on the two sides of the air chamber respectively, and the optical filter is arranged on the infrared sensor.
2. A gas cell and optical path structure for a by-pass gas concentration monitoring device according to claim 1, wherein the gas channel comprises a plurality of vent holes at the end of the channel, and the plurality of gas channel holes are arranged at an angle and/or in parallel.
3. A gas cell and optical path structure for a by-pass gas concentration monitor device according to claim 1, wherein said optical filter is plural, and plural optical filters are respectively disposed corresponding to plural gas passage holes, and plural optical filters are respectively matched with plural gas passage holes.
4. The gas chamber and light path structure for the side-stream gas concentration monitoring device according to claim 1, wherein the gas chamber is provided with a gas inlet and a gas outlet, and the gas inlet and the gas outlet are respectively located at two sides and/or the same side of the gas chamber.
5. The gas chamber and light path structure for the by-pass gas concentration monitoring device according to claim 1, wherein the infrared light emitted from the infrared light source is 1um to 14 um.
6. The gas chamber and light path structure for the side-stream gas concentration monitoring device according to claim 4, wherein the gas channel comprises a gas inlet channel and a gas outlet channel, and the gas inlet channel and the gas outlet channel are respectively connected with the gas inlet and the gas outlet in a penetrating manner.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921334000.XU CN211292582U (en) | 2019-08-16 | 2019-08-16 | Gas chamber and light path structure for side-flow gas concentration monitoring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921334000.XU CN211292582U (en) | 2019-08-16 | 2019-08-16 | Gas chamber and light path structure for side-flow gas concentration monitoring device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211292582U true CN211292582U (en) | 2020-08-18 |
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| CN201921334000.XU Active CN211292582U (en) | 2019-08-16 | 2019-08-16 | Gas chamber and light path structure for side-flow gas concentration monitoring device |
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| CN (1) | CN211292582U (en) |
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2019
- 2019-08-16 CN CN201921334000.XU patent/CN211292582U/en active Active
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