CN205749379U - A kind of water content measuring instrument based on capacitance detecting principle - Google Patents
A kind of water content measuring instrument based on capacitance detecting principle Download PDFInfo
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- CN205749379U CN205749379U CN201620465690.2U CN201620465690U CN205749379U CN 205749379 U CN205749379 U CN 205749379U CN 201620465690 U CN201620465690 U CN 201620465690U CN 205749379 U CN205749379 U CN 205749379U
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Abstract
The utility model discloses a kind of water content measuring instrument based on capacitance detecting principle, including control module, high-accuracy capacitor measurement module, matrix keyboard module, display module, Analog-digital Converter module and the distributed heating module being all connected with control module, and power supply；Also include capacitance type sensor probe and high accuracy distributed temperature sensing module, described capacitance type sensor probe is connected with control module by high-accuracy capacitor measurement module, and described high accuracy distributed temperature sensing module is connected with control module by Analog-digital Converter module；The back side that described distributed heating module is all popped one's head in capacitance type sensor with high accuracy distributed temperature sensing module is connected.This utility model provides the water content measuring instrument based on capacitance detecting principle that compact conformation, easy accessibility, making are easy, safe and reliable, practical, and not only certainty of measurement is high, and safety coefficient is high, and low cost, easy to carry, real-time continuous can be realized and measure.
Description
Technical field
This utility model relates to a kind of water content measuring instrument, particularly relates to a kind of water content measuring instrument based on capacitance detecting principle, belongs to high precision instrument instrument field.
Background technology
High-accuracy water content measurement instrument is a kind of conventional detecting instrument, has industry widely and the application of agricultural.In laboratory, often the water content in solid or liquid is detected, although precision is high, but use for laboratory detecting instrument volume is excessive, and can only carry out unitary sampling measurement.In gas station, the quality of oil is with water content has the biggest contact, and the too high meeting of water content causes firing of gasoline insufficient i.e. due to the high specific heat capacity of W/O, absorbs the heat of a large amount of gasoline combustion, damages cylinder.Agriculturally the storage of grain needs water content to control at a very low range to prevent grain from occurring Repiration to cause heating of germinateing because of hypervolia, it is therefore desirable to the water content in continuous detecting grain.And the large tank storage of edible oil is harsher for the measurement requirement of water content, the high water content in edible oil can directly result in the rapid spoilage of oil and lose use value.Therefore, water content measuring instrument device inherently has great application scenarios.
At present, being also widely used by the measuring method of weight difference before and after baking solid or liquid, weighing, this measuring method wastes time and energy.The cheap water content measuring instrument relative to use for laboratory instrument sold on existing market is then typically all and measures by the way of measuring resistance, its probe is on-insulated, measured sample is directly placed into probe two ends as conducting medium, although the electric current flowing through measuring probe is little, this kind of apparatus measures can not be used when however it is necessary that the high volatile liquid of some high risks of detection, and the precision of this kind of water content measuring instrument device is the highest, it is impossible to measure uninterruptedly.And use for laboratory water content measuring instrument volume is excessive, expensive.
So, develop a kind of portable, low cost, easy and simple to handle, in high precision, the measuring instrument being specifically designed to water content high-acruracy survey of high safety factor is necessary.
Utility model content
Main purpose of the present utility model is, overcomes deficiency of the prior art, it is provided that the water content measuring instrument based on capacitance detecting principle of a kind of new structure, is particularly well-suited to high-acruracy survey requirement.
Technical problem to be solved in the utility model is to provide the water content measuring instrument based on capacitance detecting principle that compact conformation, easy accessibility, making are easy, safe and reliable, practical, not only certainty of measurement is high, safety coefficient is high, and low cost, easy to carry, real-time continuous can be realized measure, have the value in industry.
In order to achieve the above object, this utility model be the technical scheme is that
A kind of water content measuring instrument based on capacitance detecting principle, including control module, the high-accuracy capacitor measurement module being all connected with control module, matrix keyboard module, display module, analog-digital conversion module and distributed heating module, and power supply；Also include capacitance type sensor probe and high accuracy distributed temperature sensing module, described capacitance type sensor probe is connected with control module by high-accuracy capacitor measurement module, and described high accuracy distributed temperature sensing module is connected with control module by analog-digital conversion module；The back side that described distributed heating module is all popped one's head in capacitance type sensor with high accuracy distributed temperature sensing module is connected.
