CN104034513A - Device and method for space polarized light extinction ratio measurement - Google Patents
Device and method for space polarized light extinction ratio measurement Download PDFInfo
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- CN104034513A CN104034513A CN201410218391.4A CN201410218391A CN104034513A CN 104034513 A CN104034513 A CN 104034513A CN 201410218391 A CN201410218391 A CN 201410218391A CN 104034513 A CN104034513 A CN 104034513A
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Abstract
The invention discloses a device and method for space polarized light extinction ratio measurement and relates to the field of space polarized light extinction ratio measurement. The measurement device comprises an optical splitter, an optical power measurement system, an extinction ratio measurement system, a signal processing system and a data interface display system. The optical splitter is connected with the optical power measurement system and the extinction ratio measurement system. The optical power measurement system and the extinction ratio measurement system are connected with the signal processing system, the signal processing system is connected with the data interface display system, and an extinction ratio measuring probe is separated from an extinction ratio measurement host. The measurement device is simple in structure and low in cost, measured results are stable, and through application of the device and the method, the space polarized light extinction ratio can be measured, and the polarized light extinction ratio in an optical fiber can also be measured.
Description
Technical field
The present invention relates to polarized light extinction ratio measurement field, space, specifically relate to a kind of space polarized light extinction ratio measurement device and method.
Background technology
PER (Polarization Extinction Ration, polarization extinction ratio) refers to that for light source, extinction ratio is higher along magnitude relationship between two orthogonal polarization components of principal state of polarization (psp) Directional Decomposition, and output light more approaches linearly polarized light.For polarizer, extinction ratio is higher, and the ability that input light is become to linearly polarized light is stronger.Concerning polarization maintaining optical fibre coupling, extinction ratio is that the lotus root when characterizing polarized light and be coupled to various components and parts is closed quality, and in coupling process, a small amount of polarized light intensity inevitably there will be in non-incident axially, this is called polarization cross dialogue effect, and extinction ratio is used for to its quantification.Extinction ratio is larger, and it is just better that lotus root is closed quality.
The measurement of extinction ratio characterisitic parameter mainly adopts rotatory polarization device method, supposes that the extinction ratio of polarizer is enough high, is greater than the extinction ratio of light source, and can continuous rotation.When polarizer play folk prescription when overlapping with the main state direction of input light polarization, the peak power that power meter detects is P
max; When polarizer play folk prescription when with the main state direction of input light polarization quadrature, the minimum power that power meter detects is P
min, polarization extinction ratio just can calculate by following formula like this:
Wherein, PER is polarization extinction ratio, P
maxpeak power, P
minit is minimum power.
Researchist has carried out large quantity research to extinction ratio proving installation both at home and abroad, the commercialization of extinction ratio tester that integrated light source and automaticity are very high, generally adopt the elements such as lenticule and optical fiber collimator, by light path adjustment and fix, on light source and tester, are all furnished with the joints of optical fibre of standard, flexible jumper is inserted in the two ends of tested optical fiber, receive on light source and tester, finally on display screen, directly demonstrate extinction ratio, polarizer rotates one week, can record four maximal values of extinction ratio, and the polarizer angles at adjacent two maximal value places is orthogonal, these angles are exactly the fast axle of polarization-maintaining fiber and the position of slow axis.There are this series products in AM General photoelectricity, Canadian OZ Optics company, Korea S fiberpro company, Japanese santec company, and still, the price of this series products is very expensive, is not easy to extensive use; And, the extinction ratio testing tool that these companies produce can only carry out extinction ratio measurement to the polarized light in polarization maintaining optical fibre, if the extinction ratio of measurement light source, the polarized light that light source must be sent imports in polarization maintaining optical fibre, could measure its extinction ratio, so just limit the application of these instruments; In addition, the accuracy of these products is vulnerable to the impact of the tightness of the cut quality of fiber end face, focal position and clamping, and measurement result is unstable.
Summary of the invention
The object of the invention is in order to overcome the deficiency of above-mentioned background technology, a kind of space polarized light extinction ratio measurement device and method are provided, measurement mechanism simple in structure, cost is low, measurement result is stable, can measurement space polarized light extinction ratio, the polarized light extinction ratio in again can measuring optical fiber.
