CN110772236A - Pulse feeling sensor based on directional coupler and pulse condition measuring device - Google Patents

Abstract

The invention discloses a pulse cutting sensor and a pulse condition measuring device based on a directional coupler, belonging to the field of integrated optical waveguides, comprising: an elastic film and a pulse sensing unit array embedded in it; A coupler, and two photodetectors connected to the two output ends of the 1×2 directional coupler respectively, are used to detect the output light intensity of the two output ends of the 1×2 directional coupler and convert them into electrical signals; work When the laser is input through the input end of the 1×2 directional coupler, the elastic film is attached to the pulse of the radial artery at the back of the wrist. The electrical signal output by the output end of the photodetector changes, thereby realizing the sensing of the pulse. The invention has high sensing sensitivity, does not need to manually locate the accurate positions of the three parts of the cunguan and chi, and can acquire the two-dimensional pulse information of the entire radial artery pulse.

Description

A pulse cutting sensor and pulse condition measuring device based on directional coupler

technical field

The invention belongs to the field of integrated optical waveguides, and more particularly relates to a pulse cutting sensor and a pulse condition measuring device based on a directional coupler.

Background technique

In TCM diagnosis, "look", "smell", "ask" and "cut" are the four most basic and important diagnostic methods, collectively referred to as the four diagnostic methods. Among them, "cut" refers to cutting the pulse. The traditional way of cutting the pulse is that the doctor observes the pulse changes through the finger at the pulse of the radial artery at the back of the wrist, so as to distinguish the rise and fall of the function of the viscera and the stagnation of qi, blood and essence. From the perspective of modern biology, pulse is an oscillation of blood and blood vessel wall caused by the ejection activity of the inner heart. Due to the dispersion of harmonics of different frequency components, the viscosity of blood and blood vessel wall dampens the pulse wave. Influenced by factors such as the superposition of reflected waves generated by peripheral vessels, the pulse wave has undergone great changes and carries rich physiological information. However, in the traditional pulse cutting process, it relies on the doctor's subjective feeling of the pulse information, so the results of the pulse cutting diagnosis largely depend on the professional level and working status of the doctor, and are uncertain. In addition, when cutting the pulse, it is necessary to first find the three parts of the patient's cunning mouth, cunguan, and chi, which raises the requirements for the doctor's diagnostic level and reduces the diagnostic efficiency. Therefore, standardized instruments and equipment are needed to detect pulse information, thereby reducing the technical difficulty and misdiagnosis rate of TCM pulse cutting.

Piezoelectric sensors and piezoresistive sensors are two types of pulse sensors that are widely used at present. Piezoelectric sensor uses the piezoelectric material in it to generate electric charge on the surface due to the piezoelectric effect, so as to convert the stress into an electrical signal output to realize the sensing of stress. The resistivity of the piezoresistive material in the piezoresistive sensor will change due to the piezoresistive effect under the action of the strain gauge that is deformed by force, thereby affecting the magnitude of the output electrical signal and realizing the sensing of stress.

Piezoelectric sensors and piezoresistive sensors can reduce the technical difficulty and misdiagnosis rate of pulse cutting to a certain extent, but there are still limitations in practical use. The output DC response of the piezoelectric sensor is poor, and the charge is easy to escape, which makes it difficult to perform static measurement, resulting in insufficient sensitivity when detecting weak pulse conditions; the piezoresistive material and the pressure change sheet in the piezoresistive sensor are adhered by the emulsion. However, the creep, mechanical hysteresis and nonlinearity of emulsions limit the accuracy, sensitivity and linearity of piezoresistive sensors. In addition, these two types of sensors still need to manually find the positions of the three parts of the Cunguan Chi before detection, and only detect the pulse condition at these three points, which cannot reflect the pulse condition information of the entire Cunkou.

SUMMARY OF THE INVENTION

Aiming at the defects and improvement needs of the prior art, the present invention provides a pulse-cutting sensor and a pulse condition measuring device based on a directional coupler, which aims to solve the problems of low sensitivity, insufficient information collection and manual dependence of the existing pulse condition sensor. .

