CN211013929U - High-sensitivity oil smoke concentration measuring device - Google Patents
High-sensitivity oil smoke concentration measuring device Download PDFInfo
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- CN211013929U CN211013929U CN201921323570.9U CN201921323570U CN211013929U CN 211013929 U CN211013929 U CN 211013929U CN 201921323570 U CN201921323570 U CN 201921323570U CN 211013929 U CN211013929 U CN 211013929U
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- 239000000779 smoke Substances 0.000 title claims abstract description 30
- 239000003990 capacitor Substances 0.000 claims description 9
- 238000005259 measurement Methods 0.000 claims description 8
- 230000035945 sensitivity Effects 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 4
- 239000004071 soot Substances 0.000 claims description 4
- 230000003287 optical effect Effects 0.000 claims description 3
- 239000006233 lamp black Substances 0.000 claims 8
- 230000004907 flux Effects 0.000 abstract description 5
- 238000010586 diagram Methods 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 230000001678 irradiating effect Effects 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Abstract
The utility model discloses a high-sensitivity oil smoke concentration measuring device, which comprises a transmitting unit, a receiving unit and a transmitting and receiving circuit; the transmitting unit comprises a transmitting cavity, a transmitting opening, a curved surface reflector, a convex lens and a transmitting tube are arranged in the transmitting cavity, the curved surface reflector is of a paraboloid of revolution structure with an opening facing the transmitting opening at the top, the transmitting tube faces the focus of the paraboloid of revolution structure, the convex lens is arranged between the transmitting tube and the focus, and light rays transmitted by the transmitting tube pass through the focus; the receiving unit is used for receiving signals and transmitting the signals to the transmitting and receiving circuit; the transmitting and receiving circuit amplifies the electric signal through the operational amplifier circuit and then analyzes the electric signal. The utility model discloses utilize convex lens to improve the utilization ratio of light, can set up a plurality of transmitting tubes and produce parallel light beam through the curved surface speculum, improved luminous flux, reduced ambient light to measuring influence, reduced the requirement to the operational circuit, the cost is reduced has improved the precision of measuring oil smoke concentration.
Description
Technical Field
The utility model relates to a range hood technical field, concretely relates to high sensitivity oil smoke concentration measurement device.
Background
The range hood automatically adjusts the air quantity by measuring the oil smoke concentration, and because the oil smoke concentration of the range hood is very low, only a few milligrams per cubic meter and the resolution of the existing scheme is very low, the smoke concentration is difficult to distinguish effectively. The existing oil smoke concentration detection technology adopting an infrared mode is limited in the minimum value of the detected oil smoke concentration due to the influence of ambient light, and the requirements on a circuit and an amplification chip are very high because a reflection signal is very weak. And current transmitting circuit and receiving circuit need set up respectively in transmitting tube and receiving tube, are unfavorable for the production to overhaul. The existing emission unit only can be provided with a small number of emission tubes in the emission unit because the size of the emission opening needs to be limited in a small range, and a light source is wasted due to light divergence, only partial light which points to the emission opening vertically can pass through the emission opening, and the luminous flux is low.
SUMMERY OF THE UTILITY MODEL
In order to overcome the problems existing in the prior art, the main object of the utility model is to provide a high sensitivity oil smoke concentration measuring device.