The invention provides a kind of space polarized light extinction ratio measurement device, comprise optical branching device, measuring light power system, extinction ratio measurement system, signal processing system and data-interface display system, optical branching device respectively with measuring light power system, extinction ratio measurement system is connected, measuring light power system, extinction ratio measurement system is all connected with signal processing system, signal processing system is connected with data-interface display system, described measuring light power system comprises the first condenser lens being connected in turn, the first photoelectric commutator, first signal amplifier, the first A/D converter, described extinction ratio measurement system comprises rotatable polarizer, the second condenser lens, the second photoelectric commutator, secondary signal amplifier, the second A/D converter, motor and electric machine controller, polarizer, the second condenser lens, the second photoelectric commutator, secondary signal amplifier, the second A/D converter is connected in turn, the control end of polarizer is connected with motor, motor is connected with electric machine controller,
Described optical branching device, the first condenser lens, the first photoelectric commutator, polarizer, the second condenser lens, the second photoelectric commutator and motor are all positioned on extinction ratio measurement probe, first signal amplifier, the first A/D converter, secondary signal amplifier, the second A/D converter, electric machine controller, signal processing system and data-interface display system are all positioned on extinction ratio measurement main frame, and extinction ratio measurement probe is separated with extinction ratio measurement main frame;
Described signal processing system comprises micro-processing arithmetical unit, power-supply controller of electric and data-carrier store, power-supply controller of electric, data-carrier store are all connected with micro-processing arithmetical unit, and micro-processing arithmetical unit is also connected with the first A/D converter, the second A/D converter, electric machine controller respectively;
Described data-interface display system includes OLED OLED display, button and various general-purpose interface, and OLED display, button, various general-purpose interface are all connected with micro-processing arithmetical unit;
Polarized light to be measured is divided into two bundles polarized light to be measured by optical branching device, and a branch of polarized light to be measured enters measuring light power system, and a branch of polarized light to be measured enters extinction ratio measurement system in addition;
A branch of polarized light to be measured enters measuring light power system, after focusing on, the first condenser lens enters the first photoelectric commutator, the first photoelectric commutator is converted to electric signal by polarized light to be measured, electric signal enters first signal amplifier, first signal amplifier amplifies electric signal, electric signal after amplification enters the first A/D converter, the first A/D converter is converted to digital signal by the electric signal after amplifying, micro-processing arithmetical unit in digital signal entering signal disposal system, micro-processing arithmetical unit, by detecting the size of electric signal, is obtained the luminous power of polarized light to be measured;
A branch of polarized light to be measured enters extinction ratio measurement system in addition, first enter in the polarizer according to given pace rotation, polarizer is decomposed into transmitted light o light and this two-beam of transmitted light e light by this polarized light to be measured, transmitted light e light enters the second photoelectric commutator after the second condenser lens focuses on, the second photoelectric commutator converts transmitted light e light to electric signal, the electric signal of the second photoelectric commutator output enters secondary signal amplifier, secondary signal amplifier amplifies this electric signal, electric signal after amplification enters the second A/D converter, the second A/D converter is converted to digital signal by the electric signal after amplifying, micro-processing arithmetical unit in digital signal entering signal disposal system, micro-processing arithmetical unit is by detecting the size of electric signal, measure the light intensity of transmitted light e light, micro-processing arithmetical unit is controlled electric machine controller, motor controller controls motor, Electric Machine Control polarizer rotates by the speed of given pace, the time that the motor of take rotates a circle is a cycle, the power that extinction ratio measurement system is measured transmitted light e light has four extreme values in one-period: two maximum value and two minimal values, and the polarizer angles at adjacent two maximal value places is orthogonal, micro-processing arithmetical unit, by extinction ratio formula, is obtained the extinction ratio of polarized light to be measured.
On the basis of technique scheme, described extinction ratio measurement system adopts pulse code formula, close-loop feedback to control, according to the variation tendency of the extinction ratio of real-time measurement, adjust the sense of rotation of polarizer, the descending progressively fine tuning of adjusting of the anglec of rotation, when polarizer play folk prescription when overlapping with the main state direction of input light polarization, extinction ratio measurement system detects the peak power P of transmitted light e light
max; When polarizer play folk prescription when with the main state direction of input light polarization quadrature, extinction ratio measurement system detects the minimum power P of transmitted light e light
min, then micro-processing arithmetical unit passes through formula
calculate the extinction ratio of polarized light to be measured, wherein, PER is polarization extinction ratio, P
maxthe peak power of transmitted light e light, P
minit is the minimum power of transmitted light e light.
On the basis of technique scheme, between described optical branching device and polarized light to be measured, be fixed with optical fiber ring flange.
On the basis of technique scheme, described motor is servomotor or stepper motor.
On the basis of technique scheme, the motor in described extinction ratio measurement system is solid spindle motor or hollow rotating shaft motor.
On the basis of technique scheme, when the motor in described extinction ratio measurement system is solid spindle motor, polarizer in extinction ratio measurement system is fixed on the shell of extinction ratio measurement probe by bearing, polarizer can carry out 360 ° of rotations around the central shaft of extinction ratio measurement probe, polarizer comprises polarizing prism and polarizing prism support, and polarizing prism is fixed on polarizing prism support; The second photoelectric commutator in extinction ratio measurement system is fixed on the shell of extinction ratio measurement probe; On the main shaft of solid spindle motor, be fixed with driving gear, on polarizer, be fixed with the follower gear mating with driving gear, between solid spindle motor and polarizer by the engaged transmission of driving gear and follower gear; The rotation of solid spindle motor, drives driving gear rotation; Driving gear rotation, drives follower gear rotation; Follower gear rotation, drives polarizer rotation; Extinction ratio measurement system is measured peak power and the minimum power of transmitted light e light, and micro-processing arithmetical unit is obtained the extinction ratio of polarized light to be measured.