This utility model is further arranged to: described control module uses MSP430F55299 single-chip microcomputer.
This utility model is further arranged to: described high-accuracy capacitor measurement module uses FDC2212 chip.
This utility model is further arranged to: described matrix keyboard module uses vertical 4 foot touch-switch.
This utility model is further arranged to: described display module uses TFT LCD.
This utility model is further arranged to: described analog-digital conversion module uses ADS1118 chip.
This utility model is further arranged to: the surface of described capacitance type sensor probe is provided with insulating barrier.
This utility model is further arranged to: described high accuracy distributed temperature sensing module includes that first module and second unit, described first module and second unit all include the first resistance, Zener diode, operational amplifier, the second resistance, audion, slide rheostat, the 4th resistance, temperature sensor and instrument amplifier.
Wherein, one end of described first resistance connects power supply, ground connection after the other end of the first resistance and Zener diode differential concatenation, the end that connects of the first resistance and Zener diode is connected by one end of operational amplifier and the second resistance, the described other end of the second resistance is connected with the base stage of audion, the emitter stage of described audion connect with slide rheostat after ground connection, the emitter stage of audion is connected with operational amplifier with the connection end of slide rheostat, the colelctor electrode of audion is connected with temperature sensor and instrument amplifier simultaneously, one end of described 4th resistance is simultaneously connected with temperature sensor and instrument amplifier, the other end of the 4th resistance connects power supply, the outfan of described instrument amplifier is connected with analog-digital conversion module.
This utility model is further arranged to: described operational amplifier uses OPA376 chip, and described instrument amplifier uses AD620 chip, and described temperature sensor uses PT100 temperature sensor.
This utility model is further arranged to: described distributed heating module includes that the first heating assembly, the second heating assembly and the 3rd heating assembly, described first heating assembly, the second heating assembly and the 3rd heating assembly all include Darlington triode, insulation film heating plate and the 5th resistance；The colelctor electrode of described Darlington triode connects power supply, and the emitter stage of Darlington triode connects one end of insulation film heating plate, the other end ground connection of insulation film heating plate, and the base stage of Darlington triode is connected with control module by the 5th resistance.
Compared with prior art, this utility model has the beneficial effect that
Pass through control module, high-accuracy capacitor measurement module, matrix keyboard module, display module, analog-digital conversion module and the setting of distributed heating module, and capacitance type sensor is popped one's head in and the setting of high accuracy distributed temperature sensing module, realize control module and read the both end voltage of high accuracy distributed temperature sensing module by analog-digital conversion module, and control distributed heating module make capacitance type sensor probe maintain steady temperature, and carry out data acquisition by reading the capacitance data that obtains of high-accuracy capacitor measurement module measurement, also by matrix keyboard module and display module complete with user mutual；Employing distributed temperature controls, the strict temperature jitter controlling capacitance type sensor probe, it is ensured that certainty of measurement is high, it is achieved measure the most in real time.
Foregoing is only the general introduction of technical solutions of the utility model, and in order to be better understood upon technological means of the present utility model, the utility model will be further described below in conjunction with the accompanying drawings.
Accompanying drawing explanation
Fig. 1 is the structural representation of a kind of water content measuring instrument based on capacitance detecting principle of this utility model；
Fig. 2 is the circuit diagram of high-accuracy capacitor measurement module in a kind of water content measuring instrument based on capacitance detecting principle of this utility model；
Fig. 3 is the circuit diagram of high accuracy distributed temperature sensing module in a kind of water content measuring instrument based on capacitance detecting principle of this utility model；
Fig. 4 is the circuit diagram of distributed heating module in a kind of water content measuring instrument based on capacitance detecting principle of this utility model.
Detailed description of the invention
Below in conjunction with Figure of description, this utility model is further described.
A kind of based on capacitance detecting principle water content measuring instrument as shown in Figure 1, including control module, high-accuracy capacitor measurement module, matrix keyboard module, display module, analog-digital conversion module and the distributed heating module being all connected with control module, and power supply；Also include capacitance type sensor probe and high accuracy distributed temperature sensing module, described capacitance type sensor probe is connected with control module by high-accuracy capacitor measurement module, and described high accuracy distributed temperature sensing module is connected with control module by analog-digital conversion module；The back side that described distributed heating module is all popped one's head in capacitance type sensor with high accuracy distributed temperature sensing module is connected.
As preferably, described control module uses MSP430F55299 single-chip microcomputer.