In order to achieve the above object, according to the first aspect of the present invention, a pulse cutting sensor based on a directional coupler is provided, comprising: an elastic film and an array of pulse sensing units embedded in the elastic film;

In the pulse sensing unit array, each pulse sensing unit includes a 1×2 directional coupler, a first photodetector and a second photodetector, and the first photodetector and the second photodetector are 1×2 directional respectively. The two output ends of the coupler are connected to detect the output light intensity of the two output ends of the 1×2 directional coupler and convert them into electrical signals; the input end of the 1×2 directional coupler is used as the input end of the pulse sensing unit , the output end of the first photodetector is used as the second output end of the pulse sensing unit, and the output end of the second photodetector is used as the second output end of the pulse sensing unit;

When working, the input laser is input through the input end of the pulse sensing unit, and the elastic film is attached to the pulse of the radial artery at the back of the wrist. When there is a pulse, the elastic film will deform due to the force, so that the pulse sensing The electrical signal output by the two output terminals of the unit changes, so as to realize the sensing of the pulse.

Further, the material of the elastic film is a flexible material with a small elastic modulus, harmless to the human body, and insulation, and its refractive index is lower than the refractive index of the input waveguide and the coupling waveguide of the 1×2 directional coupler in the pulse sensing unit, In order to achieve accurate and safe pulse sensing; preferably, the elastic film is a polydimethylsiloxane film.

Further, the area of the elastic film is larger than the area of the posterior wrist radial artery pulse, so as to ensure that the pulse information at the posterior wrist radial artery pulse can be obtained completely.

Further, both the first photodetector and the second photodetector are p-i-n germanium detectors.

According to the second aspect of the present invention, there is provided a pulse condition measurement device based on the directional coupler-based pulse cutting sensor provided in the first aspect of the present invention, comprising: a laser array, an optical power divider array, a pulse cutting sensor and an A/D conversion circuit;

The optical power splitter array is integrated with the laser array. The input end of each optical power splitter in the optical power splitter array is respectively connected with the output end of one laser in the laser array. The output ends are respectively connected with the input ends of one pulse sensing unit; the optical power divider is used to divide one laser output from the laser into n lasers, and then input them to the n pulse sensing units respectively;

The output terminals of all pulse sensing units are connected with the input terminals of the A/D conversion circuit, and the A/D conversion circuit is used to convert the electrical signals output by each pulse sensing unit into digital signals;

Wherein, the pulse cutting sensor is the pulse condition measuring device based on the directional coupler pulse cutting sensor provided in the first aspect of the present invention, and the optical power splitter has a light splitting ratio of 1:n.

Further, the pulse condition measuring device provided by the second aspect of the present invention further includes a laser control circuit;

The laser control circuit is connected to each laser in the laser array, and is used to control the switch and power of the lasers in the laser array, so as to flexibly adjust according to the spatial resolution requirements of the actual measurement and the pulse intensity of the measured object.

Further, the pulse condition measuring device provided by the second aspect of the present invention further comprises a retractable wristband, and both ends of the retractable wristband are provided with fixed components;

The laser array, optical power divider array, pulse cutting sensor and A/D conversion circuit are all fixed in the middle of the retractable wristband;

When working, the retractable wristband is worn on the wrist of the tested object, and its two ends are fixed together by fixing parts, so that the pulse cutting sensor is evenly and tightly attached to the radial artery pulse at the back of the wrist.

Further, the retractable wristband has good contractility to ensure that the pulse sensor can be evenly and tightly attached to the pulse of the radial artery at the back of the wrist, so that the pulse sensor can sense the force changes at various positions in the sensing area and accurately detect the pulse condition. Information; as a further preference, the retractable bracer is a compression nylon bracer.

Further, the fixing components at both ends of the retractable wristband are Velcro, and the hook surface and the rough surface of the Velcro are respectively located at the two ends of the retractable wristband, and are respectively located on the front and back sides.

In general, through the above technical solutions conceived by the present invention, the following beneficial effects can be achieved:

(1) The pulse cutting sensor and the pulse condition measuring device based on the directional coupler provided by the present invention are composed of the elastic film and the pulse sensing unit array embedded in the elastic film to complete the pulse sensing at each position of the radial artery pulse at the back of the wrist. The sensitivity of the directional coupler in the film and the pulse sensing unit is high, therefore, the sensing sensitivity of the present invention is high, the precise position of the three parts of the cunguan and the ruler need not be manually positioned, and the two-dimensional pulse of the entire radial artery can be obtained. information. In general, the present invention can effectively solve the problems of low sensitivity, insufficient collected information and dependence on manual labor of the existing pulse condition sensor.