On the basis of technique scheme, when the motor in described extinction ratio measurement system is hollow shaft motor, the second photoelectric commutator in extinction ratio measurement system is fixed on the shell of extinction ratio measurement probe, hollow shaft motor comprises tubular shaft, polarizer is fixed on the inside of tubular shaft one end of hollow shaft motor, the second photoelectric commutator is fixed on the other end of tubular shaft, in tubular shaft, be provided with baffle plate, polarizer is fixed by the baffle plate in tubular shaft, and tubular shaft is connected with hollow shaft motor by bearing; Tubular shaft rotates, and drives polarizer to rotate, and extinction ratio measurement system is measured peak power and the minimum power of transmitted light e light, and micro-processing arithmetical unit is obtained the extinction ratio of polarized light to be measured.
The present invention also provides a kind of space polarized light extinction ratio measurement method based on above-mentioned measurement mechanism, comprises the following steps:
Polarized light to be measured is divided into two bundles polarized light to be measured by optical branching device, and a branch of polarized light to be measured enters measuring light power system, and a branch of polarized light to be measured enters extinction ratio measurement system in addition;
A branch of polarized light to be measured enters measuring light power system, after focusing on, the first condenser lens enters the first photoelectric commutator, the first photoelectric commutator is converted to electric signal by polarized light to be measured, electric signal enters first signal amplifier, first signal amplifier amplifies electric signal, electric signal after amplification enters the first A/D converter, the first A/D converter is converted to digital signal by the electric signal after amplifying, micro-processing arithmetical unit in digital signal entering signal disposal system, micro-processing arithmetical unit, by detecting the size of electric signal, is obtained the luminous power of polarized light to be measured;
A branch of polarized light to be measured enters extinction ratio measurement system in addition, first enter in the polarizer according to given pace rotation, polarizer is decomposed into transmitted light o light and this two-beam of transmitted light e light by this polarized light to be measured, transmitted light e light enters the second photoelectric commutator after the second condenser lens focuses on, the second photoelectric commutator converts transmitted light e light to electric signal, the electric signal of the second photoelectric commutator output enters secondary signal amplifier, secondary signal amplifier amplifies this electric signal, electric signal after amplification enters the second A/D converter, the second A/D converter is converted to digital signal by the electric signal after amplifying, micro-processing arithmetical unit in digital signal entering signal disposal system, micro-processing arithmetical unit is by detecting the size of electric signal, measure the light intensity of transmitted light e light, micro-processing arithmetical unit is controlled electric machine controller, motor controller controls motor, Electric Machine Control polarizer rotates by the speed of given pace, the time that the motor of take rotates a circle is a cycle, the power that extinction ratio measurement system is measured transmitted light e light has four extreme values in one-period: two maximum value and two minimal values, and the polarizer angles at adjacent two maximal value places is orthogonal, micro-processing arithmetical unit, by extinction ratio formula, is obtained the extinction ratio of polarized light to be measured.
On the basis of technique scheme, described extinction ratio measurement system adopts pulse code formula, close-loop feedback to control, according to the variation tendency of the extinction ratio of real-time measurement, adjust the sense of rotation of polarizer, the descending progressively fine tuning of adjusting of the anglec of rotation, when polarizer play folk prescription when overlapping with the main state direction of input light polarization, extinction ratio measurement system detects the peak power P of transmitted light e light
max; When polarizer play folk prescription when with the main state direction of input light polarization quadrature, extinction ratio measurement system detects the minimum power P of transmitted light e light
min, then micro-processing arithmetical unit passes through formula
calculate the extinction ratio of polarized light to be measured, wherein, PER is polarization extinction ratio, P
maxthe peak power of transmitted light e light, P
minit is the minimum power of transmitted light e light.
