CN2591601Y - Photoelectric vibrating string type force-measuring sensor - Google Patents
Photoelectric vibrating string type force-measuring sensor Download PDFInfo
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- CN2591601Y CN2591601Y CN 02292896 CN02292896U CN2591601Y CN 2591601 Y CN2591601 Y CN 2591601Y CN 02292896 CN02292896 CN 02292896 CN 02292896 U CN02292896 U CN 02292896U CN 2591601 Y CN2591601 Y CN 2591601Y
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- metal string
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Abstract
The utility model relates to a novel photoelectric vibrating string type force-measuring sensor, which comprises a tension metal string which is fixed on a deformable body. One end of the metal string is connected with ground, the other end is connected with a pulse current source, and both sides of the metal string are provided with magnetic fields. The utility model is characterized in that both the sides of the metal string are respectively provided with a laser and a photoelectric position-sensitive device, the tension of the metal string is changed through the deformable body by the applied force, and the metal string in the magnetic fields generates free vibration through pulse current. A laser irradiates the metal string, the photosensitive surface of the photoelectric position-sensitive device generates the vibrating shadow of the metal string, and the output photoelectric current is converted to the frequency of photoelectric voltage through a signal processing circuit which comprises an I/V converting circuit and a frequency meter. The frequency of the photoelectric voltage is measured, and the loading force information that the tension relative to the frequency of a vibrating string is obtained. The utility model has the advantages that the sensor can avoid the noise which is provided by an electromagnetic induction method, wherein, the electromagnetic induction method is easily disturbed by the strong electromagnetism on site, and the utility model obtains the stable vibrating string frequency signals, enlarges the measuring range, and enhances the load detection capability.
Description
Technical field:
The utility model relates to the device that adopts semiconductor laser and photopotential sensing device ergometry in vibrating string type sensor.
Background technology:
The 31st page of " operating technique " magazine 1997 12 phase point out, string-vibrating force-measuring sensor is that the corresponding relation between stressed carries out the sensor of force measurement to a kind of natural frequency of utilizing vibratory string commonly used with vibratory string.Its structure is generally a tinsel that is commonly referred to the tensioning of vibratory string as resonant element is installed on arc deformable body.Under electric magnetization, vibratory string is by its natural frequency vibration; By changing the tensile force T of vibratory string, can obtain different vibration frequency f, promptly be funtcional relationship between tensile force and the resonance frequency.Therefore, can obtain the stressing conditions of sensor by the vibration frequency that electromagnetic induction is measured vibratory string, thereby finally reach the purpose of dynamometry.
In order to make the vibratory string force cell obtain higher degree of accuracy, must measure accurately the vibration frequency of vibratory string.Because be funtcional relationship between the vibration frequency of the tensile force of vibratory string and vibratory string, so very important to the precision that improves sensor to the measurement of vibratory string frequency.The method of existing survey frequency mainly adopts electromagnetic method, by vibratory string cutting magnetic line in magnetic field, measures induction current, obtains the frequency of vibratory string.This method is subjected to the interference of external electromagnetic field, less stable easily because inductive load such as coil is arranged.So far do not see the report of the device that utilizes photopotential sensing device (PSD) principle ergometry.
Technology contents:
The utility model provides a kind of precision higher and be not subjected to the device of the photoelectricity vibratory string ergometry of employing semiconductor laser that the external environment factor disturbs and photopotential sensing device.
The device of this photoelectricity vibratory string ergometry, comprise can holding capacity deformable body (1); Two ends are strained and fixed at the metallic cord (4) at deformable body (1) middle part; Metallic cord one end ground connection, one terminates on the pulse current source (5); Be fixed on the magnetic field (3) of metallic cord both sides; It is characterized in that metallic cord one side be provided with laser instrument (2) as light source and relative fixed on laser optical path in the photopotential sensing device (6) that is used to receive the metallic cord shade of metallic cord opposite side; The signal processing circuit (7) of photocurrent through comprising I/V change-over circuit and frequency meter of photopotential sensing device (6) output is converted to the frequency of photovoltage; Photopotential sensing device and semiconductor laser all are encapsulated in the load sensor box.
