How do common QPI techniques like digital holographic microscopy (DHM), diffraction phase microscopy (DPM), and transport-of-intensity equation (TIE) methods work?

Digital holographic microscopy records interference between a reference beam and an object beam on a digital sensor, then numerically reconstructs the complex wavefront to retrieve phase information in real time. Diffraction phase microscopy uses a common-path interferometer and spatial filtering in the Fourier plane to encode phase gradients into intensity, improving stability against vibrations. TIE-based methods derive phase from multiple defocused intensity images using the transport-of-intensity equation, avoiding interferometry but typically requiring precise axial scanning and good SNR.

What are common output metrics and data products from QPI systems?

Typical outputs include quantitative phase maps (in radians or nanometers of optical path length), refractive index distributions (if thickness or medium index is known), and derived biophysical parameters such as cell dry mass, volume, and membrane fluctuation amplitude. Many systems also provide time-lapse phase videos, phase-gradient images, and statistical summaries (histograms, segmentation-based measurements) that can be exported in standard formats (TIFF, HDF5, CSV) for downstream analysis or integration with custom image-processing pipelines.

Which key specifications should I evaluate when selecting a Quantitative Phase Imaging camera or system?

Important parameters include phase sensitivity (e.g., rms phase noise in milliradians or equivalent path length in nanometers), spatial resolution (dictated by NA and pixel size), temporal resolution (maximum frame rate at full or ROI readout), and stability against drift and vibration. You should also consider illumination wavelength and coherence, field of view, bit depth and full-well capacity of the sensor, compatibility with your microscope platform (infinity-corrected optics, tube lens, camera port), and available software APIs (LabVIEW, MATLAB, Python, or SDKs) for integration into existing workflows.

How do different system configurations (standalone QPI modules, camera-based add-ons, and integrated microscopes) compare for various applications?

Camera-based QPI add-ons that mount on a microscope camera port are suitable when you already have an inverted or upright microscope and need to retrofit label-free phase measurements with minimal changes, though they may be limited by the base optics and mechanical stability. Standalone or integrated QPI microscopes typically provide better mechanical and thermal stability, optimized illumination, and turnkey calibration routines, which are beneficial for long-term live-cell imaging and high-throughput screening. Some vendors also offer fiber-coupled or OEM modules for in-line metrology and industrial inspection, prioritizing robustness, compactness, and integration interfaces (TTL, GigE, Camera Link, or CoaXPress).

What factors influence pricing, customization options, and lead times for QPI systems?

Pricing is driven mainly by the complexity of the interferometric optics, sensor performance (sCMOS vs CMOS, pixel size, frame rate), included software licenses, and whether the system is a full microscope or an add-on module. Customization—such as specific wavelength illumination, vacuum- or incubator-compatible stages, OEM integration, or custom mechanical adapters—typically increases both cost and lead times, which can range from a few weeks for standard camera add-ons to several months for fully integrated or OEM-configured systems. For accurate quotations, suppliers often request details on your microscope model, required NA and field of view, environmental conditions, and preferred control software.

How can I locate, compare, and request quotes for Quantitative Phase Imaging products on FindLight without creating an account?

On FindLight, navigate to Imaging and Vision → Cameras → Quantitative Phase Imaging, or use the search bar with filters such as "digital holographic microscopy," "QPI add-on," or "label-free phase contrast." Each listing presents key specifications (sensor type, phase sensitivity, resolution, interface) in a comparable format; you can open multiple product pages in parallel to compare datasheets and compatible platforms. To request a quote without registration, use the contact or RFQ form on the product page, provide your technical requirements and anticipated volume, and your inquiry is routed directly to the supplier for pricing and lead time information.

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Quantitative Phase Imaging

Quantitative Phase Imaging Cameras for Precision

SID4 sC8 High Resolution sCMOS Quantitative Phase Imaging Camera

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Sold by: PHASICS Ships from: France

Specifications
Wavelength Range:	400 – 1050 nm
Aperture Size (horizontal):	16.64 mm
Aperture Size (vertical):	14.04 mm
Phase Spatial Resolution:	19.5 um
Phase & Intensity Sampling (horizontal):	852 pixels

Did You Know?

Did you know that quantitative phase imaging (QPI) can measure dry mass of single living cells with sensitivity on the order of a few picograms by retrieving optical path length with nanometer-scale precision? Unlike fluorescence, QPI exploits interference of coherent or partially coherent light to map phase delays caused purely by refractive index and thickness variations, enabling label-free monitoring of cell growth, membrane fluctuations, and organelle transport in real time. This means you can track subtle biophysical changes over hours to days without photobleaching, phototoxicity, or perturbation of the sample’s native state.

Related Resources

Frequently Asked Questions

Quantitative Phase Imaging is an interferometric or phase-contrast–based technique that measures optical path length variations across a transparent specimen, providing a quantitative phase map proportional to local refractive index and thickness. Unlike brightfield, which mainly yields low-contrast intensity images of transparent samples, or fluorescence, which requires labels, QPI produces label-free, quantitative data such as dry mass density, cell volume, and morphology with nanometer-scale path length sensitivity.

What Is Quantitative Phase Imaging?

Quantitative Phase Imaging is an optical modality that measures the phase delay induced by transparent or weakly scattering samples, converting it into quantitative maps of optical path length. Unlike qualitative phase contrast or DIC, Quantitative Phase Imaging yields calibrated metrics such as height, refractive index distribution, and dry mass without labels or staining.

On FindLight, Quantitative Phase Imaging solutions are typically camera-based modules or integrated systems that attach to standard microscopes or imaging setups. They combine interferometric or computational phase retrieval optics with high-sensitivity sensors and dedicated reconstruction software.

Key Specifications for Quantitative Phase Imaging Cameras

When evaluating Quantitative Phase Imaging products, engineers and scientists should focus on parameters that directly impact phase accuracy and throughput:

Sensor type and format: sCMOS or CCD, pixel size, resolution (e.g., 2–20 MP), dynamic range, and bit depth (12–16 bit) for low-noise phase reconstruction.
Phase sensitivity: minimum detectable optical path length change (e.g., sub-nanometer to a few nanometers), phase noise, and stability over time.
Acquisition speed: frame rate at full resolution (from a few fps to hundreds of fps) for live-cell Quantitative Phase Imaging and dynamic processes.
Spectral range and illumination: compatible wavelengths (typically visible, 500–700 nm), coherence requirements, and compatibility with LED or laser illumination.
Optomechanical compatibility: mounting interfaces, tube lens requirements, support for common microscope standards, and available objective NA range.
Software and data output: phase map export formats (TIFF, HDF5), SDK/API availability, and integration with existing analysis pipelines.

Typical Use Cases

Quantitative Phase Imaging is widely used in live-cell imaging, cell growth and morphology tracking, label-free cytometry, microfluidics, thin-film metrology, and surface profiling. In each case, Quantitative Phase Imaging provides objective, repeatable metrics that can be correlated with biological or physical properties.

Buyer Guidance on FindLight

When sourcing Quantitative Phase Imaging solutions on FindLight, compare phase sensitivity, frame rate, resolution, and software integration against your experimental constraints (sample type, illumination, and environmental stability). Assess whether the Quantitative Phase Imaging camera can retrofit your existing microscope or if a complete system is required.

For each Quantitative Phase Imaging product, review the detailed datasheet, then contact suppliers directly to clarify compatibility, SDK support, and delivery timelines. You can request quotes and technical information without registration, streamlining procurement for R&D and production environments.