CN101695001A - Array piezoresistive tactile sensor adopting voltage array feedback method to weaken return circuit interference of scanning circuits - Google Patents
Array piezoresistive tactile sensor adopting voltage array feedback method to weaken return circuit interference of scanning circuits Download PDFInfo
- Publication number
- CN101695001A CN101695001A CN 200910308861 CN200910308861A CN101695001A CN 101695001 A CN101695001 A CN 101695001A CN 200910308861 CN200910308861 CN 200910308861 CN 200910308861 A CN200910308861 A CN 200910308861A CN 101695001 A CN101695001 A CN 101695001A
- Authority
- CN
- China
- Prior art keywords
- circuit
- signal
- signal output
- connects
- array
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Landscapes
- Analogue/Digital Conversion (AREA)
- Electronic Switches (AREA)
Abstract
An array piezoresistive tactile sensor adopting voltage array feedback method to weaken return circuit interference of scanning circuits belongs to the field of array piezoresistive tactile sensors. The sensor solves the problem of a return circuit interference of a scanning circuit in the array piezoresistive tactile sensor, simultaneously realizes the more simple circuit. The sensor weakens the return circuit interference of the line scanning circuit of the array piezoresistive tactile sensor after transferring output voltage signals of the current scanning line on a signal collecting flexible circuit board to a switch circuit and an amplifier circuit, namely the signals are divided into two paths, one path of the signals are converted into the digital quantity through an ADC circuit, thereby realizing collecting the tactile sense information, the other path of the signals are fed back into non-sampling array electrodes through a first analog signal output storage and analog switch, and a logical control circuit controls a multiway switch to provide standard high voltage for the current scanning line on the tactile sense signal collecting flexible circuit board. The array piezoresistive tactile sensor can effectively weaken the return circuit interference of scanning circuits.
Description
Technical field
The present invention relates to a kind of voltage row feedback transmitter that adopts and weaken the array piezoresistive tactile sensor that disturb in the scanning circuit loop, belong to the array piezoresistive tactile sensor.
Background technology
Existing array piezoresistive tactile sensor adopts the form of rank scanning to carry out the collection of signal, and it can reduce the quantity of touch sensor external lead wire effectively.But when reducing external lead wire, inevitably produce the loop interference problem of rank scanning circuit again.The existing method of disturbing in the loop of eliminating has: it is integrated to utilize silicon technology that haptic unit is carried out preliminary treatment, makes integrated circuit integrated with transducer and be connected in series diode, and this method makes the sensor production cost up, and makes touch sensor shortage compliance; Adopt the method for Voltage Feedback in addition, this method feeds back to non-current scan line and non-current scan columns simultaneously by the output voltage with current scan columns, though can effectively weakening the loop of scanning circuit, it disturbs, do not influence simultaneously the compliance of touch sensor, but realize that circuit is very complicated, influenced the reliability of whole system and the microminiaturization of treatment circuit.
Summary of the invention
The purpose of this invention is to provide a kind of voltage row feedback transmitter that adopts and weaken the array piezoresistive tactile sensor that disturb in the scanning circuit loop, in the loop interference problem of its scanning circuit in having solved the array piezoresistive tactile sensor, make and realize that circuit is simpler.
The present invention includes haptic signal and gather flexible PCB, it also comprises switching circuit, amplifier circuit, adc circuit, DAC circuit, the first analog signal output register, the second analog signal output register, logic control circuit, variable connector, analog switch and a plurality of comparison resistance
The benchmark low-voltage output of logic control circuit connects the digital signal input end of DAC circuit, the analog signal output of DAC circuit connects the input end of analog signal of the second analog signal output register, the analog signal output of the second analog signal output register connects an end of each comparison resistance, the other end of each comparison resistance connects the sampled signal row lead-in wire end points that haptic signal is gathered flexible PCB respectively, each row voltage signal input of haptic signal collection flexible PCB connects a benchmark high-voltage signal output of variable connector respectively, the capable signal input end of variable connector connects the capable control signal output ends of logic control circuit, is used for the current scan line of gating haptic signal collection flexible PCB and provides the benchmark high voltage for current scan line;
Each sampled signal that haptic signal is gathered flexible PCB is listed as the sampled signal input that lead-in wire end points connects switching circuit respectively, is used for gathering the voltage output signal that haptic signal is gathered the current scan columns of flexible PCB; The sampled signal output of switching circuit connects the sampled signal input of amplifier circuit, the sampled signal output of amplifier circuit connects the input end of analog signal of adc circuit and the feedback signal input of the first analog signal output register respectively, and the digital signal output end of adc circuit connects the sampled signal input of logic control circuit; The feedback signal output of the first analog signal output register connects the feedback signal input of analog switch, each feedback signal output of analog switch connects the sampled signal row lead-in wire end points that haptic signal is gathered flexible PCB respectively, the signal input end of analog switch connects the row control signal output ends of logic control circuit, is used for feeding back to the non-current scan columns that haptic signal is gathered flexible PCB to the gating of non-current scan columns and with feedback signal.