During measurement, the metallic cord two ends are strained and fixed at the deformable body middle part, the power that adds on deformable body makes the metallic cord tension variation by deformable body; Make string produce free oscillation by pulse current in the metallic cord in being in magnetic field; With laser radiation on metallic cord, regulate laser instrument and photopotential sensing device and metallic cord distance, make the vibration shade that produces a metallic cord that obviously amplifies on the photosurface of photopotential sensing device, the photocurrent of photopotential sensing device output is converted to photovoltage, the frequency of measuring light voltage, the tension force that can draw with the vibratory string frequency dependence is loading force information.
The utility model adopts the photoelectricity vibratory string to measure the method for loading, be the principle according to the photopotential sensing device: the photopotential sensing device is a kind of lateral effect silicon photoelectric device, by the planar diffusion manufacturing process, a complete photosurface is arranged, two anode contact points are arranged at the two ends of photosurface.When launching spot was radiated at photosurface S position, the photo-generated carrier that is produced by incident photon was separated by electric field, formed photocurrent at external circuit, and the photocurrent that flows through one of them anode can be represented by the formula:
I
1=I
0(1-S/L) (1) another I
2=I
0S/L (2)
In the formula, I
0Be photogenerated current; L is the distance between two anodes; S is the distance of launching spot apart from anode;
Formula (1), (2) show that photocurrent is linear with facula position S; Facula position that is metallic cord cast shadow change in location can cause photocurrent variations at once.
Compared with prior art, the utility model has following advantage and good effect:
Because what adopt in the utility model is not have photoelectric devices such as used photopotential sensing device and semiconductor laser in vibrating string type sensor in the past, do not belong to inductive load, and all be encapsulated in the load sensor box, do not introduce other interference of light sources, so the noise that the strong electromagnetic that can avoid inductive electromagnetic method to be subject to measure field is brought, thereby adopt the photoelectricity laser measurement can obtain the vibratory string frequency signal more stable than existing method.
When loading changes that the vibratory string tensile force also changes the natural frequency of vibratory string thereupon, because photopotential sensing device and semiconductor laser frequency response are all very high, so adopt this photoelectric method to measure, sensor can reflect the variation of this frequency in time, has enlarged measurement range simultaneously.
To project photopotential sensing device photosurface shade size be nearly ten times of string footpath by changing semiconductor laser and the photopotential sensing device position to metallic cord, can making, thereby the vibratory string amplitude is also amplified nearly ten times, improved the loading detectability.
Description of drawings:
Fig. 1 measures the principle of device synoptic diagram of loading for the photoelectricity vibratory string that adopts semiconductor laser and photopotential sensing device.
Fig. 2 is a PSD signal processing circuit schematic diagram.
Fig. 3 is the drive circuit for laser of automated power control.
Embodiment:
Embodiment 1:
The jinghu string that the concrete device for carrying out said of present embodiment adopts diameter 0.2mm, chord length 30mm is strained and fixed at circular deformable body (1) middle part that can holding capacity as vibratory string (4) two ends, metallic cord one end ground connection, one terminates on the pulse current source (5), and pulse current source adopts the method for capacitor discharge to provide a dutycycle can reach centesimal spike pulse electric current by the metal vibratory string; Adopt two permanent magnets to be fixed on the metallic cord both sides and form magnetic field (3); Semiconductor laser (2) and photopotential sensing device (6) are arranged in the both sides of metal vibratory string (4), and metal vibratory string (4) and photopotential sensing device (6) all are arranged on the laser optical path, and adopting time response here is that 1 μ s is with interior photopotential sensing device (6); By the photocurrent that comprises I/V change-over circuit and frequency meter through the frequency that be converted to photovoltage of signal processing circuit (7) with photopotential sensing device (6) output; Photopotential sensing device and semiconductor laser all are encapsulated in the load sensor box.
