CN107680243B - Note thickness measurement device and measurement method based on infrared sensor transmission - Google Patents
Note thickness measurement device and measurement method based on infrared sensor transmission Download PDFInfo
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- CN107680243B CN107680243B CN201710787678.2A CN201710787678A CN107680243B CN 107680243 B CN107680243 B CN 107680243B CN 201710787678 A CN201710787678 A CN 201710787678A CN 107680243 B CN107680243 B CN 107680243B
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- 238000005259 measurement Methods 0.000 title claims abstract description 24
- 230000005540 biological transmission Effects 0.000 title claims abstract description 18
- 238000000691 measurement method Methods 0.000 title claims abstract description 16
- 238000001514 detection method Methods 0.000 claims abstract description 72
- 230000005622 photoelectricity Effects 0.000 claims abstract description 41
- 239000000428 dust Substances 0.000 claims description 31
- 230000000149 penetrating effect Effects 0.000 claims description 6
- 238000010521 absorption reaction Methods 0.000 claims description 4
- 238000009434 installation Methods 0.000 claims description 4
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 230000005611 electricity Effects 0.000 claims description 3
- 230000003749 cleanliness Effects 0.000 claims description 2
- 238000007689 inspection Methods 0.000 claims 1
- 238000000034 method Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
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- 230000001105 regulatory effect Effects 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
Classifications
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- G—PHYSICS
- G07—CHECKING-DEVICES
- G07D—HANDLING OF COINS OR VALUABLE PAPERS, e.g. TESTING, SORTING BY DENOMINATIONS, COUNTING, DISPENSING, CHANGING OR DEPOSITING
- G07D7/00—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency
- G07D7/16—Testing the dimensions
- G07D7/164—Thickness
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- G—PHYSICS
- G07—CHECKING-DEVICES
- G07D—HANDLING OF COINS OR VALUABLE PAPERS, e.g. TESTING, SORTING BY DENOMINATIONS, COUNTING, DISPENSING, CHANGING OR DEPOSITING
- G07D7/00—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency
- G07D7/06—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency using wave or particle radiation
- G07D7/12—Visible light, infrared or ultraviolet radiation
- G07D7/128—Viewing devices
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- General Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Length Measuring Devices By Optical Means (AREA)
- Length-Measuring Devices Using Wave Or Particle Radiation (AREA)
Abstract
The invention discloses a kind of note thickness measurement devices and measurement method based on infrared sensor transmission, including at least 2 groups of infrared transmitting tubes and infrared receiving tube, controller, driving current detection circuit and photoelectricity current detection circuit；Each infrared transmitting tube is electrically connected with the controller, and driving current detection circuit is electrically connected with each infrared transmitting tube and controller respectively, and photoelectricity current detection circuit is electrically connected with each infrared receiving tube and controller respectively.The characteristics of present invention, which has, improves measurement accuracy, and structure is simple and save the cost.
Description
Technical field
The present invention relates to banknote thickness field of measuring technique, can improve measurement accuracy more particularly, to a kind of, structure is simple
With the note thickness measurement device and measurement method based on infrared sensor transmission of save the cost.
Background technique
Currently, financial bank note thickness measuring mainly has three ways, such as current vortex, Hall, ultrasonic wave, current vortex, Hall thickness measuring
Structural member is more demanding, and production, debugging maintenance are more complicated, and ultrasonic wave is easy to be affected with dust.Therefore, a kind of structure letter is designed
Single, production, debugging is convenient and note thickness measurement device and measurement method at low cost just seem very necessary.
Summary of the invention
The present invention is to overcome in the prior art, and traditional bank note measurement thickness schemes structural member requires high, production, debugging
Maintenance is complicated, the low problem of precision, provide it is a kind of can improve measurement accuracy, structure is simple and save the cost based on infrared biography
The note thickness measurement device and measurement method of sensor transmission.
To achieve the above object, the invention adopts the following technical scheme:
A kind of note thickness measurement device based on infrared sensor transmission, including at least 2 groups of infrared transmitting tubes and infrared
Reception pipe, controller, driving current detection circuit and photoelectricity current detection circuit；Each infrared transmitting tube is electrically connected with controller
It connects, driving current detection circuit is electrically connected with each infrared transmitting tube and controller respectively, and photoelectricity current detection circuit is respectively and respectively
A infrared receiving tube and controller electrical connection.