As preferably, described high-accuracy capacitor measurement module uses FDC2212 chip, i.e. U10 shown in Fig. 2, and 4 feet of U10,7 feet all meet VCC_+3.3V, and 8 feet meet GND；1 foot of crystal oscillator U11 is connected with 3 feet of FDC2212 chip, and 2 feet and 4 feet of U11 meet VCC_+3.3V and GND respectively, and 3 feet do not connect；11 feet of U10,12 feet do not connect, and 9 feet and 10 feet connect the electric capacity C1 two ends in parallel with inductance L1, and electric capacity C2 refers to capacitance type sensor probe, and the positive pole popped one's head in by capacitance type sensor and negative pole meet 9 feet and the GND of U10 respectively.Numerical portion, the 1 foot SCL of U10,2 foot SDA, 5 foot INTB, 6 foot SD connect P6.0, P6.1, P6.2, P6.3 mouth of MSP430F55299 single-chip microcomputer respectively, and wherein 1 foot and SCL and SDA that 2 feet are IIC communication bus connect pull-up resistor R13 and R12 to VCC_+3.3V.
As preferably, described matrix keyboard module uses vertical 4 foot touch-switch, and described display module uses TFT LCD, and described analog-digital conversion module uses ADS1118 chip.
As preferably, the surface of described capacitance type sensor probe is provided with insulating barrier, can make, by surface-coated insulating paint, integral insulation of popping one's head in, thus ensure the advanced security of detection, and it is wider to make it measure the scope of application.
As it is shown on figure 3, described high accuracy distributed temperature sensing module includes first module and the second unit that structure is identical, i.e. include two groups of temperature sensing devices；Each unit all includes the first resistance, Zener diode, operational amplifier, the second resistance, audion, slide rheostat, the 4th resistance, temperature sensor and instrument amplifier；One end of described first resistance connects power supply, ground connection after the other end of the first resistance and Zener diode differential concatenation, the end that connects of the first resistance and Zener diode is connected by one end of operational amplifier and the second resistance, the described other end of the second resistance is connected with the base stage of audion, the emitter stage of described audion connect with slide rheostat after ground connection, the emitter stage of audion is connected with operational amplifier with the connection end of slide rheostat, the colelctor electrode of audion is connected with temperature sensor and instrument amplifier simultaneously, one end of described 4th resistance is simultaneously connected with temperature sensor and instrument amplifier, the other end of the 4th resistance connects power supply, the outfan of described instrument amplifier is connected with analog-digital conversion module.
As it is shown on figure 3, described operational amplifier uses OPA376 chip, described instrument amplifier uses AD620 chip, and described temperature sensor uses PT100 temperature sensor.
For first module, power supply VCC_+5V is directly connected with GND by the first resistance R1 and C2V7 Zener diode D1, R1 with D1 is connected end and is connected with 3 feet of high precision operating amplifier OPA376 chip U0,4 feet and 7 feet of U0 are connected with VCC_-5V and VCC_+5V respectively, 1 foot of U0,5 feet and 8 feet do not connect, output pin 6 foot of U0 and the second resistance R2 connect, R2 another terminate the base stage of 9013 audion Q1, and emitter stage is connected with 2 feet and the 3rd resistance (slide rheostat) R3 one end of OPA376 chip U0 respectively, the slide rheostat R3 other end is connected with GND.PT100 temperature sensor U4 two ends are connected with 2 feet and 3 feet of instrument amplifier AD620 chip U1 and are concurrently accessed colelctor electrode and one end of the 4th resistance R4 of 9013 audion Q1, another termination VCC_+12V of R4 resistance, and 4 feet of instrument amplifier AD620 chip U1 and 7 feet meet VCC_-12V and VCC_+12V respectively, 5 feet of U1 meet GND, the 6 foot output AD1 of U1 connect 5 feet of ADS1118 Analog-digital Converter chip, 1 foot and 8 feet of U1 do not connect, first group of temperature sensing device is by changing the resistance of slide rheostat R3, make the current stabilization flowing through PT100 temperature sensor U4 at 20mA.Same annexation, for second unit that is second group temperature sensing device then by changing the resistance of slide rheostat R7 so that flow through the current stabilization of PT100 temperature sensor U5 at 20mA.