Described signal processing circuit (7) as shown in Figure 2.Here the I/V change-over circuit adopts one 4558 double operational F1, and two forward inputs of F1 are received in two signal outputs of PSD respectively, R1, and C1 parallel connection, R2, the C2 parallel connection terminates at the negative sense input of output terminal and the F1 of F1 respectively as negative feedback one.Two output terminals of F1 are connected on the frequency meter, measure the frequency of gained photovoltage.The photocurrent of photopotential sensing device output is converted to photovoltage, and the frequency of measuring light voltage,
The semiconductor laser that present embodiment adopts is furnished with the semiconductor laser device driving circuit of an automated power control, as shown in Figure 3.In this driving circuit, the end of LD and PD is connected on positive 5 volts of voltages together; C5 is used for stabilized supply voltage, positive 5 volts an of termination, an end ground connection.R4 and D1 provide stable operating voltage to K1, positive 5 volts of the termination of R4, a termination amplifier K1 emitter.The end ground connection of D1, one terminates at the emitter of K1.R3 is the direct current biasing that is used to provide K1, an end ground connection, the base stage of a termination K1.The base stage of K1 is connected on the end of PD, and collector is connected on the base stage of K2.K2 is used to provide the drive current of LD.R5 is a current-limiting protection resistance, a termination LD, the base stage of a termination K1.C4, C3 are used for leaching the influence of high frequency interference to LD.The end ground connection of C4, the base stage of a termination K2.Positive 5 volts of the termination of C3, the collector of a termination K2.The grounded emitter of K2.The PD that utilizes semiconductor laser to carry feeds back the light intensity of LD, thereby realizes the stable of light intensity by the drive current of K1 control LD.
During test, laser vertical is radiated on the vibratory string, produces a shade on the photosurface of photopotential sensing device.Feed pulse current in the vibratory string in being in magnetic field of permanent magnet, the vibration of different frequency can appear according to suffered tension force size in vibratory string, owing to adopt the very low pulse current of dutycycle, frequency is very low, be several hertz, so the induction force that produces can only make vibratory string generation free vibration, and can not produce forced vibration, the frequency that records like this is exactly the natural frequency of vibratory string.Should its shade be moved up and down vibration in photosurface simultaneously, the variation that the photocurrent of photopotential sensing device can produce same frequency along with the frequency change of vibratory string vibration, photocurrent is transformed into the correspondent voltage signal through amplifying, by the frequency of measurement voltage signal, just can draw loading size with the frequency dependence of vibratory string.
This measuring method of the utility model can not be subjected to adopting the interference of the extraneous magnetic that magnetic induction sensor is vulnerable to, can obtain stable vibratory string frequency signal, this vibratory string frequency signal and measured power are linear relationships, so can obtain the signal of stable power.The measuring accuracy of sensor is significantly improved, and enlarged measurement range, improve the loading detectability.
Claims (1)
1, a kind of device of photoelectricity vibratory string ergometry, comprise can holding capacity deformable body (1); Two ends are strained and fixed at the metallic cord (4) at deformable body (1) middle part; Metallic cord one end ground connection, one terminates on the pulse current source (5); Be fixed on the magnetic field (3) of metallic cord both sides; It is characterized in that metallic cord one side be provided with laser instrument (2) as light source and relative fixed on laser optical path in the photopotential sensing device (6) that is used to receive the metallic cord shade of metallic cord opposite side; The signal processing circuit (7) of photocurrent through comprising I/V change-over circuit and frequency meter of photopotential sensing device (6) output is converted to the frequency of photovoltage; Photopotential sensing device and semiconductor laser all are encapsulated in the load sensor box.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02292896 CN2591601Y (en) | 2002-12-31 | 2002-12-31 | Photoelectric vibrating string type force-measuring sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02292896 CN2591601Y (en) | 2002-12-31 | 2002-12-31 | Photoelectric vibrating string type force-measuring sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2591601Y true CN2591601Y (en) | 2003-12-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 02292896 Expired - Fee Related CN2591601Y (en) | 2002-12-31 | 2002-12-31 | Photoelectric vibrating string type force-measuring sensor |
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|---|---|
| CN (1) | CN2591601Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101952695B (en) * | 2008-02-13 | 2013-03-06 | 索德罗公司 | Device for improved response when measuring vibration frequency of a vibrating object |
| CN106767746A (en) * | 2017-01-05 | 2017-05-31 | 陈志龙 | Type vibration wire gyro |
-
2002
- 2002-12-31 CN CN 02292896 patent/CN2591601Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101952695B (en) * | 2008-02-13 | 2013-03-06 | 索德罗公司 | Device for improved response when measuring vibration frequency of a vibrating object |
| CN106767746A (en) * | 2017-01-05 | 2017-05-31 | 陈志龙 | Type vibration wire gyro |
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| C14 | Grant of patent or utility model | ||
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| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |