CN220455538U - Paper quantitative detection device based on tellurium-zinc-cadmium detector - Google Patents
Paper quantitative detection device based on tellurium-zinc-cadmium detector Download PDFInfo
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- CN220455538U CN220455538U CN202321769201.9U CN202321769201U CN220455538U CN 220455538 U CN220455538 U CN 220455538U CN 202321769201 U CN202321769201 U CN 202321769201U CN 220455538 U CN220455538 U CN 220455538U
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- 229910052793 cadmium Inorganic materials 0.000 title claims abstract description 56
- 238000001514 detection method Methods 0.000 title claims abstract description 42
- 230000002285 radioactive effect Effects 0.000 claims abstract description 24
- 238000012545 processing Methods 0.000 claims abstract description 13
- 230000005250 beta ray Effects 0.000 claims abstract description 12
- 230000000149 penetrating effect Effects 0.000 claims abstract description 5
- 239000004065 semiconductor Substances 0.000 claims description 38
- 230000005855 radiation Effects 0.000 claims description 16
- 238000012544 monitoring process Methods 0.000 claims description 3
- 230000017525 heat dissipation Effects 0.000 claims 1
- 230000035945 sensitivity Effects 0.000 abstract description 9
- 238000005259 measurement Methods 0.000 description 4
- 230000004044 response Effects 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000002035 prolonged effect Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- DNNSSWSSYDEUBZ-OUBTZVSYSA-N krypton-85 Chemical compound [85Kr] DNNSSWSSYDEUBZ-OUBTZVSYSA-N 0.000 description 1
- 238000013178 mathematical model Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052699 polonium Inorganic materials 0.000 description 1
- HZEBHPIOVYHPMT-UHFFFAOYSA-N polonium atom Chemical compound [Po] HZEBHPIOVYHPMT-UHFFFAOYSA-N 0.000 description 1
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Abstract
The utility model discloses a paper quantitative detection device based on a tellurium-zinc-cadmium detector, which comprises the tellurium-zinc-cadmium detector and a radioactive source, wherein a collimator is arranged between the radioactive source and paper, a preamplifier is arranged on one side, far away from the paper, of the tellurium-zinc-cadmium detector, and the preamplifier is also connected with a singlechip processing system; the collimator is used for forming beta rays emitted by the radioactive source into parallel beta ray beams and emitting the parallel beta ray beams to the paper; the tellurium-zinc-cadmium detector is used for absorbing beta rays penetrating through paper and converting the beta rays into current signals; the preamplifier is used for converting the received current signal of the tellurium-zinc-cadmium detector into a voltage signal and amplifying the voltage signal; the single chip microcomputer processing system performs digital acquisition processing on the voltage signal of the preamplifier. According to the utility model, a tellurium-zinc-cadmium detector is adopted to replace the traditional ionization chamber detection mode, so that the detection sensitivity is improved, a subsequent amplifying circuit does not need to adopt a resistance of hundreds of megaohms, the noise and temperature drift of the resistance of hundreds of megaohms are avoided, and the noise signal is correspondingly reduced.
Description
Technical Field
The utility model relates to the technical field of paper measurement, in particular to a paper quantitative detection device based on a tellurium-zinc-cadmium detector.
Background
The currently known detection method for quantitative paper adopts beta rays generated by radioactive sources such as krypton 85, polonium 147 and the like of an isotope radioactive source, the beta rays are collimated by a collimator through a shutter mechanism to form a beam of nearly parallel light, the beam of the beta rays penetrating through the paper enter an ionization chamber through paper attenuation, inert gas in the ionization chamber is ionized to generate a charge signal, a weak current signal is formed under the action of a high-voltage electric field and is output from an electrode of the ionization chamber, the current signal is converted into a voltage signal through a preamplifier and amplified, and then the voltage signal is acquired and processed through a singlechip circuit to obtain corresponding digital signals, and the digital signals are calculated through a mathematical model algorithm to obtain the quantitative paper.
The method has the defects that the ionization chamber is adopted for ray detection, the ionization chamber is large in volume, the shell is electrified, the installation is inconvenient, effective electromagnetic shielding is not easy to perform, and the generated signal is weak, so that a subsequent amplifying circuit needs to adopt hundreds of megaohm resistors to perform current-voltage conversion, the temperature drift of the hundreds of megaohm resistors is large, the noise is also large, fluctuation and drift of a detection signal are caused, smooth filtering treatment is needed, the response time of a sensor is more than 20 milliseconds, and the use requirement of a high-speed paper machine cannot be met.
In view of this, the present application is specifically proposed.
