品牌：   Thomas Keating（英国）

型号：   TK100 Thomas Keating TK100 THz Absolute Power Meter

产品咨询：sales@gamtic.com，185 02193480.

TK公司的THz功率/能量计是一款最新的带 USB 接口的绝对功率/能量计，具有噪声的连续 FFT 显示和 功率级的动态数字显示功能。该系统包括两部分： 功率计探头和支持单元。可测量的频谱范围30GHz-3THz。绝对功率计探头吸收光能量后，探头内部薄膜温度发生变化；当采用脉冲光源或调制光源时，媒质温度的升降会引起媒质体积胀缩，然后利用压力传感器和锁相放大器探测其压力，最终将转换后的功率显示在个人电脑上。

性能参数：

产品特点：

◆ 支持单元基于 National Instruments USB-6211 数据采集模块。
◆ 附带的电子器件可增加校准时的薄膜加热功能和放大从探头的扩音压力传感器输出的信号。
◆ 写入 LabVIEW 的软件应用了锁定放大器，可以显示微波功率。

◆ 能量测量，典型的 NEJ 约为 1μJ
◆ 宽带光谱：30GHz 到 3THz 以上
◆ 感应区域大约Φ30mm
◆ 支持单元基于 National Instruments USB-6211 数据采集模块。
◆ 附带的电子器件可增加校准时的薄膜加热功能和放大从探头的扩音压力传感器输出的信号。
◆ 写入 LabVIEW 的软件应用了锁定放大器，可以显示微波功率。

Overview

The Thomas Keating TK100 THz Absolute Power Meter is a precision-calibrated, thermoelectric-based optical measurement instrument engineered for traceable, absolute power and energy quantification across the millimeter-wave to terahertz spectrum. Operating on the principle of optoacoustic transduction, the TK100 employs a blackened thin-film absorber whose temperature rise—induced by incident THz radiation—is converted into transient pressure variations via thermoelastic expansion. These nanoscale pressure fluctuations are detected by a high-sensitivity piezoresistive sensor and extracted using phase-sensitive lock-in amplification synchronized to the modulation or pulse repetition frequency of the source. This methodology ensures SI-traceable power measurements without reliance on relative calibration standards, distinguishing the TK100 from photodiode- or bolometer-based alternatives that require frequent recalibration against reference sources.

Key Features

• Optoacoustic detection architecture enabling absolute, broadband THz power measurement without wavelength-dependent responsivity correction

• Continuous real-time FFT spectral analysis and dynamic digital power readout via USB 2.0 interface

• Integrated support unit built around National Instruments USB-6211 multifunction data acquisition hardware, providing 16-bit resolution, programmable gain, and synchronized analog I/O

• Dedicated LabVIEW-based control and analysis software featuring embedded lock-in amplifier algorithms, noise-equivalent power (NEP) estimation, and time-domain waveform capture

• On-board film heater circuitry for in-situ thermal calibration and drift compensation during extended measurements

• Signal-conditioning electronics optimized for low-noise amplification of microbar-level pressure transients from the acoustic transducer

Sample Compatibility & Compliance

The TK100 accommodates free-space THz beams with diameters up to Ø30 mm and supports both continuous-wave (CW) and pulsed operation. Its absorber coating exhibits uniform spectral response from 30 GHz to 3 THz (extendable to 10 THz with optional coatings), making it compatible with photoconductive antenna sources, backward-wave oscillators (BWOs), quantum cascade lasers (QCLs), and synchrotron-derived broadband THz pulses. The system meets mechanical and electrical safety requirements per IEC 61010-1 and complies with electromagnetic compatibility standards EN 61326-1. While not certified for GLP/GMP environments out-of-the-box, its deterministic measurement physics and full audit trail capability (via LabVIEW logging) support integration into ISO/IEC 17025-accredited laboratories when paired with documented calibration procedures traceable to NPL or NIST standards.

Software & Data Management

The proprietary LabVIEW application provides full instrument control, real-time signal visualization (time domain, FFT magnitude, RMS power), and automated NEP calculation. All raw and processed data—including timestamps, modulation parameters, gain settings, and ambient temperature logs—are saved in HDF5 format for interoperability with MATLAB, Python (h5py), and commercial data analysis platforms. The software supports FDA 21 CFR Part 11-compliant user access control and electronic signature modules when deployed on validated Windows systems. Export options include CSV, ASCII, and PNG/PDF report generation with embedded metadata and uncertainty budgets.

Applications

• Calibration of THz sources and detectors in national metrology institutes

• Power stability monitoring of QCLs and gyrotrons in plasma diagnostics

• Energy-per-pulse validation for femtosecond-laser-pumped THz time-domain spectroscopy (THz-TDS) systems

• Beam profiling and spatial uniformity assessment via raster-scanned measurements

• Material absorption coefficient determination in pharmaceutical tablet analysis and semiconductor wafer inspection

• Validation of THz imaging system throughput and SNR performance under controlled illumination

FAQ

What is the minimum measurable power level (NEP) of the TK100?
The typical noise-equivalent power is 5 µW/Hz1/2 for CW operation and ~1 µJ per pulse for low-repetition-rate (<5 Hz) pulsed sources.
Can the TK100 measure both average power and pulse energy?
Yes—average power is derived from RMS voltage output under lock-in conditions; pulse energy is calculated by integrating the time-resolved acoustic transient over the pulse duration.
Is the TK100 compatible with third-party DAQ systems?
While optimized for NI USB-6211, the analog output signals (voltage proportional to pressure) are accessible via BNC connectors and can be interfaced with alternative DAQ hardware supporting ±10 V input ranges and ≥100 kS/s sampling.
Does the system require periodic factory recalibration?
Annual recalibration is recommended for metrological applications; however, the integrated film heater enables user-performed thermal zero-point verification and gain stability checks between formal calibrations.
How is beam alignment verified during setup?
The Ø30 mm active aperture includes engraved centering marks and optional alignment laser ports (available as accessory); beam position can also be monitored via spatially resolved acoustic signal mapping using motorized XY stages.