(2) In the pulse cutting sensor and pulse condition measuring device based on the directional coupler provided by the present invention, since the volume of the directional coupler is small, the volume of the pulse sensing unit is correspondingly small, and the number of units in the pulse sensing unit array is also small. There can be many settings, so the present invention can achieve high spatial resolution.

Description of drawings

1 is a schematic diagram of a pulse condition measuring device provided by an embodiment of the present invention;

2 is a schematic diagram of a pulse sensing unit based on a directional coupler provided by an embodiment of the present invention;

Throughout the drawings, the same reference numbers are used to refer to the same elements or structures, wherein:

1- Compression nylon wristband, 2- Velcro wool surface, 3- Velcro hook surface, 4- Silica substrate, 5- Electroluminescent germanium-silicon laser, 6- Optical power splitter , 7—laser control circuit, 8—laser control circuit power socket, 9—polydimethylsiloxane film, 10—pulse sensing unit, 11—A/D conversion circuit, 12—A /D conversion circuit power socket, 13——A/D conversion circuit signal output port, 14——input waveguide, 15——coupled waveguide, 16——input waveguide p-i-n germanium detector, 17——coupled waveguide p-i-n germanium detector , 18—positive electrode of input waveguide p-i-n germanium detector, 19—negative electrode of input waveguide p-i-n germanium detector, 20—positive electrode of coupled waveguide p-i-n germanium detector, 21—coupled waveguide p-i-n germanium detector negative electrode.

Detailed ways

In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

The terms "first", "second" and the like (if present) in this disclosure and the accompanying drawings are used to distinguish similar objects and are not necessarily used to describe a particular order or sequence.

In order to solve the problems of low sensitivity, insufficient information collection and artificial dependence of the existing pulse sensor, the directional coupler-based pulse sensor provided by the present invention, as shown in FIG. 1, includes: an elastic film and a pulse embedded in the elastic film array of sensing units;

The material of the elastic film is a flexible material with a small elastic modulus, harmless to the human body, and insulation, and its refractive index is lower than the refractive index of the input waveguide and coupling waveguide of the 1×2 directional coupler in the pulse sensing unit, so as to achieve accurate , safe pulse sensing; in this embodiment, the elastic film is a polydimethylsiloxane (PDMS) film 9; the area of the elastic film is larger than the area of the radial artery at the back of the wrist to ensure complete acquisition of Pulse information at the pulse of the radial artery behind the wrist;

In the pulse sensing unit array, the structure of each pulse sensing unit 10 is shown in FIG. 2 , including a 1×2 directional coupler, a first photodetector and a second photodetector; as shown in FIG. 2 , 1×2 2. The directional coupler includes an input waveguide 14 and a coupling waveguide 15. The input end of the input waveguide 14 is the input end of the 1×2 directional coupler, and the output ends of the input waveguide 14 and the coupling waveguide 15 are two 1×2 directional couplers. At the output end, there is a part of the parallel coupling region between the input waveguide 14 and the coupling waveguide 15, in this coupling region, the input light will be alternately coupled and transmitted between the two waveguides; in this embodiment, the first photodetector is the input waveguide The p-i-n germanium detector 16, the second photodetector is a coupled waveguide p-i-n germanium detector 17, the positive electrode 18 of the input waveguide p-i-n germanium detector 16 and the negative electrode 19 of the input waveguide p-i-n germanium detector 16 together constitute the input waveguide p-i-n germanium detector The output end of the detector 16, the positive electrode 20 of the coupled waveguide p-i-n germanium detector 17 and the negative electrode 21 of the coupled waveguide p-i-n germanium detector 17 together constitute the output end of the coupled waveguide p-i-n germanium detector 17; the input waveguide p-i-n germanium detector 16 and the The output end of the input waveguide 14 is connected, and the coupled waveguide p-i-n germanium detector 17 is connected to the output end of the coupled waveguide 15. The input waveguide p-i-n germanium detector 16 and the coupled waveguide p-i-n germanium detector 17 are respectively used to detect two 1×2 directional couplers. The output light intensity of each output terminal is converted into an electrical signal; the input terminal of the 1×2 directional coupler is used as the input terminal of the pulse sensing unit, and the output terminal of the input waveguide p-i-n germanium detector 16 is used as the second output terminal of the pulse sensing unit. , the output end of the coupled waveguide p-i-n germanium detector 17 is used as the second output end of the pulse sensing unit;