In order to achieve the above object, the utility model discloses specifically adopt following technical scheme:
the utility model provides a high sensitivity oil smoke concentration measurement device, include:
the transmitting unit is used for transmitting infrared rays and is provided with a transmitting cavity, and a curved reflector, a convex lens and a transmitting tube are arranged in the transmitting cavity; the top of the emission cavity is provided with an emission port, and the curved surface reflector is of a paraboloid of revolution structure with an opening facing the emission port; the axis direction of the emission tube faces to the focus of the paraboloid of revolution structure, the convex lens is arranged between the emission tube and the focus, the light emitting point of the emission tube is positioned between one focal length and two focal lengths of the convex lens, and the light rays emitted by the emission tube pass through the focus;
the receiving unit is provided with a receiving port and a receiving tube and is used for converting the received optical signals into electric signals and transmitting the electric signals to the transmitting and receiving circuit;
the transmitting and receiving circuit comprises a receiving circuit and a transmitting circuit, the receiving circuit amplifies and analyzes the electric signal of the receiving unit through an operational amplifier circuit, and the transmitting circuit is connected with an external driving circuit and drives the transmitting tube by adopting pulses with the same duty ratio;
the transmitting unit and the receiving unit are arranged in an inclined angle, and the width of a receiving opening of the receiving unit is matched with that of the transmitting opening.
Furthermore, the number of the emission tubes is multiple, and the number of the convex lenses is matched with that of the emission tubes.
Further, the launching tubes are symmetrically distributed in the launching cavity.
Further, the distance between the outermost edge of the curved reflector and the axis of the paraboloid of revolution structure is 1mm-5 mm.
Further, the width of the emitting opening is in the range of 2mm-1 cm.
Further, the housing of the transmitting unit and the housing of the receiving unit are made of light-tight materials.
Furthermore, the transmitting tube comprises a first transmitting tube and a second transmitting tube, the first transmitting tube adopts a first infrared emitting diode, the second transmitting tube adopts a second infrared emitting diode, the receiving tube adopts an infrared receiving triode, and the transmitting circuit comprises a first transmitting tube circuit and a second transmitting tube circuit.
Further, first transmitting tube circuit includes first resistance and first triode, the termination power VCC of first resistance, the other termination of first resistance is the positive pole of the first infrared emitting diode, the negative pole of first infrared emitting diode connects the collecting electrode of first triode, the projecting pole ground connection of first triode, the base of first triode connects external drive circuit.
Further, the second transmitting tube circuit comprises a second resistor and a second triode, wherein one end of the second resistor is connected with a power VCC, the other end of the second resistor is connected with the anode of a second infrared emitting diode, the cathode of the second infrared emitting diode is connected with the collector of the second triode, the emitting electrode of the second triode (Q2) is grounded, and the base of the second triode is connected with the external driving circuit.
Furthermore, the receiving circuit comprises a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, a capacitor and a chip, wherein a collector of the infrared receiving triode is connected with a power supply VCC, an emitter of the infrared receiving triode is grounded through the third resistor, meanwhile, an emitter of the infrared receiving triode is also connected with a + IN A pin of the chip, a-INA pin of the chip is grounded through the sixth resistor, an OUT A pin of the chip is connected with one end of the fifth resistor, one end of the seventh resistor and one end of the capacitor, the other end of the fifth resistor and the other end of the capacitor are respectively connected with the-IN A pin of the chip, and the other end of the seventh resistor is connected with the + IN B pin of the chip and serves as an output end AD 1; the V + pin of the chip is connected with a power supply VCC, and the V-pin of the chip is grounded; the-IN B pin of the chip is grounded through an eighth resistor, the-IN B pin of the chip is connected with the OUT B pin of the chip through a ninth resistor, and the OUT B pin of the chip is used as an output end AD2 through a tenth resistor.
The technical effects of the utility model are that: through the reflection of curved surface speculum and setting up a plurality of transmitting tubes and convex lens, the luminous flux of transmitting light has significantly been improved to improved measurement accuracy, adopt simultaneously adiactinic material preparation infrared emission unit and receiving element, reduced ambient light to the influence of measuring, improved the minimum of measuring oil smoke concentration. And the requirement on an operational amplifier circuit can be reduced by improving the intensity of emitted light, so that the cost is reduced. Meanwhile, the transmitting circuit and the receiving circuit are independently put together, so that a circuit module is conveniently and intensively produced, and when the circuit module breaks down, the whole transmitting tube or the whole receiving tube does not need to be replaced.
