Shanghai Jiepu Technology, with its ultraviolet absorption method, features high sensitivity and is capable of measuring pollutants in water or flue gas. The equipment integrates imported pulsed xenon lamps, ensuring high stability and a continuous service life of over five years, with excellent light source stability.

Ultraviolet absorption measurement system

1、Adopting advanced spectral measurement technology, it enables rapid measurement of ultraviolet transmittance and absorbance.

2、 The light source is composed of highly stable flashing xenon lamps, providing a wide-spectrum light source ranging from 200 to 2500nm with excellent stability. The spectral detector is imported from Hamamatsu, Japan, featuring high precision and low noise, with 2048 optical channels, enabling more precise optical measurements.

3、DDOS Ultraviolet Differential Method for Measuring Water Quality and Pollutant Detection in Flue Gas

4、 Professional testing software can be used to set, store and print list data according to actual operational requirements.

5、 The software is equipped with a powerful measurement, analysis and management program, the measurement scheme can be customized according to customer requirements.

It complies with the measurement standards and norms both at home and abroad

• High resolution, with the minimum resolution of 0. 2nm (depending on the wavelength range).

• High sensitivity in the UV and VIS bands

• USB, RS232, TTL, 485, Modbus connection interfaces

• Signal-to-noise ratio: 800:1  *snr=(Signal-Noise)/Devication

• Dynamic range: 2000:1  **DR=(saturation/Dark)

• Ultra-low stray light

• Multiple working modes including external trigger, auto exposure and software-controlled exposure.

• Integral time: 8 milliseconds to 65 seconds

• Built-in xenon lamp control circuit

• Supports SDK and is easy to integrate into your system.

Data acquisition control software

Spectrum Factory is a professional spectral processing software.

Software support

1、Transmission and reflection mode, the transmission and reflection rate of glass or transparent objects

2、Raman mode, which can be combined with a laser to measure Raman spectra.

3、 Concentration mode, which can be combined with xenon lamps, measures the absorbance at ultraviolet wavelengths, thereby determining the liquid concentration according to Lambert-Beer's Law.

4、Fully automatic motor platform control, supporting single-axis motor, dual-axis motor, three-axis motor, microscope motor, auto-focusing, and camera support. The head supports score display and motion control, such as arc collection and S-shaped acceleration and deceleration.

5、 X-axis timing measurement mode, which can be used in conjunction with mercury-argon lamps to test the stability of the X-axis.

6、Y-axis time sequence measurement mode, which can be combined with the laser to test the stability of the laser's central wavelength.

7、Microscopic mode, which can be combined with the motorized stage, is capable of capturing hyperspectral images, supporting both transmission and reflection hyperspectral imaging, as well as Raman hyperspectral imaging.

8、 LIBS mode can be combined with a 1064 Nd-YAG laser to measure the composition of metals.

9、 Film thickness measurement, capable of measuring the thickness of films ranging from 5um to 100um.

10、Spectrophotometric color measurement can be used to measure parameters such as XYZ, Lab, Yxy, HSV, LCH, and RGB.

11、Online measurement, allowing remote control of the spectrometer's measurement data.

12、Uniformity measurement can test the distribution uniformity of samples, including the uniformity of drug particles or the uniformity of LED light.

Superior stability

As an industrial-grade spectrometer, stability is the most important technical indicator. The overall stability of the instrument is composed of the stability of the spectrometer and the stability of the light source.

Spectral instrument stability

The intensity stability of the spectrometer is over 99.99%.

The wavelength accuracy of the spectrometer is ± 0. 5nm.

Wavelength temperature stability 

wavelength repeatability of the spectrometer.

The stability of halogen lamps is over 99.9%.

Stability test diagram of the complete machine

 It features excellent stability. After 15 minutes of preheating, the stability of the halogen lamp is over 99.9%, and the overall stability of the machine is greater than 99% (as measured over 8 hours).

OEM

Ultraviolet Absorption OEM Module

• With fiber optic spectrometer + pulsed xenon lamp

• The fiber optic spectrometer is equipped with a built-in xenon lamp control module and does not require an external module.

• The fiber optic spectrometer is equipped with a built-in computing module, which can directly output the ABS absorbance value without the need for calculation by an upper computer

Principle of Transmittance Measurement 

Concentration calculation

Testing process

1.Turn off the light source and collect the electronic noise of the spectral acquisition equipment.

2. Turn on the light source, set the exposure time to 100 ms, and collect the reference spectrum.

3. Place the test object, collect its spectral data, with the X-axis representing the spectrum.

The X-axis represents wavelength, and the Y-axis represents the transmittance corresponding to the wavelength.

Absorbance = Log10(T)

The mathematical expression of Beer-Lambert Law

A = -log₁ ₀ (T transmittance) = Kbc

A is absorbance, and T is transmittance, which is the ratio of the intensity of the transmitted light (I) to that of the incident light (I0).

K is the molar absorptivity. It is related to the nature of the absorbing substance and the wavelength λ of the incident light.

c represents the concentration of the absorbing substance, with the unit of mol/L, and b represents the thickness of the absorption layer, with the unit of cm. [b is also often replaced by L, with the same meaning]

Example of Quantitative Analysis

The quantitative analysis of oil in water can be conducted in accordance with the national standard method. By means of ultraviolet absorption, the concentration of oil in water can be measured.

As can be seen from the graph, the oil content shows a completely linear distribution at 260nm