Disclosure of Invention
The utility model aims to provide a paper quantitative detection device based on a tellurium-zinc-cadmium detector, which adopts the tellurium-zinc-cadmium detector to replace the traditional ionization chamber detection mode, improves the detection sensitivity, ensures that a follow-up amplifying circuit does not need to adopt a hundreds of megaohm resistor, avoids the noise and temperature drift of the hundreds of megaohm resistor, reduces the noise signal correspondingly, greatly reduces the volume of the device, can implement effective electromagnetic shielding on a sensitive unit and further improves the signal-to-noise ratio.
The utility model is realized by the following technical scheme:
the paper quantitative detection device based on the tellurium-zinc-cadmium detector comprises the tellurium-zinc-cadmium detector and a radioactive source which are respectively arranged at two sides of paper, a collimator is arranged between the radioactive source and the paper, a preamplifier is arranged at one side, far away from the paper, of the tellurium-zinc-cadmium detector, and the preamplifier is also connected with a singlechip processing system;
the collimator is used for forming beta rays emitted by the radioactive source into parallel beta ray beams and emitting the parallel beta ray beams to paper;
the tellurium-zinc-cadmium detector is used for absorbing beta rays penetrating through paper and converting the beta rays into current signals;
the preamplifier is used for converting the received current signal of the tellurium-zinc-cadmium detector into a voltage signal and amplifying the voltage signal;
the single chip microcomputer processing system performs digital acquisition processing on the voltage signal of the pre-amplifier to obtain a detection signal corresponding to the quantitative paper.
According to the utility model, a tellurium-zinc-cadmium detector is adopted to replace a traditional ionization chamber detection mode, so that the detection sensitivity is improved, a subsequent amplifying circuit does not need to adopt a resistance of hundreds of megaohms, the noise and temperature drift of the resistance of hundreds of megaohms are avoided, the noise signal is correspondingly reduced, meanwhile, the volume of the device is greatly reduced, the effective electromagnetic shielding can be implemented on a sensitive unit, the signal-to-noise ratio is further improved, and the sensor can be more closely detected by paper due to the small volume of the detector, so that the influence caused by the change of the air density of a measurement gap is reduced, the response time of the sensor is reduced to be within 5 milliseconds, and the online detection requirement of all paper machines on a papermaking production line is met.
Further, the tellurium-zinc-cadmium detector is provided with a semiconductor refrigerator towards one side far away from the paper, and the tellurium-zinc-cadmium detector is arranged on the cold surface of the semiconductor refrigerator.
Furthermore, a thermistor is arranged at the mounting position of the cold surface of the semiconductor refrigerator, which is closely attached to the tellurium-zinc-cadmium detector, and the semiconductor refrigerator, the thermistor and the temperature control module are connected through electric signals;
the thermistor is used for monitoring the temperature of the cold face of the semiconductor refrigerator and feeding back the resistance corresponding to the temperature control module;
and the temperature control module controls and adjusts the power supply voltage of the semiconductor refrigerator according to the set working temperature so as to stabilize the cold surface temperature at the set value.
According to the utility model, the semiconductor refrigerator is added to accurately control the working temperature of the tellurium-zinc-cadmium detector, so that the detector is ensured to work stably, and the sensitivity and dark current of the tellurium-zinc-cadmium detector are stabilized, so that the detector can adapt to the severe working environment on site.
Further, a heat radiating device is arranged on the hot face of the semiconductor refrigerator and used for taking away heat generated by the semiconductor refrigerator. According to the utility model, the heat radiating device is arranged on the hot surface of the semiconductor refrigerator, so that the temperature difference between the cold surface and the hot surface of the semiconductor refrigerator can be reduced, the working current of the semiconductor refrigerator can be reduced, the power consumption can be reduced, and the service life of the semiconductor refrigerator can be prolonged.
Furthermore, the tellurium-zinc-cadmium detector, the semiconductor refrigerator and the preamplifier are all arranged in the electromagnetic shielding box, so that interference signals can be reduced, noise can be reduced, and signal-to-noise ratio can be improved.
Further, the radioactive source is arranged in the source cylinder, the source cylinder is provided with a rotating device, and the rotating device is used for driving the source cylinder to rotate by taking a horizontal line parallel to the paper as an axis so as to enable the radioactive source to face the collimator; the rotating device comprises a rotating shaft and a rotating cylinder, wherein the rotating shaft is connected to the side wall of the source cylinder and is coaxially arranged with the rotating axis of the source cylinder, and the rotating cylinder is used for driving the rotating shaft to do rotary motion around the axis of the rotating cylinder. When the device works, the rotary cylinder can drive the source cylinder to rotate, so that the radioactive source faces the collimator, beta rays are collimated by the collimator to form parallel beta ray beams, and the parallel beta ray beams are emitted to paper.