Drawings
Fig. 1 is an enlarged structure view of an emission unit of a high-sensitivity oil smoke concentration measuring device provided in an embodiment of the present invention;
fig. 2 is a structural diagram of a high-sensitivity oil smoke concentration measuring device provided by the embodiment of the present invention;
fig. 3 is a schematic circuit diagram of the first transmitting tube 111 according to the embodiment of the present invention;
fig. 4 is a schematic circuit diagram of the second transmitting tube 112 according to the embodiment of the present invention;
fig. 5 is a schematic diagram of a receiving circuit according to an embodiment of the present invention.
Description of the drawings:
1-a transmitting unit: 11-transmitting tube: first and second emission tubes 111 and 112: 12-convex lens, 13-curved reflector, 14-emission cavity, 15-emission opening;
2-a receiving unit: 21-receiving port, 22-receiving tube;
3-a transmitting and receiving circuit: 31-receiving circuit, 32-transmitting circuit.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The embodiment of the utility model provides a high sensitivity oil smoke concentration measurement device, include:
the transmitting unit 1 is used for transmitting infrared rays and comprises a transmitting cavity 14, and a curved reflector 13, a convex lens 12 and a transmitting tube 11 are arranged in the transmitting cavity; the top of the emission cavity 14 is provided with an emission port 15, and the curved reflector 13 is of a paraboloid of revolution structure with an opening facing the emission port 15; the axial direction of the emission tube 11 faces to the focus of the paraboloid of revolution structure, the convex lens 12 is arranged between the emission tube 11 and the focus, the light emitting point of the emission tube 11 is located between the focal length of one time and the focal length of two times of the convex lens 12, and the light emitted by the emission tube 11 passes through the focus.
In the emitting unit 1, the convex lens 12 can make the parts of the light emitted by the emitting tube 11, which irradiate the convex lens 12, converge, so that the utilization rate of the light is improved; and the light converges on the focus of the paraboloid of revolution and continues to propagate along a straight line, which is equivalent to the light emitted by the point light source at the focus, the light continues to propagate to the curved surface reflector 13 after passing through the focus of the paraboloid of revolution, the paraboloid of revolution structure of the curved surface reflector 13 can reflect the light into parallel light beams, and the parallel light beams are finally emitted out from the emission port 15 through the emission cavity 14, and the light falls in the curved surface reflector 13 to be less than 5mm away from the axis of the paraboloid of revolution structure through reasonably adjusting the relative positions of the emission tube 11, the convex lens 12 and the curved surface reflector 13, so that the parallel light beams with smaller radius can be generated, and the requirement of the infrared emission unit 1 for parallel thin light beams with high luminous flux is met. Meanwhile, since the emission tube 11 has a structure of obliquely illuminating the curved surface reflecting mirror 13, it means that a plurality of emission tubes 11 can be provided in the emission unit 1 to operate simultaneously, so that the intensity of the emitted light can be improved.
And the receiving unit 2 is provided with a receiving port 21 and a receiving tube 22 and is used for converting the received optical signals into electric signals and transmitting the electric signals to the transmitting and receiving circuit 3.
The transmitting and receiving circuit 3 comprises a receiving circuit 31 and a transmitting circuit 32, the receiving circuit 31 amplifies and analyzes the electric signal of the receiving unit 2 through an operational amplifier circuit, and the transmitting circuit 32 is connected with an external driving circuit to drive the transmitting tube 11 by adopting pulses with the same duty ratio. The transmitting circuit 32 and the receiving circuit 31 are separately put together, so that a circuit module is conveniently and integrally produced, and when the circuit module fails, the whole transmitting tube 11 or receiving tube 22 does not need to be replaced.
The transmitting unit 1 and the receiving unit 2 are arranged at an inclination angle, and the width of the receiving opening 21 of the receiving unit 2 is matched with the width of the transmitting opening 15. In the specific embodiment, the emitting unit 1 and the receiving unit 2 are arranged at an inclination angle of 140 degrees to ensure that the light emitted by the emitting unit 1 can reach the receiving unit 2 through the diffuse reflection of the oil smoke particles, and the width of the receiving opening 21 is matched with the width of the emitting opening 15 to ensure that the light received by the receiving opening is the reflected light generated by the reflection of the light emitted by the emitting unit 1 through the surface parallel to the same surface of the oil smoke particles.