As shown in Figure 4, described distributed heating module includes the first heating assembly, the second heating assembly and the 3rd heating assembly, i.e. has three groups of heaters；Described first heating assembly, the second heating assembly and the 3rd heating assembly all include Darlington triode, insulation film heating plate and the 5th resistance；The colelctor electrode of described Darlington triode connects power supply, and the emitter stage of Darlington triode connects one end of insulation film heating plate, the other end ground connection of insulation film heating plate, and the base stage of Darlington triode is connected with control module by the 5th resistance.
As shown in Figure 4, for the first heating assembly, i.e. first group heater, the colelctor electrode of Darlington triode Q3 meets VCC_+12V, emitter stage connects one end of insulation film heating plate U7, another termination GND of U7, and the base stage of Q3 connects R9 resistance one end, R9 resistance other end Control1 connects the P2.4 mouth of single-chip microcomputer；Same, second group of heater, the colelctor electrode of Darlington triode Q4 meets VCC_+12V, emitter stage connects one end of insulation film heating plate U8, another termination GND of U8, and the base stage of Q4 connects R10 resistance one end, R10 resistance other end Control2 connects the P2.5 mouth of single-chip microcomputer；3rd group of heater, the colelctor electrode of Darlington triode Q5 meets VCC_+12V, and emitter stage connects one end of insulation film heating plate U9, another termination GND of U9, and the base stage of Q5 connects R11 resistance one end, and R11 resistance other end Control3 connects the P2.6 mouth of single-chip microcomputer.
Power supply of the present utility model obtains the DC voltage of+12V ,-12V ,+5V ,-5V and+3.3V again through over commutation, filtering, fixed ampllitude after can using civil power transformation, filtering via 10uF Yu 0.1uF shunt capacitance, the OPA376 chip, the AD620 chip of instrument amplifier employing, the FDC2212 chip of high-accuracy capacitor measurement module employing, the ADS1118 chip of analog-digital conversion module employing and the peripheral circuit that use to MSP430F5529 single-chip microcomputer, display module, matrix keyboard module, distributed heating plate, operational amplifier respectively are powered again.
Work process is: user selects to measure function by matrix keyboard, and input measurement controls steady temperature.After user controls temperature and function by the input of matrix keyboard module, single-chip microcomputer obtains high accuracy distributed temperature sensing module temperature data indirectly by the value reading analogue-to-digital converters, it is warming up to the steady temperature of user's input measurement through single-chip microcomputer internal control output controlled quentity controlled variable to control distributed heating plate, maintains capacitance type sensor probe temperature at design temperature；At this moment Single-chip Controlling high-accuracy capacitor measurement module is with the capacitance of output capacitance formula sensor probe, and obtain the water content value of tested sample to complete one-shot measurement according to the different indexing calculating mode computation within the different measuring funcall single-chip microcomputer of user's input, and i.e. continue or after single measurement conversion keys when user pushes button, repetition above procedure is read measured value by system continuously, and above-mentioned measurement process will show state the most in real time.
Innovative point of the present utility model is, uses distributed temperature to control, the strict temperature jitter controlling capacitance type sensor probe, it is ensured that certainty of measurement is high, it is achieved measure the most in real time.
The above, it it is only preferred embodiment of the present utility model, not this utility model is made any pro forma restriction, although this utility model is disclosed above with preferred embodiment, but it is not limited to this utility model, any those skilled in the art, in the range of without departing from technical solutions of the utility model, when the technology contents of available the disclosure above makes a little change or is modified to the Equivalent embodiments of equivalent variations, in every case it is the content without departing from technical solutions of the utility model, any simple modification above example made according to technical spirit of the present utility model, equivalent variations and modification, all still fall within the range of technical solutions of the utility model.
Claims (10)
1. a water content measuring instrument based on capacitance detecting principle, it is characterized in that: include control module, high-accuracy capacitor measurement module, matrix keyboard module, display module, analog-digital conversion module and the distributed heating module being all connected with control module, and power supply；Also include capacitance type sensor probe and high accuracy distributed temperature sensing module, described capacitance type sensor probe is connected with control module by high-accuracy capacitor measurement module, and described high accuracy distributed temperature sensing module is connected with control module by analog-digital conversion module；The back side that described distributed heating module is all popped one's head in capacitance type sensor with high accuracy distributed temperature sensing module is connected.
A kind of water content measuring instrument based on capacitance detecting principle the most according to claim 1, it is characterised in that: described control module uses MSP430F55299 single-chip microcomputer.
A kind of water content measuring instrument based on capacitance detecting principle the most according to claim 1, it is characterised in that: described high-accuracy capacitor measurement module uses FDC2212 chip.