Advantage of the present invention is:
The problem that the scan loop that the present invention adopts the method for voltage row feedback to solve the array piezoresistive tactile sensor disturbs, it gives non-current scan columns with the Voltage Feedback of current scan columns in the scanning circuit, make non-current scan columns can not constitute the loop conducting, removed of the interference of non-current scan columns, made the result of scanning more accurate current scan columns loop.Owing to it only needs the Voltage Feedback of current scan columns is given non-current scan columns and needn't be fed back to non-current scan line simultaneously, make the complexity ratio of realizing circuit realize that the complexity of the circuit of Voltage Feedback method reduces about 50% simultaneously.
Description of drawings
Fig. 1 is an overall structure schematic diagram of the present invention; The overall structure schematic diagram of Fig. 2 embodiment of the present invention three; Fig. 3 is the structural representation that haptic signal is gathered flexible PCB; Fig. 4 is the equivalent circuit diagram of single haptic unit; Fig. 5 is the equivalent circuit diagram that haptic signal is gathered four adjacent haptic unit on the flexible PCB when not adopting voltage row feedback transmitter; Fig. 6 is that haptic signal is gathered the equivalent circuit diagram of four adjacent haptic unit on the flexible PCB when adopting voltage row feedback transmitter; Fig. 7 is an acquisition process flow chart of haptic signal being gathered the signal of the capable j row of i haptic unit on the flexible PCB; Fig. 8 is the voltage output curve diagram of adjacent four haptic unit on the mask voltage row feedback after touch signals collecting flexible PCB; Haptic signal was gathered the voltage output curve diagram of adjacent four haptic unit on the flexible PCB when Fig. 9 was applied voltage row feedback.
Embodiment
Embodiment one: present embodiment is described below in conjunction with Fig. 1, Fig. 3 Fig. 9, present embodiment comprises haptic signal collection flexible PCB 5, it also comprises switching circuit 1-1, amplifier circuit 1-2, adc circuit 1-3, DAC circuit 1-4, the first analog signal output register 1-5, the second analog signal output register 1-6, logic control circuit 1-7, variable connector 2, analog switch 3 and a plurality of comparison resistance 4
The benchmark low-voltage output of logic control circuit 1-7 connects the digital signal input end of DAC circuit 1-4, the analog signal output of DAC circuit 1-4 connects the input end of analog signal of the second analog signal output register 1-6, the analog signal output of the second analog signal output register 1-6 connects an end of each comparison resistance 4, the other end of each comparison resistance 4 connects the sampled signal row lead-in wire end points that haptic signal is gathered flexible PCB 5 respectively, each row voltage signal input of haptic signal collection flexible PCB 5 connects a benchmark high-voltage signal output of variable connector 2 respectively, the capable signal input end of variable connector 2 connects the capable control signal output ends of logic control circuit 1-7, is used for the current scan line of gating haptic signal collection flexible PCB 5 and provides the benchmark high voltage for current scan line;
Each sampled signal that haptic signal is gathered flexible PCB 5 is listed as the sampled signal input that lead-in wire end points connects switching circuit 1-1 respectively, is used for gathering the voltage output signal that haptic signal is gathered flexible PCB 5 current scan columns; The sampled signal output of switching circuit 1-1 connects the sampled signal input of amplifier circuit 1-2, the sampled signal output of amplifier circuit 1-2 connects the input end of analog signal of adc circuit 1-3 and the feedback signal input of the first analog signal output register 1-5 respectively, and the digital signal output end of adc circuit 1-3 connects the sampled signal input of logic control circuit 1-7; The feedback signal output of the first analog signal output register 1-5 connects the feedback signal input of analog switch 3, each feedback signal output of analog switch 3 connects the sampled signal row lead-in wire end points that haptic signal is gathered flexible PCB 5 respectively, the signal input end of analog switch 3 connects the row control signal output ends of logic control circuit 1-7, is used for feeding back to the non-current scan columns that haptic signal is gathered flexible PCB 5 to the gating of non-current scan columns and with feedback signal.