It after the infrared penetration bank note that the present invention is issued by infrared transmitting tube, is irradiated on infrared receiving tube, detects red
The variable quantity of outer reception pipe output voltage, and then detect the thickness of bank note.The present invention have improve measurement accuracy, structure simply and
The characteristics of save the cost.
Preferably, the invention also includes drive current adjustment circuit, the input terminal of drive current adjustment circuit and control
Device electrical connection, the output end of drive current adjustment circuit are electrically connected with each infrared transmitting tube, also equal in each infrared transmitting tube
Equipped with dust sensor, each dust sensor is electrically connected with the controller.
Preferably, the invention also includes switching circuit and NTC thermistor, the one of switching circuit and NTC thermistor
End be electrically connected with photoelectricity current detection circuit, the other end of switching circuit and NTC thermistor respectively with each infrared receiver
Pipe electrical connection, switching circuit and NTC thermistor are in parallel, are equipped with temperature in each infrared transmitting tube and each infrared receiving tube
Sensor, each temperature sensor are electrically connected with the controller.
Preferably, being equipped with dust guard outside each infrared transmitting tube and each infrared receiving tube.Infrared sensor
The methods of it being easy to be influenced by dust, installation will have dust prevention, such as have the box for receiving dust or dust suppression,
Reducing dust to greatest extent influences.
Preferably, each pair of infrared transmitting tube and infrared receiving tube be in installation site, equal horizontal position is and each right to just
The centre distance of infrared transmitting tube and infrared receiving tube is no more than 5mm.The mounting means is conducive to improve the precision of measurement.
A kind of measurement method of the note thickness measurement device based on infrared sensor transmission, includes the following steps:
The acquisition of (6-1) data
(6-1-1) under the control of the controller, the infrared ray that each infrared transmitting tube issues is irradiated to after penetrating bank note
On each corresponding infrared receiving tube, at this time driving current detection circuit within the period that former and later two length are L every
Time T1 detects the driving current data of 1 each infrared transmitting tube；Wherein, former and later two periods be respectively period A and
Period B, L=n × T1, then controller obtains each n detection of the driving current detection circuit in period A and period B
Value；
Each infrared receiving tube is after receiving and penetrating the infrared ray of bank note, and photoelectricity current detection circuit is equally in front and back at this time
Two length are to detect the photoelectricity flow data of 1 each infrared receiving tube every time T1 in the period of L；Wherein, front and back
Two periods are respectively period A and period B, and L=n × T1, then controller obtains photoelectricity current detection circuit in period A
With each n detected value in period B；
(6-1-2) calculates driving current detection circuit and photoelectricity current detection circuit in period A and period B and obtains respectively
Detected value similarity；
(6-1-3) controller judges the similarity for the detected value that driving current detection circuit and photoelectricity current detection circuit obtain
Size then saves driving current detection circuit and photoelectricity current detection circuit exists when the similarity of detected value is all larger than equal to 0.9
Each n detected value in period A and period B, in case subsequent calls；Similarity at least 1 when detected value is less than
When 0.9, then controller control obtains corresponding circuits of the similarity less than 0.9 of detected value, is repeated in step (6-1-1), step
Suddenly (6-1-2) and step (6-1-3), until the similarity size of the detected value obtained, is more than or equal to 0.9；
The conversion of (6-2) data
The linear relationship of transmitting light intensity and driving current in controller equipped with infrared transmitting tube, controller is according to acquisition
Driving current data, convert and obtain each infrared transmitting tube and emit light intensity data accordingly；
It is additionally provided with the photoelectric current of infrared receiving tube in controller and receives the linear relationship of light intensity, controller is according to acquisition
Photoelectricity flow data converts and obtains each infrared receiving tube receiving light intensity data accordingly；
The calculating of (6-3) data
It is calculated accordingly using formula controller, and obtains each group infrared transmitting tube and infrared connect
The data of banknote thickness measured by closed tube, wherein I is to receive light intensity, I0To emit light intensity, α is absorption coefficient, and x is bank note
Thickness.
