CN207180596U - A kind of PSD sensor signal conditionings device - Google Patents
A kind of PSD sensor signal conditionings device Download PDFInfo
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- CN207180596U CN207180596U CN201720652256.XU CN201720652256U CN207180596U CN 207180596 U CN207180596 U CN 207180596U CN 201720652256 U CN201720652256 U CN 201720652256U CN 207180596 U CN207180596 U CN 207180596U
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Abstract
It the utility model is related to a kind of PSD sensor signal conditionings device, including PSD sensor assemblies, pre-amplification circuit, analog operational circuit, analog to digital conversion circuit, data operation processing module, display module, serial communication modular, PSD sensor assemblies, pre-amplification circuit, analog operational circuit, analog to digital conversion circuit, data operation processing module pass sequentially through control circuit and are connected in series, and the output port of data operation processing module installs serial communication modular and display module respectively.The electric signal that the utility model obtains from PSD electrodes can not directly carry out location presentation.This patent is with reference to amplifying circuit, analog operational circuit, analog to digital conversion circuit to PSD signal processing method, first signal is amplified, then the calculation process of addition, subtraction and division is carried out to electric signal, improve the precision of measurement signal, so that show that the relation of facula position and magnitude of voltage is more accurate, then analog position signal is converted into data signal, is easy to computer disposal.
Description
Technical field
The utility model belongs to signal processing technology field, is related to sensor technology, especially a kind of PSD sensor signals
Conditioning device.
Background technology
Position sensitive detector PSD (Position Sensitive Device) be one kind can tracking radiation to its table
The sensor of the light-beam position in face, its basic structure include high-ohmic substrate and are covered in one layer or two layers of substrate surface
Resistive layer (being divided into one-dimensional or Two-dimensional PSD)
PSD sensor mechanism is very simple：If the P layers at top by a branch of light irradiation, have corresponding electric charge and produced, electric charge
For size with the proportional relation of intensity of light, the potential formed in resistive layer will cause hot spot and the resistive layer both ends two on PSD surfaces
The flowing of photoelectric current between individual electrode, hot spot can be obtained to the distance of PSD centers after carrying out computing according to electric current.But from
The electric signal that PSD electrodes obtain can not directly carry out location presentation, caused signal need by analog signal conditioner part and
Partly processing could use for data signal conditioning, and wherein analog portion completes the signal synchronization amplification of multichannel, gathers, be anti-aliasing
Filtering etc..Therefore analog signal conditioner circuit has the function that important in data collecting system.
The stability of light source light intensity itself and the drift of beam direction in PSD measurement process, the dc shift of amplifier and
The measurement that directly affects of the portion such as dark current and positioning precision, particularly when measurement data is more, when measurement period is long, influence more
Significantly.
Individually PSD process circuits commercialization, and also single-chip microcomputer application specific integrated circuit at present.Circuit mainly wraps
The parts such as preposition amplification, adder, subtracter, divider are included, but its measurement accuracy in actually measuring is not high, it is necessary to carry out non-
Linear compensation.But nonlinear compensation is realized using hardware circuit, preferably influenceed by factors such as dc shifts, measured value floats
It is larger, influence the raising of measurement accuracy.
Utility model content
The purpose of this utility model is in place of overcome the deficiencies in the prior art, there is provided one kind is reasonable in design, cost is cheap
PSD sensor signal conditioning devices.
The utility model solves its technical problem and takes following technical scheme to realize：
A kind of PSD sensor signal conditionings device, including PSD sensor assemblies, pre-amplification circuit, simulation trial electricity
Road, analog to digital conversion circuit, data operation processing module, display module, serial communication modular, PSD sensor assemblies, preposition amplification
Circuit, analog operational circuit, analog to digital conversion circuit, data operation processing module pass sequentially through control circuit and are connected in series, data
The output port of calculation process module installs serial communication modular and display module respectively.
Moreover, also including power module, for calculation process module for power supply, the power module turns 12V circuits including 24V
Turn 3.3V circuits with 24V, wherein 24V turns 12V circuit chips as step-down switching type integrated voltage-stabilized chip LM2596-5, and 24V turns
3.3V circuit chips are AMS1117-3.3.
Moreover, the PSD sensor assemblies are segmentation PSD sensors.
Moreover, the pre-amplifying module is OPA37FZ amplifiers.
Moreover, the data operation processing module is STM32 single-chip microcomputers.
Moreover, the simulation trial module is voltage-current converter circuit.
Moreover, the digital signal processing module is AD7327 chips.
Moreover, the display module is TFTLED display modules.
The advantages of the utility model and good effect are：
The utility model is according to the PSD method of operation it is recognised that the electric signal obtained from PSD electrodes can not be carried out directly
Location presentation.This patent is to combine amplifying circuit, analog operational circuit, analog to digital conversion circuit to PSD signal processing method, first right
Signal is amplified, and the calculation process of addition, subtraction and division is then carried out to electric signal, the precision of measurement signal is improved, makes
It must show that the relation of facula position and magnitude of voltage is more accurate, analog position signal is then converted into data signal, be easy to count
The processing of calculation machine.