Haptic signal is gathered the measurement and the acquisition principle of haptic signal on the flexible PCB 5: choose a haptic unit among Fig. 3 arbitrarily, it is made up of the electrode pair of sensitive material and its below, and sensitive material is as a variable resistor r
I, j, when sensitive material is subjected to positive pressure F, r
I, jResistance will reduce.By detection reference reference resistance R
RefThe magnitude of voltage V at two ends
OutCan obtain variable resistor r indirectly
I, jResistance, by r
I, jResistance so that obtain pressure F.Its equivalent circuit diagram as shown in Figure 4.
The loop is disturbed and is produced reason:
In order to reduce the external lead wire of touch sensor, the electrode series connection that haptic signal is gathered a plurality of haptic unit on the flexible PCB 5 realizes the array layout.Shown in Figure 5, when the capable j row of scanning i electrode, promptly the capable benchmark high voltage Vdd that applies of i gathers the voltage of j row and exports, and is to haptic unit C (i, r j) in theory
I, jMeasure, in fact Ci Shi loop is r
I, j-1, r
I+1, j-1And r
I+1, jThe series loop of forming again with r
I, jIn parallel formed, the Vout that record this moment is not only the output voltage V out in the independent equivalent electric circuit as shown in Figure 4, and it is subjected to r
I, j-1, r
I+1, j-1And r
I+1, jThe influence of the series loop of forming suppose that (i, j) pressurized not, and in addition during three haptic unit pressurizeds have bigger electric current and cause the variation of Vout by the loop haptic unit C, and the voltage output value that records at this moment is not really by r
I, jThe voltage output value of the loop generation that constitutes separately, this causes r
I, jIts actual value of indirect measurement substantial deviation.
The present invention adopts voltage row feedback transmitter: the output voltage V out passing ratio amplifier of current scan columns is fed back to non-current scan columns, and non-current scan line electrode is floating empty, has formed the equipotential network like this between the row electrode in theory, has cut off the interference loop.Classify j row as establishing current scanning among Fig. 6, its output voltage V out is fed back to the j-1 row, realize j row and j-1 row equipotential.By above-mentioned analysis to Fig. 5 as can be known, under the situation that is not having voltage row feedback, to r
I, jWhen measuring, circuit loop is by r
I, j-1, r
I+1, j-1And r
I+1, jThe series loop of forming again with r
I, jIn parallel formation feeds back to the j-1 row with current output voltage Vout, makes the r shown in Fig. 6
I+1, j-1Lower end and r
I+1, jThe lower end formed equipotential, former r
I, j-1, r
I+1, j-1And r
I+1, jThe series loop of forming is cut off, and no longer the output voltage to current scan columns causes interference.In like manner the voltage output value with current scan columns feeds back to all non-current scan columns, cuts off all formed loops of non-current scan columns, removes working as column scan row output voltage influence.
Because the performance impact of proportional amplifier has the electric current of the trace r that flows through
I+1, j-1And r
I+1, jSo voltage row feedback transmitter can be eliminated the loop in theory and disturb, disturb and can only weaken the loop during practical application.Checking by experiment, this method can weaken the loop effectively and disturb in the application of reality.Show by emulation experiment that simultaneously the resulting scanning voltage output valve of voltage row feedback transmitter of the present invention is higher than the accuracy of the magnitude of voltage of Voltage Feedback method output.
The course of work: at first default benchmark low voltage value is exported after DAC circuit 1-4 carries out digital-to-analogue conversion by logic control circuit 1-7, through the end of the second analog signal register 1-6 output reference low-voltage at a plurality of equivalent resistances 4, the benchmark high voltage of current scan line is controlled variable connector 2 by logic control circuit 1-7 and is provided on the haptic signal collection flexible PCB 5, to load upward benchmark high voltage with current scan line pairing a tunnel in the variable connector 2 by control, make current scan columns conducting, the sampled signal row lead-in wire end points that the output voltage V out of current scan columns gathers flexible PCB 5 by haptic signal on the haptic signal collection flexible PCB 5 inputs to switching circuit 1-1, output voltage V out is fed back to haptic signal through analog switch 3 again and gather a plurality of non-current scan columns on the flexible PCB 5, the gating of non-current scan columns is controlled by logic control circuit 1-7 in the analog switch 3.The voltage signal of gathering flexible PCB 6 outputs by haptic signal divides two-way behind switching circuit 1-1 and amplifier circuit 1-2PGA: the one tunnel is converted to digital quantity through analog to digital conversion circuit, realizes the collection of tactile data; Another road first analog signal output register 1-5 and analog switch 3 feed back to non-sampling row electrode, realize sampled voltage row feedback, and disturb in the loop that weakens array touch sensor rank scanning circuit.
