CN201130059Y

CN201130059Y - Infrared temperature measuring system

Info

Publication number: CN201130059Y
Application number: CNU2007200608563U
Authority: CN
Inventors: 区兴鹏; 陆伟强; 张灿辉
Original assignee: FOSHAN NANHAI DISTRICT INFORMATION TECHNOLOGY SCHOOL
Current assignee: FOSHAN NANHAI DISTRICT INFORMATION TECHNOLOGY SCHOOL
Priority date: 2007-12-04
Filing date: 2007-12-04
Publication date: 2008-10-08
Anticipated expiration: 2017-12-04

Abstract

The utility model discloses an infrared temperature measuring system, which comprises an infrared temperature sensor which can absorb infrared radiation emitted by objects and can convert into voltage signals, wherein the infrared temperature sensor is connected with an analog signal amplifying circuit module, a data collecting and processing module used for carrying out the analogue/digital conversion to signals in the analog signal amplifying circuit module, wherein the data which is from the data collecting and processing module is outputted through a liquid crystal display screen, and a key control module is further connected on the data collecting and processing module. The infrared temperature measuring system of the utility model is a noncontact infrared thermodetector, which can avoid contacting with patients to protect medical staff, and can rapidly read out the accurate temperature index, is beneficial for the diagnosis of diseases, and the system can also be widely applied for other fields, such as in the building industry and the manufacturing industry, the noncontact heat indicator is needed to protect workers in safety, and can obtain the manufacturing temperature index in the shortest time, and improves the economic benefit.

Description

A kind of infrared thermography system

Technical field

The utility model relates to a kind of temperature measurement system, especially a kind of temperature measurement system of using infrared technique measurement body temperature.

Background technology

The development of infrared eye is the guide of Development of Infrared Technique.Be developed into the thermosensitive type infrared eye in 1940 in the past.The 1950's, the developing rapidly of semiconductor physics advanced the development of photoelectric type infrared eye.The sixties, the appearance of laser greatly influenced Development of Infrared Technology.A lot of important laser are all at infrared band, and its coherence is convenient to divert from one use to another the heterodyne reception technology in the electronic technology.Infrared technique is used widely in military and national economy all departments.For example, infrared technique militarily can be used for target detection, communication and night vision, can be used for thermal source detection, temperature survey and process control, Infrared spectroscopy, Infrared Heating drying, infrared remote sensing, infrared astronomy etc. aspect industry, medical science and the scientific research.Since infrared eye military and civilian aspect all occupy crucial status, and room temperature infrared detector enjoys favor because of its cheap cost, higher reliability and simple manufacture craft, has become the focus of the various countries military and each major company research at present.

Traditional temperature taking meter is that thermometer is contacted with the human body skin surface, has the inaccurate shortcoming of measurement, and temperature data is read from the scale of thermometer, because the visual deviation of people, the problem that this has increased read untrue again adds that traditional thermometer must contact with human body, to having communicable patient when carrying out the monitoring of life index parameter, the medical personnel uses the temperature measurer of this contact to receive infection easily, jeopardizes ill personnel and medical worker's health of human body.

Summary of the invention

The purpose of this utility model provides a kind of contactless temperature measurement system, produces inconvenient technical matters to solve prior art because thermometer contacts with human body.

For reaching above purpose, the utility model has been taked following technical scheme: a kind of infrared thermography system, comprise the infrared temperature sensor that the infrared radiation of object emission can be absorbed and is converted into voltage signal, described infrared temperature sensor is connected with the amplifying circuit of analog signal module, signal in the amplifying circuit of analog signal module is carried out the data acquisition and processing (DAP) module of digital-to-analog conversion, the data that obtain in the described data acquisition and processing (DAP) module are exported by LCDs, also are connected with the button control module on described data acquisition and processing (DAP) module.

