Intelligent Material as sensors

The crystal reports back.

The same crystals that carry a code can also measure. Their light changes with how many there are, how hot they are, and what they are bound to. A reader turns that light into a number, with no wires and no contact.

One crystalone light, three readings BRIGHTNESS How much → dose, concentration, biomarker level COLOR RATIO Blue vs. gold → temperature TIMING Rise and decay → temperature, identity Illustration

Temperature · measured data

A thermometer you read with light.

Heat the phosphor and the blue band near 455 nm climbs against the peak at 493 nm, steadily, from room temperature to 1,100 °C. The ratio is the temperature. Press play, or drag the slider.

Intensity (a.u.)
Emission spectra from 440 to 515 nanometers at temperatures from 26 to 1100 degrees Celsius. The band near 455 nanometers rises with temperature while the peak near 493 nanometers stays fixed.
Emission spectra of an IMS thermal phosphor from 26 °C to 1,100 °C, normalized to the 493 nm peak. Markers show the 455 nm band at the selected temperature, read from the figure.
Temperature
26–76 °C
455 / 493 = 0.06
264007009001,100 °C
Clock 1 · color ratio26 → 1,100 °C

The blue band grows against a fixed reference peak. Shown above.

Clock 2 · rise time~1% per °C

Rise-time change of Y₂O₂S:Yb,Er powder between −50 and 100 °C (Sabri et al., 2018).

Clock 3 · decay time0.70 → 0.45 ms

Decay of La₂O₂S:Yb,Er in a silicone film, −50 to 200 °C (Sabri et al., 2018).

Timing sensors need only one detector, and smoke, dirt or a tinted window that skews colors does not fool them. It is the same rise-and-decay clock that codes a crystal.

Publication · co-authored by IMS · MRS Advances, 2018Thermal and optical characterization of upconverting thermographic phosphor polymer composite filmsF. Sabri, S. W. Allison, M. Aryal (University of Memphis; Emerging Measurements), J. Collins and H. Bell (Intelligent Material Solutions). Rare-earth phosphors in flexible silicone films as reusable temperature sensors, read with a 980 nm laser.
Read the paper ↗

Where temperature by light could go

Places a wire can't reach.

Ideas we would like to test with partners. A coating, a film or an ink, read from a distance.

Engines & turbines

Hot surfaces

A coating read through a window, up to furnace temperatures.

Batteries

Hot spots

Watch cells for local heating before it spreads.

Electronics

Under the coating

The same conformal coating as LightMap™ boards, now also a heat map.

Wearables

Flexible films

Soft silicone sensors that bend with skin or fabric.

Cold chain

Down to −50 °C

Labels on vaccines and food read with a light.

Something to measure?

Let the crystal report back.

Tell us what you need to measure and where. We will design the crystal, the carrier (ink, film, coating or strip) and the reader. NovaVera Corp. makes and sells Intelligent Material.