What is the difference between infrared temperature probes and fiber-optic temperature probes?

Infrared temperature probes (pyrometers) typically use lenses or mirrors to image a spot on the target onto an IR detector and compute temperature from the measured spectral radiance, often over a defined wavelength band. Fiber-optic temperature probes guide optical signals through a fiber to a remote optoelectronic unit and may rely on fluorescence decay, interferometric effects, or temperature-dependent spectral shifts, which is advantageous in high-voltage, RF, or MRI environments where metallic or electronic sensors cannot be placed locally.

Which key technical principles and terms should I know when working with non-contact optical temperature probes?

Important concepts include emissivity (ε), which defines how closely a surface approximates a blackbody and strongly influences IR reading accuracy, and spot size or field of view (FOV), which defines the measurement area on the target. Additional terms include response time (time constant), spectral band (e.g., 8–14 µm vs 0.9–1.7 µm), calibration uncertainty, and for fluorescence/fiber probes, parameters like fluorescence decay time, Bragg wavelength shift, or interference fringe spacing as functions of temperature.

What specifications matter most when selecting an infrared or optical temperature probe?

Critical specs include temperature range, spectral response, accuracy, repeatability, and response time, as well as optical parameters like distance-to-spot-size ratio (D:S), focus range, and alignment features (e.g., laser sighting). You should also consider target material and emissivity, required environmental ratings (temperature, IP protection, vibration), output interfaces (analog voltage/current, digital, fiber), and compatibility with your control or data acquisition system.

How should I compare different sub-types of optical temperature probes for my application?

For moving or inaccessible hot surfaces (e.g., metals, glass), compare IR pyrometers by wavelength band, ability to handle low or variable emissivity, measurement speed, and optical resolution at your working distance. For applications in strong EM fields, confined spaces, or where electrical isolation is critical, compare fiber-optic or fluorescence-based probes by allowed ambient conditions at the probe head, fiber length and bend tolerance, calibration stability, and immunity to interference or background light.

What are typical lead times, pricing drivers, and customization options for temperature probes?

Standard catalog IR pyrometers and optical probes often have lead times from 2–6 weeks, while highly specialized or ruggedized designs, multi-wavelength systems, or custom optics can extend to 8–12 weeks or more. Pricing is driven by temperature range, accuracy class, optics quality (adjustable focus, small spot), signal conditioning and interfaces, and required certifications; customization can include tailored wavelength bands, special probe head geometries, fiber types and lengths, vacuum feedthroughs, and application-specific calibrations.

How can I find, compare, and request quotes for temperature probes on FindLight without registering?

On FindLight, navigate to Non-Contact Inspection → Optical Inspection → Temperature Probes, then use the filters for temperature range, wavelength band, output type, and form factor to narrow results and open individual product pages for detailed datasheets. You can compare options by viewing technical specs side by side in your browser and request quotes directly from suppliers using the contact or RFQ forms on each product page; no user registration is required to submit technical questions or pricing requests.

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Non-Contact Optical Temperature Probes

HIGH TEMPERATURE FIBER SENSORS PROBE UP TO +500C

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Sold by: FORC-Photonics Ships from: Russia

Specifications
Operation Temperature Range:	Not Specified
Temperature Sensitivity:	6.5 pm/degC
Response Time:	10 Sec
Probe Diameter:	4 mm
Probe Length:	200 mm

Did You Know?

Workers in the oil exploration industry utilize temperature probes to monitor drill bit temperature, preventing overheating and breakage of the drill bit as it progresses deep down into the earth. Temperature probes are fiber-based thermal sensing devices that measure changes in temperature-sensitive characteristics, such as voltage difference or resistance, to infer a temperature value. There are several different categories of temperature probes including penetration probes, immersion probes, air probes, surface probes, along with numerous types of specialized probes. Today, many of these devices are able to operate within a large temperature range, about -70 to 275 degrees Celsius, which is one reason they find an extensive array of applications in many different industries.

Frequently Asked Questions

Optical temperature probes used in non-contact inspection infer surface or near-surface temperature from emitted, reflected, or transmitted radiation rather than direct physical contact. Common approaches include infrared (IR) pyrometry based on Planck’s law, fluorescence-based probes where temperature modulates emission intensity or lifetime, and fiber-optic sensors where the probe head views the target remotely while the signal is routed by fiber to a detector.

Overview of Temperature Probes

Temperature Probes in the context of optical inspection are non-contact sensing heads that convert emitted or reflected radiation into a temperature reading. These probes typically couple with pyrometers, infrared cameras, or fiber-coupled detectors to monitor thermal conditions on targets that cannot be touched, such as rotating parts, live electronics, or high-voltage components.

Unlike contact thermocouples or RTDs, optical Temperature Probes observe infrared or visible/near-IR radiation from the measurement spot. The probe optics define the spot size and working distance, while internal filters and detectors set the usable spectral band and response time.

Typical Specifications

Temperature range: Commonly from ~50 °C up to 2000+ °C depending on detector and wavelength band.
Spectral range: Often 0.8–1.1 µm, 1.6–2.4 µm, 3–5 µm, or 8–14 µm, selected to match material emissivity and process transparency.
Optical configuration: Defined field-of-view or spot size vs. distance; some Temperature Probes use fiber-optic links to remote electronics for harsh environments.
Accuracy and repeatability: Typical accuracy from ±0.5% to ±2% of reading; repeatability generally better.
Response time: From sub-millisecond to hundreds of milliseconds, important for dynamic processes.
Environmental ratings: Cooling jackets, purge ports, and IP-rated housings for dusty, hot, or vacuum environments.

Use Cases in Light Detection and Inspection

Optical Temperature Probes are used in semiconductor wafer inspection, laser processing monitoring, furnace and kiln surveillance, plastics extrusion, glass forming, and electronics reliability testing. In R&D, they enable fast, localized thermal profiling during laser heating, photonic device characterization, or materials research without disturbing the sample.

Buyer Guidance on FindLight

When comparing Temperature Probes on FindLight, start with temperature range and spectral band relative to your target material and process window. Verify optical geometry to ensure the spot size at your working distance covers only the region of interest. Check response time, accuracy, and interface compatibility with your existing pyrometers, DAQ systems, or inspection platforms.

You can request quotes directly from suppliers for any listed Temperature Probes and obtain detailed datasheets or application notes. No registration is required to contact vendors, allowing you to rapidly evaluate options and align probe specifications with your process and metrology requirements.