Preferably, step (6-1) further includes following steps:
(6-1-4) when dust sensor detects on infrared transmitting tube or speckles with dust on infrared receiving tube, controller
The work of drive current adjustment circuit is controlled, increases the driving current of infrared transmitting tube, to increase the transmitting of infrared transmitting tube
Light intensity, and then the photoelectric current of infrared receiving tube is remained unchanged, to keep reception light intensity constant.
When speckling with dust on infrared transmitting tube, light intensity Δ I1 can be lost in transmitting tube dust, similarly grey in reception pipe
Light intensity Δ I2 can be also lost in dirt, and theoretically, when reception pipe will generate identical photoelectric current i2, transmitting tube, which will issue light intensity, to be overcome
The light intensity that dust is lost on infrared transmitting tube, there are also the light intensity that bank note absorbs, and transmitting tube light intensity is on the basis of I1, Yao Zengjia (Δ
I1+ Δ I2) light intensity.I.e. when having dust on infrared transmitting tube and reception pipe, the output signal of reception pipe to be kept to change
Simultaneously with no dust phase, for the light intensity of transmitting tube in no dust on the basis of light intensity, Yao Zengjia overcomes the light intensity of dust
(Δ I1+ Δ I2), therefore the driving current of transmitting tube will increase Δ i1, the driving current curve for being equivalent to transmitting tube is subjected to displacement.
Preferably, each detected value of set period of time A is xi, each detected value of period B is yi, i=1,
2 ..., n；
The detected value of two period driving current detection circuits and the acquisition of photoelectricity current detection circuit is calculated using formula
Similarity, whereinFor being averaged for electric drive current detection circuit in period A or all detected values of photoelectricity current detection circuit
Value,It is the average value of electric drive current detection circuit or all detected values of photoelectricity current detection circuit in period B.
Preferably, step (6-1) further includes following steps:
(6-1-5) function of temperature compensation control
When the temperature sensor in infrared transmitting tube detects that environment temperature increases, controller controls drive current adjustment
Circuit work, increases the driving current of infrared transmitting tube, to increase the transmitting light intensity of infrared transmitting tube；
When the temperature sensor in infrared receiving tube detects that environment temperature increases, controller control switch circuit is cut
Only, NTC thermistor enters working condition, and as temperature increases, the resistance of NTC thermistor is reduced, and keeps infrared receiving tube
Photoelectric current linear preservers it is constant.
Therefore, the invention has the following beneficial effects: (1) to realize automatic compensation infrared tube infrared radiation densities, correction
Infrared receiving tube photoelectricity cleanliness, overcome dust, banknote thickness to be unevenly distributed, bank note local absorption infrared ray is inconsistent and
The influence of ambient temperature variation, to realize the measurement of banknote thickness；(2) structure is simple, save the cost.
Detailed description of the invention
Fig. 1 is a kind of apparatus structure schematic diagram of the invention；
Fig. 2 is a kind of functional block diagram of the invention；
Fig. 3 is a kind of flow chart of the invention.
In figure: infrared transmitting tube 1, infrared receiving tube 2, controller 3, driving current detection circuit 4, photoelectricity current detection circuit
5, drive current adjustment circuit 6, switching circuit 7, NTC thermistor 8.
Specific embodiment
The present invention will be further described with specific embodiment with reference to the accompanying drawing:
A kind of note thickness measurement device based on infrared sensor transmission as depicted in figs. 1 and 2, including it is 3 pairs infrared
Transmitting tube 1 and infrared receiving tube 2, controller 3, driving current detection circuit 4 and photoelectricity current detection circuit 5；Each infrared emission
Guan Jun is electrically connected with the controller, and driving current detection circuit is electrically connected with each infrared transmitting tube and controller respectively, photoelectric current
Detection circuit is electrically connected with each infrared receiving tube and controller respectively.The invention also includes drive current adjustment circuit 6, drivings
The input terminal of current regulating circuit is electrically connected with the controller, the output end of drive current adjustment circuit and each infrared transmitting tube electricity
Connection, is also equipped with dust sensor in each infrared transmitting tube and each infrared receiving tube, each dust sensor with control
Device electrical connection processed.