On the basis of technique scheme, the motor in described extinction ratio measurement system is solid spindle motor or hollow rotating shaft motor;
When the motor in described extinction ratio measurement system is solid spindle motor, polarizer in extinction ratio measurement system is fixed on the shell of extinction ratio measurement probe by bearing, polarizer can carry out 360 ° of rotations around the central shaft of extinction ratio measurement probe, polarizer comprises polarizing prism and polarizing prism support, and polarizing prism is fixed on polarizing prism support; The second photoelectric commutator in extinction ratio measurement system is fixed on the shell of extinction ratio measurement probe; On the main shaft of solid spindle motor, be fixed with driving gear, on polarizer, be fixed with the follower gear mating with driving gear, between solid spindle motor and polarizer by the engaged transmission of driving gear and follower gear; The rotation of solid spindle motor, drives driving gear rotation; Driving gear rotation, drives follower gear rotation; Follower gear rotation, drives polarizer rotation; Extinction ratio measurement system is measured peak power and the minimum power of transmitted light e light, and micro-processing arithmetical unit is obtained the extinction ratio of polarized light to be measured;
When the motor in described extinction ratio measurement system is hollow shaft motor, the second photoelectric commutator in extinction ratio measurement system is fixed on the shell of extinction ratio measurement probe, hollow shaft motor comprises tubular shaft, polarizer is fixed on the inside of tubular shaft one end of hollow shaft motor, the second photoelectric commutator is fixed on the other end of tubular shaft, in tubular shaft, be provided with baffle plate, polarizer is fixed by the baffle plate in tubular shaft, and tubular shaft is connected with hollow shaft motor by bearing; Tubular shaft rotates, and drives polarizer to rotate, and extinction ratio measurement system is measured peak power and the minimum power of transmitted light e light, and micro-processing arithmetical unit is obtained the extinction ratio of polarized light to be measured.
Compared with prior art, advantage of the present invention is as follows:
Measurement mechanism of the present invention adopts the extinction ratio measurement probe structure separated with main frame, first rotatory polarization device method is applied to the measurement of space extinction ratio, extinction ratio measurement probe can voluntary activity, be convenient to measure the extinction ratio of the space polarized light of different places, this measurement mechanism has the advantages such as simple in structure, cost is low, measurement result is stable, extinction ratio that can either measurement space polarized light, again can measuring optical fiber in the extinction ratio of polarized light.
Accompanying drawing explanation
Fig. 1 is the theory diagram of polarized light extinction ratio measurement device in space in the embodiment of the present invention.
Fig. 2 is the front view of the motor of measurement mechanism in embodiment 1 while being common solid spindle motor.
Fig. 3 is the left view of the motor of measurement mechanism in embodiment 2 while being hollow shaft motor.
Fig. 4 is the sectional view of the motor of measurement mechanism in embodiment 2 while being hollow shaft motor.
Reference numeral: the shell of 1-extinction ratio measurement probe, 2-driving gear, 3-solid spindle motor, 4-follower gear, 5-polarizer, 6-baffle plate, 7-tubular shaft, 8-the second photoelectric commutator, 9-hollow shaft motor.
Embodiment
Below in conjunction with drawings and the specific embodiments, the present invention is described in further detail.
Shown in Figure 1, the embodiment of the present invention provides a kind of space polarized light extinction ratio measurement device, comprise optical branching device, measuring light power system, extinction ratio measurement system, signal processing system and data-interface display system, optical branching device is connected with measuring light power system, extinction ratio measurement system respectively, measuring light power system, extinction ratio measurement system are all connected with signal processing system, and signal processing system is connected with data-interface display system.
Shown in Figure 1, measuring light power system comprises the first condenser lens, the first photoelectric commutator, first signal amplifier, the first A/D converter being connected in turn, extinction ratio measurement system comprises rotatable polarizer, the second condenser lens, the second photoelectric commutator, secondary signal amplifier, the second A/D converter, motor and electric machine controller, and polarizer, the second condenser lens, the second photoelectric commutator, secondary signal amplifier, the second A/D converter are connected in turn.The control end of polarizer is connected with motor, and motor is connected with electric machine controller.This motor can be both servomotor, can be also common stepper motor; This motor can be both common solid spindle motor, can be also hollow rotating shaft motor.
Shown in Figure 1, optical branching device, the first condenser lens, the first photoelectric commutator, polarizer, the second condenser lens, the second photoelectric commutator and motor are all positioned on extinction ratio measurement probe, first signal amplifier, the first A/D converter, secondary signal amplifier, the second A/D converter, electric machine controller, signal processing system and data-interface display system are all positioned on extinction ratio measurement main frame, and extinction ratio measurement probe is separated with extinction ratio measurement main frame.
Between optical branching device and polarized light to be measured, can fix a dismountable optical fiber ring flange, be convenient to the extinction ratio of polarized light in detection fiber.
Shown in Figure 1, signal processing system comprises micro-processing arithmetical unit, power-supply controller of electric and data-carrier store, power-supply controller of electric, data-carrier store are all connected with micro-processing arithmetical unit, and micro-processing arithmetical unit is also connected with the first A/D converter, the second A/D converter, electric machine controller respectively.Data-interface display system comprises OLED (Organic Light-Emitting Diode, Organic Light Emitting Diode) display, button and various general-purpose interface, and OLED display, button, various general-purpose interface are all connected with micro-processing arithmetical unit.