The utility model infrared thermography system is based on blackbody radiation law, and black matrix is the emittance that it(?) can both whole absorptions under any temperature projects any wavelength on its surface, both not reflections, and electricity does not have the object of transmission.It is also to extraneous emittance simultaneously, and the monochromatic radiation out-degree of black matrix is to be described in the radiation flux that sends on the unit area of a certain wavelength radiation source.Change into voltage signal again by the infrared radiation absorption of using infrared temperature sensor that object is launched, realize the transformation of temperature to electric current, amplification, analog to digital conversion are handled the output temperature value by MCU more then.Native system is a measurement of bldy temperature system portable, low-power consumption, and the temperature value that records is presented at real-time displays temperature and the record of energy on the liquid crystal display, and convenient control comes into plain view test result.

Native system can be divided into following functional module: (1) human surface temperature's non-contact measurement function; (2) enlarging function of measure analog signals; (3) data acquisition and processing (DAP) function; (4) take temperature value Presentation Function; (5) button control function system adopts electrification reset, and the design button does not reset separately.

According to each function of system of dividing, the hardware of system mainly comprises following a few major part: (1) infrared temperature sensor, (2) amplifying circuit, (3) data acquisition and processing (DAP), (4) liquid-crystal display section, (5) by key control, native system adopts infrared temperature sensor SC0067 as temp probe.

The thermistor that is used for temperature compensation is housed in the infrared temperature sensor.This sensor has the output of two-way voltage signal, and one the tunnel is the voltage signal output of target temperature and environment temperature difference, i.e. thermoelectric pile output; One the tunnel is the output of thermosensitive resistance measurement environment temperature voltage.

Amplifying circuit is primarily aimed at the mV magnitude voltage signals of thermoelectric pile output, and the ADC that it is amplified to about 3V imports requirement.Therefore, amplifying circuit needs 2500 times amplifying power.Amplifying circuit is that two-stage is amplified, and the first order is formed 969.6 times of amplifications by amplifier AD620; The second level is amplified 2.55 times by amplifier LM358 proportion of composing amplifying circuit.

Signals collecting and processing module, sensor can be sent among the ADC that single-chip microcomputer carries through the voltage signal that amplifies and carry out the AD conversion, and single-chip microcomputer takes out transformation result again and carries out various data processing then.

Button control module, native system have only two buttons, s1 (beginning to measure key) and s2 (memory button).Button is pressed the back circuit and is connected, and decontrols the back circuit and disconnects.On each port pull-up resistor is arranged, when not having button to press, P3.3, P3.4 are input as high level, and when button was pressed, the corresponding ports input transferred low level to.It is low level that the Keyboard Control program detects certain port, and through after eliminating shake, just can determine that the button of port connection is pressed therewith, and calling program is carried out function corresponding then.

The The software idea of modular of native system.Each module according to hardware design is divided into a plurality of program modules with software according to different functions.Each module designs respectively, programmes, debugs, and by master routine and function call each program module is coupled together at last.Include temperature-measuring module, LCD MODULE, key-press module.

The program of temperature survey part comprises: (1) sensor heat outputting pile voltage signal algorithm design; (2) sensor output environment temperature-compensated voltage algorithm design; (3) the each measurement gathered 4 temperature datas, averages, at last with temperature gap and environment temperature addition.

It is that root pick Planck principle is carried out thermometric that sensor heat outputting pile voltage signal algorithm is established juice principle upper sensor, but for what use convenient and actual measurement is the infrared radiation of certain wavelength, and the body temperature scope has only 34 ℃-42 ℃, for the output of sensor, can regard the relation of the output and the temperature difference as linear in the so a bit of scope.Confirmable is that the thermoelectric pile output voltage and the temperature difference are one-to-one relationships.Sensor output environment temperature-compensated voltage algorithm design sensor is to use the negative tempperature coefficient thermistor of a 100K (25 ℃) of its inside to realize ambient temperature compensation.As long as measure the resistance of thermistor, just can learn corresponding environment temperature.Because temperature indoor during take temperature is generally at 20 ℃-32 ℃.