In addition, the invention also includes switching circuit 7 and NTC thermistor 8, one end of switching circuit and NTC thermistor
Be electrically connected with photoelectricity current detection circuit, the other end of switching circuit and NTC thermistor respectively with each infrared receiving tube
Electrical connection, switching circuit and NTC thermistor are in parallel, and temperature biography is equipped in each infrared transmitting tube and each infrared receiving tube
Sensor, each temperature sensor are electrically connected with the controller.It is equipped with outside each infrared transmitting tube and each infrared receiving tube
Dust guard.In installation site, equal horizontal position is to just, and each pair of infrared emission for each pair of infrared transmitting tube and infrared receiving tube
The centre distance of pipe and infrared receiving tube is 5mm.
A kind of banknote thickness measurement method based on infrared sensor transmission as shown in Figure 3, includes the following steps:
Step 100, the acquisition of data
Step 110, under the control of the controller, the infrared ray that each infrared transmitting tube issues is after penetrating bank note, irradiation
Onto each corresponding infrared receiving tube, driving current detection circuit is 1 minute period in former and later two length at this time
The interior driving current data every the 1 each infrared transmitting tube of detection in the time 1 second；Wherein, when former and later two periods are respectively
Between section A and period B, then controller obtain driving current detection circuit in period A and period B it is each 60 detection
Value；
Each infrared receiving tube is after receiving and penetrating the infrared ray of bank note, and driving current detection circuit is equally preceding at this time
Latter two length is 1 minute period interior photoelectricity flow data every the 1 each infrared transmitting tube of detection in the time 1 minute；
Wherein, former and later two periods are respectively period A and period B, then controller obtains photoelectricity current detection circuit in period A
With each 60 detected values in period B；
Step 120, each detected value of set period of time A is xi, each detected value of period B is yi, i=1,
2 ..., n；
The detected value of two period driving current detection circuits and the acquisition of photoelectricity current detection circuit is calculated using formula
Similarity, whereinFor being averaged for electric drive current detection circuit in period A or all detected values of photoelectricity current detection circuit
Value,It is the average value of electric drive current detection circuit or all detected values of photoelectricity current detection circuit in period B.
Step 130, controller judges the similar of the detected value that driving current detection circuit and photoelectricity current detection circuit obtain
Degree size then saves driving current detection circuit and photoelectricity current detection circuit when the similarity of detected value is all larger than equal to 0.9
Each n detected value in period A and period B, in case subsequent calls；Similarity at least 1 when detected value is less than
When 0.9, then controller control obtains corresponding circuits of the similarity less than 0.9 of detected value, is repeated in step 110, step 120
It is more than or equal to 0.9 up to the similarity size of the detected value obtained with step 130.
Step 140, when dust sensor detects on infrared transmitting tube or speckles with dust on infrared receiving tube, controller
The work of drive current adjustment circuit is controlled, so that the driving current of infrared transmitting tube is increased Δ i1, makes the photoelectric current of infrared receiving tube
It remains unchanged, to keep reception light intensity constant；
Step 150, function of temperature compensation control
When the temperature sensor in infrared transmitting tube detects that environment temperature increases, controller controls drive current adjustment
Circuit work, increases the driving current of infrared transmitting tube, to increase the transmitting light intensity of infrared transmitting tube；
When the temperature sensor in infrared receiving tube detects that environment temperature increases, controller control switch circuit is cut
Only, NTC thermistor enters working condition, and as temperature increases, the resistance of NTC thermistor is reduced, and keeps infrared receiving tube
Photoelectric current linear preservers it is constant；
In addition, the raising of temperature can also have an impact the dark current of infrared receiving tube, the influence to dark current is equivalent to
It has been superimposed a DC component, can have been removed by difference operation or differential amplification.
Step 200, the conversion of data
The linear relationship of transmitting light intensity and driving current in controller equipped with infrared transmitting tube, controller is according to acquisition
Driving current data, convert and obtain each infrared transmitting tube and emit light intensity data accordingly；
It is additionally provided with the photoelectric current of infrared receiving tube in controller and receives the linear relationship of light intensity, controller is according to acquisition
Photoelectricity flow data converts and obtains each infrared receiving tube receiving light intensity data accordingly.
