CN115317720A - Infusion monitor and dropping liquid signal detection processing method thereof - Google Patents
Infusion monitor and dropping liquid signal detection processing method thereof Download PDFInfo
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- CN115317720A CN115317720A CN202210953910.6A CN202210953910A CN115317720A CN 115317720 A CN115317720 A CN 115317720A CN 202210953910 A CN202210953910 A CN 202210953910A CN 115317720 A CN115317720 A CN 115317720A
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- 239000007788 liquid Substances 0.000 title claims abstract description 25
- 238000001514 detection method Methods 0.000 title claims abstract description 24
- 238000001802 infusion Methods 0.000 title claims description 41
- 238000003672 processing method Methods 0.000 title abstract description 6
- 238000006243 chemical reaction Methods 0.000 claims abstract description 19
- 238000000034 method Methods 0.000 claims abstract description 10
- 238000005070 sampling Methods 0.000 claims description 26
- 238000012545 processing Methods 0.000 claims description 5
- 239000003990 capacitor Substances 0.000 claims description 3
- 239000012530 fluid Substances 0.000 claims description 2
- 238000012544 monitoring process Methods 0.000 description 7
- 230000005540 biological transmission Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000003321 amplification Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 2
- 238000003199 nucleic acid amplification method Methods 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 239000002504 physiological saline solution Substances 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 238000001990 intravenous administration Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000004448 titration Methods 0.000 description 1
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
- A61M5/14—Infusion devices, e.g. infusing by gravity; Blood infusion; Accessories therefor
- A61M5/168—Means for controlling media flow to the body or for metering media to the body, e.g. drip meters, counters ; Monitoring media flow to the body
- A61M5/16886—Means for controlling media flow to the body or for metering media to the body, e.g. drip meters, counters ; Monitoring media flow to the body for measuring fluid flow rate, i.e. flowmeters
- A61M5/1689—Drip counters
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
- A61M5/14—Infusion devices, e.g. infusing by gravity; Blood infusion; Accessories therefor
- A61M5/168—Means for controlling media flow to the body or for metering media to the body, e.g. drip meters, counters ; Monitoring media flow to the body
- A61M5/16831—Monitoring, detecting, signalling or eliminating infusion flow anomalies
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- Health & Medical Sciences (AREA)
- Hematology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Vascular Medicine (AREA)
- Engineering & Computer Science (AREA)
- Anesthesiology (AREA)
- Biomedical Technology (AREA)
- Veterinary Medicine (AREA)
- Public Health (AREA)
- Heart & Thoracic Surgery (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Measuring Volume Flow (AREA)
- Infusion, Injection, And Reservoir Apparatuses (AREA)
Abstract
The invention discloses a transfusion monitor and a dropping liquid signal detection processing method thereof.A received photoelectric signal is amplified by adding an amplifying circuit behind a photoelectric conversion circuit, and then a plurality of received signals are collected into a signal generated by dropping of the same dropping liquid within 30ms, so that an interference signal of the transfusion monitor can be eliminated, and the metering precision of the whole transfusion monitor is further improved. The method is convenient to implement, good in applicability, strong in anti-interference capability and high in metering precision.
Description
Technical Field
The invention belongs to the technical field of infusion monitoring, and particularly relates to an infusion monitor and a dropping signal detection processing method thereof.
Background
The infusion monitoring system is a device for monitoring the dropping speed of clinical intravenous infusion in real time, the detection mechanism of dropping liquid generally adopts the photoelectric detection principle, namely an infrared transmitting tube is adopted for transmitting, an infrared receiving tube is used for receiving, when the dropping liquid drops, the transmission of infrared light is blocked, the infrared light is received by the receiving tube, the infrared light is finally converted into the voltage change after the photoelectric conversion, and whether the dropping liquid drops is judged through the voltage change.
However, most of the liquid in the general transfusion is transparent physiological saline, and the transparent liquid drops can not completely block the transmission of infrared light, so that the voltage change is very small, the small-angle inclination or slight shaking of the transfusion tube in the transfusion monitoring process causes the blocking of the infrared light transmission by the dropping liquid to be reduced, the voltage change is further reduced, when the inclination angle reaches 10 degrees, the voltage change is very small, at the moment, the voltage change can not be detected out necessarily, the sensitivity of transfusion detection is influenced, and the applicability is poor.