When working, the input laser is input through the input end of the pulse sensing unit, and the elastic film is attached to the pulse of the radial artery at the back of the wrist. In the coupling area of the 1×2 directional coupler in the unit, the distance between the input waveguide 14 and the coupling waveguide 15 will change, which will eventually affect the light intensity at the two output ends of the 1×2 directional coupler. The electrical signal obtained by the conversion of the output light intensity will also change, so as to realize the sensing of the pulse.

In order to facilitate the implementation, when the above-mentioned directional coupler-based pulse cutting sensor works, the wavelength of the input laser can be selected as 1550nm, which is a commercial standard communication band, and there are already mature directional couplers, lasers, optical Optical devices such as power dividers and photodetectors.

It should be understood that, in order to facilitate the explanation of the structure and implementation principle of the above-mentioned pulse cutting sensor, Fig. 1 only shows part of the sensing units in the pulse sensing unit array, "." indicates the omitted part, and its spatial resolution and The measurement area depends on the number of pulse sensing units.

As shown in FIG. 1, based on the above-mentioned pulse cutting sensor, the pulse condition measuring device provided by the present invention includes: a retractable wristband, a laser control circuit 7, a laser array, an optical power divider array, a pulse cutting sensor and an A/D conversion circuit 11;

Wherein, the pulse-cutting sensor is the above-mentioned directional coupler-based pulse-cutting sensor;

The optical power splitter array and the laser array are integrated on the silicon dioxide substrate 4, the input end of each optical power splitter 6 in the optical power splitter array is respectively connected with the output end of a laser in the laser array, and each One output end of an optical power splitter is respectively connected with the input end of a pulse sensing unit; the splitting ratio of the optical power splitter is 1:n, and the optical power splitter is used to divide one laser output from the laser into n lasers Then, they are respectively input to n pulse sensing units; in this embodiment, the lasers in the laser array are electroluminescent germanium-silicon lasers 5;

The output terminals of all pulse sensing units 10 are connected to the input terminals of the A/D conversion circuit 11, and the A/D conversion circuit 11 is used to convert the electrical signals output by each pulse sensing unit 10 into digital signals; A/D The signal output port 13 of the conversion circuit 11 can be connected with a computer to output digital signals;

The laser control circuit 7 is connected to each electroluminescent germanium-silicon laser 5 in the laser array, and is used to control the switch and power of the lasers in the laser array, so as to flexibly perform the operation according to the spatial resolution requirements of the actual measurement and the pulse intensity of the measured object. Adjustment;

The retractable wristband has good contractility to ensure that the pulse sensor can be evenly and tightly attached to the pulse of the radial artery at the back of the wrist, so that the pulse sensor can sense the force changes at various positions in the sensing area and accurately detect the pulse information; In this embodiment, the retractable wristband is a compressed nylon wristband 1; the laser array, the optical power splitter array, the pulse cutting sensor and the A/D conversion circuit 11 are all fixed in the middle of the compressed nylon wristband 1;

A laser control circuit power socket 8 and an A/D conversion circuit power socket 12 are also provided on the compressed nylon wristband 1 to supply power to the laser control circuit 7 and the A/D conversion circuit 11 respectively;

Velcro is provided at both ends of the compressed nylon wristband 1 as a fixed part, and the Velcro wool surface 2 and the Velcro hook surface 3 are respectively located at both ends of the compressed nylon wristband 1, and are respectively located on the front and back sides. Together with the Compression Nylon Bracer 1, it forms an elastic and adjustable wristband;

When working, the retractable wristband is worn on the wrist of the tested object, and its two ends are fixed together by Velcro, so that the pulse sensor can be evenly and tightly attached to the radial artery pulse at the back of the wrist.

