Spray Pattern & Plume Geometry Testing

Aerosol Science

Laser-sheet imaging on a controlled actuation rig, paired with LaVision analysis, produces replicate-traceable plume geometry and spray pattern datasets aligned with FDA nasal-spray guidance.

Purpose & when to use

Spray Pattern and Plume Geometry (SP / PG) testing quantifies how an atomized spray expands in air and deposits on a target — plume angle, width, and pattern diameter — for nasal sprays, oral sprays, and pressurized consumer aerosols. Laser-sheet imaging on a controlled actuation rig with LaVision analysis delivers FDA-aligned nasal-spray submission packages under USP <601>; the same fixtures support development screening and root-cause work. SP / PG is foundational for:

FDA-aligned nasal spray submission packages — plume geometry within ~30 ms of actuation plus spray pattern at FDA-recommended capture distances, framed under FDA nasal / oral spray guidance and USP <601>.
Lot-to-lot and design-change comparability for nasal pumps, oral spray valves, and aerosol actuators — pump, nozzle, valve, or formulation updates under ICH Q5E and FDA change-control guidance with documented replicates.
Robustness mapping across actuation force, fill level, viscosity, and temperature for consumer aerosols and pump sprays — supports EPA registration packages and ISO 27427-aligned nebulizing-equipment characterization.
Root-cause investigation of asymmetric sprays, plume tailing, intermittent actuation, and pattern drift across canister life — pairs with high-speed imaging under FDA inspection-readiness and ICH Q9 quality-risk principles.
Pump and valve development DOE studies on nozzle geometry, swirl chamber, and metering tweaks — fast iteration on the same fixtures that anchor submission work under FDA development-stage CMC guidance.

Use SP / PG testing when emitted spray geometry is central to the regulatory or development question. This may include local deposition related to nasal-spray bioavailability, coverage uniformity for consumer sprays, or sensitivity to formulation and actuation conditions. The resulting imaging data are traceable to a defined fixture, capture distance, and image-quality acceptance criteria.

Built for sprays, nasal devices, and pressurized aerosols

Spray pattern and plume geometry characterization spans the device classes that put atomized formulations into the air — pharmaceutical, consumer, and industrial spray products under one analytical roof.

Nasal sprayIntranasal pumps and devices
Oral spraySublingual and topical-oral
Pressurized aerosolPropellant-driven cans
Pump sprayMechanical pump bottles
Consumer aerosolSprays · fogs · misters

Instrumentation & measurement ranges

We select the imaging configuration based on the device and the decision the data must support. Submission-grade and development-screening fixtures use the same measurement basis.

10 – 200 mmoptical

Laser-sheet / planar illumination imaging

Thin planar illumination of the spray cross-section at controlled standoff distances — the regulator-aligned basis for plume angle and width. Synchronization with actuation captures the plume within milliseconds of fire.

1 – 1000 mstime-window

Plume Master actuation rig (in-house)

Custom in-house actuation fixture with stepper-driven force, displacement, and timing control — repeatable shot-to-shot capture for plume geometry datasets across single-actuation and full-canister studies.

30 – 60 mmcapture-distance

LaVision DaVis image-analysis software

Quantitative extraction of plume boundary, plume angle, pattern diameter, area, ellipticity, and circularity — calibrated pixel-to-mm scaling with documented acceptance criteria for focus and saturation.

0.1 – 980 µmdiffractive

Malvern Spraytec (paired droplet sizing)

Volume-weighted droplet spectra running alongside SP / PG when the program needs droplet-size and plume-geometry data on a matched set of actuations — pairs the two attributes on a single canister.