Disclosure of Invention
The invention aims at solving the technical problems of low sensitivity and poor applicability of infusion detection in the background technology, and provides an infusion monitor and a dropping liquid signal detection processing method thereof, which can improve the anti-interference capability of infusion detection and enhance the applicability, thereby ensuring that the accuracy of infusion monitoring can be ensured even if an infusion tube is inclined or swayed within 10 degrees in the infusion monitoring process.
In order to realize the purpose, the invention adopts the following technical scheme:
the signal sampling circuit of the infusion monitor comprises an infrared transmitting tube, an infrared receiving tube and a photoelectric conversion circuit, wherein the infrared transmitting tube is connected to a power supply circuit, the infrared transmitting tube is connected with the infrared receiving tube through an optical signal, the infrared receiving tube is connected to the photoelectric conversion circuit, the signal sampling circuit also comprises an amplifying circuit, one end of the amplifying circuit is connected to the photoelectric conversion circuit, and the other end of the amplifying circuit is connected to an MCU.
The photoelectric conversion circuit mainly adopts an infrared receiving tube to convert signals, a power supply is connected with a pull-up resistor and then connected with the cathode of the infrared receiving tube, the anode of the infrared receiving tube is grounded, and a sampling signal is connected to a connecting wire of the pull-up resistor and the infrared receiving tube.
The amplifying circuit adopts an operational amplifier as a main module, a sampling signal is filtered by C37 and R28 and then is connected to the homodromous input end of the operational amplifier, and the reverse input end is connected with a resistor R33 and then is grounded; the output end is connected to the MCU after passing through the filter capacitor C40, and an R31 resistor is connected between the output end and the reverse input end.
The operational amplifier is RS8551XF.
The dropping liquid signal processing method of the transfusion monitor comprises the following steps:
(1) The signal sampling circuit collects a pulse signal: the signal sampling circuit receives the pulse signal, amplifies the pulse signal and then sends the pulse signal to the MCU;
(2) And (3) collecting pulse signals: the MCU collects a plurality of received amplified pulse signals to obtain the number of effective pulse signals;
(3) The number of the effective pulse signals is the dropping number of the dropping liquid;
the collection is carried out according to the following method:
(1) After the signal sampling circuit receives the first pulse signal, the MCU firstly records the time of the first pulse signal and collects the first pulse signal as a first effective pulse signal;
(2) The signal sampling circuit receives the second pulse signal, the MCU records the time of the second pulse signal, and judges whether the interval between the second pulse signal and the first effective pulse signal exceeds 30ms; if the pulse signal is not exceeded, discarding the second pulse signal, continuously detecting whether the signal sampling circuit receives the pulse signal, simultaneously recording the generation time of the pulse signal, judging whether the interval between the pulse signal and the first effective pulse signal exceeds 30ms, and if the interval is not exceeded, discarding the pulse signal;
(3) If the interval between the detected pulse signal and the first effective pulse signal exceeds 30ms, recording the pulse signal as a second effective pulse signal, recording the generation time of the pulse signal, continuously detecting whether the signal sampling circuit receives the pulse signal, judging whether the generation time interval between the received pulse signal and the second effective pulse signal exceeds 30ms, losing if the generation time interval does not exceed 30ms, recording the generation time of the pulse signal if the generation time interval exceeds 30ms, and simultaneously recording the generation time of the pulse signal as a third effective pulse signal;
(4) When detecting that the Nth pulse signal arrives, recording the generation time of the Nth pulse signal, and judging whether the time interval between the received Nth pulse signal and the received N-1 th pulse signal exceeds 30ms or not, if not, the time interval is lost, if so, the generation time of the pulse signal is recorded, and meanwhile, the time interval is recorded as the Nth effective pulse signal;
(5) And when the detection signal sampling circuit cannot receive the pulse signals, judging that the infusion is finished, and recording the total number of infusion drops as N according to the number of the recorded effective pulse signals.
The detection signal is a pulse generated when the infusion tube sac is inclined at 10 degrees.
The amplitude of the detection signal is greater than 50mV.
The beneficial effects obtained by the invention are as follows:
1. by adding the signal amplifying circuit behind the photoelectric conversion circuit, the received weak detection signal can be amplified, and the loss of the detection signal is avoided.
2. By collecting several signals received within 30ms into the signal sent by the same dropping liquid, interference signals can be eliminated, so that the anti-interference capability of the infusion monitor is greatly improved, and the application range is wider.