Brief description of the drawings
Fig. 1 is schematic block circuit diagram of the present utility model；
Fig. 2 is workflow diagram of the present utility model；
Fig. 3 is the PSD component schematics that the utility model uses；
Fig. 4 is the PSD signal amplification circuit diagram that the utility model uses；
Fig. 5 is the PSD signal addition and subtraction circuit figure that the utility model uses；
Fig. 6 is the PSD signal division arithmetic circuit diagram that the utility model uses.
Embodiment
Below in conjunction with the accompanying drawings and the utility model is described in further detail by specific embodiment, and following examples are simply retouched
The property stated, be not limited, it is impossible to limit the scope of protection of the utility model with this.
A kind of PSD sensor signal conditionings device, see Fig. 1, including PSD sensor assemblies, pre-amplification circuit, simulation fortune
Circuit, analog to digital conversion circuit, data operation processing module, display module, serial communication modular are calculated, it is PSD sensor assemblies, preposition
Amplifying circuit, analog operational circuit, analog to digital conversion circuit, data operation processing module pass sequentially through control circuit and are connected in series,
The output port of data operation processing module installs serial communication modular and display module respectively.
Its workflow such as Fig. 2.
The power module of single-chip microcomputer turns 12V circuits including 24V and 24V turns 3.3V circuits.Wherein 24V turns 12V circuit chips
For step-down switching type integrated voltage-stabilized chip LM2596-5, it is AMS1117-3.3 that 24V, which turns 3.3V circuit chips,.
Data operation processing module is STM32 single-chip microcomputers and its minimum system circuit, and the STM32 single-chip microcomputers have high accuracy
DA output functions.
Digital signal processing module is AD7327 chips, and AD7327 is special with 8 passages, the input of true bipolarity, 12 bit resolutions
Property high precision analogue conversion chip, and can to positive/negative voltage signal carry out calculation process.
Display module is TFTLED display modules, for display location information.
Operation principle of the present utility model is：
In position measurement, PSD each electrode can produce 0-100uA weak current, and these current signals need to be changed into
Magnitude of voltage can carry out the processing computing of signal data, simultaneously as current signal is too small, so needing to current signal
Enhanced processing is done, is then performed mathematical calculations.Due to PSD sensors output be less susceptible to processing current signal, so
PSD sensor front end circuits first have to be converted into voltage signal.Because the current signal of PSD devices output is more faint, and this
Body has higher output impedance, should be tried one's best so higher to the performance requirement of amplifier, during type selecting select low imbalance, low drifting,
High accuracy, the operational amplifier of Low-bias Current, and the bandwidth requirement of modulated light source should be met.
By current-voltage conversion circuit, input current I can be converted to input voltage V0, mathematics between the two be present
Relational expression V0=-I × RF, wherein RFIt is the feedback resistance in circuit.In addition, the multiplication factor A of amplifying circuitout, by feedback electricity
The resistance R of resistanceFResistance value R with being connected base stage0Ratio determine.By translation operation, can obtain magnitude of voltage is：
Formula shows, output voltage VoutDirectly proportional to input current I, proportionality coefficient is determined by each resistance in change-over circuit
It is fixed, therefore different resistance values is chosen based on suitable current amplification factor, if the magnification ratio chosen is 1：10000, then
The voltage that maximum is 5V can be obtained.
As shown in figure 3, the schematic diagram of signal is produced for PSD elements.
PSD sensor assemblies are segmentation PSD sensors, and the PSD sensors have extraordinary stability, response speed
It is fast and be suitably applied centering for zero and light.
PSD elements produce current signal I-A, I-B, I-C and I-D.
The circuit that is amplified to PSD signal as shown in figure 4, operational amplifier using OPA37FZ amplifiers, this is put
A variety of advantages such as the big utensil amount of offsetting is small, be quick on the draw, precision is high, noise is low, more accurately measurement data can be obtained.
Electric capacity C1, C9, C15, C27 are used for high frequency noise reduction in figure.
The position coordinates of hot spot on PSD elements is obtained, it is necessary to be performed mathematical calculations to PSD output signal, these fortune
Calculation process is completed by analog operational circuit, and the mathematical operation part of analog operational circuit is as illustrated in Figures 5 and 6.
The two paths of signals of hot spot coordinate (X, Y) can be expressed as：
Fig. 5 is PSD signal addition and subtraction circuit figure, above molecular moiety in two formulas respectively by the U3 in Fig. 5 and U7 two
Individual amplifier carries out plus and minus calculation, and the denominator part of two formulas is identical, is carried out by another amplifier U12 in Fig. 5 same
It is added and obtains.
The division arithmetic part of analog operational circuit is as shown in fig. 6, signal after amplifier U3, U7, U12 computing
SING3, SING2, SING1 pass to two dividers of U4, U8.
