Handheld Infrared Thermometer
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To introduce handheld infrared thermometer knowledge and recommend one solution for it.
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Handheld Infrared Thermometer
- 8. Infrared Temperature Sensors Selection Guide Manufacturer Part Number Description Accuracy Field of View Response Time Temp Range Sensor Output CALEX PC151mT-0 Infrared Temperature Sensor ±1% 15:1 240ms – 0 to +250°C 4-20mA CALEX PC21MT-0 Infrared Temperature Sensor ±1% 2:1 240ms – 0 to +250°C 4-20mA CALEX PE151MT-0 Infrared Temperature Sensor ±1% 15:1 240ms – 0 to +250°C 4-20mA CALEX PE21MT-0 Infrared Temperature Sensor ±1% 2:1 240ms – 0 to +250°C 4-20mA PerkinElmer TPD 1T 0514 Single Element Thermopile Detector 0.03%/K 84º 35ms – 20 to +105°C R:25-70k Perkinelmer TPD 1T 0226 IRA Thermopile Detector 0.03%/K 15º 22ms – 20 to +100°C R:50-100k Perkinelmer TPM 1T 0234 M(y) Thermopile Sensor with Integrated Processing ±1.5K 7º 100ms – 25 to +100°C R:50k Perkinelmer TPL 08T 2146 L3.9 1 x 8 Element Thermopile Array ±1.5K 50º 250ms 0 to +60°C Perkinelmer TPA 16T 4146 L3.9 4x4 Element Linear Thermopile Array ±1.5K 49º 400ms 0 to +60°C Raytek Raytek CI noncontact infrared pyrometer 4:1 350ms – 0 to +500°C 0-5V Raytek Raytek GPR noncontact infrared pyrometer ±1% 30:1 18 to +538°C 0-5V Raytek Raytek GPS noncontact infrared pyrometer ±1% 50:1 18 to +538°C 0-5V GE ZTP-015 Thermometrics IR Sensor 20ms – 20 to +100°C R:100K GE ZTP-135SR Thermometrics IR Sensor 20ms – 20 to +100°C R:100K GE ZTP-25ASM Thermometrics IR Sensor 35ms – 20 to +150°C 0-5V GE ZTP-315D1 Thermometrics IR Sensor 24ms – 20 to +100°C R:50K
- 9. Precision Instrumentation Amplifier Selection Guide Supplier Part Number Description Offset Voltage Bias Current Noise CMRR TI INA333 Low-Power Precision Instrumentation Amplifier 20uV 200pA 50nV/ √ Hz 100dB TI OPA333 microPOWER CMOS Zero-Drift Series Amplifier 10μV ±70pA 1.1μV/ √ Hz 106dB TI INA321 Micropower single-supply CMOS Instrumentation Amplifier ±200μV 10pA 100 nV/ √ Hz 90dB TI INA118U Precision, Low Power Instrumentation Amplifier 50μV 5 nA 10 nV/ √ Hz 110dB TI INA129 Precision, Low Power Instrumentation Amplifiers 50μV 5 nA 10 nV/ √ Hz 120dB TI INA326 Precision, Rail-To-Rail I/O Instrumentation Amplifier 100μV 2 nA 33 nV/ √ Hz 100dB NS LMP7731 Low Noise, Precision , RRIO, Operational Amplifier 500 µV ±1.5 nA 3.3 nV/ √ Hz 105dB NS LMP2231 Low Noise, Precision , RRIO, Operational Amplifier 150 µV 20 fA 60 nV/ √ Hz 81dB NS LMP2015 Single, High Precision, RRIO, Operational Amplifier 50 µV N/A 35 nV/ √ Hz 100dB NS LMP7701 Precision, CMOS Input, RRIO, Wide Supply Range Amplifier 200 µV ±200 fA 9 nV/ √ Hz 88dB Maxim MAX4194 Micropower, Single-Supply, RRIO, Instrumentation Amplifiers 50μV 20nA 85 nV/ √ Hz 99dB Maxim MAX4195 Micropower, Single-Supply, RRIO, Instrumentation Amplifiers 50μV 20nA 85 nV/ √ Hz 99dB Maxim MAX4196 Micropower, Single-Supply, RRIO, Instrumentation Amplifiers 50μV 20nA 85 nV/ √ Hz 99dB Maxim MAX4208 Ultra-Low Offset/Drift, Instrumentation Amplifiers 20uV 1pA 140 nV/ √ Hz 135dB Maxim MAX4209 Ultra-Low Offset/Drift, Instrumentation Amplifiers 20uV 1pA 140 nV/ √ Hz 135dB ADI AD8099 Low Noise and Low Distortion Op-Amp N/A N/A 0.95nV/rtHz N/A ADI ADA4899 Unity-Gain Stable, Ultralow Distortion, High Speed Op Amp N/A N/A 1nV/rtHz N/A ADI ADA4841-1 Low Power, Low Noise and Distortion, RRIO Output Amplifier N/A N/A 2.1nV/rtHz N/A ADI AD8021 Low Noise, High Speed Amplifier for 16-Bit Systems N/A N/A 2.1nV/rtHz N/A ADI AD8538 Low Power, Precision, Auto-Zero Op Amp 13uV 25pA 50nV/ √ Hz 135dB