Test method options

Method	Strengths	Tradeoff	Aligned with
Regulator-aligned nasal / oral spray SP-PG (submission package)	Plume angle, width, and pattern at FDA-recommended distances with controlled actuation — the canonical ANDA / NDA submission package. Replicates at beginning, middle, and end of canister with documented acceptance criteria — submission-ready figures and statistics out of the box.	More fixture setup and image-acceptance overhead than screening — best when the device is locked and the data is filing-bound.	FDA nasal / oral sprayUSP <601>
Development screening for pump / nozzle / valve iteration	Fast feedback for design changes — same fixtures as the submission method, but reduced replicates and acceptance bands tuned for iteration. Supports DOE sweeps across nozzle geometry, swirl chamber, valve metering, and viscosity to map each variable's effect on plume and pattern.	Not sufficient on its own for formal comparability without added replicates and controls; bridge to the submission method before filing.	—
Robustness mapping across actuation and environment	Surfaces the use-condition envelope across actuation force, fill level, viscosity, and temperature where plume and pattern stay in spec. Output feeds change-control packages and predicate comparisons under FDA nasal / oral spray framing when product variations are assessed.	More conditions per study increase sample count and analysis time — scope tightly to the variables that drive the decision.	FDA nasal / oral spray
Failure investigation (asymmetry · tailing · intermittent spray)	Targets root causes of sprayability defects with iterative fixture work — pairs naturally with high-speed imaging for time-resolved diagnostics. Documented under ICH Q9 quality-risk framing so the investigation output supports CAPA packages and inspection-readiness narratives.	Often needs iterative fixture and acceptance-criteria tweaks — schedule unpredictability is higher than a fixed-protocol study; budget two or three rounds.	ICH Q9
Paired SP-PG plus droplet sizing (Malvern Spraytec)	One set of actuations yields plume geometry, spray pattern, and droplet-size distribution — the trio that governs nasal-spray local deposition. Strong framing for in vitro bioequivalence packages and predicate comparisons where the regulator wants the full sprayability picture, not three separate studies.	Higher instrumentation and analyst overhead per condition — reserve for programs where the combined dataset materially changes the submission strategy.	FDA nasal / oral sprayUSP <601>

Setup configurations

Every spray pattern study uses a configuration matched to the device, intended use condition, and decision the data must support. The setup balances submission rigor, including controlled actuation, capture distance, and image acceptance criteria, with the practical behavior of the device under test. During study planning, we define the dimensions below so the plume geometry and spray pattern data remain interpretable and defensible:

Device interfaces

Adapters for nasal pumps, oral spray valves, pressurized canisters, pump bottles, and consumer triggers — geometry and orientation matched to the device under test and the regulatory question.

Flow & actuation profiles

Stepper-controlled force, displacement, velocity, and dwell — manual, pneumatic, or mechanical fixtures sized to mimic patient or operator use conditions with shot-to-shot repeatability.

Sample numbers

Replicate actuations per condition (typically n=15+ for submission work spanning beginning-middle-end of canister), with power sized to declared shot-to-shot and device-to-device variability.

Environmental controls

Temperature and humidity controlled and logged where viscosity, propellant, or actuator response is sensitive — environment recorded alongside each capture in the chain of custody.

Calibration & verification

Pixel-to-mm scaling, laser sheet alignment, and actuation force / displacement verified against traceable standards before each campaign and re-verified between condition blocks.

Methods anchored to the standards that matter

Every spray pattern study follows a documented quality system aligned with the regulatory frameworks for nasal sprays, oral sprays, and consumer aerosols. The four anchors below define the data requirements carried through to the Section 7 outputs.

ISO 17025AccreditedTesting-laboratory competence — documented methods, calibration traceability, and uncertainty contributors.
FDA nasal / oral sprayAlignedBioequivalence and CMC framing for nasal and oral spray submissions.
USP <601>AlignedAerosols, nasal sprays, MDIs, and DPIs — performance quality tests.
ISO 27427AlignedAnaesthetic and respiratory equipment — nebulizing systems and components.

Key data outputs & reporting

Every spray-pattern study delivers a documented set of plume and pattern metrics plus the underlying image data — plume angle and width versus distance, spray pattern diameter, area, circularity and ellipticity, qualitative uniformity flags, summary statistics across replicates, and traceable QA / QC controls — formatted for regulatory submission, change-control packages, or design iteration. The deliverables below cover the standard SP / PG report; complex programs (comparability, predicate studies, full canister-life mapping) get an extended package with the artifacts beneath the table.

Primary outputs

Plume angle and plume width versus capture distance with shot-to-shot replicate statistics (mean, SD, CV per condition).
Spray pattern diameter, area, ovality / ellipticity, circularity, and qualitative uniformity indicators on a defined target plane.
Annotated overlays comparing lots, devices, actuation conditions, or beginning-middle-end canister positions against predicate, control, or specification baselines.