3. The invention can still ensure the accuracy of dropping detection even when the infusion tube sac is inclined by 10 degrees, thereby greatly adapting to the requirement of actual injection.
4. The invention has accurate measuring result.
5. The invention overcomes the technical prejudice, firstly amplifies the signal after receiving the signal of dropping, and then collects the received signal into the signal of dropping in the same dropping within 30ms, thereby improving the accuracy of the metering result. The conventional signal processing is to filter the received signal first and then amplify it to remove the interference.
Drawings
FIG. 1 is a schematic diagram of a drip detection of a fluid delivery monitor according to the present invention;
FIG. 2 is a schematic diagram of a photoelectric conversion circuit;
FIG. 3 is a schematic diagram of an amplifying circuit;
FIG. 4 is a signal when no drip drops;
FIG. 5 is a pulse signal for 3 drops of liquid;
FIG. 6 is the original pulse signal of a drop of liquid falling with the infusion tube sac upright;
fig. 7 to 9 show the pulse signals for a drop falling when the bag is tilted 10 °, the lower signal being the original pulse signal, denoted signal 1, and the upper signal being the amplified pulse signal, denoted signal 2.
Fig. 10 is a signal collection flow chart.
Detailed Description
In the following description, referring to the drawings in further detail, fig. 1 is a schematic diagram of a signal sampling circuit of the infusion monitor according to the present invention, wherein the signal sampling circuit includes an infrared transmitting tube, an infrared receiving tube, a photoelectric conversion circuit, and an amplifying circuit, the infrared transmitting tube is connected to the infrared receiving tube via an optical signal, the infrared receiving tube is connected to the photoelectric conversion circuit, the photoelectric conversion circuit is connected to the amplifying circuit, the amplifying circuit is further connected to the MCU, and the infrared transmitting tube is connected to the power supply circuit.
The photoelectric conversion circuit mainly adopts an infrared receiving tube to convert signals, a power supply is connected with a pull-up resistor and then connected with the cathode of the infrared receiving tube, the anode of the infrared receiving tube is grounded, and a sampling signal is connected to a connecting wire of the pull-up resistor and the infrared receiving tube. When no liquid drops fall, the infrared receiving tube is in a conducting state, the infrared receiving tube outputs low level outwards due to the positive electrode connection level, when the liquid drops fall, the infrared receiving tube is in a cut-off state, and the infrared receiving tube is pulled up to high level due to the negative electrode connection resistance, so that high level is output outwards.
The amplifying circuit adopts an operational amplifier as a main module, a sampling signal is filtered by C37 and R28 and then is connected to the homodromous input end of the operational amplifier, and the reverse input end is connected with a resistor R33 and then is grounded; the output end is connected to the MCU after passing through the filter capacitor C40, and an R31 resistor is connected between the output end and the reverse input end. The operational amplifier adopts RS8551XF, adopts a forward amplifying circuit, has the gain of 66, is equivalent to the input of 50mV, and has the output of 3.3V, thereby meeting the application scene of small voltage change.
When no dropping liquid falls, as shown in fig. 4, no pulse signal appears, and when the dropping liquid falls, the transmission of infrared light is blocked, so that the infrared light reception by the receiving tube is reduced, and the infrared light is finally converted into a pulse signal after passing through the photoelectric conversion circuit, as shown in fig. 5.
However, the liquid for infusion is generally transparent physiological saline, and the transparent liquid drop cannot completely block the transmission of infrared light, so the amplitude of the generated pulse voltage is not large, as shown in fig. 6, the amplitude of the pulse voltage generated by dropping of the liquid drop under normal conditions is 1.248V, and the pulse MCU with the amplitude can also detect the pulse voltage, however, during the infusion monitoring process, the small-angle inclination or slight shaking of the infusion tube sac causes the blocking of the infrared light by the liquid drop to be further reduced, the amplitude of the pulse voltage is further reduced, as shown in fig. 7, the signal 1 is a pulse generated when the infusion tube sac is inclined at 10 °, and the weak amplitude is 176mV, so the pulse signal MCU cannot detect the pulse voltage. Therefore, an amplifying circuit is added behind the photoelectric conversion circuit, as shown in fig. 3, and the original pulse signal is amplified, and as shown in fig. 8, the signal 2 is a signal pulse with an amplified amplitude of 3.3V, which meets the detection requirement of the MCU. Theoretically, after 176mV is amplified to gain 66, the voltage should be 11.6V, but the supply voltage of the amplifying circuit is 3.3V, so that the actual output maximum voltage is 3.3V when the theoretical amplification voltage exceeds 3.3V.
