LDDM Technology vs. Michelson Interferometer Technology
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LDDM Technology vs. Michelson Interferometer Technology LDDM technology Michelson interferometer LDDM Advantage ? Higher performance, (Single frequency) ? Lower cost 1. Latest Electro Optics & Radio Frequency technology with many patents Interferometer technology 2. 2-frequency, FM & heterodyne Single-frequency, AM & homodyne ? Higher Signal to Noise Ratio (consider FM Radio versus AM Radio) ? Higher signal quality ? Less interference 3. Frequency locked Frequency locked ? Frequency stable 4. Single aperture Dual-aperture ? Smaller retroreflector capability ? Flat-mirror target capability ? Larger beam diameter possible ? Fewer Optical Components 4a. Small laser head Large laser head ? Compact ? Easily mount on machine ? No need for a tripod ? Smaller carrying case 4b. Small retroreflector Large retroreflector ? Reduces the size of all optical components ? More compact 5. 2 elements to align 3 elements to align ? Easy Faster setup and alignment ? Fewer Separate Optical Components ? More efficiency ? Less training 6. Low laser output power High laser output power ? Eye Safe 7. Long range, up to 100 m Short range ? Long range without increasing laser power 8. Fast, 5 m/sec Slow, 1 m/sec ? Good for high speed linear motor machine 9. Digital electronics ? ? Large Dynamic Range 1 >

Major Features and Comparison 1. Why LDDM is better? The performance is higher and more flexible. The system is more efficient and accurate, easier to setup and operation, more compact and lower cost. What are the benefits? Higher performance with lower cost. Very good return on investment (ROI). 2. Why LDDM is more compact? The laser head is single aperture and a small retroreflector is used as target. Hence all of the optical components are smaller. The laser head can be mounted directly on the machine and there is no need for a heavy tripod. What are the benefits? The laser head can be...

What are the benefits? One LDDM for all the machines, save on capital expenses. 7. Why LDDM is more accurate? The laser frequency is frequency locked and the laser accuracy is traceable to NIST. Because of the 2-frequency, FM, single-aperture and large beam diameter, it is less sensitive to environment interference. Hence it is more accurate in the shop environment. What are the benefits? Meet the ASME B5.54 and ISO 230 standards, and traceable to NIST. 8. Why LDDM is Affordable? It uses the latest technology such as Electro-Optic, Radio Frequency and digital electronics and with many...

Why LDDM has more capabilities? Since the laser head is single aperture, either a small retroreflector, a flat-mirror, or any specula reflecting surface can be used as target. Hence it has more capabilities. What are the benefits? It can measure the static volumetric positioning errors, dynamic contouring errors, and spindle error motion. One instrument for all the measurement, saves on capital expenses. > LDDMvsInterfR.doc 12/17/2002 4 13. >