When the light is emitted for a certain time, the diffuse reflection light intensity generated by the emitted light through the oil smoke is in a proportional relation with the concentration of the oil smoke, and the electric signal generated by the receiving unit 2 is in a proportional relation with the received light intensity. The voltage of the oil smoke is amplified through the sampling resistor, and the output voltage is related to the concentration of the oil smoke.
The corresponding formula: output voltage-input voltage-voltage gain
Input voltage K1 reflected light intensity
Reflected light intensity K2 oil smoke concentration emitted light intensity
Therefore, the output voltage is in direct proportion to the emission light intensity, and when the emission light intensity is fixed, the output voltage is in direct proportion to the oil smoke concentration. The transmitting and receiving circuit 3 analyzes the output voltage to obtain a corresponding oil smoke concentration value. The infrared transmitting unit 1 and the receiving unit 2 form a certain inclination angle, so that the light rays emitted by the infrared transmitting unit 1 can reach the receiving unit 2 after being reflected by the oil smoke particles. The plurality of transmitting tubes 11 are driven by pulses with the same duty ratio, when the transmitting tubes 11 are closed, the measuring output voltage is V0, and when the transmitting tubes 11 are conducted, the measuring output voltage is V1; the magnitude of V0 is related to the dark current of the ambient light and the receiver tube 22, and the greater the soot concentration, the greater the reflected light, so the magnitude of V1 increases with increasing soot concentration. When V2 is equal to V1-V0, the size of V2 is proportional to the concentration of soot. When the ambient light changes, it will cause V0 to change. The larger the V2 corresponding to the unit concentration, the smaller the influence of the change in V0 on the measurement accuracy. The influence of ambient light is smaller when the intensity of the emitted light is larger. Under the same environment light, the gain multiple required by the full amplitude of the output voltage corresponding to the maximum oil smoke concentration is reduced, namely, the gain requirement on the operational amplifier is reduced, namely, the operational amplifier with lower requirement can be used to meet the requirement, and the cost is reduced.
The utility model discloses specific embodiment, launching tube 11 can set up a plurality ofly, and the embodiment that fig. 1 shows is two, including first launching tube 111 and second launching tube 112, first launching tube 111 and second launching tube 112 are in launching chamber 14 internal symmetry distribution. The symmetrically distributed transmitting tubes 11 can form uniform parallel beams, so that the measurement is more accurate. The number of convex lenses 12 matches the number of emission tubes 11. The plurality of emission tubes 11 operate simultaneously and are not affected by the need for small beams through the emission openings 15, significantly increasing the light flux through the emission openings 15.
As shown in fig. 3, the first emitting tube 111 is a first infrared emitting diode D1, the circuit further includes a first resistor R1 and a first transistor Q1, one end of the first resistor R1 is connected to the VCC, the other end of the first resistor R1 is connected to the anode of the first infrared emitting diode D1, and the cathode of the first infrared emitting diode D1 is connected to the collector of the first transistor Q1. The emitter of the first triode Q1 is grounded, and the base of the first triode Q1 is connected with an external driving circuit.
As shown in fig. 4, the second emitting tube 112 adopts a second infrared emitting diode D2, the circuit further includes a second resistor R2 and a second triode Q2, one end of the second resistor R2 is connected to the VCC, the other end of the second resistor R2 is connected to the anode of the second infrared emitting diode D2, and the cathode of the second infrared emitting diode D2 is connected to the collector of the second triode Q2. The emitter of the second triode Q2 is grounded, and the base of the second triode Q2 is connected with an external driving circuit. Thereby produce 50% duty cycle pulse signal through external drive circuit and drive first infrared diode D1 and second infrared diode D2 and shine and do not give out light jointly simultaneously to guarantee that emission tube 11 adopts unified work interval, the light that receiving element 2 received is diffuse reflection light when emission tube 11 during operation and the ambient light when emission tube 11 is out of work respectively, and both contrast has got rid of the interference of ambient light as far as.