The utility model compared with prior art; have following technique effect: physiological parameter is most important, the most basic life index of human body; the monitoring that the urgent patient is carried out the life index parameter is one of medical personnel's important means of in time understanding state of an illness situation; use the Non-contact Infrared Temperature Measurement instrument can avoid contacting with the protection medical worker with ill personnel; and can read temperature index accurately as early as possible, help the diagnosis of the state of an illness.Infrared thermometer also has widely at other field to be used, as under some rugged surroundings in order to guarantee the thermometer of this noncontact class of staff's security needs, in building trade and the manufacturing industry, often need to obtain as soon as possible producing temperature index, at this time just need to finish in a short period of time the measurement of temperature, increase the benefit.

Description of drawings

Fig. 1 is an infrared thermography system chart of the present utility model;

Fig. 2 is the utility model button control module circuit connection diagram;

Fig. 3 is the utility model amplifying circuit of analog signal modular circuit synoptic diagram;

Description of reference numerals: 1, infrared temperature sensor, 2, the amplifying circuit of analog signal module, 3, the number pick gathers and processing module, 4, LCDs, 5, the button control module.

Embodiment

Below in conjunction with the drawings and the specific embodiments the utility model is described further:

Please participate in Fig. 1 to shown in Figure 3, a kind of infrared thermography system, comprise the infrared radiation of object emission can be absorbed and is converted into voltage signal infrared temperature sensor 1, described infrared temperature sensor 1 is connected with amplifying circuit of analog signal module 2, signal in the amplifying circuit of analog signal module 2 is carried out the data acquisition and processing (DAP) module 3 of digital-to-analog conversion, the data that obtain in the described data acquisition and processing (DAP) module 3 also are connected with button control module 5 by LCDs 4 outputs on described data acquisition and processing (DAP) module 3.

Be provided with the thermistor that is used for temperature compensation in the described infrared temperature sensor 1.Described amplifying circuit of analog signal module 2 is made up of two-stage amplifier.

Power on laggardly to go into master routine and wait for that button presses in system, if what button control module 5 was pressed is the s1 key, infrared temperature sensor is put into the general 2-3 of the duct time of second, wait for that the clinical thermometer measurement finishes, the body temperature value of measuring will be presented on the LCDs.And if what press is the s2 key, then can show on the liquid crystal display the last body temperature value of measuring, by that analogy, can show 5 historical record body temperature values altogether continuously again by once then showing the body temperature value that recorded last last time.But, measure if after pressing the s2 key, supress the s1 key again, then writing function zero clearing, record body temperature value begins to show that the rest may be inferred from nearest measurement result again.

The utility model adopts the STC89LE516AD single-chip microcomputer.This single-chip microcomputer is compatibility 8051 fully, and operating voltage is 3V, carries 8 accuracy A D conversions.AD transformation result=256 * Vin/Vcc, Vin is the analog input channel input voltage, Vcc is a single-chip microcomputer real work voltage, with the analog reference voltage of single-chip microcomputer operating voltage as ADC.

Liquid crystal display LCDs in the infrared thermography system is selected FM0802A ocra font ocr dot matrix LCD for use, and character size is 5 * 8, and whole liquid crystal display has two composing symbols, and every row can show 8 words.

Claims

1, a kind of infrared thermography system is characterized in that: comprise the infrared temperature sensor (1) that the infrared radiation of object emission can be absorbed and is converted into voltage signal, described infrared temperature sensor (1) is connected with amplifying circuit of analog signal module (2); Signal in the amplifying circuit of analog signal module (2) is carried out the data acquisition and processing (DAP) module (3) of digital-to-analog conversion, the data that obtain in the described data acquisition and processing (DAP) module (3) also are connected with button control module (5) by LCDs (4) output on described data acquisition and processing (DAP) module (3).

2, infrared thermography according to claim 1 system is characterized in that: be provided with the thermistor that is used for temperature compensation in described infrared temperature sensor (1).

3, infrared thermography according to claim 1 system, it is characterized in that: described amplifying circuit of analog signal module (2) is made up of two-stage amplifier.