Further, the device also comprises a support, a ray shielding cavity is formed in the support, the source cylinder is installed in the ray shielding cavity, an open groove is formed in one side, close to the paper, of the support, and the collimator is installed in the open groove. When the detection device does not need to detect, the rotary cylinder reversely rotates to drive the radioactive source to reset, and the radioactive source is positioned in the ray shielding cavity formed by the support and does not radiate to the outside.
Further, the radioactive source adopts 85 A Kr radiation source, said 85 The Kr radioactive source radiates beta rays with the energy of 672KeV, and has long service life and high detection sensitivity.
Compared with the prior art, the utility model has the following advantages and beneficial effects,
according to the paper quantitative detection device based on the tellurium-zinc-cadmium detector, the tellurium-zinc-cadmium detector is adopted to replace a traditional ionization chamber detection mode, so that detection sensitivity is improved, a follow-up amplifying circuit does not need to adopt a resistance of hundreds of megaohms, noise and temperature drift of the resistance of hundreds of megaohms are avoided, noise signals are correspondingly reduced, meanwhile, the size of the device is greatly reduced, effective electromagnetic shielding can be implemented on a sensitive unit, the signal-to-noise ratio is further improved, and due to the small size of the detector, a sensor can be detected closer to paper, the influence caused by air density change of a measurement gap is reduced, and the response time of the sensor is reduced to within 5 milliseconds, so that the on-line detection requirement of all paper machines on a papermaking production line is met.
Drawings
In order to more clearly illustrate the technical solutions of the exemplary embodiments of the present utility model, the drawings that are needed in the examples will be briefly described below, it being understood that the following drawings only illustrate some examples of the present utility model and therefore should not be considered as limiting the scope, and that other related drawings may be obtained from these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of a detection device according to an embodiment of the present utility model.
Reference numerals and corresponding part names:
the device comprises a 1-tellurium-zinc-cadmium detector, a 2-radioactive source, 3-paper, a 4-collimator, a 5-preamplifier, a 6-singlechip processing system, a 7-semiconductor refrigerator, an 8-thermistor, a 9-temperature control module, a 10-radiating device, an 11-electromagnetic shielding box, a 12-source cylinder, a 13-rotary cylinder and a 14-support.
Detailed Description
For the purpose of making apparent the objects, technical solutions and advantages of the present utility model, the present utility model will be further described in detail with reference to the following examples and the accompanying drawings, wherein the exemplary embodiments of the present utility model and the descriptions thereof are for illustrating the present utility model only and are not to be construed as limiting the present utility model.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present utility model. However, it will be apparent to one of ordinary skill in the art that: no such specific details are necessary to practice the utility model. In other instances, well-known structures have not been described in detail in order to not obscure the utility model.
Throughout the specification, references to "one embodiment," "an embodiment," "one example," or "an example" mean: a particular feature, structure, or characteristic described in connection with the embodiment or example is included within at least one embodiment of the utility model. Thus, the appearances of the phrases "in one embodiment," "in an example," or "in an example" in various places throughout this specification are not necessarily all referring to the same embodiment or example. Furthermore, the particular features, structures, or characteristics may be combined in any suitable combination and/or sub-combination in one or more embodiments or examples. Moreover, those of ordinary skill in the art will appreciate that the illustrations provided herein are for illustrative purposes and that the illustrations are not necessarily drawn to scale. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
In the description of the present utility model, the terms "front", "rear", "left", "right", "upper", "lower", "vertical", "horizontal", "high", "low", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, merely to facilitate description of the present utility model and simplify description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the scope of the present utility model.
Example 1
As shown in fig. 1, the embodiment of the utility model provides a paper quantitative detection device based on a tellurium-zinc-cadmium detector, which comprises a tellurium-zinc-cadmium detector 1 and a radiation source 2 which are respectively arranged at two sides of paper 3, wherein a collimator 4 is arranged between the radiation source 2 and the paper 3, a preamplifier 5 is arranged at one side, far away from the paper, of the tellurium-zinc-cadmium detector 1, and the preamplifier 5 is also connected with a singlechip processing system 6;
the collimator 4 is used for forming beta rays emitted by the radiation source 2 into parallel beta ray beams and emitting the parallel beta ray beams to the paper 3;
the tellurium-zinc-cadmium detector 1 is used for absorbing beta rays penetrating through paper and converting the beta rays into current signals;
the preamplifier 5 is used for converting the received current signal of the tellurium-zinc-cadmium detector 1 into a voltage signal and amplifying the voltage signal;
the single chip microcomputer processing system 6 carries out digital acquisition processing on the voltage signal of the pre-amplifier 5 to obtain a detection signal corresponding to the quantitative paper.
