CN106441403A - Method for zeroing initial null voltage of bridge sensor - Google Patents
Method for zeroing initial null voltage of bridge sensor Download PDFInfo
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- CN106441403A CN106441403A CN201610831805.XA CN201610831805A CN106441403A CN 106441403 A CN106441403 A CN 106441403A CN 201610831805 A CN201610831805 A CN 201610831805A CN 106441403 A CN106441403 A CN 106441403A
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- zero
- zeroing
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- resistance
- bridge
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D18/00—Testing or calibrating apparatus or arrangements provided for in groups G01D1/00 - G01D15/00
Abstract
The invention discloses a method for zeroing the initial null voltage of a bridge sensor. The method comprises a step 1 of accurately measuring the Wheatstone bridge initial null voltage, the input resistance and the output resistance of the bridge sensor before the bridge sensor is fabricated and packaged; a step 2 of calculating the average resistance of the bridge sensor; a step 3 of calculating zeroing resistance connected in parallel with an arm with higher potential; a step 4 of forming a zeroing resistor with the required resistance by means of series connection or parallel connection from a zeroing resistor sequence; a step 5 of connecting the zeroing resistor in parallel to the arm with the higher potential, and completing the package test of the bridge sensor. In the invention, an external zeroing method of the sensor is transformed into an internal zeroing method, and a zeroing test and production are carried out by a sensor manufacturer. When using the bridge sensor, the user does not need to zero the bridge sensor anymore. A high receiving degree is achieved. Compared with the zeroing of an external parallel potentiometer, the method is stable and reliable in connection and prolongs a service life.
Description
Technical field
The present invention relates to sensor field, more particularly a kind of bridge type magnetic sensor initial zero position voltage adjusting zero method.
Background technology
With the development further of microelectric technique and computer, the application of micro-cantilever bridge type magnetic sensor is more and more general
Time, it is widely used in space flight, aviation, petrochemical industry, dynamic power machine, biomedical engineering, meteorology, geology, seismic survey etc.
Every field.Now, the accurate measurement of piezoresistive bridge sensor to be realized is particularly important with real-time monitoring.Bridge type magnetic sensor
It is important family in sensor family, the measurement of a lot of physical quantitys such as pressure, load, strain, acceleration, displacement etc., frequently with
The sensor of bridge-type principle.Due to many reasons（As when MEMS technology makes arm resistance, ion distribution inequality causes resistance big
Little different）, when input is when being measured as zero, its output is not zero, that is, there is zero point.It is typically due to cantilever beam bridge-type sensing
The voltage signal of device output is very faint, needs to carry out follow-up processing and amplifying to voltage signal, if initial zero position voltage is excessive
Operational amplifier saturation is caused then to be unable to reach the requirement of accurate measurement.How zero-point voltage to be controlled in acceptable scope
Interior, can there are multiple methods, generally have two class of hardware and software.Hardware zeroing is directly eliminated zero point using appropriate circuit,
He can have again be divided into hand adjustment zeroing and Automatic Program zeroing.Zero point actually " is remembered " in software zeroing, then data processing again
In eliminated.
Content of the invention
1st, the purpose of the present invention.
Before bridge type magnetic sensor encapsulation is dispatched from the factory, the initial zero position voltage zeroing work of bridge type magnetic sensor is completed, user uses
Shi Buzai needs to return to zero again.
2nd, the technical solution adopted in the present invention.
Bridge type magnetic sensor initial zero position voltage adjusting zero method proposed by the present invention, is carried out in accordance with the following steps：
Step 1, bridge type magnetic sensor make encapsulation before, the Wheatstone bridge initial zero position voltage of accurate measurement sensor, defeated
Enter resistance, output resistance：
Wherein、、、For four arm resistances of Wheatstone bridge,For supply voltage,For zero-bit output voltage；
Step 2, the average resistance size of calculating sensor：
The zero-regulator resistor of the higher brachium pontis parallel connection of step 3, calculating current potential：
Step 4, go out the zero-regulator resistor of required resistance from serial or parallel connection zero-regulator resistor sequence；
Step 5, by zero-regulator resistorThe higher brachium pontis of current potential is connected in parallel on, and completes the packaging and testing of sensor.
