CN204581258U

CN204581258U - A kind of infrared sphygomanometer based on FPGA

Info

Publication number: CN204581258U
Application number: CN201520284369.XU
Authority: CN
Inventors: 吕晓兰; 崔得龙
Original assignee: Guangdong University of Petrochemical Technology
Current assignee: Guangdong University of Petrochemical Technology
Priority date: 2015-05-05
Filing date: 2015-05-05
Publication date: 2015-08-26
Anticipated expiration: 2025-05-05

Abstract

This utility model relates to a kind of infrared sphygomanometer based on FPGA, FPGA main controller, infrared transmitter, photoelectric detector, signal condition unit, input-output unit, communication unit and power supply unit, the function that FPGA main controller periphery connects infrared transmitter, signal condition unit, input-output unit, communication unit realize infrared signal emission control respectively, Received signal strength conditioning, I/O management, control communicate with other-end, photoelectric detector is connected with signal condition unit the front end receiver function for realizing infrared signal.This utility model detects the different wave shape of echo to ultrared different absorbing state according to hemoglobin during blood flow, the size of pressure value is calculated according to difference value, adopt FPGA as main controller simultaneously, make full use of the feature of its concurrent operation, process multiple signals data simultaneously, reach simultaneously to the object that the blood pressure of multiple people is measured, have without the need to contact, easy to use, measure precisely, feature that volume is light and handy.

Description

A kind of infrared sphygomanometer based on FPGA

Technical field

This utility model belongs to sphygomanometer field, particularly relates to a kind of infrared sphygomanometer based on FPGA.

Background technology

Existing sphygomanometer, no matter be mechanical type or electronic type, basic employing contact method is measured, and by wrist strap or arm straps are tied to wrist or arm place, sends into air to wrist strap or arm straps, pressurize gradually, block after the circulation of arterial blood and gradually air discharged, when being discharged to certain pressure blood flow start to recover flowing then pressure be now maximal blood pressure, further discharge the pressure in arm straps, when blood vessel returns to normal condition, pressure is now minimal blood pressure.This kind of metering system, because need wrist strap or arm straps to be tied to wrist or arm place, so the comparatively responsive gauger of Some Constitution can be made to occur physiology sense of discomfort in measured place, thus the accuracy that impact is measured, in addition this method can only measure the blood pressure in quiet situation, and blood pressure when can not measure motion, therefore there is certain limitation.

Summary of the invention

This utility model for existing issue, provide a kind of without the need to contact, easy to use, measure precisely, the infrared sphygomanometer based on FPGA that volume is light and handy.

For solving the problem, this utility model adopts following technical scheme:

A kind of infrared sphygomanometer based on FPGA, comprise FPGA main controller, infrared transmitter, photoelectric detector, signal condition unit, input-output unit, communication unit and power supply unit, FPGA main controller periphery connects infrared transmitter, signal condition unit, input-output unit, communication unit realizes infrared signal emission control respectively, Received signal strength is nursed one's health, I/O management, control the function communicated with other-end, photoelectric detector is connected with signal condition unit the front end receiver function for realizing infrared signal, power supply unit connects each module for being each module for power supply.

Described signal condition unit comprises amplifying circuit, filter circuit and secondary amplifying circuit and is respectively used to realize the function that the amplification of Received signal strength, filtering and secondary amplify.

Described input-output unit comprises keyboard and display screen is respectively used to realize the function that user inputs and measurement result shows.

Described communication unit comprises bluetooth communication circuit and usb communication circuit is respectively used to realize Bluetooth wireless communication and USB wired communication functions.

The beneficial effects of the utility model are:

1, skin is irradiated by near infrared ray, according to hemoglobin during blood flow, ultrared absorbing state is detected to the difference of reflection configuration, pressure value is calculated by difference value, avoid existing contact measurement method, the gauger of various body constitution can be adapted to preferably, and pressure value when can measure motion, can only to measure the sphygmomanometer function of blood pressure under rest state more perfect than existing;

2, using FPGA as main controller, give full play to the function of FPGA parallel processing, can process multiple signals simultaneously, can measure the blood pressure of multiple gauger simultaneously, change the situation that existing sphygomanometer once can only be measured single gauger.

Accompanying drawing explanation

Fig. 1 is overall structure figure of the present utility model.

Fig. 2 is the structure chart of this utility model signal condition unit.

Fig. 3 is the circuit diagram of this utility model amplifying circuit.

Fig. 4 is the circuit diagram of this utility model filter circuit.