Haptic signal collection flexible PCB 5 pressure signal that sensitive material is suffered is converted to voltage signal and exports; Amplifier circuit 1-2 is used to weaken the influence of subsequent conditioning circuit to the analog voltage signal of input, can improve driving force.
By Fig. 8 and the voltage output curve diagram that Figure 9 shows that corresponding with Fig. 5 and Fig. 6 respectively adjacent four haptic unit, get haptic unit C (i, j) pressurized not, and the situation of other three haptic unit pressurizeds, by contrast as can be seen, adopt voltage row feedback back voltage output value to be approximately straight line, be not subjected to the interference in other loop, illustrate that the present invention weakens effectively to have gone the loop interference of column scan circuit.
Embodiment two: the difference of present embodiment and execution mode one is that it also comprises SPIM interface circuit 1-8, and the sampled signal output of the sampled signal input connection logic control circuit 1-7 of SPIM interface circuit 1-8 is used for the communication with host computer.Other composition and annexation are identical with execution mode one.
Embodiment three: below in conjunction with Fig. 2 present embodiment is described, the difference of present embodiment and execution mode two is that described switching circuit 1-1, amplifier circuit 1-2, adc circuit 1-3, DAC circuit 1-4, the first analog signal output register 1-5, the second analog signal output register 1-6, logic control circuit 1-7 and SPIM interface circuit 1-8 are integrated in the inside of the programmable SOC (system on a chip) 1 of PSoC mixed signal array.Other composition and annexation are identical with execution mode two.
Adopt the programmable SOC (system on a chip) 1 of PSoC mixed signal array as main process chip in the present embodiment, by voltage row feedback transmitter, when effectively weakening the interference of touch sensor scanning circuit loop, simplified circuit structure, part peripheral circuit function is integrated into main process chip inside, further reduce the complexity of peripheral circuit, improved the integrated level and the reliability of whole system.
Embodiment four: the difference of present embodiment and execution mode three is that the programmable SOC (system on a chip) 1 of described PSoC mixed signal array adopts the CY8C24423A-24LFXI chip of Sai Pulasi company.Other composition and annexation are identical with execution mode three.
In the present embodiment, haptic signal shown in Figure 3 is gathered the distribution that 36 electrode pairs 6 on the flexible PCB 5 are determined row and column respectively, join on electrode pair that D05-D12 among Fig. 2 and the corresponding and definite respectively row and column of D00-D04 are distributed 6 is electric.
That variable connector 2 adopts is MAX4781, is the CMOS analog multiplexer/switch with high speed, low-voltage, low on-resistance, encapsulation 16thin QFN; Analog switch 3 adopts the two single pole single throw of the ISL43L121 of Intersil company, the closed type analog switch, and its characteristics are: conducting resistance is about 0.16 Ω; Reference resistance Rref adopts the precision resistance of 100K; Haptic signal is gathered flexible PCB 5 and is processed by double-deck flexible PCB.
The multi-way switch circuit 1-1 of programmable SOC (system on a chip) 1 internal build of PSoC mixed signal array realizes the switching of path by writing the mode of register ABF_CRO and AMX_IN; Amplifier circuit 1-2 is a proportional amplifier able to programme, and amplification coefficient is set to 1; Adc circuit 1-3 selects ∑-Δ type of 8 for use, has very low sampling resolution (1) and very high sampling rate, with analog signal digital, utilizes oversampling technique, noise shaping and digital filtering technique to increase effective resolution; The adjustable reference low-voltage that DAC circuit 1-4 provides behind the second analog signal register 1-6 by P0[3] put on the end of five reference resistance Rref, and the other end of reference resistance connects D00, D01, D02, D03 and D04 respectively.The effect of benchmark low pressure be for the haptic signal that guarantees to export in the linear working range of amplifier.