As shown in fig. 5, the receiving circuit 31 is an infrared receiving triode Q3, and the receiving circuit 22 includes a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, a capacitor C1, and a chip U1; the collector of the infrared receiving triode Q3 is connected with a power supply VCC, the emitter of the infrared receiving triode Q3 is grounded through a third resistor R3, and the emitter of the infrared receiving triode Q3 is also connected with the + IN A pin of the chip U1. the-IN A pin of the chip U1 is grounded through a sixth resistor R6, the OUT A pin of the chip U1 is connected with one end of a fifth resistor R5, one end of a seventh resistor R7 and one end of a capacitor C1, the other end of the fifth resistor R5 and the other end of the capacitor C1 are respectively connected with the-IN A pin of the chip U1, and the other end of the seventh resistor R7 is connected with the + IN B pin of the chip U1 and serves as an output end AD 1; the V + pin of the chip U1 is connected with a power supply VCC, and the V-pin of the chip U1 is grounded; the pin-IN B of the chip U1 is grounded through an eighth resistor R8, the pin-IN B of the chip U1 is connected with the pin-OUT B of the chip U1 through a ninth resistor R9, and the pin-OUT B of the chip U1 is used as an output terminal AD2 through a tenth resistor R10.
The type of the chip U1 is AD8629, the receiving circuit 31 adopts two-stage operational amplifier, the first-stage operational amplifier is used as direct light output, namely an output end AD 1; the output of the second-stage operational amplifier is output as reflected light, namely an output end AD 2; the operational amplifier adopts high input impedance, low zero drift and low noise operational amplifier. Since the receiving unit 2 has a very large difference in light intensity when receiving the reflected light and the ambient light, and when receiving only the ambient light, passes through the amplifying circuits of different scales so as to receive the processing.
The distance between the outermost edge of the light irradiating the curved surface reflector 13 and the axis of the revolution paraboloid structure is within the range of 1mm-5 mm. The reflected light beam formed by irradiating the curved surface reflector 13 has smaller caliber, and can pass through a small-caliber emission port 15 required by infrared measurement of the oil smoke concentration.
The width of the emission port 15 is in the range of 2mm-1 cm. Because the oil smoke particles are small, the needed light beams do not need to be thick, and the transmitting opening 15 only needs to be small in caliber.
The housings of the transmitting unit 1 and the receiving unit 2 are made of a material that is opaque to light. This ensures that as much infrared light as possible is received by the receiving unit 2 from the infrared transmitting unit 1, further reducing the influence of ambient light.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention should be covered by the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A high sensitivity oil smoke concentration measurement device, its characterized in that includes:
the transmitting unit is used for transmitting infrared rays and is provided with a transmitting cavity, and a curved reflector, a convex lens and a transmitting tube are arranged in the transmitting cavity; the top of the emission cavity is provided with an emission port, and the curved surface reflector is of a paraboloid of revolution structure with an opening facing the emission port; the axis direction of the emission tube faces to the focus of the paraboloid of revolution structure, the convex lens is arranged between the emission tube and the focus, the light emitting point of the emission tube is positioned between one focal length and two focal lengths of the convex lens, and the light rays emitted by the emission tube pass through the focus;
the receiving unit is provided with a receiving port and a receiving tube and is used for converting the received optical signals into electric signals and transmitting the electric signals to the transmitting and receiving circuit;
the transmitting and receiving circuit comprises a receiving circuit and a transmitting circuit, the receiving circuit amplifies and analyzes the electric signal of the receiving unit through an operational amplifier circuit, and the transmitting circuit is connected with an external driving circuit and drives the transmitting tube by adopting pulses with the same duty ratio;
the transmitting unit and the receiving unit are arranged in an inclined angle, and the width of a receiving opening of the receiving unit is matched with that of the transmitting opening.