Further in specific embodiment, in described step 3：
Available
.
Further in specific embodiment, described zero-regulator resistor is non-pressure sensitive, does not become with sensor input signal
Change and change.
3rd, beneficial effects of the present invention.
（1）Sensor external adjusting zero method is changed into internal adjusting zero method by the present invention, by sensor production manufacturer
Complete zeroing test and make, user using when no longer need to return to zero again, receiving degree height；
（2）Adjusting zero method proposed by the present invention is more easy compared with other schemes, it is only necessary to measures three physical quantitys and can determine that tune
The size of zero resistance resistance；
（3）The present invention increased service life with respect in the zeroing of parallel connection outside potentiometer, the method stable connection reliability；
（4）The present invention is easy to sensor overall package, improves anti high overload ability.
（5）Inventive sensor needs after completing to demarcate, and returns to zero compared to after transducer calibration, by zeroing circuit and
Electric bridge sealing is demarcated together afterwards contributes to obtaining bridge type magnetic sensor more accurately sensitivity, the index such as non-linear.
Description of the drawings
Fig. 1 is circuit diagram of the bridge type magnetic sensor in the case of not having to return to zero；
Fig. 2 be bridge type magnetic sensor by the circuit diagram after the inventive method determines zero-regulator resistor R, R represent 1-3 resistor coupled in parallel or
Resistance after series connection.
Specific embodiment
Embodiment 1
The present invention provides a kind of method of the zeroing that reliable and stable can be rapidly completed bridge type magnetic sensor, and specific embodiment is such as
Under：
Four arm resistances of Wheatstone bridge are、、、, using direct current supply, supply voltage is, zero-bit output
Voltage is, when sensor input signal is zero, have
WhenWhen, that is, there is total null voltage, need zeroing process to be carried out to sensor.
The present invention is returned to zero mode using manual hardware according to practical situation, is completed during the manufacturing of sensor
Zeroing work, needs during zeroing to measure the average resistance of Wheatstone bridge arm resistance, calculates zeroing electricity by formula
The size of resistance, rationally determines zero-regulator resistor sequence, makes zero-regulator resistor R by zero-regulator resistor combined sequence as few as possible out, and
The initial total null voltage of sensor is made to be not more than 1mv.
The step of concrete bridge type magnetic sensor returns to zero be：Sensor is powered using DC source, unit is, unit of resistance
For k Ω.
（1）Before bridge type magnetic sensor makes encapsulation, the initial zero position voltage of accurate measurement sensor, input resistance, defeated
Go out resistance；
（2）Calculate the average resistance size of sensor
（3）Parallel resistance resistance size according to needed for formula is calculated
Available
（4）By, zero-regulator resistor sequence is obtained（kΩ）：
1 1.8 3.2 5.6
10 18 32 56
100 180 320 560
1000
It is 1-5 k Ω that this group resistance sequence is applied to the average resistance of sensor arm resistance, when the average resistance of sensor does not exist
When in the range of this, zero-regulator resistor sequence can be analogized in proportion.
For example, when sensor average resistance be 100-500 Ω when, push away zero-regulator resistor sequence is：
100Ω 180Ω 320Ω 560Ω
1 kΩ 1.8 kΩ 3.2 kΩ 5.6 kΩ
10 kΩ 18 kΩ 32 kΩ 56 kΩ
100 kΩ
Combine from zero-regulator resistor sequence（Serial or parallel connection）Go out the resistance of required resistance, and resistance is non-pressure sensitive, no
Change with sensor input signal and change；
（5）By the resistance combination in one or more zero-regulator resistor sequences（Serial or parallel connection）Current potential higher bridge is connected in parallel on afterwards
Arm, and the packaging and testing of sensor are completed, as shown in Figure 2, wherein R represents the resistance after combination.
In conjunction with bridge-type acceleration transducer example, this method is described further.
Concrete regulation process：
Example 1：During sensor production, input resistance is surveyed, output resistance, initial zero position electricity
Pressure, sensor powered using 3.3V DC source.