Because the voltage of output has positive signal and negative signal, so we need to use external high-precision A/D in addition
Modular converter.AD7327 is with 8 passages, the input of true bipolarity, the high precision analogue conversion chip of 12 bit resolution characteristics, string
Port transmission rate is up to speed and the required precision that 500KBPS meets measurement.
The road signal of A, B, C, D of output etc. 4 is, it is necessary to take 4 passages of A/D chips, chip operation is in a single ended mode
It can meet that the order of 4 kinds of signal A/D sampled values is read.The data transfer and Interface Controller of A/D conversion chips are using serial
What SPI interface was realized, control AD7327 conversion and digital signal reception to work using the SPI interface of Mega128 chips.
Single-chip microcomputer control A/D conversions, read each road transformation result, and select the transformation result of preferable times magnification.PC with
Single-chip microcomputer carries out real-time Communication for Power by serial ports, and PC shows measurement result after coordinate can be calculated by host computer and sends control
Signal.Or the data of sampling are directly resolved with STM32, calculation process module is using STM32 single-chip microcomputers as microcontroller, master
Control chip is F104RCT6, and the chip can work in -40~105 DEG C of temperature range, inside save as 256KB, after data acquisition, first
By data deposit stm32 buffer area, X, Y value then can be drawn after calculation process.TFTLED display modules are internally integrated
Large scale integrated circuit LCD drives, and 8 parallel-by-bit modes is used when being attached with STM32, the coordinate value resolved passes through
LCD is directly displayed.
Although disclosing embodiment of the present utility model and accompanying drawing for the purpose of illustration, those skilled in the art can be with
Understand：Do not departing from the utility model and spirit and scope of the appended claims, it is various replace, change and modifications all be can
Can, therefore, the scope of the utility model is not limited to embodiment and accompanying drawing disclosure of that.
Claims (7)
- A kind of 1. PSD sensor signal conditionings device, it is characterised in that：Including PSD sensor assemblies, pre-amplification circuit, mould Plan computing circuit, analog to digital conversion circuit, data operation processing module, display module, serial communication modular, PSD sensor assemblies, Pre-amplification circuit, analog operational circuit, analog to digital conversion circuit, data operation processing module pass sequentially through control circuit series connection and connected Connect, the output port of data operation processing module installs serial communication modular and display module respectively.
- 2. PSD sensor signal conditionings device according to claim 1, it is characterised in that：Also include power module, be used for Calculation process module for power supply, the power module turns 12V circuits including 24V and 24V turns 3.3V circuits, and wherein 24V turns 12V circuits Chip is step-down switching type integrated voltage-stabilized chip LM2596-5, and it is AMS1117-3.3 that 24V, which turns 3.3V circuit chips,.
- 3. PSD sensor signal conditionings device according to claim 1, it is characterised in that：The PSD sensor assemblies are It is segmented PSD sensors.
- 4. PSD sensor signal conditionings device according to claim 1, it is characterised in that：The pre-amplifying module is OPA37FZ amplifiers.
- 5. PSD sensor signal conditionings device according to claim 1, it is characterised in that：The data operation handles mould Block is STM32 single-chip microcomputers.
- 6. PSD sensor signal conditionings device according to claim 1, it is characterised in that：The simulation trial module is Voltage-current converter circuit.
- 7. PSD sensor signal conditionings device according to claim 1, it is characterised in that：The display module is TFTLED display modules.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201720652256.XU CN207180596U (en) | 2017-06-07 | 2017-06-07 | A kind of PSD sensor signal conditionings device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201720652256.XU CN207180596U (en) | 2017-06-07 | 2017-06-07 | A kind of PSD sensor signal conditionings device |
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| CN207180596U true CN207180596U (en) | 2018-04-03 |
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| CN201720652256.XU Expired - Fee Related CN207180596U (en) | 2017-06-07 | 2017-06-07 | A kind of PSD sensor signal conditionings device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109117028A (en) * | 2018-08-27 | 2019-01-01 | 四川仪岛科技有限公司 | A kind of electronic writing method for detecting position and device |
| CN110095091A (en) * | 2019-05-13 | 2019-08-06 | 哈尔滨理工大学 | A kind of Small angle measuring instrument and its measurement method |
| CN110456712A (en) * | 2019-08-22 | 2019-11-15 | 广东职业技术学院 | A kind of control system and its control method of laser coaxial degree measuring instrument |
-
2017
- 2017-06-07 CN CN201720652256.XU patent/CN207180596U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109117028A (en) * | 2018-08-27 | 2019-01-01 | 四川仪岛科技有限公司 | A kind of electronic writing method for detecting position and device |
| CN110095091A (en) * | 2019-05-13 | 2019-08-06 | 哈尔滨理工大学 | A kind of Small angle measuring instrument and its measurement method |
| CN110456712A (en) * | 2019-08-22 | 2019-11-15 | 广东职业技术学院 | A kind of control system and its control method of laser coaxial degree measuring instrument |
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