A kind of water content measuring instrument based on capacitance detecting principle the most according to claim 1, it is characterised in that: described matrix keyboard module uses vertical 4 foot touch-switch.
A kind of water content measuring instrument based on capacitance detecting principle the most according to claim 1, it is characterised in that: described display module uses TFT LCD.
A kind of water content measuring instrument based on capacitance detecting principle the most according to claim 1, it is characterised in that: described analog-digital conversion module uses ADS1118 chip.
A kind of water content measuring instrument based on capacitance detecting principle the most according to claim 1, it is characterised in that: the surface of described capacitance type sensor probe is provided with insulating barrier.
A kind of water content measuring instrument based on capacitance detecting principle the most according to claim 1, it is characterized in that: described high accuracy distributed temperature sensing module includes that first module and second unit, described first module and second unit all include the first resistance, Zener diode, operational amplifier, the second resistance, audion, slide rheostat, the 4th resistance, temperature sensor and instrument amplifier；
One end of described first resistance connects power supply, ground connection after the other end of the first resistance and Zener diode differential concatenation, the end that connects of the first resistance and Zener diode is connected by one end of operational amplifier and the second resistance, the described other end of the second resistance is connected with the base stage of audion, the emitter stage of described audion connect with slide rheostat after ground connection, the emitter stage of audion is connected with operational amplifier with the connection end of slide rheostat, the colelctor electrode of audion is connected with temperature sensor and instrument amplifier simultaneously, one end of described 4th resistance is simultaneously connected with temperature sensor and instrument amplifier, the other end of the 4th resistance connects power supply, the outfan of described instrument amplifier is connected with analog-digital conversion module.
A kind of water content measuring instrument based on capacitance detecting principle the most according to claim 8, it is characterised in that: described operational amplifier uses OPA376 chip, and described instrument amplifier uses AD620 chip, and described temperature sensor uses PT100 temperature sensor.
A kind of water content measuring instrument based on capacitance detecting principle the most according to claim 1, it is characterized in that: described distributed heating module includes that the first heating assembly, the second heating assembly and the 3rd heating assembly, described first heating assembly, the second heating assembly and the 3rd heating assembly all include Darlington triode, insulation film heating plate and the 5th resistance；
The colelctor electrode of described Darlington triode connects power supply, and the emitter stage of Darlington triode connects one end of insulation film heating plate, the other end ground connection of insulation film heating plate, and the base stage of Darlington triode is connected with control module by the 5th resistance.
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| CN201620465690.2U CN205749379U (en) | 2016-05-20 | 2016-05-20 | A kind of water content measuring instrument based on capacitance detecting principle |
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| CN201620465690.2U CN205749379U (en) | 2016-05-20 | 2016-05-20 | A kind of water content measuring instrument based on capacitance detecting principle |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107621484A (en) * | 2017-08-31 | 2018-01-23 | 苏州麦喆思科电子有限公司 | A kind of hand-held sugar measuring instrument |
| CN109781209A (en) * | 2019-03-01 | 2019-05-21 | 杭州依美洛克医学科技有限公司 | Liquid relief and liquid level detection circuit |
| CN114152402A (en) * | 2022-02-07 | 2022-03-08 | 中国空气动力研究与发展中心低速空气动力研究所 | Wind tunnel test water content measuring device |
| CN115971691A (en) * | 2023-03-21 | 2023-04-18 | 济南森峰激光科技股份有限公司 | Capacitive distance measurement system and method for laser cutting |
-
2016
- 2016-05-20 CN CN201620465690.2U patent/CN205749379U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107621484A (en) * | 2017-08-31 | 2018-01-23 | 苏州麦喆思科电子有限公司 | A kind of hand-held sugar measuring instrument |
| CN109781209A (en) * | 2019-03-01 | 2019-05-21 | 杭州依美洛克医学科技有限公司 | Liquid relief and liquid level detection circuit |
| CN109781209B (en) * | 2019-03-01 | 2023-12-08 | 杭州依美洛克医学科技有限公司 | Pipetting and liquid level detection circuit |
| CN114152402A (en) * | 2022-02-07 | 2022-03-08 | 中国空气动力研究与发展中心低速空气动力研究所 | Wind tunnel test water content measuring device |
| CN115971691A (en) * | 2023-03-21 | 2023-04-18 | 济南森峰激光科技股份有限公司 | Capacitive distance measurement system and method for laser cutting |
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