By formula
32 are chosen from zero-regulator resistor sequence、18、1.8Resistant series constitute zero-regulator resistor R=51.8 together.
Example 2：During sensor production, input resistance is surveyed, output resistance, initial zero position
Voltage, sensor powered using 3.3V DC source.
By formula
100 are chosen from zero-regulator resistor sequenceResistance directly obtains zero-regulator resistor R=100.
Resistance R after combination is parallel to the higher electric bridge of current potential（Such as figure two）, survey at the beginning of the bridge type magnetic sensor after zeroing
Beginning output voltage is less than 1.Encapsulate by after being fixed to resistance R in parallel, work of returning to zero is completed, then is carried out follow-up
The work such as transducer calibration.
Claims (3)
1. a kind of bridge type magnetic sensor initial zero position voltage adjusting zero method, it is characterised in that：
Step 1, bridge type magnetic sensor make encapsulation before, the Wheatstone bridge initial zero position voltage of accurate measurement sensor, input
Resistance, output resistance：
Wherein、、、For four arm resistances of Wheatstone bridge,For supply voltage,For zero-bit output voltage；
Step 2, the average resistance size of calculating sensor：
The zero-regulator resistor of the higher brachium pontis parallel connection of step 3, calculating current potential：
Step 4, go out the zero-regulator resistor of required resistance from serial or parallel connection zero-regulator resistor sequence；
Step 5, by zero-regulator resistorThe higher brachium pontis of current potential is connected in parallel on, and completes the packaging and testing of sensor.
2. bridge type magnetic sensor initial zero position voltage adjusting zero method according to claim 1, it is characterised in that：Described step
In 3：
Available
.
3. bridge type magnetic sensor initial zero position voltage adjusting zero method according to claim 1, it is characterised in that：Described zeroing
Resistance is non-pressure sensitive, does not change with sensor input signal and changes.
Priority Applications (1)
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|---|---|---|---|
| CN201610831805.XA CN106441403B (en) | 2016-09-19 | 2016-09-19 | Bridge type magnetic sensor initial zero position voltage adjusting zero method |
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| CN201610831805.XA CN106441403B (en) | 2016-09-19 | 2016-09-19 | Bridge type magnetic sensor initial zero position voltage adjusting zero method |
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| CN106441403A true CN106441403A (en) | 2017-02-22 |
| CN106441403B CN106441403B (en) | 2019-03-08 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110006330A (en) * | 2019-04-17 | 2019-07-12 | 中国工程物理研究院化工材料研究所 | A kind of strain testing zero circuit of width Standard resistance range resistance strain sensor |
| CN114964346A (en) * | 2022-04-11 | 2022-08-30 | 合肥通用机械研究院有限公司 | Sensor testing method |
| CN115183918A (en) * | 2022-07-20 | 2022-10-14 | 无锡芯感智半导体有限公司 | Temperature compensation bridge balance structure suitable for MEMS pressure sensor |
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| JP2013022110A (en) * | 2011-07-19 | 2013-02-04 | Mitsubishi Electric Corp | Needle thread tension measurement device of sewing machine |
| CN105181238A (en) * | 2015-06-04 | 2015-12-23 | 苏州科技学院 | Device for adjusting zero point and measuring range of ceramic pressure sensor |
| CN104913829A (en) * | 2015-07-07 | 2015-09-16 | 国网上海市电力公司 | Single crystal silicon piezoresistive type online oil level detector |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110006330A (en) * | 2019-04-17 | 2019-07-12 | 中国工程物理研究院化工材料研究所 | A kind of strain testing zero circuit of width Standard resistance range resistance strain sensor |
| CN114964346A (en) * | 2022-04-11 | 2022-08-30 | 合肥通用机械研究院有限公司 | Sensor testing method |
| CN114964346B (en) * | 2022-04-11 | 2023-08-01 | 合肥通用机械研究院有限公司 | Sensor testing method |
| CN115183918A (en) * | 2022-07-20 | 2022-10-14 | 无锡芯感智半导体有限公司 | Temperature compensation bridge balance structure suitable for MEMS pressure sensor |
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| CN106441403B (en) | 2019-03-08 |
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