The embodiment of the present invention also provides a kind of space polarized light extinction ratio measurement method based on above-mentioned measurement mechanism, comprises the following steps:
Polarized light to be measured is divided into two bundles polarized light to be measured by optical branching device, and a branch of polarized light to be measured enters measuring light power system, and a branch of polarized light to be measured enters extinction ratio measurement system in addition;
A branch of polarized light to be measured enters measuring light power system, after focusing on, the first condenser lens enters the first photoelectric commutator, the first photoelectric commutator is converted to electric signal by polarized light to be measured, electric signal enters first signal amplifier, first signal amplifier amplifies electric signal, electric signal after amplification enters the first A/D converter, the first A/D converter is converted to digital signal by the electric signal after amplifying, micro-processing arithmetical unit in digital signal entering signal disposal system, micro-processing arithmetical unit, by detecting the size of electric signal, is obtained the luminous power of polarized light to be measured;
A branch of polarized light to be measured enters extinction ratio measurement system in addition, first enter in the polarizer according to given pace rotation, polarizer is decomposed into transmitted light o light and this two-beam of transmitted light e light by this polarized light to be measured, transmitted light e light enters the second photoelectric commutator after the second condenser lens focuses on, the second photoelectric commutator converts transmitted light e light to electric signal, the electric signal of the second photoelectric commutator output enters secondary signal amplifier, secondary signal amplifier amplifies this electric signal, electric signal after amplification enters the second A/D converter, the second A/D converter is converted to digital signal by the electric signal after amplifying, micro-processing arithmetical unit in digital signal entering signal disposal system, micro-processing arithmetical unit is by detecting the size of electric signal, measure the light intensity of transmitted light e light, the size of electric signal is directly proportional to light intensity.Micro-processing arithmetical unit is controlled electric machine controller, motor controller controls motor, Electric Machine Control polarizer rotates by the speed of given pace, the time that the motor of take rotates a circle is a cycle, the power that extinction ratio measurement system is measured transmitted light e light has four extreme values in one-period: two maximum value and two minimal values, and the polarizer angles at adjacent two maximal value places is orthogonal, micro-processing arithmetical unit, by extinction ratio formula, is obtained the extinction ratio of polarized light to be measured.
Extinction ratio measurement system adopts pulse code formula, close-loop feedback to control, according to the variation tendency of the extinction ratio of real-time measurement, adjust the sense of rotation of polarizer, the descending progressively fine tuning of adjusting of the anglec of rotation, when polarizer play folk prescription when overlapping with the main state direction of input light polarization, extinction ratio measurement system detects the peak power P of transmitted light e light
max; When polarizer play folk prescription when with the main state direction of input light polarization quadrature, extinction ratio measurement system detects the minimum power P of transmitted light e light
min, then micro-processing arithmetical unit passes through formula
calculate the extinction ratio of polarized light to be measured, wherein, PER is polarization extinction ratio, P
maxthe peak power of transmitted light e light, P
minit is the minimum power of transmitted light e light.
The principle of the embodiment of the present invention is described below:
The Main Function of the first condenser lens is: polarized light to be measured focuses on out from optical branching device, acts on better on the first photoelectric commutator.Because the receptor area of the first opto-electronic conversion front end is smaller, in order to measure more accurately luminous power, so need to arrange the first condenser lens between optical branching device and the first photoelectric commutator.
The Main Function of the second condenser lens is: polarized light to be measured focuses on out from polarizer, acts on better on the second photoelectric commutator.Because the receptor area of the second opto-electronic conversion front end is smaller, in order to measure more accurately light intensity, so need to arrange the second condenser lens between polarizer and the second photoelectric commutator.
Electric machine controller is exactly the driving circuit of motor, micro-processing arithmetical unit is controlled driving circuit by voltage, driving circuit is by changing the frequency of electric pulse, the rotating speed that amplitude is controlled motor, then motor is given feedback signal of micro-processing arithmetical unit again, by certain algorithm, when extinction ratio extreme value, by controlling electric machine controller, the rotating speed of motor is diminished gradually, until extinction ratio extreme value.Also just realized the descending progressively fine tuning of adjusting of the polarizer anglec of rotation.
The motor of take respectively below adopts common solid spindle motor, hollow shaft motor to describe as example.
Embodiment 1: motor is common solid spindle motor
Shown in Figure 2, the polarizer 5 in extinction ratio measurement system is fixed on by bearing on the shell 1 of extinction ratio measurement probe, and polarizer 5 can carry out 360 ° of rotations around the central shaft of extinction ratio measurement probe.Polarizer 5 comprises polarizing prism and polarizing prism support, and polarizing prism is fixed on polarizing prism support.Motor in extinction ratio measurement system adopts common solid spindle motor 3, between solid spindle motor 3 and polarizer 5, both can, by gear drive, also can pass through belt gear.The second photoelectric commutator in extinction ratio measurement system is fixed on the shell 1 of extinction ratio measurement probe, is not to be fixed on polarizer 5, so do not draw the second photoelectric commutator in Fig. 2.