According to the MCU detection mechanism, 1 is added for every drop detected with 1 pulse, theoretically, one pulse is generated for every drop falling, and actually, 2 or more weak original pulses are generated for every drop falling, as shown in fig. 8, signal 1. Although the original pulse is weak, in order to solve the problem of the amplification circuit introduced by the inclination or shaking of the infusion tube sac, even 3 weak original pulses are amplified to become 3 high-amplitude pulses, as shown by a signal 2 in fig. 8. The number of drops should be 3 at this time according to the detection mechanism, but only one drop is dropped at this time.
In order to solve the problem, the following method is adopted to process, as shown in fig. 8 and fig. 9, the interval between 3 pulses is respectively 3.16ms and 8.6ms, the time interval is very short, after a large number of dropping tests, the interval of a plurality of pulses generated by dropping one drop is not more than 30ms, the dropping speed is 33 drops/second according to the interval of 30ms, which is equivalent to 1980 drops/min, and the dropping speed obviously exceeds the normal dropping speed of the infusion in the actual infusion process by 60-80 drops/min, so that when the MCU detects the pulse group below 30ms, the MCU is processed according to the dropping of 1 drop.
The invention is applied to a simulated environment for detection in the following way: the infusion tube sac is inclined by 10 degrees, and counting is respectively carried out by adopting manual counting and the counting method, and then comparison is carried out. Meanwhile, in order to explain the beneficial effects of the invention and the prior art, a certain type of infusion monitor purchased in the market is introduced for comparison, and a mode of comparing manual counting with the counting of the infusion monitor is also adopted. As shown in Table 1, the results showed significant deviations in all 3 titration experiments using a commercially available infusion monitor model, with the major deviations being in the low counts.
The main components of the infusion monitor signal sampling circuit are shown in table 2.
TABLE 1
TABLE 2
Claims (8)
1. The utility model provides a transfusion monitor, transfusion monitor's signal sampling circuit includes infrared transmitting tube, infrared receiving tube, photoelectric conversion circuit, and infrared transmitting tube is connected to supply circuit, and infrared transmitting tube is connected through the light signal with infrared receiving tube, and infrared receiving tube is connected to photoelectric conversion circuit, its characterized in that still includes amplifier circuit, amplifier circuit one end is connected to photoelectric conversion circuit, and the amplifier circuit other end is connected to MCU.
2. The infusion monitor according to claim 1, wherein the photoelectric conversion circuit mainly uses an infrared receiving tube for signal conversion, a power supply is connected with a pull-up resistor and then connected with a cathode of the infrared receiving tube, an anode of the infrared receiving tube is grounded, and a sampling signal is connected to a connecting wire between the pull-up resistor and the infrared receiving tube.
3. The infusion monitor according to claim 1, wherein the amplifying circuit uses an operational amplifier as a main module, the sampling signal is filtered by C37 and R28 and then connected to the same-direction input end of the operational amplifier, and the reverse-direction input end is connected to a resistor R33 and then grounded; the output end is connected to the MCU after passing through the filter capacitor C40, and an R31 resistor is connected between the output end and the reverse input end.
4. A fluid delivery monitor as defined in claim 3 wherein the operational amplifier is RS8551XF.
5. A method of processing a drip signal for an infusion monitor as defined in claim 1, comprising the steps of:
(1) The signal sampling circuit collects a pulse signal: the signal sampling circuit receives the pulse signal, amplifies the pulse signal and then sends the pulse signal to the MCU;
(2) And (3) collecting pulse signals: the MCU collects a plurality of received amplified pulse signals to obtain the number of effective pulse signals;
(3) The number of effective pulse signals is the dropping number of the dropping liquid.