- 11. Low Power ADC Selection Guide Manufacturer Part Number Resolutions Sample Rate Power Consumption No. of Supplies Interface ADI AD7274 12-bit 3 MSPS 13.5mW 1 SPI ADI AD7276 12-bit 3 MSPS 13.5mW 1 SPI ADI AD7476 12-bit 1 MSPS 3.5mW 1 SPI ADI AD7683 16-bit 100 KSPS 4mW 1 SPI ADI AD7684 16-bit 100 KSPS 4mW 1 SPI TI ADS1113 16-bit 860SPS 0.36mW 1 I 2 C TI ADS1114 16-bit 860SPS 0.36mW 1 I 2 C TI ADS1115 16-bit 860SPS 0.36mW 1 I 2 C NS ADC121C021 12-bit 1 MSPS 0.78mW 1 I 2 C NS ADC121C027 12-bit 1 MSPS 0.78mW 1 I 2 C NS ADC121S101 12-bit 1 MSPS 10mW 1 SPI LTC LTC2355 12-bit 3.5MSPS 18mW 1 SPI LTC LTC2356 12-bit 3.5MSPS 18mW 1 SPI LTC LTC1403 12-bit 2.8MSPS 12mW 1 SPI
- 12. Low Power MCU Selection Guide Manufacturer Part Number Frequency (MHz) LCD Segments RAM (KB) Flash (KB) ADC (Bit) DAC (Bit) Power (Active Mode) Power (Standby Mode) Interface TI MSP430x4xx Series 8 Up to 160 0.256 to 8 4 to 120 Up to 16 12 <3.2 mA 1.1uA IIC/Uart/SPI Freescale S08LL Series 20 8*36 / 4*28 2 to 4 8 to 64 12 -- 0.5mA-5.7mA 0.25uA-6uA SPI/IIC/SCI Freescale S08LG Series Up to 40 4*41 / 8*37 2 18 to 32 12 -- 0.5mA-5.7mA 0.25uA-6uA SPI/IIC/SCI Freescale RS08LA Up to 10 8*21 / 4*25 0.256 8 10 -- < 3.71 mA < 1.37 mA SPI/SCI Freescale RS08LE Up to 10 8*14 / 4*18 0.256 4 10 -- 1mA - 20mA < 15uA SPI/SCI Maxim MAXQ2000 20 132 2 64 N/A N/A 190uA/MHz 700nA IIC/Uart/SPI Atmel ATMEGA3290P 20 4*40 2 32 10 69 420uA/MHz 40nA Uart/SPI Atmel ATMEGA169P 16 4*25 1 16 10 54 330uA/MHz 0.1uA Uart/SPI Cypress CY8C29x66 24 N/A 2 32 Up to 14 Up to 9 14mA 10uA IIC/Uart/SPI Cypress CY8C27x43 24 N/A 0.256 16 Up to 14 Up to 9 8mA 6.5uA IIC/Uart/SPI Cypress CY8C24x23A 24 N/A 0.256 4 Up to 14 Up to 9 8mA 6.5uA IIC/Uart/SPI
- 14. LCD Display Selection Guide Manufacturer Part Number Description No. of Digits / Alpha Supply Voltage Size (mm) Display Area (mm 2 ) POWERTIP CORP PC1602ARU-HWB-G-Q LCD MODULE, 16X2, X-TMP 32 5V 5.56 10 * 36 POWERTIP CORP PC2002LRS-AWA-B-Q LCD MODULE, 20X2 LED B/L 40 5V 5.55 18.6 * 85 POWERTIP CORP PC2402LRS-AWA-B-Q LCD MODULE, 24X2, LED B/L 48 5V 5.55 15.8 * 93.5 Batron BTHQ21603V-FSTF-LED LCD MODULE, ALPHANUMERIC, 16X2 32 4.6V 3.15 10 * 36 Batron BTHQ21605V LCD MODULE, ALPHANUMERIC, 16X2 32 4.6V 5.55 15.8 * 61 Batron BTHQ21608VSS LCD MODULE, ALPHANUMERIC, 16X2 32 4.6V 5.55 15.8 * 61 Batron BTHQ22005VSS LCD MODULE, ALPHANUMERIC, 20X2 40 4.5V 5.55 18.6 * 83 DENSITRON LMR4047BG2C16HNG/5V LCD MODULE, 2X16, B/L 32 5V 4.35 9 * 54.7 DENSITRON LMR4052BG2C20HNG/5V LCD MODULE, 2X16, B/L 32 5V 5.15 10.7 * 68.5 EVERBOUQUET MC1602C8-SYL LCD MODULE, ALPHANUMERIC, 2X16, STN 32 5V 4.86 36 * 80 EVERBOUQUET MC2002D-SYL LCD MODULE, ALPHANUMERIC, 2X20, STN 40 5V 4.85 37 * 116 LUMEX LCM-S01602DSR/D DOT MATRIX LCD DISPLAY 16X2 32 4.6V 3.15 10 * 36 LUMEX LCM-S02402DSR LCD Alphanumeric Display 48 5V 5.55 16 * 93.5 TRIDENT TRIMODS1538STNLEDTFV LCD MODULE, ALPHANUMERIC, 16X2, B/L 32 5V 5.56 15.6 * 61 TRIDENT TRIMODS1544 LCD MODULE, ALPHANUMERIC, 20X2 40 5V 5.63 18.6 * 83 VARITRONIX MDLS162653V LCD MODULE, ALPHANUMERIC, 2X16, STN 32 3V 5.55 13.8 * 61 VARITRONIX MDLS20265-LV LCD MODULE, ALPHANUMERIC, 20X2, STN 40 5V 4.85 18.6 * 83 VARITRONIX MDLS24265SP-LV-LED04 LCD MODULE, ALPHANUMERIC, 24X2, B/L 48 5V 4.5 15.8 * 93.5
