Optical sensor for wristband heart monitors

10 June 2015 Opto-Electronics

The SFH 7051 from Osram Opto Semiconductors is an integrated optical sensor specially designed for heart rate monitoring. Targeted at use in fitness trackers, smart watches and other wearables, it consumes very little power, thereby maximising battery life.

The device consists of a large-format photodiode and three green LEDs with a wavelength of 530 nm. It measures the volume of blood passing through blood vessels by shining light onto the surface of the skin. Different amounts of this light are absorbed by blood and the surrounding tissue, while the light not absorbed is reflected to the detector. With its green emission spectrum, the SFH 7051 is ideal for measuring the pulse rate at the wrist.

The green emitter chips are based on OSRAM’s latest high-efficiency UX:3 chip technology. The sensor uses three of these chips so that they can be operated at 20 mA; at this operating current the efficiency of the emitters is particularly high. The SFH 7051 produces an optical output of 3 x 3,4 mW at a current of 20 mA and a voltage of 3,2 V.

With an area of only 1,7 mm², the photodiode is small enough to enable the sensor to be compact, but sensitive enough to offer the required signal quality. Its low capacitance of only 11 pF ensures short switching times and high measuring frequency.

For more information contact Petrus Booyens, OSRAM Opto Semiconductors, +27 (0)79 525 1779, [email protected], www.osram-os.com

Further reading:

Compact direct Time-of-Flight 3D LiDAR module
Altron Arrow Opto-Electronics Electronics Technology AI & ML
The VL53L9 from STMicroelectronics is the first direct Time-of-Flight (dToF) 3D LiDAR all-in-one module in ST’s portfolio, offering a resolution of 2,3K zones, wide field of view, on-chip processing, 100 frames per second, and sensing range from 5 centimeters to 9 meters.

Read more...

---

Easy to integrate, quick to react
Opto-Electronics
Würth Elektronik has expanded its range of WL-ICLEDs – RGB-LEDs with integrated controller – to include dual-wire ICLEDs.

Read more...

---

Industrial time-of-flight proximity sensor
EBV Electrolink Opto-Electronics
STMicroelectronics’ VL53L4ED is a compact, high accuracy time-of-flight proximity sensor designed for industrial and embedded applications that require precise short range distance measurement.

Read more...

---

Flexible enclosure lighting solutions
IOT Electronics Opto-Electronics
Phoenix Contact’s range of enclosure lights is designed to provide uniform illumination throughout control cabinets, while offering flexible installation and energy-efficient operation.

Read more...

---

Industry’s smallest laser firing system IC
Opto-Electronics
Silanna Semiconductor recently announced that its FirePower laser firing system ICs for smaller, more efficient LiDAR and rangefinder applications are available in production quantities.

Read more...

---

More light, greater efficiency, better growth
Würth Elektronik eiSos Opto-Electronics
Würth Elektronik has expanded its WL-SMDC Horticulture product line with new LEDs with wavelengths of 450, 660, and 730 nm in the 3535 package.

Read more...

---

Intelligent control boosts tunnel safety
IOT Electronics Opto-Electronics
Intelligent tunnel lighting systems are helping operators by delivering adaptive illumination that enhances both safety and energy efficiency.

Read more...

---

Case Study: Turning data into insight
Hamamatsu Photonics UK Editor's Choice Opto-Electronics
Hamamatsu Photonics’ InGaAs PIN photodiode detector has proven consistent, reliable, and robust for more than a decade, helping Axetris to deliver stable, repeatable measurements.

Read more...

---

Reliable imaging for industrial applications
Vepac Electronics Opto-Electronics
Combining a high-performance camera with an integrated high-speed processor, these compact systems enable advanced image sensing directly at the device level.

Read more...

---

Panasonic Industry launches its first flat lens, high-performing PIR sensor
Opto-Electronics
Panasonic Industry has announced the launch of its latest innovation in PIR motion sensors: the Flat Wide Detection Type (12 lens), being the first product incorporating its new PaPIRs+ technology.

Read more...

---