Deliverables

#	Format	Contents
01	PDF report	Methods, fixtures, acceptance criteria, and results tables.
02	CSV / XLSX datasets	Plume and pattern metrics with replicate statistics.
03	Annotated images and clips	Laser-sheet captures and side-by-side overlays for internal reviews and submission appendices.

Extended deliverables · multi-arm comparability · stability · predicate studies

Comparability appendix — Side-by-side plume / pattern overlays plus statistical equivalence tests per ICH Q1E or product-specific predicate framing.
Canister-life mapping pack — Plume and pattern trends across beginning-middle-end actuation positions with predefined acceptance bands flagged.
Method-development notes — Documentation of fixture-selection rationale, image acceptance criteria, and uncertainty contributors — for submission cover letters and inspection readiness.

QA / QC & data integrity

Every spray pattern study includes a documented QA / QC framework matched to the method plan. Controls and verifications are selected for the regulatory framework, imaging chemistry, and decision the data must support. These checks run alongside laser-sheet image capture, are audited under our ISO 17025 quality system, and remain traceable from sample receipt through the final result. Recovery and environmental monitoring are added when required by the assay.

Image calibration checks for pixel-to-mm scale, laser sheet alignment, and background subtraction before each capture block.

Replicate actuations and repeat runs to quantify variability across canister position, devices, and lots.

Defined acceptance criteria for image focus, saturation, plume boundary definition, and background contrast at the capture distance.

Actuation force, displacement, and distance verification logs alongside captured images and analyzed metrics.

Chain of custody from sample receipt through image acquisition, analysis exports, and final reporting.

Why ARE Labs

ARE Labs connects technical topics to practical study design, method selection, controlled aerosol work, and reportable evidence without turning technical pages into sales pages.

Reviewed byJamie Balarashti (25 yrs - cascade & inhalation methods) - Weston Schaper (7 yrs - real-time sizing & nanoparticle work)

17025Accredited testing

900+Studies Performed

17+Years in operation

300+Clients supported

Common questions

These answers address common questions from nasal-spray, consumer-aerosol, and pump-spray teams planning a spray pattern and plume geometry study, including method selection, actuation control, replicate counts, comparability, and deliverables. They are starting points, not protocols. Contact us if your device, formulation, or regulatory framework differs from the examples here. Most SP / PG studies require at least one custom fixture or image-acceptance decision that is easier to define during a call.

Q.What is the difference between plume geometry and spray pattern?

A.Plume geometry describes the spray as it expands in air, using measurements such as plume angle and plume width. Spray pattern describes the distribution deposited on a defined target plane, including diameter, area, and circularity. Most nasal-spray submissions report both.

Q.How many actuations are needed per condition?

A.Replicate count depends on device variability and the comparability objective. Submission packages typically use n=15+ across the beginning, middle, and end of canister life, while development screening often uses fewer replicates. We define the replicate plan during study planning based on the required precision.

Q.Can you control actuation force and timing?

A.Yes. Our Plume Master rig uses stepper control to manage force, displacement, velocity, and dwell. Manual, pneumatic, or mechanical fixtures can be sized to mimic patient or operator use across the range of actuation profiles required by the study.

Q.Do you support FDA-aligned nasal spray submissions?

A.Yes. We measure plume geometry at FDA-recommended capture distances, typically 30 mm and 60 mm, using documented acceptance criteria. Submission packages are aligned with FDA nasal / oral spray guidance and USP <601> framing.

Q.What do you deliver?

A.Deliverables include a PDF report documenting the methods, fixtures, and results tables; CSV / XLSX datasets containing plume and pattern metrics with replicate statistics; and annotated images with side-by-side overlays for internal review and submission appendices.

Standards & guidance

ARE Labs aligns spray pattern studies with the regulatory and consensus standards applicable to nasal sprays, oral sprays, and consumer aerosols. When a method falls within our third-party-accredited scope, it is documented as accredited under ISO 17025. When we follow a standard outside that accredited scope, the method is described as aligned or conformant where applicable. The cards below identify the standards most often used in SP / PG packages. Select a card to see how the standard applies to a study, which deliverables it informs, and which tests cite it.

Inhalation & Drug Delivery - Aligned

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Spray Pattern and Plume Geometry Testing