Description
ASD FieldSpec4 Spectroradiometer Repair
The FieldSpec 4 is the portable spectroradiometer a great deal of ground-truth remote sensing work is built on, covering 350 to 2,500 nm across three detectors: a silicon photodiode array for 350 to 1,000 nm, an InGaAs photodiode for 1,001 to 1,800 nm, and a second InGaAs for 1,801 to 2,500 nm, at roughly 3 nm VNIR and 6 to 8 nm SWIR resolution depending on model. Those two detector boundaries are exactly where splice artifacts appear when something drifts. Its results calibrate and validate airborne and satellite data, so instrument health is not a convenience question: a drifting spectroradiometer quietly corrupts every dataset it touches.
June Company’s certified technicians repair the FieldSpec 4 for remote sensing researchers, earth observation teams, agricultural scientists, and calibration and validation groups. We diagnose and repair at the board and component level, and every instrument is functionally verified against known reference standards before it ships back.
Common FieldSpec 4 problems we fix
- SWIR detector cooling and performance faults — rising noise in the shortwave infrared, which is where this instrument is most often found wanting.
- VNIR detector faults — noise or sensitivity loss across the visible and near-infrared region.
- Fiber-optic cable and connector faults — broken or crushed fibers, and end faces damaged enough to lose most of the light.
- Detector step and splice artifacts — discontinuities appearing at the detector transitions where the spectrum should join smoothly.
- Optical alignment drift — throughput falling away after a drop or a shock, with peak positions no longer landing where the library expects.
- Radiometric calibration drift — measured radiance no longer agreeing with reference standards.
- Battery, charging and power faults — shortened runtime, or shutdowns partway through a shift.
- USB, Wi-Fi and Bluetooth communication faults — results not transferring to the host software, or the instrument not being recognized at all.
- Housing, seal and ruggedization damage — cracked enclosures and failed gaskets after a drop, which let dust and moisture inside the instrument.
- Foreoptic and accessory faults — contact probes, pistol grips and foreoptics not performing to specification.
FAQs
We see a step at the detector transition. Is that repairable? Usually yes. Splice artifacts normally trace to detector performance or calibration rather than to anything structural, and they are correctable.
The fiber bundle has been crushed. Is that economical to fix? Often, yes — fiber repair is routine work and far cheaper than replacing the instrument. We assess and quote before proceeding.
Our data feeds satellite validation. What documentation do we get? You receive the verification results against reference standards with the instrument, which is what you need for your data records.
Every repair is backed by a 90-day parts-and-labor warranty, with a firm quote before any work begins. Email us or submit a service request.






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