IBM Photothermal Deflectometry Research
The principle of probe beam deflection caused by refractive index gradient
Verification date: 2026-10-24
View original public information →LSP260 · Materials and chemical photothermal research · Chemical droplet wetting and interface
Need to add new core
Comparative study on thermal response before and after coating
Facing the coating substrate, using the deflection of the photothermal probe as the observation route, the simulated output modulates the deflection difference. The page is for project evaluation and does not mean that the development has been completed or has been accepted on site.
Project Judgment Summary
Product/Devicecoating substrate
Measure routeTHERMAL · Photothermal probe deflection
Ability GradingNeed to add new core
Verification statusThe actual machine/product domain acceptance of this scenario has not been carried out
Scene nature:Similar potential application scenarios for laser spots. The potential application scenario has not yet been developed into a complete product system; the actual machine/product domain acceptance of this scenario has not been carried out. The actual product/product domain acceptance quantity in catalog statistics is 0.
Business tasks and intended output
- target audience
- Coated Substrate: Photothermal Probe Deflection
- pseudo output
- modulation deflection difference
- Applicable conditions
- The film thickness cannot be directly determined by a single frequency signal.
- priority
- Special development. The measurement/control core needs to be supplemented and verified according to the special project approval
Imaging input and algorithm routing
Imaging and device conditions
The pump/probe optical path, modulation reference and thermal boundaries are known, and the samples cover the modulation frequency. Pump/probe optical path, synchronized modulation and controlled temperature environment
THERMAL · Photothermal probe deflection
The pump/probe optical path, modulation reference and thermal boundaries are known, and the sampling covers the modulation frequency
- A74short time Fourier transform STFT
- A101Adaptive threshold laser spot grayscale centroid
- A103Logarithmic quadratic surface sub-pixel spot center
- A107Laser spot quality and usability diagnostics
- A112Laser spot two-dimensional repeatability and coverage ellipse
Existing algorithmic evidence:A101–A112 only complete analytical synthesis spot and controlled geometry verification; see laser_spot_benchmark.json
Current capabilities and capabilities to be supplemented
Need to add new core
Need to add core computing
Light point extraction can only be used as an observation front-end, and core capabilities such as three-dimensional reconstruction, closed-loop control, wavefront or physical quantity inversion need to be developed and verified separately.
Gaps in this scenario:New phase locking/thermal diffusion/refraction models and physical property parameter inversion need to be added; image deflection does not directly give thermal conductivity or absorptivity. The film thickness cannot be determined directly from a single frequency signal. All physical property outputs are inversions to be developed and are not directly replaced by displacements.
Route-level gaps:New phase locking/thermal diffusion/refraction models and physical property parameter inversion need to be added; image deflection does not directly provide thermal conductivity or absorptivity
"New cores required" only describes the relative development volume and does not constitute a commitment to accuracy, tempo, stability or delivery time.
Verification methods and acceptance prerequisites
Verify the inversion using reference materials and independent thermal analyzers, varying frequency, beam offset, and boundary conditions. Reference materials, blank samples and independent physical property instrument comparison
| Acceptance items | Evidence required for project confirmation | Current status |
|---|---|---|
| Inputs and samples | Real device original frames, normal/abnormal samples, exposure and light path conditions, sample grouping and set aside | Not provided, waiting for project input |
| Magnitude and Error | Independent reference value, calibration record, error statistical caliber and mutual confirmation threshold | Not verified |
| Exceptions and boundaries | Anticipated handling of missed detections, false detections, overexposure, occlusion, reflection, out-of-view and communication abnormalities | To be defined |
| System integration | Interface, time synchronization, deployment platform, tempo, log, version and continuous running record | Not integrated |
Evidence sources and citation boundaries
The source supports measurement principles or similar applications; the module combination, device and acceptance method in this scenario are engineering derivation, and product verification has not been completed.
NIST blue light triangulation study near flame
Displacement measurements and thermal gradient effects in specific fire tests, without extrapolation of values
Verification date: 2026-10-24
View original public information →Research on Speckle Uncertainty of Laser Triangulation
Effect of speckle on position and distance uncertainty
Verification date: 2026-10-24
View original public information →Source usage scope:The public information is used to support the measurement principle or the existence of similar applications, and does not prove that this scenario has been developed, deployed or accepted by Jishi Technology.
Project consultation
xuzhiyang0928@gmail.com
Define the Development Scope with Samples and Device Requirements
Comparative study on thermal response before and after coating
Please describe the task object, original picture or video, target indicators, device platform, interface and sample situation.
Phone: 13910119357xuzhiyang0928@gmail.com