Claims (4)
1. one kind is adopted voltage row feedback transmitter to weaken the array piezoresistive tactile sensor that disturb in the scanning circuit loop, it comprises haptic signal collection flexible PCB (5), it is characterized in that: it also comprises switching circuit (1-1), amplifier circuit (1-2), adc circuit (1-3), DAC circuit (1-4), the first analog signal output register (1-5), the second analog signal output register (1-6), logic control circuit (1-7), variable connector (2), analog switch (3) and a plurality of comparison resistance (4)
The benchmark low-voltage output of logic control circuit (1-7) connects the digital signal input end of DAC circuit (1-4), the analog signal output of DAC circuit (1-4) connects the input end of analog signal of the second analog signal output register (1-6), the analog signal output of the second analog signal output register (1-6) connects an end of each comparison resistance (4), the other end of each comparison resistance (4) connects the sampled signal row lead-in wire end points that haptic signal is gathered flexible PCB (5) respectively, each row voltage signal input of haptic signal collection flexible PCB (5) connects a benchmark high-voltage signal output of variable connector (2) respectively, the capable signal input end of variable connector (2) connects the capable control signal output ends of logic control circuit (1-7), is used for the current scan line of gating haptic signal collection flexible PCB (5) and provides the benchmark high voltage for current scan line;
Each sampled signal that haptic signal is gathered flexible PCB (5) is listed as the sampled signal input that lead-in wire end points connects switching circuit (1-1) respectively, is used for gathering the voltage output signal that haptic signal is gathered the current scan columns of flexible PCB (5); The sampled signal output of switching circuit (1-1) connects the sampled signal input of amplifier circuit (1-2), the sampled signal output of amplifier circuit (1-2) connects the input end of analog signal of adc circuit (1-3) and the feedback signal input of the first analog signal output register (1-5) respectively, and the digital signal output end of adc circuit (1-3) connects the sampled signal input of logic control circuit (1-7); The feedback signal output of the first analog signal output register (1-5) connects the feedback signal input of analog switch (3), each feedback signal output of analog switch (3) connects the sampled signal row lead-in wire end points that haptic signal is gathered flexible PCB (5) respectively, the signal input end of analog switch (3) connects the row control signal output ends of logic control circuit (1-7), is used for feeding back to the non-current scan columns that haptic signal is gathered flexible PCB (5) to the gating of non-current scan columns and with feedback signal.
2. employing voltage row feedback transmitter according to claim 1 weakens the array piezoresistive tactile sensor that disturb in the scanning circuit loop, it is characterized in that: it also comprises SPIM interface circuit (1-8), and the sampled signal output of the sampled signal input connection logic control circuit (1-7) of SPIM interface circuit (1-8) is used for the communication with host computer.
3. employing voltage row feedback transmitter according to claim 2 weakens the array piezoresistive tactile sensor that disturb in the scanning circuit loop, and it is characterized in that: described switching circuit (1-1), amplifier circuit (1-2), adc circuit (1-3), DAC circuit (1-4), the first analog signal output register (1-5), the second analog signal output register (1-6), logic control circuit (1-7) and SPIM interface circuit (1-8) are integrated in the inside of the programmable SOC (system on a chip) of PSoC mixed signal array (1).
4. employing voltage row feedback transmitter according to claim 3 weakens the array piezoresistive tactile sensor that disturb in the scanning circuit loop, it is characterized in that: the described programmable SOC (system on a chip) of PSoC mixed signal array (1) adopts the CY8C24423A-24LFXI chip of Sai Pulasi company.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200910308861 CN101695001B (en) | 2009-10-27 | 2009-10-27 | Array piezoresistive tactile sensor adopting voltage array feedback method to weaken return circuit interference of scanning circuits |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200910308861 CN101695001B (en) | 2009-10-27 | 2009-10-27 | Array piezoresistive tactile sensor adopting voltage array feedback method to weaken return circuit interference of scanning circuits |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101695001A true CN101695001A (en) | 2010-04-14 |
| CN101695001B CN101695001B (en) | 2013-02-13 |
Family
ID=42093948