- 15. Peripheral Solutions Product Type Farnell Newark 12/14/16 Bit ADC Click Click Instrumentation Amplifier Click Click LCD Controller Click Click Power Management Click Click Battery Management Click Click LCD Display Click Click Batteries Click Click Clock Click Click
Editor's Notes
- Handheld Infrared Thermometer
- Welcome to the training module on Handheld Infrared Thermometers . This training module will introduce handheld infrared thermometer knowledge and recommend one solution for it.
- An infrared thermometer is a non-contact temperature measurement device. It takes advantage of the fact that all objects emit electromagnetic radiation or energy above absolute zero. This radiation, like X-rays, radio waves, and visible and ultraviolet light is electromagnetic in nature and travels at the speed of light. The higher the temperature of an object, the shorter the wavelength of the peak infrared radiation it emits. It detects the infrared energy emitted by objects and converts the energy factor into a temperature reading.
- Infrared thermometers use infrared technology to quickly and conveniently measure the surface temperature of objects. They provide fast temperature readings without physically touching the object. Users simply aim, pull the trigger and read the temperature on the LCD display. Lightweight, compact and easy to use, infrared thermometers can safely measure hot, hazardous or hard to reach surfaces without contaminating or damaging the object. Also, infrared thermometers can provide several readings per second, as compared to contact methods where each measurement can take several minutes.
- Infrared thermometers allow users to measure temperature in applications where conventional sensors cannot be employed. Specifically, in cases dealing with moving objects ( i.e., rollers, moving machinery, or a conveyor belt), or where non-contact measurements are required because some applications require users to instantly measure temperature in hard-to-reach areas where users might need a ladder or where the object is hot, rapidly changing temperature, rotating, difficult to reach, energized, or in other dangerous situations (such as high voltage). In harsh environments where fixed or contact thermometers are unable to meet the requirements, a handheld infrared thermometer is the better solution. Besides the industrial applications, infrared thermometers are also used in other field, like fever measurement in medical applications, food quality & safety monitoring in food industry, and a variety of automotive applications.
- When selection an infrared thermometer, users will consider about a few of the critical points, including field of view, type of surface being measured, temperature range, target distance, and response time. The field of view is the angle of vision at which the instrument operates, and is determined by the optics of the unit. To obtain an accurate temperature reading, the target being measured should completely fill the field of view of the instrument. The surface type of the target determines the different emissivity values. In general, the higher the emissivity of an object, the easier it is to obtain an accurate temperature measurement using infrared.