6. A method of processing a drip signal of an infusion monitor as claimed in claim 5, wherein the grouping is performed by:
(1) After the signal sampling circuit receives the first pulse signal, the MCU firstly records the time of the first pulse signal and collects the first pulse signal as a first effective pulse signal;
(2) The signal sampling circuit receives the second pulse signal, the MCU records the time of the second pulse signal and judges whether the interval between the second pulse signal and the first effective pulse signal exceeds 30ms; if the pulse signal is not exceeded, discarding the second pulse signal, continuously detecting whether the signal sampling circuit receives the pulse signal, simultaneously recording the generation time of the pulse signal, judging whether the interval between the pulse signal and the first effective pulse signal exceeds 30ms, and if the interval is not exceeded, discarding the pulse signal;
(3) If the interval between the detected pulse signal and the first effective pulse signal exceeds 30ms, recording the pulse signal as a second effective pulse signal, recording the generation time of the pulse signal, continuously detecting whether the signal sampling circuit receives the pulse signal, judging whether the interval between the received pulse signal and the second effective pulse signal exceeds 30ms, losing if not, recording the generation time of the pulse signal if exceeding, and simultaneously recording the pulse signal as a third effective pulse signal;
(4) When detecting that the Nth pulse signal arrives, recording the generation time of the Nth pulse signal, and judging whether the time interval between the received Nth pulse signal and the received N-1 th pulse signal exceeds 30ms or not, if not, the time interval is lost, if so, the generation time of the pulse signal is recorded, and meanwhile, the time interval is recorded as the Nth effective pulse signal;
(5) And when the detection signal sampling circuit cannot receive the pulse signals, judging that the infusion is finished, and recording the total number of infusion drops as N according to the number of the recorded effective pulse signals.
7. A method of drip signal processing in an infusion monitor as claimed in claim 5, wherein the detection signal is a pulse generated by the infusion tube cuff at a 10 ° tilt.
8. A method of drip signal processing in an infusion monitor according to claim 5, wherein the amplitude of the detection signal is greater than 50mV.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210953910.6A CN115317720A (en) | 2022-08-10 | 2022-08-10 | Infusion monitor and dropping liquid signal detection processing method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210953910.6A CN115317720A (en) | 2022-08-10 | 2022-08-10 | Infusion monitor and dropping liquid signal detection processing method thereof |
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| CN115317720A true CN115317720A (en) | 2022-11-11 |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1306867A (en) * | 2000-01-28 | 2001-08-08 | 沈阳建筑工程学院 | Automatic display alarm for intravenous infusion |
| CN1359732A (en) * | 2000-12-20 | 2002-07-24 | 深圳市康哲药业有限公司 | Automatic control system for intravenous drip |
| CN101856525A (en) * | 2010-06-07 | 2010-10-13 | 包金明 | Medical infusion liquid drop speed monitoring method and device |
| CN201862049U (en) * | 2010-11-24 | 2011-06-15 | 罗卫庆 | Infusion alarming system |
| CN102526837A (en) * | 2012-01-18 | 2012-07-04 | 李益民 | Transfusion speed monitoring technology |
| CN105955112A (en) * | 2016-05-10 | 2016-09-21 | 大连理工大学 | Intelligent transfusion monitoring system |
| CN109432548A (en) * | 2018-12-04 | 2019-03-08 | 徐州市康复医院 | Number of infusion drops sensitive display |
-
2022
- 2022-08-10 CN CN202210953910.6A patent/CN115317720A/en not_active Withdrawn
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1306867A (en) * | 2000-01-28 | 2001-08-08 | 沈阳建筑工程学院 | Automatic display alarm for intravenous infusion |
| CN1359732A (en) * | 2000-12-20 | 2002-07-24 | 深圳市康哲药业有限公司 | Automatic control system for intravenous drip |
| CN101856525A (en) * | 2010-06-07 | 2010-10-13 | 包金明 | Medical infusion liquid drop speed monitoring method and device |
| CN201862049U (en) * | 2010-11-24 | 2011-06-15 | 罗卫庆 | Infusion alarming system |
| CN102526837A (en) * | 2012-01-18 | 2012-07-04 | 李益民 | Transfusion speed monitoring technology |
| US20130184675A1 (en) * | 2012-01-18 | 2013-07-18 | Peng Chen | Infusion Monitoring Device and Method for Monitoring the Infusion Dripping Rate and Alarming for the Irregularities of the Infusion |
| CN105955112A (en) * | 2016-05-10 | 2016-09-21 | 大连理工大学 | Intelligent transfusion monitoring system |
| CN109432548A (en) * | 2018-12-04 | 2019-03-08 | 徐州市康复医院 | Number of infusion drops sensitive display |
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