Fig. 5 is the circuit diagram of this utility model secondary amplifying circuit.

Detailed description of the invention

Below in conjunction with specific embodiment, this utility model is further described:

As shown in Figure 1, a kind of infrared sphygomanometer based on FPGA, comprise FPGA main controller (1), infrared transmitter (2), photoelectric detector (3), signal condition unit (4), input-output unit (5), communication unit (6) and power supply unit (7), FPGA main controller (1) periphery connects infrared transmitter (2), signal condition unit (4), input-output unit (5), communication unit (6) realizes infrared signal emission control respectively, Received signal strength is nursed one's health, I/O management, control the function communicated with other-end, the front end receiver function that photoelectric detector (3) is connected for realizing infrared signal with signal condition unit (4), power supply unit (7) connects each module for being each module for power supply.

In practical work process, FPGA main controller (1) produces pumping signal and controls the infrared ray that certain wavelength launched by infrared transmitter (2), adopt the near-infrared of 200KHz herein, when meeting after infrared ray is irradiated to skin is by the hemoglobin absorption in blood, because blood flow changes along with blood pressure variation, the waveform of echo also can change, echo is received by photoelectric detector (3), and echo is delivered in signal condition unit (4) and amplify, filtering, deliver in FPGA main controller (1) after secondary processing and amplifying, FPGA main controller is by analyzing not waveform in the same time, calculate the time difference and wave-amplitude size that form crest, thus calculate pressure value, and measurement result is delivered to input-output unit (5) and show, also measurement result can be uploaded in other terminals connected by communication unit (6) simultaneously and carry out subsequent treatment.

As shown in Figure 2, described signal condition unit (4) comprises amplifying circuit (8), filter circuit (9) and secondary amplifying circuit (10) and is respectively used to realize the function that the amplification of Received signal strength, filtering and secondary amplify.

As shown in Figure 3, in described amplifying circuit (8), after the signal of photoelectric detector (3) is received by D1, deliver in the middle of VT1 after the biased filter network be made up of R1, C1, R2, after VT1 amplifies, again through R5 to deliver in the middle of VT2 amplify further after pass out in the filter circuit (9) of next stage by A point, B, C point is powered for connecting power supply unit (7) for circuit, VD _zstabilivolt is for ensureing that input supply voltage is no more than rated value.

As shown in Figure 4, in described filter circuit (9), the output signal of frontend amplifying circuit (8) inputs through D point, after the first-level filtering wave network formed via R9, C4, secondary filter network that L1, C5 are formed and the filtering of three grades of filter networks that is made up of C6, L2, R10, send in the secondary amplifying circuit (10) of rear stage through E point.

As shown in Figure 5, described secondary amplifying circuit (10), the output signal of front-end filtering circuitry (9) inputs through F place, deliver in the middle of T1 after the biasing circuit that R11 and R12 is formed and amplify, signal after amplification continues to deliver in T2 and amplifies, export FPGA main controller (1) to from H after amplifying the filter network filtering that the signal that exports forms via R15 and C7, G point is powered for connecting power supply unit (7) for whole circuit.

The above is only preferred embodiment of the present utility model, therefore all equivalences done according to structure, feature and the principle described in this utility model patent claim change or modify, and are included in this utility model patent claim.

Claims

1. the infrared sphygomanometer based on FPGA, comprise FPGA main controller, infrared transmitter, photoelectric detector, signal condition unit, input-output unit, communication unit and power supply unit, FPGA main controller periphery connects infrared transmitter, signal condition unit, input-output unit, communication unit realizes infrared signal emission control respectively, Received signal strength is nursed one's health, I/O management, control the function communicated with other-end, photoelectric detector is connected with signal condition unit the front end receiver function for realizing infrared signal, power supply unit connects each module for being each module for power supply.

2. according to a kind of infrared sphygomanometer based on FPGA described in claim 1, it is characterized in that: described signal condition unit comprises amplifying circuit, filter circuit and secondary amplifying circuit and is respectively used to realize the function that the amplification of Received signal strength, filtering and secondary amplify.

3. according to a kind of infrared sphygomanometer based on FPGA described in claim 1, it is characterized in that: described input-output unit comprises keyboard and display screen is respectively used to realize the function that user inputs and measurement result shows.

4. according to a kind of infrared sphygomanometer based on FPGA described in claim 1, it is characterized in that: described communication unit comprises bluetooth communication circuit and usb communication circuit is respectively used to realize Bluetooth wireless communication and USB wired communication functions.