Step 300, the calculating of data
It is calculated accordingly using formula controller, and obtains each group infrared transmitting tube and infrared connect
The data of banknote thickness measured by closed tube, wherein I is to receive light intensity, I0To emit light intensity, α is absorption coefficient, and x is bank note
Thickness.
It should be understood that this embodiment is only used to illustrate the invention but not to limit the scope of the invention.In addition, it should also be understood that, In
After having read the content of the invention lectured, those skilled in the art can make various modifications or changes to the present invention, these etc.
Valence form is also fallen within the scope of the appended claims of the present application.
Claims (8)
1. a kind of measurement method of the note thickness measurement device based on infrared sensor transmission, the bank note of infrared sensor transmission
Measurer for thickness includes that at least 2 groups of infrared transmitting tubes (1) and infrared receiving tube (2), controller (3), driving current detection are electric
Road (4) and photoelectricity current detection circuit (5)；Each infrared transmitting tube is electrically connected with the controller, driving current detection circuit difference
It is electrically connected with each infrared transmitting tube and controller, photoelectricity current detection circuit is electrically connected with each infrared receiving tube and controller respectively
It connects；It is characterized in that including the following steps:
1-1, the acquisition of data
1-1-1, under the control of the controller, the infrared ray that each infrared transmitting tube issues are irradiated to each after penetrating bank note
On corresponding infrared receiving tube, driving current detection circuit is within the period that former and later two length are L every the time at this time
T1 detects the driving current data of 1 each infrared transmitting tube；Wherein, former and later two periods are respectively period A and time
Section B, L=n × T1, then controller obtains each n detected value of the driving current detection circuit in period A and period B；
Each infrared receiving tube is after receiving and penetrating the infrared ray of bank note, and photoelectricity current detection circuit is equally at former and later two at this time
Length is to detect the photoelectricity flow data of 1 each infrared receiving tube every time T1 in the period of L；Wherein, former and later two
Period is respectively period A and period B, L=n × T1, then controller obtain photoelectricity current detection circuit period A and when
Between each n detected value in section B；
1-1-2 calculates the inspection that driving current detection circuit and photoelectricity current detection circuit obtain respectively in period A and period B
The similarity of measured value；
1-1-3, controller judge the similarity size for the detected value that driving current detection circuit and photoelectricity current detection circuit obtain,
When the similarity of detected value is all larger than equal to 0.9, then driving current detection circuit and photoelectricity current detection circuit are saved in the time
Each n detected value in section A and period B, in case subsequent calls；When the similarity of detected value at least 1 less than 0.9,
Then controller control obtain detected value corresponding circuits of the similarity less than 0.9, be repeated in step 1-1-1, step 1-1-2 and
Step 1-1-3, until the similarity size of the detected value obtained, is more than or equal to 0.9；
1-2, the conversion of data
The linear relationship of transmitting light intensity and driving current in controller equipped with infrared transmitting tube, controller is according to the driving of acquisition
Current data, converts and obtains each infrared transmitting tube and emit light intensity data accordingly；
It is additionally provided with the photoelectric current of infrared receiving tube in controller and receives the linear relationship of light intensity, controller is according to the photoelectricity of acquisition
Flow data converts and obtains each infrared receiving tube receiving light intensity data accordingly；
1-3, the calculating of data
It is calculated accordingly using formula controller, and obtains each group infrared transmitting tube and infrared receiving tube institute
The data of the banknote thickness measured, wherein I is to receive light intensity, I0To emit light intensity, α is absorption coefficient, and x is the thickness of bank note.
2. the measurement method of the note thickness measurement device according to claim 1 based on infrared sensor transmission, special
Sign be further include drive current adjustment circuit (6), the input terminal of drive current adjustment circuit is electrically connected with the controller, driving electricity
The output end that stream adjusts circuit is electrically connected with each infrared transmitting tube, also equal in each infrared transmitting tube and each infrared receiving tube
Equipped with dust sensor, each dust sensor is electrically connected with the controller.