Shown in Figure 2, in embodiment 1, on the main shaft of solid spindle motor 3, be fixed with driving gear 2, on polarizer 5, be fixed with the follower gear 4 mating with driving gear 2, between solid spindle motor 3 and polarizer 5, pass through the engaged transmission of driving gear 2 and follower gear 4.
3 rotations of solid spindle motor, drive driving gear 2 rotations; Driving gear 2 rotations, drive follower gear 4 rotations; Follower gear 4 rotations, drive polarizer 5 rotations.Extinction ratio measurement system is measured peak power and the minimum power of transmitted light e light, and micro-processing arithmetical unit is obtained the extinction ratio of polarized light to be measured.
Embodiment 2: motor is hollow shaft motor
Shown in Fig. 3, Fig. 4, the second photoelectric commutator 8 in extinction ratio measurement system is fixed on the shell of extinction ratio measurement probe, is not to be fixed on polarizer 5, so the second photoelectric commutator 8 is unsettled.Motor in extinction ratio measurement system adopts hollow shaft motor 9, hollow shaft motor 9 comprises tubular shaft 7 (being the rotor of hollow shaft motor 9), polarizer 5 is fixed on the inside of tubular shaft 7 one end of hollow shaft motor 9, the second photoelectric commutator 8 is fixed on the other end of tubular shaft 7, in tubular shaft 7, be provided with baffle plate 6, polarizer 5 is fixing by the baffle plate 6 in tubular shaft 7, and tubular shaft 7 is connected with hollow shaft motor 9 by bearing.
Polarizer 5 is fixed on tubular shaft 7, tubular shaft 7 (being the rotor of hollow shaft motor 9) rotates, drive polarizer 5 to rotate, extinction ratio measurement system is measured peak power and the minimum power of transmitted light e light, and micro-processing arithmetical unit is obtained the extinction ratio of polarized light to be measured.
Those skilled in the art can carry out various modifications and variations to the embodiment of the present invention, if these revise and modification within the scope of the claims in the present invention and equivalent technologies thereof, these modifications and modification are also within protection scope of the present invention.
The prior art that the content of not describing in detail in instructions is known to the skilled person.
Claims (10)
1. a space polarized light extinction ratio measurement device, comprise optical branching device, measuring light power system, extinction ratio measurement system, signal processing system and data-interface display system, optical branching device respectively with measuring light power system, extinction ratio measurement system is connected, measuring light power system, extinction ratio measurement system is all connected with signal processing system, signal processing system is connected with data-interface display system, it is characterized in that: described measuring light power system comprises the first condenser lens being connected in turn, the first photoelectric commutator, first signal amplifier, the first A/D converter, described extinction ratio measurement system comprises rotatable polarizer, the second condenser lens, the second photoelectric commutator, secondary signal amplifier, the second A/D converter, motor and electric machine controller, polarizer, the second condenser lens, the second photoelectric commutator, secondary signal amplifier, the second A/D converter is connected in turn, the control end of polarizer is connected with motor, motor is connected with electric machine controller,
Described optical branching device, the first condenser lens, the first photoelectric commutator, polarizer, the second condenser lens, the second photoelectric commutator and motor are all positioned on extinction ratio measurement probe, first signal amplifier, the first A/D converter, secondary signal amplifier, the second A/D converter, electric machine controller, signal processing system and data-interface display system are all positioned on extinction ratio measurement main frame, and extinction ratio measurement probe is separated with extinction ratio measurement main frame;
Described signal processing system comprises micro-processing arithmetical unit, power-supply controller of electric and data-carrier store, power-supply controller of electric, data-carrier store are all connected with micro-processing arithmetical unit, and micro-processing arithmetical unit is also connected with the first A/D converter, the second A/D converter, electric machine controller respectively;
Described data-interface display system includes OLED OLED display, button and various general-purpose interface, and OLED display, button, various general-purpose interface are all connected with micro-processing arithmetical unit;
Polarized light to be measured is divided into two bundles polarized light to be measured by optical branching device, and a branch of polarized light to be measured enters measuring light power system, and a branch of polarized light to be measured enters extinction ratio measurement system in addition;
A branch of polarized light to be measured enters measuring light power system, after focusing on, the first condenser lens enters the first photoelectric commutator, the first photoelectric commutator is converted to electric signal by polarized light to be measured, electric signal enters first signal amplifier, first signal amplifier amplifies electric signal, electric signal after amplification enters the first A/D converter, the first A/D converter is converted to digital signal by the electric signal after amplifying, micro-processing arithmetical unit in digital signal entering signal disposal system, micro-processing arithmetical unit, by detecting the size of electric signal, is obtained the luminous power of polarized light to be measured;
A branch of polarized light to be measured enters extinction ratio measurement system in addition, first enter in the polarizer according to given pace rotation, polarizer is decomposed into transmitted light o light and this two-beam of transmitted light e light by this polarized light to be measured, transmitted light e light enters the second photoelectric commutator after the second condenser lens focuses on, the second photoelectric commutator converts transmitted light e light to electric signal, the electric signal of the second photoelectric commutator output enters secondary signal amplifier, secondary signal amplifier amplifies this electric signal, electric signal after amplification enters the second A/D converter, the second A/D converter is converted to digital signal by the electric signal after amplifying, micro-processing arithmetical unit in digital signal entering signal disposal system, micro-processing arithmetical unit is by detecting the size of electric signal, measure the light intensity of transmitted light e light, micro-processing arithmetical unit is controlled electric machine controller, motor controller controls motor, Electric Machine Control polarizer rotates by the speed of given pace, the time that the motor of take rotates a circle is a cycle, the power that extinction ratio measurement system is measured transmitted light e light has four extreme values in one-period: two maximum value and two minimal values, and the polarizer angles at adjacent two maximal value places is orthogonal, micro-processing arithmetical unit, by extinction ratio formula, is obtained the extinction ratio of polarized light to be measured.