According to the utility model, a tellurium-zinc-cadmium detector is adopted to replace a traditional ionization chamber detection mode, so that the detection sensitivity is improved, a subsequent amplifying circuit does not need to adopt a resistance of hundreds of megaohms, the noise and temperature drift of the resistance of hundreds of megaohms are avoided, the noise signal is correspondingly reduced, meanwhile, the volume of the device is greatly reduced, the effective electromagnetic shielding can be implemented on a sensitive unit, the signal-to-noise ratio is further improved, and the sensor can be more closely detected by paper due to the small volume of the detector, so that the influence caused by the change of the air density of a measurement gap is reduced, the response time of the sensor is reduced to be within 5 milliseconds, and the online detection requirement of all paper machines on a papermaking production line is met.
Preferably, the tellurium-zinc-cadmium detector 1 is provided with a semiconductor refrigerator 7 on the side facing away from the paper 3, and the tellurium-zinc-cadmium detector 1 is mounted on the cold face of the semiconductor refrigerator 7.
Preferably, a thermistor 8 is arranged at the position, close to the tellurium-zinc-cadmium detector 1, of the cold surface of the semiconductor refrigerator 7, and the semiconductor refrigerator 7, the thermistor 8 and the temperature control module 9 are connected through electrical signals;
the thermistor 8 is used for monitoring the temperature of the cold face of the semiconductor refrigerator 7 and feeding back the resistance corresponding to the temperature control module 9;
the temperature control module 9 controls and adjusts the power supply voltage of the semiconductor refrigerator 7 according to the set working temperature so as to stabilize the cold surface temperature at the set value.
According to the utility model, the semiconductor refrigerator is added to accurately control the working temperature of the tellurium-zinc-cadmium detector, so that the detector is ensured to work stably, and the sensitivity and dark current of the tellurium-zinc-cadmium detector are stabilized, so that the detector can adapt to the severe working environment on site.
Preferably, a heat dissipating device 10 is installed on the hot surface of the semiconductor refrigerator 7, so as to take away the heat generated by the semiconductor refrigerator 7. According to the utility model, the heat radiating device is arranged on the hot surface of the semiconductor refrigerator, so that the temperature difference between the cold surface and the hot surface of the semiconductor refrigerator can be reduced, the working current of the semiconductor refrigerator can be reduced, the power consumption can be reduced, and the service life of the semiconductor refrigerator can be prolonged.
Preferably, the tellurium-zinc-cadmium detector 1, the semiconductor refrigerator 7 and the preamplifier 5 are all arranged in the electromagnetic shielding box 11, so that interference signals can be reduced, noise can be reduced, and signal-to-noise ratio can be improved.
Preferably, the radiation source 2 is installed in the source cylinder 12, and the source cylinder 12 is provided with a rotating device, and the rotating device is used for driving the source cylinder 12 to rotate by taking a horizontal line parallel to the paper 3 as an axis so as to enable the radiation source 2 to face the collimator 4; the rotating device comprises a rotating shaft which is connected to the side wall of the source cylinder 12 and is coaxially arranged with the rotating axis of the source cylinder 12, and a rotating cylinder 13 which drives the rotating shaft to rotate around the axis of the rotating shaft. When the device works, the rotary cylinder can drive the source cylinder to rotate, so that the radioactive source faces the collimator, beta rays form parallel beta ray beams after being collimated by the collimator, and the beta ray beams are emitted to paper
Preferably, the collimator comprises a support 14, a radiation shielding cavity is formed inside the support 14, the source cylinder 12 is installed in the radiation shielding cavity, an open groove is formed in one side, close to paper, of the support 14, and the collimator 4 is installed in the open groove. When the detection device does not need to detect, the rotary cylinder reversely rotates to drive the radioactive source to reset, and the radioactive source is positioned in the ray shielding cavity formed by the support and does not radiate to the outside.
Preferably, the radiation source 2 is a radiation source 85 A Kr radiation source, said 85 The Kr radioactive source radiates beta rays with the energy of 672KeV, and has long service life and high detection sensitivity.
The foregoing description of the embodiments has been provided for the purpose of illustrating the general principles of the utility model, and is not meant to limit the scope of the utility model, but to limit the utility model to the particular embodiments, and any modifications, equivalents, improvements, etc. that fall within the spirit and principles of the utility model are intended to be included within the scope of the utility model.
