Spectrometer
SCP is a LED based 12 channels emission and 16 channels detection optical spectrometer plus a visible band photodiode. LEDs are used both as light sources and wavelength selective photodetectors and can be driven with up to 200mA for high optical output power. Any one LED can be used for light emission and any other LED or photodiode can be used for measurement. Light emission and measurement can be performed with a lock-in amplifier modulation at a user programmable frequency, both the in-phase and quadrature components can be acquired. Use of the lock-in technique helps reducing interference from environmental light to the measurement.
Light fluorescence can be observed by exciting the target with one LED and measuring fluorescent spectral components with the other sensor LED. By modulating the exciting LED at programmatic frequencies with the lock-in technique, the measured quadrature component is related to time shifts of the excitation, allowing to perform time resolved spectroscopies.
Specifications
| ELECTRICAL | |
| Supply Voltage | 1.5-3.6V |
| Max Current | 0.4mA continuous when reading on-chip sensors with EIS |
| Size | 12x15mm, 3mm thickness |
| Interface | I2C or SENSIBUS, single data wire multidrop sensor array cable interface, 1.5-3.6V |
| Unique Identifier | OTP 48bits Unique Device Identifier, 16bits User Defined |
| ELECTRICAL IMPEDANCE SPECTROSCOPY | |
| Frequency | 3.1mHz to 1.2MHz |
| Vpp output sinewave | 156mV to 2.8Vpp |
| Coherent demodulation | 1st, 2nd or 3rd harmonic |
| Output | Reciprocal of real or imagery component |
| Wide Measurement Range | From ohms to 100MΩ |
| TEMPERATURE | |
| Range | -40°C to 125°C |
| Accuracy | ±0.1°C |
| Thermodynamics | calorimetry, enthalpy, exo/endothermic |
| ELECTROCHEMICAL METHODS | |
| pH | From 3 to 14, potential of Platinum vs Clads-Platinum |
| ORP | total oxidation and reduction potentials |
| RedOx | reduction/oxidation activity (free chlorine, hardness) |
| Voltammetry | specific reduction or oxidation potentials |
| Anodic Stripping Voltammetry | measures heavy metals |
| Electro-catalysis | Noble metal IDEs measure current specifically |
| IMPEDANCE METHODS | |
| Conductivity spectroscopy | resistivity, salinity, EC, TDS, absorption dynamics |
| Dielectric spectroscopy | turbidity, SS, biomass total/active, hydrocarbons detection |
Measurements
Open Data
The following data is made available to data scientists, AI developers and it is free to use. The datasets have been acquired with the SCW water sensor and the SLM-Studio software, these are the same data we use to train our own machine learning models.
Please, feel free to share results of your investigation with us.
Applications
- Food analysis
- Plants health
- Pharmacy and Cosmetics
- Water contaminants
- Liquid, solid material analysis
- Biophotonics
- Content determination
- Chemometrics