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200910308861 Expired - Fee Related CN101695001B (en) | 2009-10-27 | 2009-10-27 | Array piezoresistive tactile sensor adopting voltage array feedback method to weaken return circuit interference of scanning circuits |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101695001B (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102322974A (en) * | 2011-06-03 | 2012-01-18 | 东南大学 | Array temperature touch sensing device |
| CN104635562A (en) * | 2013-11-13 | 2015-05-20 | 沈阳新松机器人自动化股份有限公司 | Touch sensor, touch sensing system and intelligent robot |
| CN105675024A (en) * | 2016-01-04 | 2016-06-15 | 东南大学 | Data reading method and device for resistance sensor array |
| CN111817708A (en) * | 2020-07-22 | 2020-10-23 | 曾洁 | Double-layer layout signal processing flexible circuit board |
| CN113483923A (en) * | 2021-07-06 | 2021-10-08 | 杭州电子科技大学 | Conditioning circuit and method for solving signal crosstalk and multipoint detection of flexible array piezoresistive sensor |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7598949B2 (en) * | 2004-10-22 | 2009-10-06 | New York University | Multi-touch sensing light emitting diode display and method for using the same |
| US7609178B2 (en) * | 2006-04-20 | 2009-10-27 | Pressure Profile Systems, Inc. | Reconfigurable tactile sensor input device |
| CN101426315B (en) * | 2008-12-02 | 2013-04-17 | 广州市设计院 | Array type wire laying lighting control system |
-
2009
- 2009-10-27 CN CN 200910308861 patent/CN101695001B/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102322974A (en) * | 2011-06-03 | 2012-01-18 | 东南大学 | Array temperature touch sensing device |
| CN104635562A (en) * | 2013-11-13 | 2015-05-20 | 沈阳新松机器人自动化股份有限公司 | Touch sensor, touch sensing system and intelligent robot |
| CN105675024A (en) * | 2016-01-04 | 2016-06-15 | 东南大学 | Data reading method and device for resistance sensor array |
| CN105675024B (en) * | 2016-01-04 | 2018-01-02 | 东南大学 | A kind of data read method, the device of resistive sensor array |
| CN111817708A (en) * | 2020-07-22 | 2020-10-23 | 曾洁 | Double-layer layout signal processing flexible circuit board |
| CN113483923A (en) * | 2021-07-06 | 2021-10-08 | 杭州电子科技大学 | Conditioning circuit and method for solving signal crosstalk and multipoint detection of flexible array piezoresistive sensor |
| CN113483923B (en) * | 2021-07-06 | 2023-01-13 | 杭州电子科技大学 | Conditioning circuit and method for solving signal crosstalk and multipoint detection of flexible array piezoresistive sensor |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101695001B (en) | 2013-02-13 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101695001B (en) | Array piezoresistive tactile sensor adopting voltage array feedback method to weaken return circuit interference of scanning circuits | |
| CN103791944B (en) | A kind of high-accuracy general measurement apparatus | |
| CN107631818A (en) | Flexible array pressure measurement sensor and its measuring method based on piezoresistive effect | |
| CN101917196B (en) | Analog-to-digital joint type data acquisition device | |
| CN103647901A (en) | Low-cost image data collection transmission system free of external storage and based on field programmable gate array (FPGA) | |
| CN103604982A (en) | PXI micro-current detection device | |
| CN102495354B (en) | Testing method for circuit board testing system | |
| CN103995024A (en) | Measure method applied to circuit of resistor-type moisture measure sensor | |
| CN204667117U (en) | A kind of based on the adaptive analog quantity detecting device of general A/D sensing range | |
| CN206002882U (en) | A kind of multiple sensor signal acquisition circuit based on ADS7823 | |
| CN103413747A (en) | Space plasma measuring device | |
| CN201682485U (en) | Analog-to-digital combined data acquisition device | |
| CN104950773B (en) | Mixed type intelligent data acquisition processing unit | |
| CN103235203B (en) | There is the acquisition method of the multichannel analog signals acquisition system of automatic compensation function | |
| CN203502091U (en) | In-situ detection device for fuel quantity sensor | |
| CN103558787A (en) | Multichannel configurable isolated scanning A/D module | |
| CN206400612U (en) | A kind of multi-analog digitized sampling circuit | |
| CN205265663U (en) | Acquisition circuit is kept apart to high accuracy analog quantity | |
| CN103439584B (en) | Capacitor with multiple electrode plates on-line measurement system based on electric impedance analyzer | |
| CN204287285U (en) | Capture card measured by a kind of multimeter | |
| CN207718203U (en) | A kind of 24 channel 4-20mA data collectors of full isolation | |
| Li et al. | Low-cost CMOS interface for capacitive sensors and its application in a capacitive angular encoder | |
| CN201926940U (en) | Multi-path temperature control device for ion migration spectrometer | |
| CN101477142B (en) | Weak signal multimeter body with switch function according to user connection and its use method | |
| CN203396846U (en) | Multi-pole plate capacitance on-line measuring system based on impedance analyzer |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130213 Termination date: 20131027 |