2. The high-sensitivity lampblack concentration measuring device according to claim 1, wherein the number of the emission tubes is multiple, and the number of the convex lenses is matched with the number of the emission tubes.
3. The high-sensitivity lampblack concentration measuring device according to claim 2, wherein the emission tubes are symmetrically distributed in the emission cavity.
4. A high sensitivity soot concentration measuring device as claimed in claim 3, wherein the distance between the outermost edge of said light beam striking said curved reflector and the axis of said paraboloid of revolution structure is in the range of 1mm-5 mm.
5. The high-sensitivity lampblack concentration measuring device according to claim 4, wherein the width of the emission opening is in the range of 2mm-1 cm.
6. The high-sensitivity lampblack concentration measuring device according to any one of claims 1 to 5, wherein shells of the transmitting unit and the receiving unit are made of light-tight materials.
7. The high-sensitivity lampblack concentration measuring device according to claim 2, wherein the transmitting tube comprises a first transmitting tube and a second transmitting tube, the first transmitting tube adopts a first infrared emitting diode, the second transmitting tube adopts a second infrared emitting diode, the receiving tube adopts an infrared receiving triode, and the transmitting circuit comprises a first transmitting tube circuit and a second transmitting tube circuit.
8. The high-sensitivity lampblack concentration measuring device according to claim 7, wherein the first transmitting tube circuit comprises a first resistor and a first triode, one end of the first resistor is connected with a VCC (voltage conduction center), the other end of the first resistor is connected with the anode of a first infrared emitting diode, the cathode of the first infrared emitting diode is connected with the collector of the first triode, the emitter of the first triode is grounded, and the base of the first triode is connected with an external driving circuit.
9. The high-sensitivity lampblack concentration measuring device according to claim 8, wherein the second transmitting tube circuit comprises a second resistor and a second triode, one end of the second resistor is connected with a VCC (voltage continuity), the other end of the second resistor is connected with the anode of a second infrared emitting diode, the cathode of the second infrared emitting diode is connected with the collector of the second triode, the emitter of the second triode is grounded, and the base of the second triode is connected with the external driving circuit.
10. The high-sensitivity lampblack concentration measuring device according to claim 7, the receiving circuit comprises a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, a capacitor and a chip, the collector of the infrared receiving triode is connected with a power VCC, the emitter of the infrared receiving triode is grounded through a third resistor, meanwhile, the emitter of the infrared receiving triode is also connected with the + IN A pin of the chip, the-IN A pin of the chip is grounded through a sixth resistor, the OUT A pin of the chip is connected with one end of a fifth resistor, one end of a seventh resistor and one end of a capacitor, the other end of the fifth resistor and the other end of the capacitor are respectively connected with the-IN A pin of the chip, and the other end of the seventh resistor is connected with the + IN B pin of the chip and serves as an output end AD 1; the V + pin of the chip is connected with a power supply VCC, and the V-pin of the chip is grounded; the-IN B pin of the chip is grounded through an eighth resistor, the-IN B pin of the chip is connected with the OUT B pin of the chip through a ninth resistor, and the OUT B pin of the chip is used as an output end AD2 through a tenth resistor.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921323570.9U CN211013929U (en) | 2019-08-15 | 2019-08-15 | High-sensitivity oil smoke concentration measuring device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921323570.9U CN211013929U (en) | 2019-08-15 | 2019-08-15 | High-sensitivity oil smoke concentration measuring device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110398447A (en) * | 2019-08-15 | 2019-11-01 | 华帝股份有限公司 | High-sensitivity oil smoke concentration measuring device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110398447A (en) * | 2019-08-15 | 2019-11-01 | 华帝股份有限公司 | High-sensitivity oil smoke concentration measuring device |
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