- A handheld infrared thermometer is composed of optical system, infrared temperature sensor, amplifier, ADC, MCU, LCD display, batteries and DC/DC converter. The optical system collects the infrared energy emitted from the target object within its field of view. The infrared temperature sensor converts the collected infrared energy into electrical signal. This signal will then be amplified and converted by an amplifier and ADC respectively to produce a digital signal. The digital signal will be used by the microcontroller to calculate the temperature of measured object based on certain algorithms, and then display the result on the LCD display.
- The infrared temperature sensor detects the infrared energy emitted from the target object. The sensor generates a voltage or current which is proportional to the incident infrared radiation power. According to the considerations we mentioned before, the selection of the IR temperature sensors needs to consider the requirement of application temperature range, field of view, accuracy, and response time. As our solution is a handheld device, the size of the component is also taken into account. At present, the well-known semiconductor companies around the world such as Calex, Perkinelmer, Raytek and GE can provide the infrared temperature sensors for infrared temperature measurement.
- If the infrared temperature sensor doesn’t integrate an instrumentation amplifier, a separate instrumentation amplifier is required to amplify the small signals coming from the sensor. As a part of handheld device, the power consumption is one key considerations. Meanwhile, one of the requirements of IR thermometer is accuracy, so the low noise level, low offset and drift parts should be chosen.
- The zero-drift INA333 offers the lowest power, lowest input bias current, and best overall voltage offset/drift combination of any low, single supply instrumentation amplifier on the market. Designed with TI’s Zero Drift technology the INA333’s low offset/drift combination makes it ideal for applications requiring the best long term stability achievable. And with a proprietary design technique to attenuate chopping noise, the INA333 also achieves industry leading noise performance in the low power, low offset, instrumentation amplifier sub-market. With a supply current of 75uA that is 10% lower than its closest competition, and being capable of running on a single1.8V supply, the INA333 will be the easy choice for analog designers being pushed for lower power, more efficient solutions. And with only 200pA input bias current, the INA333 also can be used in high impedance applications where low power and low voltage offset instrumentation amplifiers have never gone before.
- If the infrared temperature sensor doesn’t integrate an ADC, a separate ADC with high resolution, low power, and small package is required.
- A handheld infrared thermometer uses an 8-bit or 16-bit ultra-low-power microcontroller to control the peripheral devices and compute the temperature of target objects. The MCU will read out the sensor output, calculate the result and convert the result into the appropriate format to control the display driver. Nowadays, LCD is common type of display. Therefore, the selected MCU should be integrated with the capability to interface an LCD. To guarantee the longest possible battery life, the MCU should have a low power consumption. For a convenient auto power down function for saving power, firstly the microcontroller will shut down the peripheral and display, then it will go into sleep mode.
- S08LL 8-bit segment LCD microcontroller helps you reach your target performance levels while minimizing power consumption in your design, demonstrating extreme energy efficiency for ultra-long operation in battery-powered applications. The S08LL family offers two ultra-low-power stop modes, low-power run and wait modes, six microsecond wake-up time, ultra-low-power external oscillator and clock gating registers to disable clocks to unused peripherals. The family also provides design flexibility with a large segment-based (8 x 24) driver and an integrated charge pump to provide a true system-on-chip.
- LCDs are wonderful power-saving displays, and over the last couple of decades technical advancements have confirmed LCDs as the only real option in battery-operated equipment. A small LCD screen is used to display temperature readings, device status, or show operation / functional progress. Based on our application, a monochromic segment LCD meets the requirement.
- The tale lists out some additional components which are used in handheld infrared thermometer solutions. The power management part can be a DC/DC converter or LDO regulator that provides a wide range of input voltage, stable output voltage, and low standby current. As it is a handheld device, battery is used as power source which may be a a rechargeable battery with small size, low weight, large capacity and long service life. The battery management parts help to extend battery life. The amplifier is used to amplify the small signals coming from the photo detector.
- Thank you for taking the time to view this presentation on Handheld Infrared Thermometer. If you would like to learn more or go on to purchase some of these devices, you may either click on the part list link, or simply call our sales hotline. For more design resources you may either visit the element14 site, or if you would prefer to speak to someone live, please call our hotline number, or even use our ‘live chat’ online facility. You may visit element14 e-community to post your questions.