3. the measurement method of the note thickness measurement device according to claim 1 based on infrared sensor transmission, special
Sign be further include switching circuit (7) and NTC thermistor (8), one end of switching circuit and NTC thermistor is and photoelectric current
The other end of detection circuit electrical connection, switching circuit and NTC thermistor is electrically connected with each infrared receiving tube respectively, is switched
Circuit and NTC thermistor are in parallel, are equipped with temperature sensor, Ge Gewen in each infrared transmitting tube and each infrared receiving tube
Degree sensor is electrically connected with the controller.
4. the measurement method of the note thickness measurement device according to claim 1 based on infrared sensor transmission, special
Sign is to be equipped with dust guard outside each infrared transmitting tube and each infrared receiving tube.
5. the measurement method of the note thickness measurement device according to claim 1 based on infrared sensor transmission, special
Sign is, each group infrared transmitting tube and infrared receiving tube in installation site, equal horizontal position to just, and each group infrared transmitting tube and
The centre distance of infrared receiving tube is no more than 5mm.
6. the measurement method of the note thickness measurement device according to claim 1 based on infrared sensor transmission, is also wrapped
Drive current adjustment circuit is included, the input terminal of drive current adjustment circuit is electrically connected with the controller, drive current adjustment circuit
Output end is electrically connected with each infrared transmitting tube, and dust sensing is also equipped in each infrared transmitting tube and each infrared receiving tube
Device, each dust sensor are electrically connected with the controller；It is characterized in that step 1-1 includes the following steps:
1-1-4, when dust sensor detects on infrared transmitting tube or speckles with dust on infrared receiving tube, controller control is driven
Streaming current adjusts circuit work, increases the driving current of infrared transmitting tube, thus increase the transmitting light intensity of infrared transmitting tube, into
And the photoelectric current of infrared receiving tube is remained unchanged, to keep reception light intensity constant.
7. the measurement method of the note thickness measurement device according to claim 1 based on infrared sensor transmission, special
Sign is that step 1-1-2 further includes following steps:
Each detected value of set period of time A is xi, each detected value of period B is yi, i=1,2 ..., n；
The similar of the detected value of two period driving current detection circuits and the acquisition of photoelectricity current detection circuit is calculated using formula
Degree, whereinFor electric drive current detection circuit in period A or the average value of all detected values of photoelectricity current detection circuit,It is
The average value of electric drive current detection circuit or all detected values of photoelectricity current detection circuit in period B.
8. the measurement method of the note thickness measurement device according to claim 1 based on infrared sensor transmission, is also wrapped
Including switching circuit and NTC thermistor, one end of switching circuit and NTC thermistor is electrically connected with photoelectricity current detection circuit,
Switching circuit and the other end of NTC thermistor are electrically connected with each infrared receiving tube respectively, switching circuit and NTC temperature-sensitive electricity
Resistance is in parallel, is equipped with temperature sensor in each infrared transmitting tube and each infrared receiving tube, each temperature sensor with control
Device electrical connection processed；It is characterized in that step 1-1 further includes following steps:
1-1-5, function of temperature compensation control
When the temperature sensor in infrared transmitting tube detects that environment temperature increases, controller controls drive current adjustment circuit
Work, increases the driving current of infrared transmitting tube, to increase the transmitting light intensity of infrared transmitting tube；
When the temperature sensor in infrared receiving tube detects that environment temperature increases, the cut-off of controller control switch circuit, NTC
Thermistor enters working condition, and as temperature increases, the resistance of NTC thermistor is reduced, and keeps the photoelectricity of infrared receiving tube
Cleanliness remains unchanged.
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| CN201710787678.2A CN107680243B (en) | 2017-09-04 | 2017-09-04 | Note thickness measurement device and measurement method based on infrared sensor transmission |
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| CN201710787678.2A CN107680243B (en) | 2017-09-04 | 2017-09-04 | Note thickness measurement device and measurement method based on infrared sensor transmission |
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| JP2006285775A (en) * | 2005-04-01 | 2006-10-19 | Shinko Electric Co Ltd | Paper sheet discrimination device |
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