Claims (10)
1. The paper quantitative detection device based on the tellurium-zinc-cadmium detector is characterized by comprising the tellurium-zinc-cadmium detector (1) and a radioactive source (2) which are respectively arranged on two sides of paper (3), wherein a collimator (4) is arranged between the radioactive source (2) and the paper (3), a preamplifier (5) is arranged on one side, far away from the paper, of the tellurium-zinc-cadmium detector (1), and the preamplifier (5) is also connected with a singlechip processing system (6);
the collimator (4) is used for forming beta rays emitted by the radioactive source (2) into parallel beta ray beams and emitting the parallel beta ray beams to the paper (3);
the tellurium-zinc-cadmium detector (1) is used for absorbing beta rays penetrating through paper and converting the beta rays into current signals;
the preamplifier (5) is used for converting the received current signal of the tellurium-zinc-cadmium detector (1) into a voltage signal and amplifying the voltage signal;
the single chip microcomputer processing system (6) performs digital acquisition processing on the voltage signal of the pre-amplifier (5) to obtain a detection signal corresponding to the quantitative paper.
2. The paper quantitative detection device based on the tellurium-zinc-cadmium detector according to claim 1, wherein the tellurium-zinc-cadmium detector (1) is provided with a semiconductor refrigerator (7) on the side far away from the paper (3), and the tellurium-zinc-cadmium detector (1) is arranged on the cold surface of the semiconductor refrigerator (7).
3. The paper quantitative detection device based on the tellurium-zinc-cadmium detector according to claim 2, wherein a thermistor (8) is arranged at the mounting position of the cold surface of the semiconductor refrigerator (7) close to the tellurium-zinc-cadmium detector (1), and the semiconductor refrigerator (7), the thermistor (8) and the temperature control module (9) are connected through electric signals;
the thermistor (8) is used for monitoring the temperature of the cold surface of the semiconductor refrigerator (7) and feeding back the resistance corresponding to the temperature control module (9);
the temperature control module (9) controls and adjusts the power supply voltage of the semiconductor refrigerator (7) according to the set working temperature so as to stabilize the cold surface temperature at the set value.
4. The paper quantitative detection device based on the tellurium-zinc-cadmium detector according to claim 2, wherein a heat dissipation device (10) is arranged on the hot surface of the semiconductor refrigerator (7) and is used for taking away heat generated by the semiconductor refrigerator (7).
5. The tellurium-zinc-cadmium detector-based paper quantitative detection device according to claim 2, wherein the tellurium-zinc-cadmium detector (1), the semiconductor refrigerator (7) and the preamplifier (5) are all installed in an electromagnetic shielding box (11).
6. The quantitative paper detection device based on the tellurium-zinc-cadmium detector according to claim 1, wherein the radioactive source (2) is installed in a source cylinder (12), the source cylinder (12) is provided with a rotating device, and the rotating device is used for driving the source cylinder (12) to rotate by taking a horizontal line parallel to the paper (3) as an axis so as to enable the radioactive source (2) to face the collimator (4).
7. The quantitative paper detection device based on the tellurium-zinc-cadmium detector according to claim 6, wherein the rotating device comprises a rotating shaft which is connected to the side wall of the source cylinder (12) and is coaxially arranged with the rotating axis of the source cylinder (12), and a rotating cylinder (13) which drives the rotating shaft to rotate around the self axis.
8. The quantitative paper detection device based on the tellurium-zinc-cadmium detector according to claim 6, further comprising a support (14), wherein a radiation shielding cavity is formed inside the support (14), the source cylinder (12) is installed in the radiation shielding cavity, an open groove is formed in one side, close to paper, of the support (14), and the collimator (4) is installed at the open groove.
9. The tellurium-zinc-cadmium detector-based quantitative paper detection device according to claim 1, wherein the radiation source (2) adopts 85 Kr radiation source.
10. The tellurium-zinc-cadmium detector based paper quantitative detection device according to claim 9, wherein the 85 The Kr radiation source radiates beta rays with an energy of 672 KeV.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321769201.9U CN220455538U (en) | 2023-07-06 | 2023-07-06 | Paper quantitative detection device based on tellurium-zinc-cadmium detector |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321769201.9U CN220455538U (en) | 2023-07-06 | 2023-07-06 | Paper quantitative detection device based on tellurium-zinc-cadmium detector |
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| Publication Number | Publication Date |
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| CN220455538U true CN220455538U (en) | 2024-02-06 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202321769201.9U Active CN220455538U (en) | 2023-07-06 | 2023-07-06 | Paper quantitative detection device based on tellurium-zinc-cadmium detector |
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| CN (1) | CN220455538U (en) |
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- 2023-07-06 CN CN202321769201.9U patent/CN220455538U/en active Active
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