2. space as claimed in claim 1 polarized light extinction ratio measurement device, it is characterized in that: described extinction ratio measurement system adopts pulse code formula, close-loop feedback to control, according to the variation tendency of the extinction ratio of real-time measurement, adjust the sense of rotation of polarizer, the descending progressively fine tuning of adjusting of the anglec of rotation, when polarizer play folk prescription when overlapping with the main state direction of input light polarization, extinction ratio measurement system detects the peak power P of transmitted light e light
max; When polarizer play folk prescription when with the main state direction of input light polarization quadrature, extinction ratio measurement system detects the minimum power P of transmitted light e light
min, then micro-processing arithmetical unit passes through formula
calculate the extinction ratio of polarized light to be measured, wherein, PER is polarization extinction ratio, P
maxthe peak power of transmitted light e light, P
minit is the minimum power of transmitted light e light.
3. space as claimed in claim 1 polarized light extinction ratio measurement device, is characterized in that: between described optical branching device and polarized light to be measured, be fixed with optical fiber ring flange.
4. space as claimed in claim 1 polarized light extinction ratio measurement device, is characterized in that: described motor is servomotor or stepper motor.
5. the space polarized light extinction ratio measurement device as described in any one in claim 1 to 4, is characterized in that: the motor in described extinction ratio measurement system is solid spindle motor or hollow rotating shaft motor.
6. space as claimed in claim 5 polarized light extinction ratio measurement device, it is characterized in that: when the motor in described extinction ratio measurement system is solid spindle motor, polarizer in extinction ratio measurement system is fixed on the shell of extinction ratio measurement probe by bearing, polarizer can carry out 360 ° of rotations around the central shaft of extinction ratio measurement probe, polarizer comprises polarizing prism and polarizing prism support, and polarizing prism is fixed on polarizing prism support; The second photoelectric commutator in extinction ratio measurement system is fixed on the shell of extinction ratio measurement probe; On the main shaft of solid spindle motor, be fixed with driving gear, on polarizer, be fixed with the follower gear mating with driving gear, between solid spindle motor and polarizer by the engaged transmission of driving gear and follower gear; The rotation of solid spindle motor, drives driving gear rotation; Driving gear rotation, drives follower gear rotation; Follower gear rotation, drives polarizer rotation; Extinction ratio measurement system is measured peak power and the minimum power of transmitted light e light, and micro-processing arithmetical unit is obtained the extinction ratio of polarized light to be measured.
7. space as claimed in claim 5 polarized light extinction ratio measurement device, it is characterized in that: when the motor in described extinction ratio measurement system is hollow shaft motor, the second photoelectric commutator in extinction ratio measurement system is fixed on the shell of extinction ratio measurement probe, hollow shaft motor comprises tubular shaft, polarizer is fixed on the inside of tubular shaft one end of hollow shaft motor, the second photoelectric commutator is fixed on the other end of tubular shaft, in tubular shaft, be provided with baffle plate, polarizer is fixed by the baffle plate in tubular shaft, and tubular shaft is connected with hollow shaft motor by bearing; Tubular shaft rotates, and drives polarizer to rotate, and extinction ratio measurement system is measured peak power and the minimum power of transmitted light e light, and micro-processing arithmetical unit is obtained the extinction ratio of polarized light to be measured.