The above-mentioned pulse cutting sensor and pulse condition measuring device are composed of the elastic film and the pulse sensing unit array embedded in the elastic film to complete the pulse sensing at each position of the radial artery pulse at the back of the wrist, and the elastic film and the directional coupler in the pulse sensing unit are connected. High sensitivity, therefore, the above-mentioned pulse cutting sensor and pulse condition measuring device have high sensing sensitivity, do not need to manually locate the accurate position of the three parts of the cunguan and chi, and can obtain the two-dimensional pulse information of the entire radial artery pulse, which can effectively solve the existing problems. The pulse sensor has the problems of low sensitivity, insufficient collected information and manual labor.

Those skilled in the art can easily understand that the above are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention, etc., All should be included within the protection scope of the present invention.

Claims (9)

1. A pulse cutting sensor based on a directional coupler, characterized in that, comprising: an elastic film and an array of pulse sensing units embedded in the elastic film; In the pulse sensing unit array, each pulse sensing unit includes a 1×2 directional coupler, a first photodetector and a second photodetector, the first photodetector and the second photodetector are respectively connected with the two output ends of the 1×2 directional coupler, respectively used to detect the output light intensity of the two output ends of the 1×2 directional coupler and convert them into electrical signals; the 1×2 directional coupler The input terminal of the sensor is used as the input terminal of the pulse sensing unit, the output terminal of the first photodetector is used as the second output terminal of the pulse sensing unit, and the output terminal of the second photodetector is used as the output terminal of the pulse sensor unit. the second output end of the pulse sensing unit; When working, the input laser is input through the input end of the pulse sensing unit, and the elastic film is attached to the pulse of the radial artery behind the wrist. When there is a pulse, the elastic film will be deformed due to the force, so that the corresponding position The electrical signal output by the two output terminals of the pulse sensing unit changes, so as to realize the sensing of the pulse. 2 . The directional coupler-based pulse cutting sensor according to claim 1 , wherein the elastic film is a polydimethylsiloxane film. 3 . 3 . The directional coupler-based pulse cutting sensor according to claim 1 or 2 , wherein the area of the elastic film is larger than the area where the radial artery pulses behind the wrist. 4 . 4. The directional coupler-based pulse cutting sensor according to claim 1 or 2, wherein the first photodetector and the second photodetector are both p-i-n germanium detectors. 5. A pulse condition measuring device based on the directional coupler-based pulse-cutting sensor according to any one of claims 1-4, characterized in that, comprising: a laser array, an optical power divider array, a pulse-cutting sensor and an A/D conversion circuit; The optical power splitter array is integrated with the laser array, and the input end of each optical power splitter in the optical power splitter array is respectively connected with the output end of a laser in the laser array, One output end of each optical power divider is respectively connected with the input end of one pulse sensing unit; the optical power divider is used to divide one laser output from the laser into n lasers, and then input them to n lasers respectively. Pulse sensing unit; The output ends of all pulse sensing units are connected with the input ends of the A/D conversion circuit, and the A/D conversion circuit is used to convert the electrical signals output by each pulse sensing unit into digital signals; Wherein, the pulse cutting sensor is the pulse condition measuring device based on the directional coupler cutting pulse sensor according to any one of claims 1-4, and the light splitting ratio of the optical power splitter is 1:n. 6. The pulse condition measuring device according to claim 5, further comprising a laser control circuit; The laser control circuit is connected to each laser in the laser array, and is used to control the switch and power of the lasers in the laser array. 7. The pulse condition measuring device according to claim 5 or 6, characterized in that, further comprising a retractable wristband, and both ends of the retractable wristband are provided with fixed parts; The laser array, the optical power divider array, the pulse cutting sensor and the A/D conversion circuit are all fixed in the middle of the retractable wristband; During operation, the retractable wristband is worn on the wrist of the object to be tested, and the two ends thereof are fixed together by the fixing member, so that the pulse cutting sensor is evenly and tightly attached to the pulse of the radial artery at the back of the wrist. 8 . The pulse condition measuring device according to claim 7 , wherein the retractable wristband is a compressed nylon wristband. 9 . 9 . The pulse condition measuring device according to claim 7 , wherein the fixing parts at both ends of the retractable wristband are Velcro, and the hook surface and the rough surface of the Velcro are respectively located at the two ends of the retractable wristband. 10 . , and are located on the positive and negative sides, respectively.

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