8. the space polarized light extinction ratio measurement method based on measurement mechanism described in any one in claim 1 to 7, is characterized in that, comprises the following steps:
Polarized light to be measured is divided into two bundles polarized light to be measured by optical branching device, and a branch of polarized light to be measured enters measuring light power system, and a branch of polarized light to be measured enters extinction ratio measurement system in addition;
A branch of polarized light to be measured enters measuring light power system, after focusing on, the first condenser lens enters the first photoelectric commutator, the first photoelectric commutator is converted to electric signal by polarized light to be measured, electric signal enters first signal amplifier, first signal amplifier amplifies electric signal, electric signal after amplification enters the first A/D converter, the first A/D converter is converted to digital signal by the electric signal after amplifying, micro-processing arithmetical unit in digital signal entering signal disposal system, micro-processing arithmetical unit, by detecting the size of electric signal, is obtained the luminous power of polarized light to be measured;
A branch of polarized light to be measured enters extinction ratio measurement system in addition, first enter in the polarizer according to given pace rotation, polarizer is decomposed into transmitted light o light and this two-beam of transmitted light e light by this polarized light to be measured, transmitted light e light enters the second photoelectric commutator after the second condenser lens focuses on, the second photoelectric commutator converts transmitted light e light to electric signal, the electric signal of the second photoelectric commutator output enters secondary signal amplifier, secondary signal amplifier amplifies this electric signal, electric signal after amplification enters the second A/D converter, the second A/D converter is converted to digital signal by the electric signal after amplifying, micro-processing arithmetical unit in digital signal entering signal disposal system, micro-processing arithmetical unit is by detecting the size of electric signal, measure the light intensity of transmitted light e light, micro-processing arithmetical unit is controlled electric machine controller, motor controller controls motor, Electric Machine Control polarizer rotates by the speed of given pace, the time that the motor of take rotates a circle is a cycle, the power that extinction ratio measurement system is measured transmitted light e light has four extreme values in one-period: two maximum value and two minimal values, and the polarizer angles at adjacent two maximal value places is orthogonal, micro-processing arithmetical unit, by extinction ratio formula, is obtained the extinction ratio of polarized light to be measured.
9. space as claimed in claim 8 polarized light extinction ratio measurement method, it is characterized in that: described extinction ratio measurement system adopts pulse code formula, close-loop feedback to control, according to the variation tendency of the extinction ratio of real-time measurement, adjust the sense of rotation of polarizer, the descending progressively fine tuning of adjusting of the anglec of rotation, when polarizer play folk prescription when overlapping with the main state direction of input light polarization, extinction ratio measurement system detects the peak power P of transmitted light e light
max; When polarizer play folk prescription when with the main state direction of input light polarization quadrature, extinction ratio measurement system detects the minimum power P of transmitted light e light
min, then micro-processing arithmetical unit passes through formula
calculate the extinction ratio of polarized light to be measured, wherein, PER is polarization extinction ratio, P
maxthe peak power of transmitted light e light, P
minit is the minimum power of transmitted light e light.
10. space polarized light extinction ratio measurement method as claimed in claim 8 or 9, is characterized in that: the motor in described extinction ratio measurement system is solid spindle motor or hollow rotating shaft motor;
When the motor in described extinction ratio measurement system is solid spindle motor, polarizer in extinction ratio measurement system is fixed on the shell of extinction ratio measurement probe by bearing, polarizer can carry out 360 ° of rotations around the central shaft of extinction ratio measurement probe, polarizer comprises polarizing prism and polarizing prism support, and polarizing prism is fixed on polarizing prism support; The second photoelectric commutator in extinction ratio measurement system is fixed on the shell of extinction ratio measurement probe; On the main shaft of solid spindle motor, be fixed with driving gear, on polarizer, be fixed with the follower gear mating with driving gear, between solid spindle motor and polarizer by the engaged transmission of driving gear and follower gear; The rotation of solid spindle motor, drives driving gear rotation; Driving gear rotation, drives follower gear rotation; Follower gear rotation, drives polarizer rotation; Extinction ratio measurement system is measured peak power and the minimum power of transmitted light e light, and micro-processing arithmetical unit is obtained the extinction ratio of polarized light to be measured;
When the motor in described extinction ratio measurement system is hollow shaft motor, the second photoelectric commutator in extinction ratio measurement system is fixed on the shell of extinction ratio measurement probe, hollow shaft motor comprises tubular shaft, polarizer is fixed on the inside of tubular shaft one end of hollow shaft motor, the second photoelectric commutator is fixed on the other end of tubular shaft, in tubular shaft, be provided with baffle plate, polarizer is fixed by the baffle plate in tubular shaft, and tubular shaft is connected with hollow shaft motor by bearing; Tubular shaft rotates, and drives polarizer to rotate, and extinction ratio measurement system is measured peak power and the minimum power of transmitted light e light, and micro-processing arithmetical unit is obtained the extinction ratio of polarized light to be measured.
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